Trichorhina pataxosi, Campos-Filho & Taiti, 2016

Trichorhina pataxosi View in CoL n. sp.

( Figs. 11–14 View Figure 11 View Figure 12 View Figure 13 View Figure 14 )

Type material. Holotype: 1 ♂ ( MZUSP 34108 View Materials ), Minas Gerais, Pedro Leopoldo, Gruta do Sufoco , 19º25’53”S 44º2’8”W, 12–15.I.2009, leg. F.P. Franco. GoogleMaps Paratypes: many ♂♂ and ♀♀ ( MZUSP 34109 View Materials ) , 4 ♂♂ (one in micropreparations), 4 ♀♀ ( MZUF 9617 View Materials ), same data as holotype GoogleMaps ; 1 ♂ ( MZUSP 34110 View Materials ), same locality and collector as holotype, 5–6.X.2009 GoogleMaps , 1 ♀ ( MZUSP 34111 View Materials ), Pedro Leopoldo , Gruta do Nei, 19º37’45”S 44º0’30”W, 5–6.X.2009, leg. F.P. Franco GoogleMaps , 1 ♂, 3 ♀♀, 1 manca ( MZUSP 34112 View Materials ) same locality, 12–15.I.2009, leg. F.P. Franco. GoogleMaps

Description. Body length: ♂ 3.5 mm, ♀ 4.5 mm. Body ( Fig. 11A View Figure 11 ) colorless, slightly convex, outline of pleon continuous with that of pereon. Dorsal surface covered with fan-shaped scale-setae ( Fig. 11B View Figure 11 ); 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 View Figure 11 , respectively. Cephalon with lateral lobes triangular, slightly protruding frontwards,suprantennal line,frontal line and eyes absent ( Fig. 11C, D View Figure 11 ). Pereonites 1 and 2 epimera with posterior corners right-angled, pereonites 3–7 gradually directed backwards. Pleon ( Fig. 11A, E View Figure 11 ) with epimera falciform, directed backwards. Telson ( Fig. 11E View Figure 11 ) triangular, lateral margins concave with narrowly rounded apex. Antennula ( Fig. 11H View Figure 11 ) with three articles, distal article with tuft of aesthetascs subapically and apically inserted. Antenna ( Fig. 11I View Figure 11 ) 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 View Figure 12 ) with molar penicil simple, left mandible with 2+1 penicils, and right mandible with 1+1 penicils. Maxillula ( Fig. 12C View Figure 12 ) inner branch with two subequal penicils, distal portion bearing lateral tip; outer branch with 3+5 teeth. Maxilla ( Fig. 12D View Figure 12 ) with setose and bilobate apex; outer lobe about three times as wide as inner lobe, distal margin rounded. Maxilliped ( Fig. 11E View Figure 11 ) 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 View Figure 13 ) protopod grooved on outer margin bearing glandular fields, exopod slightly longer than endopod, endopod inserted proximally.

Male. Pereopod 1–7 ( Fig. 13B, C View Figure 13 ) 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 View Figure 13 ) 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 View Figure 13 ) exopod triangular, outer margin slightly concave bearing nine setae; endopod as long as exopod. Pleopod 3 and 4 exopods as in Fig. 13F, G View Figure 13 . Pleopod 5 exopod ( Fig. 13H View Figure 13 ) 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.