Taxonomic revision of thorny catfish genus Hassar (Siluriformes: Doradidae) Author Birindelli, José L. O. Author Fayal, Danielle F. Author Wosiacki, Wolmar B. text Neotropical Ichthyology 2011 2011-12-31 9 3 515 542 http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252011000300006&lng=en&tlng=en journal article 10.1590/S1679-62252011000300006 1982-0224 5422996 Hassar wilderi Kindle, 1895 Fig. 16 Hassar wilderi Kindle, 1895: 251 [type locality: Trocera on Tocantins [=likely rio Tocantins at Trocará Indigenous territory, c. 20 km downstream from Tucuruí, Tucuruí, PA, Brazil ].— Kindle, 1893: 72 [name appeared as a nomen nudum ].— Eigenmann, 1925: 355 , pl. 22, fig.2 [identification key, illustration].— Gosline, 1945: 23 [literature compilation].— Fowler, 1951: 492 [literature compilation].— Myers & Weitzman, 1956 [ Lectotype designation].— Santos et al. , 1984: 51 [identification key, description, Tucuruí reservoir].— Burgess, 1989: 222 [literature compilation].— Eschmeyer, 1998: 1792 [literature compilation].—Sabaj & Ferraris, 2003: 461 [literature compilation].— Ferraris, 2007: 171 [literature compilation].— Birindelli et al ., 2009: 276 [gas bladder morphology].— Mérona et al ., 2010: 53 [ecology]. Hassar iheringi Fowler, 1941a: 140 [ type locality: Rio Parnahyba, Therezina, Piauhy (=rio Parnaíba, Terezina, PI, Brazil , probably a wrong locality, see Remarks)].— Gosline, 1945: 23 [literature compilation].— Fowler, 1951: 491 [literature compilation].— Burgess, 1989: 218 [literature compilation].— Eschmeyer, 1998: 760 [literature compilation]. Type-specimens. ANSP 69393 ( 1, 135.6 mm SL, holotype of Hassar iheringi ); ANSP 69394-69395 (2, 116.8-144.0 mm SL, paratypes of Hassar iheringi ); rio Parnaíba, Teresina, PI, 1936, R. von Ihering [probably a wrong locality, see Remarks]. SU 2243 ( 1, 157.7 mm SL, lectotype of Hassar wilderi , ex. CU 1704); CAS 60710 ( 1, 181.2 mm SL, paralectotype of Hassar wilderi , ex. CU 1705); CAS 60711 ( 1, 139.5 mm SL, paralectotype of Hassar wilderi , ex. CU 1703); Trocera on Tocantins (=likely rio Tocantins at Trocará Indigenous territory, c. 20 km downstream from Tucuruí, Tucuruí, PA, Brazil ), 1870-1876, F. C. Hartt. Non-type specimens. Tocantins basin ( Brazil ) : ANSP 178700 ( 1, 152.7 mm SL), Araguaia basin, c . 13°14’S 50°35’W , Luis Alves, GO , Apr 1994 , F. L. T. Garro. INPA 20109 ( 1, 178.9 mm SL), lago Volta Grande , Caseara, TO , May 2000 . MPEG 1027 ( 1, 126.9 mm SL), Aragarças , GO, Jan 1958 , Hidasi . MZUSP 4857 (1 c&s, 101.0 mm SL), rio Araguaia , c . 14°55’S 51°5’W , Aruanã, GO , Sep 1966 , Excursão do Departamento de Zoologia [ H. A. Britski et al ] . MZUSP 46016 (2, 65.8-83.3 mm SL), Araguaia basin, c . 14°55’S 51°5’W , Aruanã, GO . MZUSP 49177 ( 1, 105.2 mm SL), Araguaia basin, c . 10°35’S 50°34’W , Santa Terezinha , MT, Oct 1964 , H. A. Britski. MZUSP 49178 ( 1, 169.9 mm SL), rio Tocantins , c . 3°46’S 49°41’W , Tucuruí, PA . MZUSP 49180 (3, 136.5-150.0 mm SL), lago Dumbá Grande , Araguaia basin, MT, 1976 . MZUSP 49182 ( 1, 147.9 mm SL), rio Tocantins , Barra de Tapirapé , MT . MZUSP 49185 (2, 116.9- 135.7 mm SL), rio Tocantins , c . 2°50’S 49°40’W , Baião, PA , Sep 1970 . MZUSP 49186 (3, 112.2- 152.2 mm SL), Araguaia basin, c . 14°55’S 51°5’W , Aruanã, GO . MZUSP 52315 (2, 157.6- 173.1 mm SL), Araguaia basin, c . 14°55’S 51°5’W , Aruanã, GO . MZUSP 52336 (4, 172.0- 185.6 mm SL), Araguaia basin, Cocalinho , MT . MZUSP 52432 ( 1, 178.2 mm SL), Araguaia basin, c . 14°55’S 51°5’W , Aruanã, GO . MZUSP 52359 ( 1, 183.4 mm SL), beach between Bandeirantes and Luis Alves , c . 13°40’S 50°48’W , Luis Alves, GO , Jul 1997 . MZUSP 52394 (4, 161.0- 188.4 mm SL), Bandeirantes , MT . MZUSP 52408 ( 1, 165.8 mm SL), Itaiacú , MT . MZUSP 52418 (1, 71.3 mm SL), between Araguaiana and Itaiacú , MT . MZUSP 53817 (2, 130.5- 137.6 mm SL), near Aldeia Fontora , MT . MZUSP 53819 (6, 97.6-116 mm SL), lago da Pedra , MT . MZUSP 53825 (6, 83.7-166.2 mm SL), lago das Branquinhas , MT, Feb 1998 . MZUSP 53835 ( 1, 159.6 mm SL), Araguaiana , MT . MZUSP 54194 (1, 85.6 mm SL), rio Cristalino , MT . MZUSP 54284 (2, 101.6- 123.8 mm SL), between Araguaiana and Itaiacú , MT . MZUSP 54296 (2, 99.5 mm SL), Araguaia basin, São Félix do Araguaia , MT, Nov 1997 . MZUSP 54451 (1 sk, not measured), rio Cristalino , MT, Oct 1997 , Coleção rio Araguaia . MZUSP 61987 ( 1, 111.2 mm SL), rio Tocatins , c . 3°42’S 49°27’W , Tucuruí, PA . MZUSP 62794 (4, 76.9-90.8 mm SL), Araguaia basin, c . 14°22’S 51°0’W , Cocalinho , MT, Jun 1997 , W. Severi et al. MZUSP 62998 (5, 141- 165.7 mm SL), Araguaia basin, Barra do Garças , 15°52’3”S 51°58’17”W , Ouro Fino , MT . MZUSP 63020 (4, 83.4-164.2 mm SL), Araguaiana , near mouth rio das Mortes ( Pontal ), MT . MZUSP 63148 (2, 152.4- 154.3 mm SL), rio das Mortes , Capitariguara , 14°30’22”S 51°52’29”W , Nova Xavantina , MT . MZUSP 84205 ( 1, 157 mm SL), rio Tocantins , Tucuruí, PA . MZUSP 86216 (7, 72.4-157 mm SL), Araguaia basin, Cocalinho , 14°17’20”S 51°9’12”W , MT . MZUSP 86782 (7, 142.2-162.0 mm SL), Araguaia basin, Cocalinho , 14°24’11”S 50°59’27”W , MT, Oct 2004 , J. L. Birindelli et al . MZUSP 89187 (10, 128.9- 165.7 mm SL), Araguaia basin, 14°25’33”S 50°59’40”W , Cocalinho , MT, Jul 2005 , C. Chamon et al . MZUSP 89620 (3, 113.8- 127.2 mm SL), rio Verde , 13°9’28”S 50°30’22”W , Luís Alves, GO , Apr 2004 , A.Akama. UMMZ 203401 ( 1, 138.6 mm SL), Baiaom , PA, Jul 1935 , H. W. Curran. Diagnosis. Hassar wilderi is distinguished from H. orestis by having 9 th through 14 th , modally 12 th , midlateral scute as the anteriormost with median thorn ( vs. 1 st through 8 th , modally 3 rd ), and tip of upper caudal-fin lobe rarely darkened ( vs. usually darkened). Hassar wilderi is distinguished from H. affinis and H. gabiru by having gas bladder with many well-branched diverticula on margins of the entire bladder ( vs. gas bladder with two rounded or weakly-branched diverticula restricted to each side of anterior chamber of the gas bladder [rarely one extra pair on the posterior chambers]), and gas bladder triangular posteriorly, each posterior chamber extended into a short terminal diverticulum sharing medial septum with its pair ( vs. gas bladder posteriorly rounded, lacking terminal diverticula) ( Fig. 4 ). Hassar wilderi is further distinguished from Hassar affinis by having the first branched dorsal-fin rays and membranes pale ( vs. first branched dorsal-fin rays and membranes distally darkened). Description. Morphometric data are summarized in Tables 3 and 4 ; morphometric data for type specimens in Table 4 ; type and non-type specimens illustrated in Fig. 16 . Largest specimen examined 188.4 mm SL (MZUSP 52394). Dorsal profile of head rising moderately, evenly (usually in smaller specimens) or slightly convex (especially in larger specimens) from snout tip to anterior margin of orbit, and relatively straight from that point to the dorsal-fin spine. Dorsal profile of body descending gradually, approximately straight from dorsal-fin spine to caudal peduncle. Ventral contour shallowly concave from snout tip to pectoral girdle, and slightly convex from that point to caudal peduncle. Caudal peduncle short with shallow hourglass shape in lateral view. Table 1. Morphometric data for non-type specimens of the Hassar affinis and H. gabiru . SD = standard deviation.

Hassar affinis		Hassar gabiru
N	Range	Mean	SD	N	Range	Mean	SD
Standard length (SL)	52	74.8-197.6	13	81.85-156.6
Percent of standard length
Head length (HL)	52	31.29-37.09	33.11	1.30	13	29.89-43.17	32.56	3.31
Predorsal distance (PdD)	52	38.85-47.35	42.35	1.72	13	40.19-56.02	43.12	3.98
Prepectoral distance (PpD)	52	27.12-33.44	29.66	1.49	13	28.04-36.91	29.50	2.33
Prepelvic distance	52	52.92-59.31	55.92	1.48	13	54.91-57.60	56.38	0.85
Preanal distance	52	72.01-77.86	74.78	1.27	13	16.04-96.17	78.84	5.32
Body depth at dorsal-fin origin (BD)	52	20.32-25.94	23.88	1.45	13	24.26-33.13	25.78	2.30
Body depth at 10th scute (BD10)	47	16.60-21.60	19.12	1.36	13	17.39-24.33	19.13	1.72
Body depth at anal-fin origin	52	13.34-18.17	16.09	1.16	13	15.93-20.66	17.31	1.27
Dorsal-fin spine length (DSL)	45	24.09-32.99	28.82	2.21	13	23.80-30.46	26.25	1.71
Dorsal-fin lobe length	39	23.16-30.44	26.80	2.09	12	24.65-31.35	27.24	1.78
Dorsal-fin base length	52	12.44-15.18	13.80	0.72	13	12.56-20.28	24.08	2.05
Distance from dorsal-fin origin to adipose-fin terminus (DOAD)	52	43.36-49.58	46.74	1.48	11	46.63-51.90	49.42	1.83
Adipose-fin base length (AdFB)	52	6.62-11.53	9.62	1.11	13	9.09-11.79	10.17	0.89
Distance from adipose-fin terminus to caudal-fin origin (AdCD)	52	15.20-19.06	16.91	0.78	13	12.99-15.84	14.81	0.74
Pectoral-fin spine length (PSL)	47	17.16-29.33	25.54	2.31	13	18.44-34.16	26.85	4.14
Distance from pectoral-fin origin to pelvic-fin origin (PPD)	52	18.93-28.90	25.78	1.81	13	23.12-34.93	28.38	2.68
Pelvic-fin lobe length (PFL)	46	10.42-18.01	16.06	1.23	13	16.09-19.19	17.56	0.9
Distance from pelvic-fin origin to adipose-fin origin (PAD)	52	17.30-22.12	19.78	1.46	13	13.01-26.12	22.21	3.55
Anal-fin base length (AnFB)	52	9.95-14.10	11.58	0.80	13	10.66-12.82	11.54	0.71
Distance from anal-fin terminus to caudal-fin origin (AnCD)	52	14.12-17.58	15.78	0.77	13	11.64-15.27	13.32	0.96
Caudal-peduncle depth (CPD)	52	6.09-7.78	7.03	0.35	13	6.55-8.63	7.07	0.56
Percent of body depth at 10th midlateral scute
Depth of 10th scute (PD10)	11	3.08-5.11	4.11	0.72	13	4.63-8.99	6.12	1.23
Percent of head length
Body width at opercle (BWO)	52	44.27-54.64	49.71	2.42	13	48.11-56.58	53.71	2.54
Body width at nuchal shield (BWNP)	52	24.27-31.11	27.17	1.70	13	25.28-27.28	26.24	0.64
Body wigth at cleithrum (CW)	52	55.59-70.63	63.24	2.86	13	61.62-69.79	67.10	2.66
Adipose-eye diameter (AED)	52	24.00-39.13	30.41	2.53	13	24.37-33.39	29.75	2.39
Eye diameter (ED)	52	19.72-29.14	25.27	2.38	13	18.86-27.00	24.02	2.33
Snout length (SnL)	52	43.12-53.61	50.42	2.70	13	49.43-58.88	53.37	2.69
Distance from snout to anterior nare (SAND)	52	21.01-29.17	25.83	1.81	13	21.56-27.04	24.58	1.60
Distance from snout to posterior nare (SPND)	52	35.42-41.07	38.36	1.14	13	34.65-39.42	37.93	1.52
Distance from snout to terminus of adipose eye (SPOD)	52	73.18-83.33	78.85	2.16	13	77.75-83.27	81.02	1.81
Distance from terminus of adipose eye to terminus of nuchal shield (PL)	52	49.44-59.76	54.76	2.37	13	52.51-61.54	56.31	2.59
Distance from anterior nares to terminus of adipose eye (ANPOD)	52	48.46-58.70	52.53	1.74	13	54.48-60.74	56.04	1.58
Distance from posterior nares to terminus of adipose eye (PNPOD)	52	35.70-46.38	40.65	1.88	13	42.09-45.80	43.28	1.01
Interorbital width (IW)	52	12.58-25.17	19.77	2.42	13	17.31-22.98	19.58	1.47
Length of posterior cleithrum process (PcPL)	52	32.76-43.60	39.02	2.57	13	36.14-43.78	39.56	2.05
Depth of posterior cleithrum process (PcPD)	52	14.52-21.15	17.30	1.42	13	17.46-20.59	19.24	1.12
Horizontal length of nuchal foramina	49	4.31-9.86	6.41	1.14	13	4.80-7.84	6.25	0.98

Body elongate with prominent conical snout. Mouth subterminal, each premaxilla bearing small patch of approximately 5 to 10 acicular teeth, and each dentary with approximately 10 to 20 acicular teeth. Oval orbit with weakly developed adipose eyelid in juveniles (SL < 14 cm ), extended slightly beyond anterior and posterior limits of eye, and moderately developed in adults (SL> 14 cm ), extended slightly further anteriorly than in juveniles. Eyes positioned about half way between tip of snout and dorsal-fin origin. Three pairs of barbels (maxillary, inner and outer mental), all fimbriate. Maxillary barbel usually reaching base of first pectoralfin ray; with 8 to 13 (mode 10, n=66) fimbriae along ventrolateral face. Inner and outer mentonian barbels of approximately equal size, covered with many rounded papillae, and falling short of ventralmost opening of gill slit. Gill rakers small on first gill arch, absent on remaining arches. Accessory branchial lamellae on inner face of first gill arch well developed in approximately ten rows from insertion of rakers to origin of branchial filaments (but not contacting the latter); accessory lamellae gradually reduced on remaining (second to fifth) gill arches. Lateral-line tubules ossified, forming row of 31 to 34 (mode 32, n=60) midlateral scutes beginning with infranuchal. Three tympanal scutes, inconspicuous, usually without emergent thorn. Infranuchal scute with dorsal wing extremely thin and ventral wing dilated, expanded anteriorly, connected to posterior cleithral process; scute usually without medial thorn. Postinfranuchal scutes reduced anteriorly, non-overlapping; each with posterior margin bicuspid (without medial thorn) or tricuspid (including medial thorn), latter condition usually starting at 12 th scute (range 9 th through 14 th , n=60); medial thorn and dorsal and ventral wings gradually increasing in size posteriorly; scutes with serrated posterior margin and overlapping on last third of body. Table 2. Morphometric data for type specimens of the Hassar affinis and H. gabiru . SD = standard deviation.

Hassar affinis		Hassar gabiru
Hassar affinis	Hassar woodi
Holotype	Holotype	Holotype
NMW 45394	ANSP 69392	MZUSP 108440
Standard length (SL) (mm)	123.0	201.6	130.4
Percent of standard length
Head length (HL)	30.70	32.44	32.99
Predorsal distance (PdD)	39.55	42.36	42.70
Prepectoral distance (PpD)	28.90	29.76	28.31
Prepelvic distance	54.31	55.95	55.74
Preanal distance	75.98	76.19	77.29
Body depth at dorsal-fin origin (BD)	21.05	23.12	24.85
th Body depth at 10 scute (BD10)	18.29	18.40	18.24
Body depth at anal-fin origin	15.46	15.48	16.23
Dorsal-fin spine length (DSL)	26.62
Dorsal-fin lobe length	25.36	27.02
Dorsal-fin base length	12.00	13.05	13.83
Distance from dorsal-fin origin to adipose-fin terminus (DOAD)	49.51	45.54	48.87
Adipose-fin base length (AdFB)	8.70	9.82	11.79
Distance from adipose-fin terminus to caudal-fin origin (AdCD)	15.88	16.77	14.95
Pectoral-fin spine length (PSL)	22.77	29.10
Distance from pectoral-fin origin to pelvic-fin origin (PPD)	26.31	26.09	28.41
Pelvic-fin lobe length (PFL)	13.53	13.69	17.99
Distance from pelvic-fin origin to adipose-fin origin (PAD)	21.58	21.58	22.99
Anal-fin base length (AnFB)	12.23	11.41	11.17
Distance from anal-fin terminus to caudal-fin origin (AnCD)	13.64	15.53	14.01
Caudal-peduncle depth (CPD)	7.14	6.55	6.55
Percent of body depth at 10th midlateral scute
Depth of 10th scute (PD10)	4.66	5.10	6.73
Percent of head length
Body width at opercle (BWO)	48.17	54.53
Body width at nuchal shield (BWNP)	24.92	26.20
Body wigth at cleithrum (CW)	67.00	63.61	64.39
Adipose-eye diameter (AED)	33.78	24.31	30.29
Eye diameter (ED)	30.02	19.72	23.31
Snout length (SnL)	49.52	58.56	54.37
Distance from snout to anterior nare (SAND)	23.25	28.44	24.90
Distance from snout to posterior nare (SPND)	38.13	41.28	38.05
Distance from snout to terminus of adipose eye (SPOD)	81.53	81.04	80.24
Distance from terminus of adipose eye to terminus of nuchal shield (PL)	57.63	54.59	52.67
Distance from anterior nares to terminus of adipose eye (ANPOD)	57.34	52.45	54.70
Distance from posterior nares to terminus of adipose eye (PNPOD)	43.68	40.67	42.52
Interorbital width (IW)	20.02	24.16	19.80
Length of posterior cleithrum process (PcPL)	44.45	37.61	38.47
Depth of posterior cleithrum process (PcPD)	20.50	18.35	19.60
Horizontal length of nuchal foramina	7.31	6.76

Dorsal-fin II,6 (n=67), triangular with distal margin approximately straight, vertical when erected. Dorsal-fin spine slightly compressed and curved, with relatively small antrorse serrations along anterior margin (serrations reduced or absent on distal third); slightly larger retrorse serrations along posterior margin (serrations absent on proximal portion). Pectoral fin modally I,9, range I,7-9 (n=67); distal margin straight, oblique relative to body axis. Pectoral-fin spine slightly depressed and curved, with antrorse serrations along anterior margin (serrations absent on distal third); slightly larger retrorse serrations along posterior margin (serrations larger distally). Pelvic fin i,6 (n=66); distal margin rounded. Anal fin modally iii,7, range ii-v,6-9 (n=65); subtriangular with scarcely rounded distal margin. Adipose fin relatively small, teardrop-shaped, with rounded free posterior margin. Caudal fin i,7/8,i (n=67, rarely i,6/8,i or i,7/9,i), distinctly forked, with lobes approximately equal in size. Gas bladder ( Fig. 4 ) moderately large, cordiform. Bundles of diverticula present along the anterior, lateral, and posterior margins of the entire bladder in small specimens (< 50 mm SL); diverticula become thinner and more branched in larger specimens. Gas bladder triangular posteriorly, each posterior chamber extended into a short terminal diverticulum sharing medial septum with its pair and possessing smaller lateral diverticula. Osteology. Osteology generally similar to that described for Hassar orestis , excepting differences as follows. Total vertebrae 36 (n=1), vertebrae 6-14 bearing ribs. Eight (n=1) dorsal-fin pterygiophores, 11 (n=1) pelvic-fin pterygiophores; 11 (n=2) or 12 (n=3) dorsal and 10 (n=1), 11 (n=2) or 12 (n=2) ventral caudal-fin procurrent rays. All examined specimens with hypural fusion pattern PH ; HY 1+2; HY 3+4; HY 5, and with complete ossification of sutural joint at junction of sphenotic, parieto-supraoccipital and frontal. Table 3. Morphometric data for non-type specimens of the Hassar orestis and H. wilderi . SD = standard deviation.

Hassar orestis		Hassar wilderi
N	Range	Mean	SD	N	Range	Mean	SD
Standard length (SL)	101	43.9-246.8	67	65.8-188.4
Percent of standard length
Head length (HL)	101	29.95-42.67	34.04	2.30	67	30.36-37.13	33.20	1.32
Predorsal distance (PdD)	101	29.42-46.27	43.25	1.38	67	38.34-4650	42.84	1.60
Prepectoral distance (PpD)	101	25.05-32.22	30.32	1.26	67	24.62-35.03	30.03	1.48
Prepelvic distance	101	52.45-57.55	55.33	1.29	67	53.69-59.30	56.22	1.31
Preanal distance	101	70.62-77.10	74.73	1.43	67	71.94-81.60	75.63	1.51
Body depth at dorsal-fin origin (BD)	101	16.82-22.19	21.11	0.83	67	21.56-25.55	23.56	0.86
Body depth at 10th scute (BD10)	100	12.44-17.51	15.63	1.19	61	16.18-21.44	18.39	1.01
Body depth at anal-fin origin	101	9.97-14.68	13.14	0.93	65	13.00-17.90	15.22	0.86
Dorsal-fin spine length (DSL)	71	18.98-27.08	24.53	1.40	55	17.11-27.96	25.14	1.74
Dorsal-fin lobe length	95	15.28-25.81	22.15	1.74	63	20.05-28.08	23.88	1.80
Dorsal-fin base length	101	10.50-13.03	12.23	0.35	67	12.04-16.47	13.08	0.67
Distance from dorsal-fin origin to adipose-fin terminus (DOAD)	101	42.22-48.52	45.26	1.31	66	43.32-52.62	47.41	1.93
Adipose-fin base length (AdFB)	101	5.07-11.49	8.69	1.07	64	6.79-10.83	8.66	0.99
Distance from adipose-fin terminus to caudal-fin origin (AdCD)	101	12.94-18.01	16.51	0.81	66	14.25-18.75	16.04	0.83
Pectoral-fin spine length (PSL)	82	17.44-29.15	25.5	1.40	60	22.62-27.36	24.72	1.18
Distance from pectoral-fin origin to pelvic-fin origin (PPD)	101	22.25-26.88	24.74	0.95	67	23.93-29.00	26.13	1.16
Pelvic-fin lobe length (PFL)	88	11.16-16.08	14.25	0.78	63	12.10-17.49	15.43	1.09
Distance from pelvic-fin origin to adipose-fin origin (PAD)	101	17.05-21.29	19.58	1.03	67	16.49-23.03	20.31	1.31
Anal-fin base length (AnFB)	101	6.41-12.89	11.19	0.74	67	7.27-12.57	10.95	0.82
Distance from anal-fin terminus to caudal-fin origin (AnCD)	101	10.95-17.02	15.80	0.81	67	11.55-17.81	15.14	0.92
Caudal-peduncle depth (CPD)	101	4.25-6.44	5.50	0.44	67	5.73-7.68	6.52	0.37
th Percent of body depth at 10 midlateral scute
Depth of 10th scute (PD10)	87	6.15-18.00	12.85	2.73	56	3.24-8.15	5.30	1.14
Percent of head length
Body width at opercle (BWO)	101	33.56-51.70	45.25	2.82	67	45.06-54.94	48.67	2.14
Body width at nuchal shield (BWNP)	101	15.86-37.37	22.99	3.51	67	20.54-26.32	23.13	1.20
Body wigth at cleithrum (CW)	101	45.02-65.99	58.31	4.19	67	54.36-6858	61.10	2.85
Adipose-eye diameter (AED)	101	23.23-35.93	29.52	3.21	67	23.69-35.02	28.31	2.46
Eye diameter (ED)	101	15.03-35.83	24.74	4.90	67	18.47-30.88	23.34	2.77
Snout length (SnL)	91	38.38-60.07	52.23	5.64	67	47.47-60.40	54.98	2.79
Distance from snout to anterior nare (SAND)	91	18.86-30.99	26.49	3.23	67	22.38-32.38	27.45	1.90
Distance from snout to posterior nare (SPND)	101	25.24-45.07	34.57	7.34	67	35,02-42.16	39.02	1.55
Distance from snout to terminus of adipose eye (SPOD)	91	59.93-85.11	79.99	6.33	67	77.17-84.12	81.00	1.44
Distance from terminus of adipose eye to terminus of nuchal shield (PL)	91	42.75-60.96	51.06	4.50	67	48.78-60.08	53.32	2.53
Distance from anterior nares to terminus of adipose eye (ANPOD)	101	40.40-59.36	52.81	3.54	67	49.91-58.40	53.16	1.82
Distance from posterior nares to terminus of adipose eye (PNPOD)	100	30.30-44.39	39.36	2.78	67	38.59-47.95	42.29	1.50
Interorbital width (IW)	101	11.87-19.05	15.28	1.31	67	14.17-20.53	17.90	1.31
Length of posterior cleithrum process (PcPL)	91	27.69-39.74	34.76	3.25	67	31.47-42.15	36.02	2.38
Depth of posterior cleithrum process (PcPD)	90	10.44-15,46	13.58	1.24	67	14.23-20.34	17.19	1.40
Horizontal length of nuchal foramina	92	4,82-10.15	7.82	1.38	67	5.48-11.97	8.33	1.40

Coloration. In alcohol, head and body tan to brown, or grey, countershaded. Faint dark stripe from anterior margin of upper lip to anterior margin of eye. A conspicuous dark blotch on the first three branched dorsal-fin rays and membranes, blotch starting from midlength of rays and membranes and almost reaching their distal tips, which are pale. Tip of upper caudalfin lobe only rarely darkened. In life, ground color yellowish or greenish laterally and white ventrally; lower lip pinkish. Eye silvery, distinctly contrasted with pale surrounding adipose tissue. Distribution. Hassar wilderi occurs in the Tocantins and Araguaia river basins, in Brazil ( Fig. 6 ). Ecology. Like its congeners, specimens of Hassar wilderi are usually collected over sandy beaches (substrate sometimes with fine gravel or muddy), and often in the main channel of large rivers. Santos et al. (1984) stated that individuals of H. wilderi reach sexual maturity with approximately 15 cm long. Eggs are deposited between November and January. Etymology. Named in honor of B. G. Wilder, who sent the collection made by C. F. Hartt in Brazil to C. H. Eigenmann for identification. The catfishes of this collection were then transmitted to E. M. Kindle for final determination.According to Kindle (1895: 249) , the collection contained 19 genera and 27 species, including two new species: Hassar wilderi and Hemiancistrus longipinnis (= Baryancistrus longipinnis ). Table 4. Morphometric data for type specimens of the Hassar orestis and H. wilderi . SD = standard deviation.

Hassar orestis		Hassar wilderi
H. orestis H. orestis H. ucayalensis H. wilderi				H. wilderi	H. iheringi
LectotypeParalectotypes Holotype			Lectotype	Paralectotypes	Holotype
NMW	NMW 45427,	ANSP	SU 2243 CAS 60710, 60711 ANSP
45428	45429, 45430,	68647	69393
78651
Standard length (SL) (mm)	66.8	148.3-207.9	68.9	157.7	142.3-181.2	135.6
Percent of standard length
Head length (HL)	31.73	31.08-33.69	31.93	32.50	30.85-31.29	32.08
Predorsal distance (PdD)	44.97	42.74-44.75	42.38	40.11	39.49-41.05	40.86
Prepectoral distance (PpD)	31.38	29.80-31.92	29.03	29.30	27.69-28.53	30.97
Prepelvic distance	57.05	55.32-58.10	53.70	58.15	53.55-55.46	57.15
Preanal distance	76.15	75.10-79.24	75.47	76.92	76.46-76.49	75.96
Body depth at dorsal-fin origin (BD)	21.83	20.20-21.81	19.74	22.74	23.34-24.39	22.79
Body depth at 10th scute (BD10)	17.49	14.48-17.40	13.21	18.15	17.16-19.11	17.63
Body depth at anal-fin origin	14.22	11.98-14.56	11.18	15.38	14.18-15.53	14.60
Dorsal-fin spine length (DSL)	26.14	18.70-22.66	25.11	24.12-25.93
Dorsal-fin lobe length	25.40	18.57-23.47	22.64	22.94
Dorsal-fin base length	11.40	11.49-12.30	11.76	13.58-13.95	11.73
Distance from dorsal-fin origin to adipose-fin terminus (DOAD)	44.53	46.97-49.78	45.43	52.65	50.72-53.48	45.80
Adipose-fin base length (AdFB)	9.60	5.17-7.65	5.08	7.45	6.90-10.96	8.33
Distance from adipose-fin terminus to caudal-fin origin (AdCD)	14.07	12.76-15.68	15.97	13.85	15.74-16.06	16.67
Pectoral-fin spine length (PSL)	25.33	20.99-24.46	25.83	23.89-23.90
Distance from pectoral-fin origin to pelvic-fin origin (PPD)	26.06	25.82-27.24	25.98	26.40	25.72-27.59	26.40
Pelvic-fin lobe length (PFL)	13.42	11.36-13.10	14.08	14.96	14.76-15.12	16.08
Distance from pelvic-fin origin to adipose-fin origin (PAD)	19.69	19.02-21.75	18.87	23.02	21.19-23.33	20.28
Anal-fin base length (AnFB)	12.97	8.64-11.64	10.16	10.47	10.49-11.31	9.73
Distance from anal-fin terminus to caudal-fin origin (AnCD)	13.13	10.65-13.72	14.51	13.29	16.06-16.16	15.56
Caudal-peduncle depth (CPD)	6.56	5.19-6.07	5.08	6.09	6.07-6.61	6.12
Percent of body depth at 10th midlateral scute
th Depth of 10 scute (PD10)	17.5	12.03-16.33	14.29	7.33	5.1-5.51	6.10
Percent of head length
Body width at opercle (BWO)	51.23	50.00	51.32	48.68-51.03	46.44
Body width at nuchal shield (BWNP)	22.85	22.73	22.32-22.93	21.84
Body wigth at cleithrum (CW)	61.63	53.68-60.54	62.73	60.92	63.33-65.38	62.53
Adipose-eye diameter (AED)	34.51	24.47-32.65	32.27	31.89	28.57-31.66	29.89
Eye diameter (ED)	29.07	18.23-23.93	27.27	27.55	24.69-24.83	26.90
Snout length (SnL)	55.53	53.28-58.82	50.91	49.53	50.57-56.61	54.02
Distance from snout to anterior nare (SAND)	30.80	25.44-29.44	25.00	22.19	24.83-25.57	25.75
Distance from snout to posterior nare (SPND)	45.01	44.11-46.43	39.55	36.04	35.98-38.04	37.24
Distance from snout to terminus of adipose eye (SPOD)	84.31	80.23-85.37	83.18	57.74	81.78-81.83	81.38
Distance from terminus of adipose eye to terminus of nuchal shield (PL) 60.94		49.01-55.99	55.45	51.28	52.85-52.91	51.72
Distance from anterior nares to terminus of adipose eye (ANPOD)	55.48	54.08-60.35	56.82	57.55	55.13-56.61	54.94
Distance from posterior nares to terminus of adipose eye (PNPOD)	41.36	39.98-42.38	42.27	43.77	43.74-46.56	45.06
Interorbital width (IW)	16.84	15.33-18.51	15.00	18.06	18.22-19.22	15.63
Length of posterior cleithrum process (PcPL)	39.23	33.40-40.57	36.36	36.81	36.45-37.57	37.93
Depth of posterior cleithrum process (PcPD)	15.50	14.28-17.14	13.64	16.87	18.22-19.05	19.08
Horizontal length of nuchal foramina	11.13	9.34-9.70

Remarks. According to Fowler’s (1941a) description of Hassar iheringi , three of the four type specimens (including the holotype ) were collected in “Rio Parnahyba, Terezina, Piauhy”. Examination of these specimens, however, revealed that they possess some characters that are absent in specimens from northeastern Brazilian drainages, which are herein referred to as H. affinis . Those characters are: many thin, branched lateral diverticula on entire margin of gas bladder, dark blotch over the median portion of the first branched dorsal-fin rays, first five postinfranuchal scutes developed with two posteriorly directed thorns, and relatively deep body (see Tables 1 to 4). Actually, these features are present in H. wilderi , who seems to occur exclusively in the Tocantins basin according to the specimens we examined. This indicates that the locality of three type specimens of H. iheringi referred by Fowler (1941a) is probably wrong, and that those specimens were probably collected in the Tocantins basin. Similar locality errors have already been recorded by Vari (1995) , Vari & Harold (2001), and Castro & Vari (2004). We therefore consider that H. iheringi is a junior synonym of H. wilderi , and that Fowler (1941a) ’s referred locality is wrong. Hassar wilderi was described based on four specimens first deposited in the Cornell University (under catalogue numbers CU 1703-1705, plus one uncatalogued specimen), which were then transferred to the Indiana University to be identified by Eigenmann (catalogued as IU 5120). Eigenmann’s (1925) monograph listed the specimens as “I.U.M. 5120, types, 162 and 207 mm ” (measurements given in TL), and included an illustration of the smallest specimen ( Eigenmann, 1925 : pl. 22, fig. 2). Those specimens were subsequently transferred to the Stanford University, and Myers & Weitzman (1956) elected as lectotype one of them (CU 1704), catalogued as SU 2243. The specimens were finally transferred to the California Academy of Sciences, where the paralectotypes are catalogued as CAS 60710 ( 181.2 mm SL or 208 mm SL) and CAS60711 ( 139.5 mm SL or 168 mm TL), while the lectotype remained as SU 2243 ( 157.7 mm SL or 191 mm TL). Sabaj & Ferraris (2003) considered Eigenmann (1925) ’s figure as a designation of lectotype , with the consequence that Myers & Weitzman (1956)’s designation of lectotype is invalid. Nevertheless, Eigenmann (1925) considered both specimens as types, and clearly did not intend to elect a lectotype . We therefore prefer to accept Myers & Weitzman (1956)’s designation of the lectotype as valid.