Trichorhina pataxosi Campos-Filho & Taiti, 2016, n. sp.
Creators: name: Campos-Filho, Ivanklin Soares
name: Taiti, Maria Elina Bichuette and Stefano
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Malacostraca
Isopoda
Platyarthridae
Trichorhina
Trichorhina pataxosi

description: Trichorhina pataxosi n. sp.
(Figs. 11–14)
Type material. Holotype: 1 ♂ (MZUSP 34108), Minas Gerais, Pedro Leopoldo, Gruta do Sufoco, 19º25’53”S 44º2’8”W, 12–15.I.2009, leg. F.P. Franco. Paratypes: many ♂♂ and ♀♀ (MZUSP 34109), 4 ♂♂ (one in micropreparations), 4 ♀♀ (MZUF 9617), same data as holotype; 1 ♂ (MZUSP 34110), same locality and collector as holotype, 5–6.X.2009, 1 ♀ (MZUSP 34111), Pedro Leopoldo, Gruta do Nei, 19º37’45”S 44º0’30”W, 5–6.X.2009, leg. F.P. Franco, 1 ♂, 3 ♀♀, 1 manca (MZUSP 34112) same locality, 12–15.I.2009, leg. F.P. Franco.
Description. Body length: ♂ 3.5 mm, ♀ 4.5 mm. Body (Fig. 11A) colorless, slightly convex, outline of pleon continuous with that of pereon. Dorsal surface covered with fan-shaped scale-setae (Fig. 11B); one line of noduli laterales inserted close to the posterior margins and more or less at same distance from lateral margins of pereonites, d/c and b/c coordinates as in Fig. 11F, G, respectively. Cephalon with lateral lobes triangular, slightly protruding frontwards,suprantennal line,frontal line and eyes absent (Fig. 11C, D). Pereonites 1 and 2 epimera with posterior corners right-angled, pereonites 3–7 gradually directed backwards. Pleon (Fig. 11A, E) with epimera falciform, directed backwards. Telson (Fig. 11E) triangular, lateral margins concave with narrowly rounded apex. Antennula (Fig. 11H) with three articles, distal article with tuft of aesthetascs subapically and apically inserted. Antenna (Fig. 11I) when extended posteriorly surpassing posterior margin of pereonite 1; flagellum with two articles, second article about three times as long as first, bearing two aesthetascs, apical organ short with long free sensilla. Mandibles (Fig. 12A, B) with molar penicil simple, left mandible with 2+1 penicils, and right mandible with 1+1 penicils. Maxillula (Fig. 12C) inner branch with two subequal penicils, distal portion bearing lateral tip; outer branch with 3+5 teeth. Maxilla (Fig. 12D) with setose and bilobate apex; outer lobe about three times as wide as inner lobe, distal margin rounded. Maxilliped (Fig. 11E) basis rectangular bearing sparse setae; endite subrectangular, medial seta surpassing distal margin, distal margin rounded bearing one hook-like short spine. Pereopod 1 with antennal grooming brush transverse reaching median part of carpus; dactylus with inner claw reaching median portion of outer claw, dactylar and ungual setae with simple apices. Uropod (Fig. 13A) protopod grooved on outer margin bearing glandular fields, exopod slightly longer than endopod, endopod inserted proximally.
Male. Pereopod 1–7 (Fig. 13B, C) merus and carpus with brush of long setae on sternal margin; ischium 7 triangular, sternal margin straight and distal margin bearing three large setae. Pleopod 1 (Fig. 13D) exopod subtriangular, slightly wider than long with broadly rounded apical part; endopod tapering, twice as long as exopod, medial margin bearing minute setae. Pleopod 2 (Fig. 13E) exopod triangular, outer margin slightly concave bearing nine setae; endopod as long as exopod. Pleopod 3 and 4 exopods as in Fig. 13F, G. Pleopod 5 exopod (Fig. 13H) triangular, outer margin slightly convex bearing 10 setae.
Etymology. The new species is named after the native people Pataxós who originally inhabited the Brazilian states of Bahia and Minas Gerais.
Remarks. Trichorhina pataxosi n. sp. can be distinguished from Trichorhina cipoensis n. sp. by the different shape of dorsal scale-setae, the maxillula outer branch with inner teeth simple, maxilliped endite with hook-like distal spine, more acute distal part of telson, and male pereopods 1–7 merus and carpus densely setose. This species was collected in guano and leaf litter in two caves of Lagoa Santa region, which are under severe threat by mining.
description: Published as part of Campos-Filho, Ivanklin Soares & Taiti, Maria Elina Bichuette and Stefano, 2016, ree new species of terrestrial isopods (Crustacea, Isopoda, Oniscidea) from Brazilian caves, pp. 1-19 in Nauplius (e 2016001) (e 2016001) 24 on pages 13-15, DOI: 10.1590/2358-2936e2016001, http://zenodo.org/record/14665170