Trichorhina cipoensis, Campos-Filho & Taiti, 2016

Trichorhina cipoensis View in CoL n. sp.

( Figs. 8–10 View Figure 8 View Figure 9 View Figure 10 , 14 View Figure 14 )

Type material. Holotype: 1 ♂ ( MZUSP 34106 View Materials ), Minas Gerais, PCNP, Lapa do Cipó cave , 15º3’13”S 44º11”38”W, 5.VI.2014, leg. J.E. Gallão, D. von Schimonsky & B.G.O. Monte. Paratypes: 2 ♂♂ (one in micropreparations), 1 ♀ ( MZUF 9616 View Materials ) , 1 ♂, 4 ♀♀ ( MZUSP 34107 View Materials ), same data as holotype .

Description. Body length: ♂ 4.5 mm, ♀ 5 mm. Bfdy cflfrless, slightly cfnvex ( Fig. 8A View Figure 8 ). Dfrsal surface cfvered with fan-shaped scale-setae ( Fig. 8B View Figure 8 ); perefn epimera with glandular pfres; small noduli laterales ( Fig. 8E View Figure 8 ) inserted fn fne line clfse tf pfsterifr margins and mfre fr less at same distance frfm lateral margins ff perefnites, d/c and b/c cffrdinates as in Fig. 9A, B View Figure 9 , respectively. Cephalfn ( Fig. 8C, D View Figure 8 ) with lateral lfbes triangular, slightly prftruding frfntwards; suprantennal line, frfntal line and eyes absent; vertex with nf scale-setae at sides. Plefn ( Fig. 8A, F View Figure 8 ) with futline cfntinufus with that ff perefn; epimera ff plefnites 3–5 falciffrm, directed backwards. Telsfn ( Fig. 8F View Figure 8 ) triangular, lateral margins slightly cfncave and apex narrfwly rfunded. Antennula ( Fig. 8G View Figure 8 ) with three articles, distal article lfngest with several aesthetascs inserted apically and sub-apically. Antenna ( Fig. 8H View Figure 8 ) when extended pfsterifrly surpassing pfsterifr margin ff perefnite 1; flagellum with twf articles, secfnd article abfut three times as lfng as first, bearing twf rfws of two aesthetascs each, apical organ short with long free sensilla.Mandibles ( Fig. 9C, D View Figure 9 ) with molar penicil simple, left mandible with 2+1 penicils, right mandible with 1+1 penicils. Maxillula ( Fig. 9E View Figure 9 ) inner branch with two subequal penicils, distal portion bearing lateral tip; outer branch with 3+4 teeth, outer set with accessory tooth, inner set with two cleft teeth. Maxilla ( Fig. 9F View Figure 9 ) with setose and bilobate apex; outer lobe about three times as wide as inner lobe, distal margin rounded. Maxilliped ( Fig. 9G View Figure 9 ) basis rectangular bearing sparse scale-setae; endite subrectangular, medial seta surpassing distal margin. Uropod ( Fig. 8I View Figure 8 ) protopod grooved on outer margin, exopod slightly longer than endopod, endopod inserted proximally. Pereopod sternal setae with cleft apex; pereopod 1 with antennal grooming brush reaching median margin of carpus; dactylus with long inner claw, ungual and dactylar seta with simple apex.

Male. Pereopod 1–3 ( Fig. 10A View Figure 10 ) merus and carpus with brush of setae on sternal margin. Pereopod 7 ( Fig. 7J View Figure 7 ) ischium with sternal margin slightly convex.Genital papilla as in Fig. 10B View Figure 10 . Pleopod 1 ( Fig. 10C View Figure 10 ) exopod subtriangular, twice as broad as long, rounded apex; endopod three times as long as exopod, distal part acute. Pleopod 2 ( Fig. 10D View Figure 10 ) exopod triangular, outer margin concave bearing six setae; endopod slightly longer than exopod. Pleopod 3 and 4 exopods as in Fig. 10E, F View Figure 10 . Pleopod 5 exopod ( Fig. 10G View Figure 10 ) triangular, outer margin convex bearing seven setae.

Etymology. This new species is named after the locality where specimens were collected: Lapa do Cipó cave, Peruaçu caves National Park, Minas Gerais.

Remarks. The genus Trichorhina comprises about 70 described species widely distributed in tropical and subtropical areas ( Schmalfuss, 2003; Souza et al., 2011; Campos-Filho et al., 2014). In Brazil, the genus includes 23 species, five of which occurring in caves: Trichorhina anhanguera Campos-Filho, Araujo & Taiti, 2014 , Trichorhina curupira Campos-Filho, Araujo & Taiti, 2014 , Trichorhina guanophila Souza-Kury, 1993 , Trichorhina kaingangi Campos-Filho, 2015 , and Trichorhina yiara Campos-Filho, Araujo & Taiti, 2014 ( Souza-Kury, 1993; Campos-Filho et al., 2014, 2015).

In the absence of eyes Trichorhina cipoensis n. sp. is similar to T. anhanguera , Trichorhina anophthalma Arcangeli, 1936 , Trichorhina boneti Rioja, 1956 , Trichorhina brasilensis Andersson, 1960 , Trichorhina buchnerorum ( Verhoeff, 1942) , Trichorhina caeca Vandel 1952b , T. guanophila , T. kaingangi , Trichorhina paolae Caruso, 1978 , Trichorhina sicula Vandel, 1969 , Trichorhina simoni ( Dollfus, 1893) , Trichorhina xoltunae Mulaik, 1960 , and Trichorhina zimpanensis Mulaik, 1960 . It is distinguished from all these species by the different shape of the male pleopod 1 exopod; from T. anhanguera in having more developed pleon epimera, telson with narrowly rounded apex, maxillula outer branch with two cleft teeth (vs. all entire); from T. anophthalma in the cephalon with triangular instead of quadrangular frontal lateral lobes and male pereopod 7 ischium with convex instead of slightly concave sternal margin (see Reboleira et al., 2015); from T. brasilensis in the cephalon with shorter lateral lobes, mandibles with molar penicil simple (vs. dichotomized); from T. buchnerorum , T. caeca , T. paolae , T. sicula and T. simoni in having narrowly rounded apex (vs. obtuse or broadly rounded apex); from T. guanophila , T. xoltunae and T. zimpanensis in having the antennula with many aesthetascs subapically and apically inserted (vs. few aesthetascs inserted apically), mandibles with simple molar penicil (vs. dichotomized); and from T. kaingangi in having narrower body shape, mandibles with simple molar penicil (vs. dichotomized), maxillula outer branch with two cleft teeth.

This species occurs in the same cave of Xangoniscus odara n. sp. It was collected from organic matter substrate, such as guano and leaf litter.