Redescription of Parapagurapseudopsis carinatus (Tanaidacea: Apseudomorpha) and remarks about the male form Author Santos, Kátia Christol Dos Author Pires-Vanin, Ana Maria Setubal text Zootaxa 2006 1363 39 48 journal article 10.5281/zenodo.174727 e8851fbe-bd1d-4328-aeb6-75c57a902dfc 1175-5326 174727 Parapagurapseudopsis carinatus Brum, 1973 ( Figs. 1–4 ) Brumia carinata Bäcescu, 1981 Parapagurapseudopsis carinata Guţu, 1998 . Original description: Brum (1973) : 3, fig.3; 1974: 7–10, figs. 27–37. Material examined: 88 individuals. BRASIL , Bahia : MZUSP 16915, (1 preparatory, 1 immature female), Baía de Todos os Santos, Itaparica Island, V-2004 , St. 0 2, 13° 10.279´S – 38° 40.408´W , 27m ; MZUSP 16916, (1 preparatory and 1 immature females), St. 0 3, 13° 10.803´S – 38° 43.546´W , 18m ; MZUSP 16917, (1 preparatory female), St. 0 1, 13° 4.759´S – 38° 38.745´W , 16m ; MZUSP 16918, ( 22 males ; 5 immature females, 18 preparatory females; 4 females with eggs, 5 with embryos, 6 with empty marsupium; 15 juveniles ), Baía de Todos os Santos, Guaibim beach, same date and col., St. 0 4, 13° 12.79´S – 38° 48.69´W , 18m ; MZUSP 16919, ( 1 male , 3 immature female, 1 preparatory female, 1 female with empty marsupium,), St. 0 5, 13° 14.033´S – 38° 52.5´W , 15m . Female redescription. Body 1.7 mm long, cylindric ( Fig. 1 a,b). Cephalothorax longer than broad; dorsal surface finely ornamented with discrete dorsodistal carina. Eye lobes present, without visual elements. Rostrum truncate, short, rounded. Epistome present. Pereon about 2.5 times the cephalothorax length, strong, indurate, with dorsal carina on all pereonites. First and sixth pereonites shortest; second and fifth pereonites a little shorter than the third and fourth ones. Pleon, as long as cephalothorax, with five short pleonites, decreasing in width, distally; pleonites with dorsal carina. Pleotelson ( Fig. 1 a–d) longer than wide, almost equal to pleonites 3–5 length, apex finely serrate; two lateral spiniform projections subapically placed. Antenna 1 ( Fig. 2 a) article 1 shorter than carapace length, 7 times as long as wide, both inner and outer margins with irregular spinous apophyses, intercalate for simple and plumose setae; distal spine on outer margin followed by a circumplumose setae near joint with article 2. Second peduncle article about 3.5 times shorter than the first, and the third one equal to the second article. Inner flagellum 4-articulate; outer flagellum 7-articulate, distal articles with aesthetascs. Antenna 2 ( Fig. 2 b) with a very large inner expansion; article 2 with two great spiniform projections on inner and outer margins; outer margin with some acute and small processus; one medial simple seta on inner margin. Squama small, having one simple seta. Third article very short. Folowing two articles thin, each of them longer than the second article. Last three articles (measured together) about as long as fourth or third articles. Mandible ( Fig. 2 c) with triarticulate palp; article 1 with serrate margin and three plumose setae; article 2 longer than the first or the third ones ( Fig. 2 c2); articles 2 and 3 with simple setae. Molar robust, without special features. Incisor of both mandibles and lacinia mobilis of the left mandible with four strong spines. Setiferous lobe with five setae, branched terminally. Labrum ( Fig. 2 g) with fine hairs on lateral margin. Labium ( Fig. 2 d) with broad and setulose area at outer margin, palp with fine lateral setules and two simple setae distally. Maxilla 1 ( Fig. 2 f) with a biarticulate palp, ending in 4 subequal setae. Inner endite with a prominence on the middle of the outer side, fine hairs on lateral margins and five single sided pinnate setae apically situated. Outer endite long and narrow, lateral sides hairy, 11 spiniform setae on apical margin and two subterminal simple setae. Maxilla 2 ( Fig. 2 e) with no special features; broad, having lobes with simple and with setulated setae, outer fixed lobe with two trifurcate and three pinnate setae. Maxilliped ( Fig. 3 a) basis longer than wide with 4 plumose setae diagonally; palp of 4 articles, first article wider than long, with plumose seta at inner margin; second article broadest, larger at base, with 4 short plumose setae and several simple setae at inner margin; third and fourth articles equal in length with simple setae distally. Endite with with several kinds of setae and two coupling hooks. Epignath ( Fig. 2 h) lobate with one simple seta distally. Cheliped ( Fig. 4 c) with exopodite (broken off, not illustrated); basis globose; carpus 1.5 times the merus length. Propodus large, broad with row of simple setae on dorsal margin of fixed finger. Pereopod 1 ( Fig. 3 b) long and thin, approximately similar to the following ones, but a little shorter than the last three pereopods. Exopod absent. Coxa rounded. Basis slightly longer than merus, carpus and propodus together, ventral margin with sparce short setae, dorsal margin with one strong denticle and some short spiny projections. Merus shorter than the carpus or propodus. Carpus and propodus bearing 4–5 short cuspidate setae along ventral margin, an elongate seta distally on propodus; dactylus about 2.5 times longer than curved unguis. Pereopods 2 and 3 ( Fig. 3 c,d) relatively similar to the preceding one, but a little smaller; the fourth pereopod smaller than the third one. Pereopods 4 to 6 ( Fig. 3 e–g) subequal, fourth pereopod longer than others. Pereopod 4 carpus and propodus with cuspidate setae ventrally, last article with one pinnate and some simple setae distally. Pereopod 5 bearing a dense row of short spiniform setae at distal half. FIGURE 1. Parapagurapseudopsis carinatus : a, body, dorsal view, female; b, same, lateral view; c, body dorsal view, male; c, same, lateral view; e, left cheliped; e1 exopod; f, right cheliped, f1, basis right cheliped. FIGURE 2. Parapagurapseudopsis carinatus , female: a, antenna 1; b, antenna 2; c, right mandible; c.1 incisor left mandible; c.2, palp mandible; d, labium; e, maxilla 2; f, maxila 1; g, labrum; h.1, h.2, epignath. FIGURE 3. Parapagurapseudopsis carinatus , female: a, maxilliped; b, pereopod 1; c, pereopod 2; d, pereopod 3; e, pereopod 4; f, pereopod 5; g, pereopod 6; h, pleopod. FIGURE 4. Parapagurapseudopsis carinatus , female: a, uropod, young male; b, lateral view; b.1, right side; b.2, left side of the first part of body,female; c, cheliped. Pereopod 6 ( Fig. 3 g) dactylus with a conspicuous protuberance larger than in preceding pereopods. Pleopod ( Fig. 3 h) in five pairs, well developed in males and females, decreasing in size posteriorly. Protopod long with two articles, basal article nearly 14 times shorter, distal article with 2 long plumose setae. Endopod biarticulate with long plumose setae distally; exopod slightly longer than endopod bearing a short proximal and a long distal plumose seta. Uropod ( Fig. 4 a) basal article about 2.7 times longer than wide; exopod triarticulate, endopod with 17 articles. Oostegites in 4 pairs. Description of the males. Body similar to the same of females. Chelipeds subequal. Propodus of the larger cheliped approximately of the same length as first four pereonites together; basis with dorsal margin serrate. Another cheliped about 2.5 times smaller than larger one. Exopod ( Fig.1 e.1) triarticulate, with two plumose setae. Geographic distribution. BRASIL : Bahia . Habitat. Shallow waters, bottom with corals, algae, carbonate materials and/or rhodolites. Remarks. The right cheliped on young males was found to be larger than the left ( Fig.4 b1, b2), the opposite that occurs on adults ( Fig. 1 e,f) as observed in two undamaged exemplars. This appendage is easily broken probably because of its great size when compared with the body length, or lost by autotomy. From all the examined specimens, only two males were found with chelipeds. Males without chelipeds were recognized by the presence of their genital cone. The number of antennal and uropodal articles in addition to pereopodal setation varies between individuals. In spite of the absence of the illustration of the cheliped in the original description ( Brum, 1973 ) and the lack of cheliped in the type material we examined, the author stated that this appendix lacks an exopod. This statement was not confirmed through the examination of our material. Brum (1973) also described the rostrum of P. c a r i n a t u s as having a short tiny mesial spine. However, the species has a truncate rostrum and what can be observed in a dorsal view is the apex of the epistoma. Indeed, the epistoma was also named, in a wrong way, of pseudorostrum ( Brum, 1973 ) and conic clypeus ( Brum, 1974 ).