Cardoso, Giovanna Monticelli, Campos-Filho, Ivanklin Soares & Araujo, Paula Beatriz, 2018, Taxonomic revision of Brasiloniscus (Oniscidea, Pudeoniscidae) with description of a new species, European Journal of Taxonomy 434, pp. 1-16: 9-13
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gen. et sp. nov.
Brasiloniscus littoralis gen. et sp. nov.
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.
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.
MEASUREMENTS. Maximum body length: ♂ 7 mm.
BODY. Habitus in lateral view as in Fig. 5AView Fig. 5. Color dark brown with yellow spots, one line on epimera ( Fig. 7CView Fig. 7). Dorsum ( Fig. 5AView Fig. 5) with ribs on pereonites, covered by fan-shaped scale-setae ( Fig. 5BView Fig. 5); noduli laterales short, inserted at same distance from lateral margin and in each pereonite progressively near to posterior margin.
CEPHALON ( Fig. 5C –DView Fig. 5). Lateral lobes slightly bent upwards, frontal shield with lateral sides concave; eyes consisting of 15–20 ommatidia.
PEREON ( Fig. 5A, C –EView Fig. 5). 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 –GView Fig. 5). Neopleura 5 shorter than distal margin of uropod protopod; telson with shallow dorsal depression and apex rounded.
ANTENNULA ( Fig. 5HView Fig. 5). Proximal and distal articles similar in length, distal article with subapical aesthetascs and distal tip.
ANTENNA ( Fig. 5I –JView Fig. 5). 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 –PView Fig. 5) 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.
PEREOPODS 1–7 ( Fig. 6B –DView Fig. 6). 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. 6AView Fig. 6). Protopod as long as endopod, endopod twice as long as exopod.
PLEOPOD EXOPODS. Respiratory areas as in diagnosis.
PEREOPOD 7 ( Fig. 6DView Fig. 6). Ischium as long as base, propodus twice as long as carpus.
GENITAL PAPILLA. As in Fig. 6E.View Fig. 6
PLEOPODS. Pleopod 1 ( Fig. 6F –GView Fig. 6) 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. 6HView Fig. 6) exopod with outer margin sinuous bearing many setae; endopod longer than exopod. Pleopod 3 exopod ( Fig. 6IView Fig. 6) triangular, outer margin concave bearing many small setae. Pleopods 4–5 exopods ( Fig. 6J –KView Fig. 6) rhomboid, outer margin slightly concave bearing small setae along the margin.
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.
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 –CView Fig. 7).
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