Venezillo dioi Campos-Filho, Araujo & Taiti, 2023

Campos-Filho, Ivanklin Soares, Sfenthourakis, Spyros, Gallo, Jéssica Scaglione, Gallão, Jonas Eduardo, Torres, Dayana Ferreira, Chagas-Jr, Amazonas, Horta, Lília, Carpio-Díaz, Yesenia Margarita, López-Orozco, Carlos Mario, Borja-Arrieta, Ricardo, Araujo, Paula Beatriz, Taiti, Stefano & Bichuette, Maria Elina, 2023, Shedding light into Brazilian subterranean isopods (Isopoda, Oniscidea): expanding distribution data and describing new taxa, Zoosystema 45 (19), pp. 531-599 : 583

Venezillo dioi Campos-Filho, Araujo & Taiti , n. sp.

( Figs 41-43 ; 49B )

urn:lsid:zoobank.org:act:498666A4-9867-465B-AEDB-49D0DC77C399

TYPE MATERIAL. — Holotype. Brazil • ♂ (parts in micropreparations); Gruna Bem Bom cave, Carinhanha , state of Bahia; 13°35’03.3”S, 43°57’51.2”W, 692 m a.s.l.; 28.XI.2015; M. E. Bichuette & J. E. Gallão leg.; LES 28010 .

ETYMOLOGY. — The new species is named after Diocleciano Pereira Pinto Neto, also known as Dió, who assures the preservation of the Gruna Bem Bom cave.

DESCRIPTION

Body length: 5 mm. Color brown with typical muscle spot insertions. Body in lateral view as in Figure 41A . Cephalon and pereonite 1 with low bosses, pereonites 2-7 and pleon smooth; dorsal surface bearing semicircular scale-setae ( Fig. 41B ). One line of small noduli laterales per side, inserted near posterior margins ( Fig. 41A ). Cephalon ( Fig. 41 C-F) with rectangular frontal shield slightly protruding above eyes in frontal view, slightly bent backwards above vertex, not protruding above vertex, suprantennal line absent; eyes with about 15 ommatidia. Pereonite 1 epimera with rounded lateral margins, anterior corner directed frontwards, schisma on posterior corners, ventral and dorsal lobes of schisma rounded, ventral lobe slightly shorter than outer lobe, lateral margin grooved for entire length; pereonite 2 epimera with ventral lobe obliquely directed outwards, not surpassing outer margin of epimeron; pereonite 2-4 epimera with rounded lateral margin, 5-7 subquadrangular ( Fig. 41A , G-J).Pleonite 3-5 epimera subrectangular, well developed; telson hour-glass shaped, proximal part wider than distal one, distal margin straight ( Fig. 41K, L ). Antennula ( Fig. 41M ) of three articles, proximal and distal articles similar in length, distal article bearing about six aesthetascs. Antenna ( Fig. 41N ) short and stout, distal article of peduncle longer than flagellum; flagellum of two articles, distal article about twice as long as proximal one, bearing two lateral aesthetascs; apical organ short bearing two sensilla. Mandibles with molar penicil semidichotomized, left mandible ( Fig. 42A ) with 2+1 penicils, and right mandible ( Fig. 42B ) with 1+1 penicils. Maxillula ( Fig. 42C ) inner endite with two transverse penicils, distal margin rounded; outer endite of 4+6 teeth, all simple, accessory tooth on outer set. Maxilla ( Fig. 42D ) inner lobe rounded covered with thick setae; outer lobe about twice as wide as inner lobe, rounded and covered with thin setae. Maxilliped ( Fig. 42E ) basis subrectangular; proximal article of palp with two setae distinct in length; endite subquadrangular, medial seta surpassing distal margin, outer margin rounded, distal margin bearing two short triangular setae. Uropod ( Fig. 43A ) protopod subrectangular, flattened, inner margin concave, endopod inserted proximally, exopod short, inserted dorsally on slight protuberance. Pereopod 1 ( Fig. 43B ) carpus with transverse antennal grooming brush; pereopod 7 ( Fig. 43C ) ischium with sternal margin straight; dactylus with inner claw reaching median portion of outer claw, dactylar and ungual setae simple, not surpassing outer claw. Genital papilla ( Fig. 43D ) with slender and triangular ventral shield, two subapical orifices. Pleopod exopods with monospiracular covered lungs. Pleopod 1 ( Fig. 43E ) exopod triangular, about twice as wide as long, medial margin rounded, outer margin sinuous, distal margin triangular; endopod three times as long as exopod, distal portion slightly bent outwards and bearing short setae. Pleopod 2 ( Fig. 43F ) exopod triangular, outer margin distinctly concave bearing few short setae; endopod flagelliform, longer than exopod. Pleopod 3-5 exopods as in Figure 43 G-I.

REMARKS

Within the Neotropical Venezillo , only four species have eyes composed of 15 ommatidia, namely V. galapagoensis ( Miers, 1877) from the Galápagos Islands ( Ecuador), V. jamaicensis ( Richardson, 1912) from Jamaica, V. osorioi ( Mulaik, 1960) from Mexico, and V. ramsdeni ( Boone, 1934) from Cuba. Venezillo dioi Campos-Filho, Araujo & Taiti , n. sp. differs in having the cephalon and pereonite 1 with low bosses (vs entire surface tuberculated in V. galapagoensis and V. jamaicensis , entire surface smooth in V. osorioi and V. ramsdeni ), and pereonite 1 epimera grooved on entire length (vs half length in V. galapagoensisi and V. jamaicensis , one quarter of length in V. osorioi and V. ramsdeni ) (see Van Name 1936).

The cave where the specimens were collected is located in the Brazilian xeric region of Caatinga ( Morrone et al. 2022). This species is considered to be a troglophile due to the absence of troglomorphic characteristics.

Figures

FIG. 41. — Venezillo dioi Campos-Filho, Araujo & Taiti, n. sp., male holotype, LES 28010: A, lateral habitus; B, scale-seta; C, cephalon and pereonites 1 and 2, frontal view; D, cephalon, back view; E, cephalon, frontal view; F, cephalon, dorsal view; G, pereonite 1 epimeron, dorsal view; H, pereonite 1 epimeron, ventral view; I, pereonite 2 epimeron, dorsal view; J, pereonite 2 epimeron, ventral view; K, pleonites 3-5, telson, and uropods, dorsal view; L, telson; M, antennula; N, antenna. Scale bar: A, 1 mm.

FIG. 42. — Venezillo dioi Campos-Filho, Araujo & Taiti,n. sp., male holotype, LES 28010: A, left mandible;B, right mandible;C, maxillula; D, maxilla; E, maxilliped.

FIG. 43. — Venezillo dioi Campos-Filho,Araujo & Taiti,n. sp.,male holotype,LES 28010:A, uropod; B, pereopod 1; C, pereopod 7; D, genital papilla;E, pleopod 1; F, pleopod 2; G, pleopod 3 exopod; H, pleopod 4 exopod; I, pleopod 5 exopod.

FIG. 49. — Distribution map of Porcellionides pruinosus (Brandt, 1833). Abbreviations of states: BA, Bahia; MG, Minas Gerais.