Spelunconiscus castroi, Campos-Filho & Araujo & Bichuette & Trajano & Taiti, 2014

Campos-Filho, Ivanklin Soares, Araujo, Paula Beatriz, Bichuette, Maria Elina, Trajano, Eleonora & Taiti, Stefano, 2014, Terrestrial isopods (Crustacea: Isopoda: Oniscidea) from Brazilian caves, Zoological Journal of the Linnean Society (Zool. J. Linn. Soc.) 172 (2), pp. 360-425 : 368

publication ID	https://doi.org/ 10.1111/zoj.12172
publication LSID	lsid:zoobank.org:pub:246C2229-308B-4A9B-A150-CE1D27D2EBD8
persistent identifier	https://treatment.plazi.org/id/CF6FE30C-FFA9-FF81-03B6-C9A9FA454F33
treatment provided by	Marcus
scientific name	Spelunconiscus castroi
status	sp. nov.

Treatment

SPELUNCONISCUS CASTROI View in CoL CAMPOS- FILHO, ARAUJO & TAITI SP. NOV.

FIGURES 5–8 View Figure 5 View Figure 6 View Figure 7 View Figure 8 , 40 View Figure 40

Type material

Holotype: ♂, Brazil, Minas Gerais, Matozinhos, Gruta MOC-32, 19°31′S, 44°03′W, 8–18 February 2011, leg. F. Franco ( MZUSP 27521 View Materials ). GoogleMaps

Paratypes: Two ♂ (one in micropreparations), same data as holotype ( MZUSP 27522 View Materials ) GoogleMaps .

Etymology

The species is named after Prof. Alceu Lemos de Castro, for his invaluable contribution to the knowledge of terrestrial isopods from Brazil.

Description

Maximum length: 6 mm. Body colourless, elongated, pereon with almost parallel sides ( Fig. 5A View Figure 5 ). Dorsal surface smooth ( Fig. 5B View Figure 5 ), with pointed scale setae ( Fig. 5C View Figure 5 ). Eyes absent. Cephalon ( Fig. 5D–F View Figure 5 ) with small quadrangular antennary lobes; profrons with a small carena and suprantennal line distinctly bent down in the middle. Posterior margin of pereonites 1–3 straight, and of pereonites 4–7 progressively more concave. Pleonites 3–5 epimera reduced, adpressed, with no posterior points visible in dorsal view. Telson ( Fig. 5G View Figure 5 ) with concave sides and broadly rounded apex. Antennule ( Fig. 5H View Figure 5 ) with distal article longer than second and first, conical, and bearing five short and stout aesthetascs. Antenna ( Fig. 5I View Figure 5 ) with fifth article of peduncle shorter than flagellum; flagellum of between five and seven articles, according to animal size. Mandibles with two penicils on the left ( Fig. 6A View Figure 6 ) and one penicil on the right ( Fig. 6B View Figure 6 ). Outer branch of maxillule with 5 + 5 teeth, apically entire, and two slender stalks ( Fig. 6C View Figure 6 ); inner branch with proximal penicil longer than the two apical ones. Maxilla with setose and bilobate apex, inner lobe smaller ( Fig. 6D View Figure 6 ). Maxilliped basis enlarged on distal portion, outer, inner, and distal margins bearing a fringe of thin setae; endite rectangular and narrow, bearing a large apical penicil ( Fig. 6E View Figure 6 ). Uropod ( Fig. 7A View Figure 7 ) with endopod as long as exopod, and inserted at similar level. Pereopod 1 ( Fig. 7B View Figure 7 ) carpus with transverse antennal grooming brush. Pereopod 7 ( Fig. 7C View Figure 7 ) basis with lines of scales for the water conducting system, ischium with sternal margin straight and two setae on tergal margin, merus slightly concave, and carpus longer than merus. Genital papilla ( Fig. 8A View Figure 8 ) with a conical shape and narrow and elongated apical part. Pleopod 1 ( Fig. 8B View Figure 8 ) exopod triangular, elongated, outer margin concave, distal margin rounded, a fringe of thin setae along inner, distal, and outer margins; endopod narrow, with almost parallel sides, slightly shorter than exopod, basal part enlarged, distal part flagelliform. Pleopod 2 ( Fig. 8C View Figure 8 ) exopod subretangular, with median portion narrow- er, distal margin slightly sinuous, and bearing four setae; endopod of two articles, about five times longer than exopod, second segment enlarged, more than twice as long as first, distal part narrow, triangular, bearing a subapical spine. Pleopod 3 exopod ( Fig. 8D View Figure 8 ) trapezoidal, bearing six strong setae and with a fringe of thin setae along the margins. Pleopods 4 and 5 exopods ( Fig. 8E,F View Figure 8 ) rhomboidal, bearing three and four strong setae, respectively, and covered with thin setae on the medial part.

Remarks

These specimens were collected in water, but other specimens have also been observed out of the water (M.E.B., pers. observ.), so the species should be considered as amphibian rather than aquatic. Other aquatic or amphibian species in the family Styloniscidae are known from Thailand ( Thailandoniscus annae Dalens, 1989 ) and southern China ( Trogloniscus clarkei Taiti & Xue, 2012 and Trogloniscus trilobatus Taiti & Xue, 2012 ).