Brasiloniscus littoralis

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

publication ID

https://doi.org/10.5852/ejt.2018.434

persistent identifier

http://treatment.plazi.org/id/03DB9962-FFAD-FFEF-FDD9-163ECA95F22B

treatment provided by

Plazi

scientific name

Brasiloniscus littoralis
status

gen. et sp. nov.

Brasiloniscus littoralis  gen. et sp. nov.

urn:lsid:zoobank.org:act:5C0F5435-A652-4345-AF75-76D746432BFE

Figs 5–6View Fig. 5View Fig. 6, 7C View Figure

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. Cardoso and I.S. Campos-Filho leg. ( MZUSP 36181View Materials).GoogleMaps 

Paratypes

BRAZIL: 1 ♂, 2 ♀♀, same data as for holotype ( MZUSP 36182View Materials).GoogleMaps 

Description

MEASUREMENTS. Maximum body length: ♂ 7 mm.

BODY. Habitus in lateral view as in Fig. 5A View Figure . Color dark brown with yellow spots, one line on epimera ( Fig. 7C View Figure ). Dorsum ( Fig. 5A View Figure ) with ribs on pereonites, covered by fan-shaped scale-setae ( Fig. 5B View Figure ); noduli laterales short, inserted at same distance from lateral margin and in each pereonite progressively near to posterior margin.

CEPHALON ( Fig. 5C–D View Figure ). Lateral lobes slightly bent upwards, frontal shield with lateral sides concave; eyes consisting of 15–20 ommatidia.

PEREON ( Fig. 5A, C–E View Figure ). 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 View Figure ). Neopleura 5 shorter than distal margin of uropod protopod; telson with shallow dorsal depression and apex rounded.

ANTENNULA ( Fig. 5H View Figure ). Proximal and distal articles similar in length, distal article with subapical aesthetascs and distal tip.

ANTENNA ( Fig. 5I –J View Figure ). 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 View Figure ) 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–D View Figure ). 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 View Figure ). Protopod as long as endopod, endopod twice as long as exopod.

PLEOPOD EXOPODS. Respiratory areas as in diagnosis.

Male

PEREOPOD 7 ( Fig. 6D View Figure ). Ischium as long as base, propodus twice as long as carpus.

GENITAL PAPILLA. As in Fig. 6E. View Figure

PLEOPODS. Pleopod 1 ( Fig. 6F–G View Figure ) 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 View Figure ) exopod with outer margin sinuous bearing many setae; endopod longer than exopod. Pleopod 3 exopod ( Fig. 6I View Figure ) triangular, outer margin concave bearing many small setae. Pleopods 4–5 exopods ( Fig. 6J–K View Figure ) 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.

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 View Figure ).