Metaprosekia quadriocellata, 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 : 383-387

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-FFB6-FF92-03CC-CDA6FDFB49E7
treatment provided by	Marcus
scientific name	Metaprosekia quadriocellata
status	sp. nov.

Treatment

METAPROSEKIA QUADRIOCELLATA View in CoL CAMPOS- FILHO, ARAUJO & TAITI SP. NOV.

FIGURES 17–19 View Figure 17 View Figure 18 View Figure 19 , 40 View Figure 40

Type material

Holotype: ♂, Brazil, Pará, Altamira, Caverna Leonardo da Vinci , 3°09′48″S, 52°05′09″W, 14 April 2009, leg. M.E. Bichuette ( MZUSP 27528 View Materials ). GoogleMaps

Paratypes: Brazil, Pará, Altamira , one ♂, same data as holotype ( MZUSP 27529 View Materials ) GoogleMaps ; one ♀, 3°15′11″S, 52°11′08″W, 8 July 2009, leg. M.E. Bichuette ( MZUSP 27530 View Materials ) GoogleMaps , one ♂, two ♀ (part of one in micropreparations), 11 April 2009, leg. M.E. Bichuette ( MZUSP 27531 View Materials ) ; one ♂ (part in micropreparations), one ♀, Abrigo do Sismógrafo , 3°17′18″S, 52°13′28″W, 9 April 2009, leg. M.E. Bichuette ( MZUSP 27532 View Materials ) GoogleMaps ; one ♂, one ♀, Abrigos Assurini , 3°15′04″S, 52°10′45″W, 15 December 2010, leg. M.E. Bichuette and J.E. Gallão ( MZUF 7698 View Materials ) GoogleMaps .

Etymology

Latin: quadri = four + ocellatus = having eyes. The name refers to the small eye of the species, consisting of only four ommatidia.

Description

Maximum length: ♂, 3.6 mm; ♀, 4 mm. Body elongated, outline as in Figure 17A View Figure 17 . Colour yellowish brown, antenna and uropods completely pigmented, cephalon with irregular pale spots, pereonites 1–7 with the usual muscle pale spots, pereonites 4–7 with a longitudinal medial pale spot, pleon completely pigmented, telson displaying four small pale spots. Dorsum covered with sparse pointed scale setae ( Fig. 17C View Figure 17 ); one line of noduli laterales per side, inserted more or less at the same distance from the lateral margin of pereonites, b/c and d/c coordinates as in Figure 17B View Figure 17 ; gland pores not visible. Cephalon ( Fig. 17D,E View Figure 17 ) lacking frontal line, suprantennal line slightly sinuous; eyes reduced, with four ommatidia. Pleon narrower than pereon; pleonites 3–5 reduced, adpressed, with no visible posterior points ( Fig. 17A View Figure 17 ). Telson ( Fig. 17F View Figure 17 ) with distal part triangular, with slightly concave sides and obtuse apex. Antennule ( Fig. 17G View Figure 17 ) of three articles, first article longer than second and third, third article with apical aesthetascs and a tuft of five aesthetascs on medial margin. Antenna ( Fig. 17H View Figure 17 ) reaching rear margin of pereonite 3; flagellum as long as fifth article of peduncle, third flagellar article longer than first and second, and bearing one row of 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. 17I,J View Figure 17 ) with molar penicil consisting of five or six branches, 2 + 1 free penicils on the left and 1 + 1 on the right mandible. Maxillule ( Fig. 18A View Figure 18 ) outer branch with 4 + 5 (four cleft) teeth and one slender seta; inner branch with two short penicils and a short triangular point. Maxilla ( Fig. 18B View Figure 18 ) with setose and bilobate apex; outer lobe about twice as broad as inner lobe, with distal margin rounded. Maxilliped ( Fig. 18C View Figure 18 ) basis rectangular; endite setose on the medial and distal margins, one seta overpassing distal margin, and one triangular point on outer corner. Pereopod dactylus with ungual seta simple, apex reaching tip of outer claw, dactylar seta short, reaching base of inner claw. Uropod ( Fig. 18D View Figure 18 ) protopod grooved on the distal half of the outer margin; exopod longer than endopod; insertion of endopod proximal to that of exopod.

Male: Pereopod 1 ( Fig. 18E View Figure 18 ) and pereopod 7 ( Fig. 18F View Figure 18 ) with no distinct sexual differentiation. Genital papilla ( Fig. 19A View Figure 19 ) with a triangular ventral shield and two subapical orifices. Pleopod 1 ( Fig. 19B View Figure 19 ) exopod cordiform, with distal margin broadly rounded, and outer margin concave; endopod with distal portion narrow, bearing minute setae, and bent outwards. Pleopod 2 ( Fig. 19C View Figure 19 ) exopod triangular, outer margin concave, bearing two setae; endopod distinctly longer than exopod. Pleopods 3 and 4 exopods ( Fig. 19D,E View Figure 19 ) rhomboidal, with distal margins bearing two and four setae, respectively. Pleopod 5 exopod ( Fig. 19F View Figure 19 ) triangular, outer margin sinuous, bearing three long setae.

Remarks

Leistikow (2000) established Metaprosekia for the new species M. nodilinearis from the Venezuelan Cordilleras, and included the genus in the Prosekiini . Leistikow (2001a) considers the small eye with three ommatidia and the position of noduli laterales in a line at the same distance from the lateral margins of the pereonites as possible autoapomorphies of the genus. The new species here described shows all the characters of the genus except for the eye with four ommatidia. In general, eye size cannot be considered as a good generic character as it is linked to the ecology of the species. Metaprosekia qudriocellata sp. nov. is readily distinguished from M. nodilinearis by the eye with four instead of three ommatidia, seven instead of 12 aesthetascs on the antennule, shorter dactylar organ on pereopods, male pleopod 1 exopod with wider and more broadly rounded distal part, and different shape of the male pleopods 1–5 exopods.