Taxonomic revision of Brasiloniscus (Oniscidea, Pudeoniscidae) with description of a new species Cardoso, Giovanna Monticelli Campos-Filho, Ivanklin Soares Araujo, Paula Beatriz European Journal of Taxonomy 2018 2018-05-08 434 1 16 N7N2 Cardoso & Campos-Filho & Araujo, 2018 Cardoso & Campos-Filho & Araujo 2018 [566,839,581,608] Malacostraca Pudeoniscidae Brasiloniscus GBIF Animalia Isopoda 8 9 Arthropoda species littoralis gen. et sp. nov.   Figs 5–6, 7C    Diagnosis Body with dorsal surface slightly tuberculate, telson triangular with lateral sides concave and distal portion narrow, dactylar seta with fringe of small setae on apex, male pleopod 1 exopod as long as wide with deep re-entrance on distal portion, and male pleopod 1 endopod with distal portion acute bearing a slight lobe on inner margin.    Etymology The new specific epithet refers to the Latin adjective ‘littoralis’, used to describe the seashore/coast, in reference to the locality where the specimens were collected.    Material examined  Holotype   BRAZIL: 1 ♂, state of Rio de Janeiro, Trindade, 23°19′47.71″ S, 44°42′20.59″ W, on tree bark,  6 Dec. 2013, G.M. Cardosoand I.S. Campos-Filholeg. ( MZUSP 36181).   Paratypes   BRAZIL: 1 ♂, 2 ♀♀, same data as for holotype( MZUSP 36182).   Description MEASUREMENTS. Maximum body length: ♂ 7 mm.  BODY. Habitus in lateral view as in Fig. 5A. Color dark brown with yellow spots, one line on epimera ( Fig. 7C). Dorsum ( Fig. 5A) with ribs on pereonites, covered by fan-shaped scale-setae ( Fig. 5B); noduli lateralesshort, inserted at same distance from lateral margin and in each pereonite progressively near to posterior margin. CEPHALON ( Fig. 5C–D). Lateral lobes slightly bent upwards, frontal shield with lateral sides concave; eyes consisting of 15–20 ommatidia. PEREON ( Fig. 5A, C–E). Pereonite 1 epimeron with strong dorsolateral furrow, schisma with inner lobe rounded and not surpassing outer lobe on posterior margin. Pereonite 2 with ventral lobe well developed.  PLEON( Fig. 5F–G). Neopleura 5 shorter than distal margin of uropod protopod; telson with shallow dorsal depression and apex rounded. ANTENNULA ( Fig. 5H). Proximal and distal articles similar in length, distal article with subapical aesthetascs and distal tip.   Fig. 5.  Brasiloniscus littoralis gen. et sp. nov., paratype, ♂ (MZUSP 36182). A. Habitus, lateral view. B. Dorsal scale-setae. C. Cephalon and pereonite 1, dorsal view. D. Cephalon, frontal view. E. Pereonites 1–3, ventral view. F. Pleonites 4 and 5, telson and uropods, ventral view. G. Pleonites 4 and 5, telson and uropods, dorsal view. H. Antennula. I. Antenna. J. Antennal flagellum. K. Left mandible. L. Right mandible. M. Maxillula. N. Maxilla. O. Maxilliped. P. Maxilliped endite. Scale bar: 1 mm. ANTENNA ( Fig. 5I–J). Fifth article of peduncle longer than flagellum. Flagellum with second article longer than third article, bearing one pair of lateral aesthetascs.  MOUTH. Buccal pieces ( Fig. 5K–P) as in  B. maculatus gen. et comb. nov., except left mandible with 2+1 penicils, maxillula inner branch with distal tip and maxilliped endite with two hooks on distal margin.   Fig. 6.  Brasiloniscus littoralis gen. et sp. nov., paratype, ♂ (MZUSP 36182). A. Uropod. B. Pereopod 1. C. Pereopod 1 dactylus. D. Pereopod 7. E. Genitalia. F. Pleopod 1. G. Pleopod 1 endopod. H. Pleopod 2. I. Pleopod 3 exopod. J. Pleopod 4 exopod. K. Pleopod 5 exopod. PEREOPODS 1–7 ( Fig. 6B–D). Merus and carpus with sparse setae on sternal margin; carpus 1 with distal seta serrate at apex and longitudinal antennal grooming brush; dactylus with inner claw not surpassing outer claw, dactylar seta simple with fringe of small setae on distal portion, ungual seta simple. UROPOD ( Fig. 6A). Protopod as long as endopod, endopod twice as long as exopod. PLEOPOD EXOPODS. Respiratory areas as in diagnosis.  Male PEREOPOD 7 ( Fig. 6D). Ischium as long as base, propodus twice as long as carpus. GENITAL PAPILLA. As in Fig. 6E. PLEOPODS. Pleopod 1 ( Fig. 6F–G) exopod slightly wider than long, deep re-entrancy on distal margin, inner and outer margins rounded, outer and distal margins bearing setae; endopod twice as long as exopod, distal portion directed outwards with small inner lobe and narrow apex. Pleopod 2 ( Fig. 6H) exopod with outer margin sinuous bearing many setae; endopod longer than exopod. Pleopod 3 exopod ( Fig. 6I) triangular, outer margin concave bearing many small setae. Pleopods 4–5 exopods ( Fig. 6J–K) rhomboid, outer margin slightly concave bearing small setae along the margin.    Remarks The new species resembles  B. maculatus gen. et comb. nov.in the shape of body and male pleopod 1; it can be easily distinguished in the shape of the telson, pereopod 7 base without lobe on distal sternal margin, and dactylar seta with fringe of thin setae on the distal portion.   Fig. 7. A.  Brasiloniscus maculatus(Lemos de Castro, 1973) gen. et comb. nov., paratype, ♂ (MNRJ 6212). – B.  Brasiloniscus verrucosus(Lemos de Castro, 1973) gen. et comb. nov., paratype, ♀ (MNRJ 6214). – C.  Brasiloniscus littoralis gen. et sp. nov., paratype, ♂ (MZUSP 36182). Scale bars: 1 mm. As mentioned previously, the male of  B. verrucosus gen. et comb. nov.remains unknown, which makes a comparison with the new species difficult. However,  B. littoralis gen. et sp. nov.is distinguished from  B. verrucosus gen. et comb. nov.in the absence of dorsal tuberculation (see also Fig. 7B–C). 1846472197 2013-12-06 MZUSP Cardoso & I. S. Campos-Filho Brazil -23.32992 Trindade 1 -44.70572 8 9 MZUSP 36181 1 1 Rio de Janeiro holotype 1846472200 [189,961,1308,1335] 2013-12-06 MZUSP Cardoso & I. S. Campos-Filho Brazil -23.32992 Trindade 1 -44.70572 8 9 MZUSP 36182 3 2 1 Rio de Janeiro holotype