Pectenoniscus pankaru Campos-Filho, Torres & Bichuette, 2022

Campos-Filho, Ivanklin Soares, Gallo, Jessica S., Gallao, Jonas E., Torres, Dayana F., Carpio-Diaz, Yesenia M., Lopez-Orozco, Carlos Mario, Borja-Arrieta, Ricardo, Taiti, Stefano & Bichuette, Maria Elina, 2022, Expanding the knowledge on the diversity of the cavernicolous Styloniscidae Vandel, 1952 (Oniscidea, Synocheta) from Brazil, with descriptions of two new species from the semiarid karst regions, ZooKeys 1101, pp. 35-55 : 35

publication ID	https://dx.doi.org/10.3897/zookeys.1101.79043
publication LSID	lsid:zoobank.org:pub:CD8B4971-44FE-427C-A246-89090051416D
persistent identifier	https://treatment.plazi.org/id/416BE93E-CA7C-4D98-9D6C-FE1BB265D264
taxon LSID	lsid:zoobank.org:act:416BE93E-CA7C-4D98-9D6C-FE1BB265D264
treatment provided by	ZooKeys by Pensoft
scientific name	Pectenoniscus pankaru Campos-Filho, Torres & Bichuette
status	sp. nov.

Treatment

Pectenoniscus pankaru Campos-Filho, Torres & Bichuette View in CoL sp. nov.

Figs 1 View Figure 1 , 3E View Figure 3 , 4A-C View Figure 4 , 5 View Figure 5 , 6 View Figure 6

Material examined.

Brazil ● 1♂, holotype, Gruna do Govi, Feira da Mata, Serra do Ramalho karst area, Bambuí geomorphological group, state of Bahia, 13°56'43.30"S, 44°14'25.94"W, 12.X.2020, leg. ME Bichuette, DF Torres, JS Gallo, LS Horta and JE Gallão, LES 27761 View Materials GoogleMaps ● 1♂ (parts in micropreparations), paratype, same data as for holotype, LES 27762 View Materials GoogleMaps ● 2 ♀♀, paratypes, same data as for holotype, LES 27763 View Materials GoogleMaps .

Description.

Maximum length: ♂ 2.2 mm, ♀ 3.5 mm. Dorsal surface slightly granulated, granules on pereonites 1-7 in two transverse rows, pleon smooth (Fig. 4A, B View Figure 4 ). Dorsal scale-setae tricorn-shaped (Fig. 5A View Figure 5 ). Cephalon (Figs 4C View Figure 4 , 5B View Figure 5 ) with well-developed quadrangular antennary lobes, slightly directed outwards; profrons with suprantennal line bent downwards medially. Pereonite 1-3 epimera with postero-lateral corners right-angled, 4-7 progressively more acute and directed backwards; pleonite 5 epimera with glandular pores at sides near distal margins (Figs 4A, B View Figure 4 , 5C View Figure 5 ). Telson (Fig. 5C View Figure 5 ) almost three times as wide as long, with concave sides and rounded apex. Antennula (Fig. 5D View Figure 5 ) with distal article longer than second and first, and bearing at least 12 aesthetascs. Antenna (Fig. 5E View Figure 5 ) with fifth article of peduncle as long as flagellum, bearing one distal strong seta; flagellum of four articles, first article longest, apical organ as long as distal article of flagellum. Mandibles as in Fig. 5F, G View Figure 5 , right mandible with leaf-like lacinia mobilis. Maxillula (Fig. 5H View Figure 5 ) with two robust penicils; outer endite with 4+5 teeth, apically simple, one subapical slender stalk near medial margin. Maxilla as in Fig. 5I View Figure 5 . Maxilliped (Fig. 5J View Figure 5 ) basis with lateral sides fringed with fine setae; palp with first article bearing two setae, distal articles fused and bearing many setae on lateral margins; endite much longer than wide, lateral margins covered with fine setae, distal margin bearing two strong setae and one elongated penicil. Grooves and scales for water conducting system on ischium, merus, carpus and propodus of pereopod 6 and basis of pereopod 7 (Fig. 6C View Figure 6 ). Dactylus with ungual seta simple and dactylar seta bifid and setose. Uropod (Fig. 6A View Figure 6 ) protopod and exopod grooved on outer margins bearing glandular pores; exopod longer than endopod, endopod inserted proximally.

Male. Pereopods 1-6 (Fig. 6B View Figure 6 ) without any sexual modifications. Pereopod 7 (Fig. 6C View Figure 6 ) propodus with brush of setae on rostral margin. Genital papilla (Fig. 6D View Figure 6 ) enlarged on median portion, apical part narrow and elongated. Pleopod 1 (Fig. 6D View Figure 6 ) protopod subrectangular, distal margin sinuous; exopod subtriangular, outer margin almost straight, proximal and outer margins convex; endopod longer than exopod, basal article short, distal article three times longer than basal one. Pleopod 2 (Fig. 6E View Figure 6 ) exopod ovoid, more than three times as wide as long; endopod of two articles, thickset, second article more than twice as long as first, distally bearing round shaped lobe directed outwards. Pleopod 5 exopod (Fig. 6F View Figure 6 ) subquadrangular, slightly wider than long, bearing three setae, distal margin rounded.

Etymology.

The new species is named for the indigenous people Pankaru, who inhabited the northern portion of Serra do Ramalho region.

Remarks.

Pectenoniscus pankaru sp. nov. differs from all other species of the genus in the shape of the male pleopod 2 endopod. Moreover, it differs in having the antennal flagellum composed of four articles (vs. five in P. angulatus , three in P. carinhanhensis , P. iuiuensis , P. juveniliensis , P. lilae , P. montalvaniensis , P. morrensis and P. santanensis ), antennula bearing 12 aesthetascs (vs. six in P. morrensis and P. santanensis , eight in P. angulatus and P. montalvaniensis , nine in P. juveniliensis and P. lilae , ten in P. iuiuensis , and 11 in P. carinhanhensis ) (see also Andersson 1960; Campos-Filho et al. 2019; Cardoso et al. 2020b).

Specimens of Pectenoniscus pankaru sp. nov. were found only in the aphotic zone associated to the sediment banks close to a small subterranean stream (Fig. 2B View Figure 2 ) and characterised by high humidity levels, which are more suitable for terrestrial isopods. The specimens were collected near vegetable debris.