Ten new species of the genus Brevisomabathynella Cho, Park and Ranga Reddy, 2006 (Malacostraca, Bathynellacea, Parabathynellidae) from Western Australia Author Cho, Joo-Lae Author Humphreys, W. F. text Journal of Natural History 2010 2010-03-31 44 17 - 18 993 1079 http://dx.doi.org/10.1080/00222930903537066 journal article 10.1080/00222930903537066 1464-5262 4590640 Brevisomabathynella parooensis sp. nov. ( Figures 23–25 ) Material examined Holotype (adult male), allotype (adult female), paratypes (each one adult male and female). Holotype : dissected on five slides ( WAM C 40286) . Allotype : dissected on five slides ( WAM C 40287) . Paratypes : one adult male and one adult female each dissected on five slides ( WAM C 40288–C 40289) . Table 4. Intraspecific variation of Brevisomabathynella jundeeensis sp. nov. (data acquired from the eight dissected specimens).

Holotype (Ƌ)	Allotype (♀)	Paratype 1 (Ƌ)	Paratype 2 (Ƌ)	Paratype 3 (Ƌ)	Paratype 4 (♀)	Paratype 5 (♀)	Paratype 6 (♀)
Body length (mm)	3.42	3.33	3.38	3.13	3.07	3.32	3.33	3.30
Antennule (segments)
Firstsegment:no.dorsalsetae	3	3	3	2	2	3	3	3
Second segment: no. setae on	4,6	6	5	5	4	5	7	7
inner distal margin
Third segment: no. setae on inner	6	6	6	5	5	6	6	6
distal margin
Fifth segment: no. of setae on	5	5	5	4	4	4	4	4
inner distal margin
No. of spines of spine row of	13	11	10	9	8	11	11	11
mandible
Setal formula of maxilla	5-5-11-9	4-5-11-9	5-5-11-9	4-5-11-9	2-4-10-8	4-5-11-9	4-6-12-9	4-6-12-9
Thoracopods I–VII
No. of exopodal segments	5-7-8-9-9-9-8	5-6-7-8-8-8-7	5-6-7-8-8-7-7	4-6-6-7-7-7-6	3-4-5-5-5-5-4	5-6-7-7-7-7-7	5-6-8-8-9-8-8	5-6-8-8-9-8-8
Setal formula of Th. I	3+1/5+1/2	3+1/4+1/2	3+1/4+1/2	3+1/4+1/2	2+1/3+1/1	3+1/4+1/2	3+1/5+1/2	3+1/5
+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/2+1/4(2)
Setal formula of Th. II	2+1/5+1/2	2+1/4+1/1	2+1/4+1/2	2+1/3+1/1	1+1/2+1/0	2+1/5+1/2	2+1/5+1/2	2+1/5+1/2
+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/5(3)	+1/5(3)
Setal formula of Th. III	2+1/5+1/2	2+1/4+1/1	2+1/4+1/1	2+1/3+1/1	1+1/3+1/0	2+1/5+1/2	2+1/4+1/2	2+1/4+1/2
+1/5(3)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/5(3)	+1/5(3)
Setal formula of Th. IV	2+1/6+1/2	1+1/4+1/1	1+1/5+1/1	2+1/4+1/1	1+1/3+1/0	1+1/5+1/2	1+1/5+1/2	1+1/5+1/2
+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/5(3)	+1/5(3)

( Continued ) Table 4. (Continued).

Holotype (Ƌ)	Allotype (♀)	Paratype 1 (Ƌ)	Paratype 2 (Ƌ)	Paratype 3 (Ƌ)	Paratype 4 (♀)	Paratype 5 (♀)	Paratype 6 (♀)
Setal formula of Th. V	2+1/5+1/2	1+1/4+1/1	1+1/5+1/1	1+1/3+1/1	1+1/3+1/0	1+1/4+1/2	1+1/5+1/2	1+1/5+1/2
+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/5(3)	+1/5(3)
Setal formula of Th. VI	1+1/5+1/1	1+1/4+1/1	1+1/4+1/1	1+1/3+1/1	1+1/2+1/0	1+1/4+1/2	1+1/4+1/2	1+1/4+1/2
+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)
Setal formula of Th. VII	1+1/4+1/3	1+1/3+1/1	1+1/3+1/1	1+1/2+1/1	0+1/2+1/0	1+1/3+1/2	1+1/4+1/2	1+1/4+1/2
+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)	+1/4(2)
Uropod
No. of spines on sympod	15	14	15	15	11	15	14	14
No. of setae on exopod	11	12	11	10	6	10	12	12
Furcal rami
No. of spines on inner margin	12	11	11	10	4	12	9	9

Figure 23. Brevisomabathynella parooensis sp. nov. (Ƌ, holotype; ♀, allotype): (A) right antennule Ƌ (dorsal); (B) right antenna Ƌ (dorsal); (C) labrum Ƌ (ventral); (D) left mandible Ƌ (dorsal); (E) left maxillule Ƌ (dorsal); (F) left maxilla (dorsal); (G) right thoracopod I Ƌ (frontal); (H) right thoracopod VIII Ƌ (inner lateral); (I) right and left thoracopods VIII ♀. Scale bars 0.05 mm. Figure 24. Brevisomabathynella parooensis sp. nov. (Ƌ, holotype): (A) left thoracopod II Ƌ (frontal); (B) right thoracopod VI Ƌ (frontal); (C) pleopod I Ƌ (ventral); (D) pleotelson, furcal rami and uropod Ƌ (dorsal); (E) pleotelson, furcal rami and uropod Ƌ (lateral). Scale bars 0.05 mm. Type locality Australia , Western Australia , Carey Palaeodrainage , Paroo Station GSWA 15 South ( 26°24′01″ S , 119°45′47″ E ), BES 5620, 5 July 2001 , leg. W.F. Humphreys , C.H.S. Watts and S.J.B.Cooper. Figure 25. Brevisomabathynella parooensis sp. nov. (Ƌ, holotype): (A) right thoracopod III (frontal); (B) right thoracopod IV (frontal); (C) right thoracopod V (frontal); (D) right thoracopod VII (frontal). Scale bar 0.05 mm. Description of adult male ( holotype ) Body. Length 2.01 mm . Head as long as anterior three thoracic segments 1–3 combined, approximately 10 times as long as wide Antennule ( Figure 23A ). Seven-segmented. First segment with one seta on inner margin, with two simple dorsal setae and with one dorsal, one ventromedial and two lateral plumose setae. Second segment with one group of four plumose setae and with five simple setae on inner margin. Third segment with three lateral setae including one plumose seta and four setae on inner margin. Inner flagellum of third segment with three simple setae. Fourth segment with one stub seta and one plumose seta on dorsal margin, and with two stub setae and two plumose setae on outer distal apophysis. Fifth segment with one simple seta and one plumose seta on inner margin, and with one dorsal simple seta and two aesthetascs. Sixth segment with four setae on inner margin and with dorsal group of two aesthetascs, one simple seta and one additional aesthetasc lateral to simple seta. Seventh segment with three subterminal aesthetascs and four simple setae. Antenna ( Figure 23B ). Five-segmented, as long as antennular segments 1–3 combined. Fourth segment slightly shorter than fifth segment. Setal formula: 0+0/0+0/ 1+1/1+1/3(1). Plumose seta of distal segment longer than longest simple seta. Labrum ( Figure 23C ). Flat, with eight teeth of more or less similar size flanked by four teeth decreasing in size laterally on each side. Ventral surface with six teats and numerous combs of ctenidia. Mandible ( Figure 23D ). Incisor process of five teeth. Tooth of ventral edge triangular. Spine row consisting of nine spines. Palp of one segment, with one apical seta. Maxillule ( Figure 23E ). Two-segmented. Proximal segment with four setae on inner margin. Distal segment with two terminal spines and five inner spines with denticles, of which most proximal is weak, and with three simple setae of different size on outer margin. Maxilla ( Figure 23F ). Four-segmented, setal formula 3-5-11-9. Thoracopods I–VII ( Figures 23G , 24A,B , 25 A–D). Thoracopods I–IV increasing in size posteriorly. Thoracopods IV–VII similar in size. Thoracopods I–VII each bearing one epipod on protopod. Basipod of thoracopods I–VII with one seta. Number of exopodal segments of thoracopods I–VII: 5-6-6-7-7-6-6. Endopod of thoracopods I– VII four-segmented, setal formulae: Th. I 2+1/3+1/1+1/4(2) Th. II–VII 1+1/2+2/0+1/4(2) Thoracopod VIII ( Figure 23H ). Rectangular in frontal view, 1.5 times as long as wide. Protopod massive, with prominent penial region. Epipod large, triangular, distal part barely reaching terminal end of penial region. Basipod without setae, inner margin of basipod drawn out into projection. Exopod one-third size of basipod, triangular, with four to five terminal teeth and two subterminal setae. Endopod onehalf size of exopod, with two terminal seta. First pleopod ( Figure 24C ). In form of two small stubs separated from each other. Each stub bearing two terminal seta. Uropod ( Figure 24D,E ). Twelve spines of similar size on inner margin of sympod. Exopod 60% as long as sympod, with eight setae on outer and terminal margin, without basiventral setae. Endopod 44% as long as sympod, with two dorsal plumose setae near base, with two terminal setae and one subterminal plumose seta on outer margin, and with one terminal, one subterminal and three additional spines on inner margin. Terminal spine twice as long and thick as subterminal spine. Three inner spines tiny, tooth-like. Pleotelson ( Figure 24D,E ). One seta near base of each furcal ramus on both sides. Anal operculum flat. Furcal rami ( Figure 24D,E ). Twice as long as wide, with two large terminal spines, and six smaller spines on inner margin, and with two dorsal setae. Description of adult female ( allotype ) Body. Length 1.97 mm . Identical to male except for following characters. Antennule. Fifth segment with three setae on inner margin. Maxilla. Setal formula: 4-5-11-9. Thoracopods I–VII. Number of exopodal segments of thoracopods I–VII: 5-6-7-7-7-7-6. Thoracopod VIII ( Figure 23I ). Conical, half as long as endopod of male thoracopod VIII, with one terminal tooth. Uropod. Exopod with eight setae. Intraspecific variation Body length of paratypes : male 1.90 mm ; female 1.67 mm . Variation in number of setae, spines or segments of extremities as listed in Table 5 . Etymology The specific name refers to Paroo Pastoral Station.