Amazoniscus spica Campos-Filho, Aguiar & Taiti,
Campos-Filho, Ivanklin Soares, Fernandes, Camile Sorbo, Cardoso, Giovanna Monticelli, Bichuette, Maria Elina, Aguiar, José Otávi, 2020, New species and new records of terrestrial isopods (Crustacea, Isopoda, Oniscidea) of the families Philosciidae and Scleropactidae from Brazilian caves, European Journal of Taxonomy 606, pp. 1-38: 23-27
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|Amazoniscus spica Campos-Filho, Aguiar & Taiti|
Body pigments and eyes absent, frontal shield bent backwards over vertex, dactylus of pereopods with ungual seta simple and surpassing outer claw, male pleopod 1 exopod heart-shaped and male pleopod 1 endopod with distal portion bent outwards, bearing small setae on median margin.
The nameof this new speciesrefers to the binary star of Spica, the brightest star in the Virgo constellation. In the Brazilian flag, this star represents the state of Pará.
BRAZIL – Pará State,Parauapebas, Canaãdos Carajás • ♂; Jaguar, CAV-20; 6°24′22″ S, 50°22′09″ W; 20–29 May 2012; Mescolotti leg.; MZUSP 40046.GoogleMaps
BRAZIL • 1 ♂, 2 ♀♀; same collection data as for holotype; parts of ♂ and 1 ♀ in micropreparations; MZUSP 40047 • 1 ♀; CAV-17; 6°24′24″ S, 50°22′10″ W; 8–15 Mar. 2012; Oliveira leg.; MZUSP 40048.GoogleMaps
MEASUREMENTS. Maximum body length: male and female 5.5 mm.
BODY. Body pigment absent. Endoantennal conglobation. Body ( Fig. 11AView Fig) strongly convex; dorsal surface smooth, bearing small triangular scale-setae ( Fig. 11BView Fig). Noduli laterales ( Fig. 11CView Fig) very short, inserted near posterior margins and at same distance from lateral margins.
CEPHALON. Frontal shield bent backwards over vertex, lateral sides slightly protruding in frontal view, frontal margin broadly rounded; eyes absent ( Fig. 11AView Fig, D–E).
PEREON. Pereonite 1 without schisma or ventral lobes; pereonites 1–4 with posterior margin straight, 5–7 gradually more concave; pereonite 1 epimera with anterior corners directed frontwards, those of 2–4 with outer margin rounded, and those of 5–7 subquadrangular ( Fig. 11AView Fig).
PLEON. Outline continuous with pereon, epimera 3–5 well developed, directed backwards with acute apices; telson triangular, slightly broader than long, with slightly concave sides, rounded apex. ( Fig. 11FView Fig).
ANTENNULA. Composed of three articles, distal article longest, conical bearing about 10 lateral aesthetascs arranged in five sets ( Fig. 11GView Fig).
ANTENNA. Short and stout, not surpassing pereonite 1 when extended backwards; flagellum consisting of two subequal articles, distal article bearing two lateral aesthetascs; apical organ as long as distal article of flagellum ( Fig. 11HView Fig).
MOUTH. Mandibles with dense cushion of setae on incisor process, molar process with 10 branches, left mandible ( Fig. 12AView Fig) with 2+1 penicils, right mandible ( Fig. 12BView Fig) with 1+1 penicils. Maxillula ( Fig. 12CView Fig) inner endite with two apical penicils, distal margin bearing outer tip; outer endite with 4+5 teeth, inner set with four teeth, apically cleft. Maxilla ( Fig. 12DView Fig) inner lobe rounded and covered with thick setae; outer lobe rounded, twice as wide as inner lobe, covered with thin setae. Maxilliped ( Fig. 12EView Fig) basis with fringe of thin setae on distal outer margin; palp with one strong seta on proximal article; endite subrectangular, medial seta surpassing distal margin, distal margin covered with thin setae and bearing one seta on outer portion, rostral surface with setose sulcus ending with one short penicil.
PEREOPODS. Pereopod 1 carpus with short, transverse antennal grooming brush; dactylus with two claws, dactylar seta simple, not surpassing outer claw, ungual seta simple, surpassing outer claw.
UROPOD. Protopod flattened and enlarged, filling gap between pleonite 5 and telson; exopod inserted on median margin, endopod twice as long as exopod and inserted proximally ( Fig. 12FView Fig).
PLEOPOD EXOPODS. Pleopods 1 and 2 with respiratory areas.
PEREOPOD 1. Merus and carpus with sternal margin covered with short scales and sparse strong setae ( Fig. 13AView Fig).
PEREOPOD 7. Ischium elongated, sternal margin straight; carpus twice as long as merus ( Fig. 13BView Fig).
GENITAL PAPILLA. Bearing triangular ventral shield, papilla slightly longer than ventral shield bearing two subapical orifices ( Fig. 13CView Fig).
PLEOPODS. Pleopod 1 ( Fig. 13DView Fig) exopod heart-shaped; endopod twice as long as exopod, distal portion bent outwards and bearing small setae on median margin. Pleopod 2 ( Fig. 13EView Fig) exopod triangular, outer margin concave; endopod flagelliform, longer than exopod. Exopods of pleopods 3 and 4 as in Fig. 13F and GView Fig, respectively. Pleopod 5 exopod ( Fig. 13HView Fig) triangular, outer margin sinuous, distal portion elongated, inner margin grooved to accommodate pleopod 2 endopod.
Thegenus Amazoniscus comprises five speciesfrom Brazil: A. arlei Lemos de Castro, 1967 fromthestates of Amapá, Pará, Rio de Janeiroand Tocantins; A.eleonorae Souza et al., 2006 , A. leistikowi Campos-Filho, Araujo & Taiti, 2014 and A. zimmeri Campos-Filho, Montesanto &Araujo, 2017 fromthestateof Pará; and A. schmidti Campos-Filho, Montesanto &Araujo, 2017 fromthestateof Minas Gerais ( Souza et al. 2006; Campos-Filho et al. 2014, 2017a, 2018a). The genus is defined by having exoantennal or endoantennal conglobation, the cephalon with a frontal shield delimited superiorly by the frontal line and having a suprantennal line, pereonite 1 epimera without schisma, the antennal flagellum with two articles, the uropod protopod surpassing the telson and the male pleopod 1 exopod heart-shaped ( Schmidt 2007; Campos-Filho et al. 2014).
In lacking eyes and body pigment, and in having endoantennal conglobation, Amazoniscus spica sp. nov. is similar to A. eleonorae and A. leistikowi ; it differs from both in the shape of the exopod of the male pleopods 1 and 5 (for comparisons, see Souza et al. 2006: figs 1–19 and Campos-Filho et al. 2014: figs 23–25). This species is considered here as troglobiotic.
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