Leonardoscia hassalli, 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 : 379-383

LEONARDOSCIA HASSALLI CAMPOS- FILHO, ARAUJO & TAITI SP. NOV.

FIGURES 14–16, 40

Type material

Holotype: ♂, Brazil, Pará, Altamira, Caverna Leonardo da Vinci , 3°09′02″S, 52°04′10″W, 17 December 2010, leg. M.E. Bichuette and J.E. Gallão ( MZUSP 27525 ).

Paratypes: One ♂, eight ♀, same data as holotype ( MZUSP 27526 ); two ♂, same locality as holotype, 14 April 2009, leg. M.E. Bichuette ( MZUSP 27527 ) .

Etymology

The new species is named after Prof. Mark Hassall, for his contribution to the knowledge on the biology of Oniscidea .

Description

Maximum length: ♂ and ♀, 2.5 mm. Body outline as in Figure 14A. Body colourless. Dorsum covered with semicircular scales and numerous fan-shaped scale setae ( Fig. 14G); noduli laterales with b/c and d/c coordinates as in Figure 14B; gland pores not visible. Cephalon ( Fig. 14C–E) with suprantennal line bent down in the middle; eyes reduced, consisting of four ommatidia. Telson with distal part triangular, with straight sides and obtuse apex ( Fig. 14F). Antennule ( Fig. 14H) with first and third articles subequal in length, second article shorter; third article with two long apical aesthetascs and a tuft of six aesthetascs on medial margin. Antenna ( Fig. 14I) reaching back middle pereonite 2; fifth article of peduncle swollen; flagellum as long as fifth article of peduncle, distal flagellar article longer than first and second, and bearing two aesthetascs, apical organ as long as distal article of flagellum, showing sensory hairs enclosed by a common tube-like sheath, free sensilla short and inserted at one-quarter of the length of the apical organ. Mandibles ( Fig. 15A,B) with molar penicil consisting of five branches, 2 + 1 free penicils on the left and 1 + 1 on the right mandible. Maxillule ( Fig. 15C) outer branch with 4 + 5 teeth (four cleft); inner branch with two long narrow penicils at apex. Maxilla ( Fig. 15D) with setose and bilobate apex; outer lobe about twice as wide as inner lobe, and with distal margin rounded. Maxilliped ( Fig. 15E) basis rectangular, with sparse triangular scale setae; endite with short setae and two triangular teeth at apex. Pereopods dactylus with long inner claw, ungual and dactylar setae flagelliform, with simple apex. Pereopod 1 ( Fig. 15G) with transverse antennal grooming brush and one seta with handlike apex. Uropod (15F) with exopod distinctly longer than endopod.

Male: Pereopod 7 ( Fig. 16A) ischium with sternal margin slightly convex and bearing two long setae. Genital papilla ( Fig. 16B) with a triangular ventral shield and two apical orifices. Pleopod 1 ( Fig. 16C) exopod triangular, about as wide as long, with medial and outer margins rounded; endopod with distal portion bearing a subapical triangular lobe on medial margin, acute apex. Pleopod 2 ( Fig. 16D) exopod triangular, outer margin slightly concave and bearing one seta; endopod with short basal article, narrow distal article about twice as long as exopod, with distal portion equipped with some triangular teeth and an arrow-like apex. Pleopods 3 and 4 exopods ( Fig. 16E,F) subquadrangular, bearing three and four setae, respectively. Pleopod 5 exopod ( Fig. 16G) triangular, outer margin convex, bearing three long setae, acute apex.