Globopactes mucuyensis Campos-Filho, Paoletti & Taiti, 2021

Campos-Filho, Ivanklin Soares, Paoletti, Maurizio Guido, Gavinelli, Federico & Taiti, Stefano, 2021, New species and records of the family Scleropactidae Verhoeff, 1938 from Venezuela (Crustacea, Isopoda, Oniscidea), Tropical Zoology 34 (2), pp. 102-122 : 114-117

Globopactes mucuyensis Campos-Filho, Paoletti & Taiti n. sp.

Figures 9 -11

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Type material

VENEZUELA: Holotype ♂ ( MZUF 9860 ), La Mucuy , department of Mérida, 2,300 m a.s.l., 14.V.1976, leg. M. G. Paoletti. Paratypes: 3 ♀♀ (one with parts in micropreparations), 3 juvs ( MZUF 9860 ), same data as holotype ; 1 ♂ (parts in micropreparations), many juvs ( MZUF 9861 ), same locality and collector, 14.II.1996 ; 1 ♀ ( MZUF 9862 ), same as previous, leaf litter, in Eucalyptus wood .

Description

Maximum body length: ♂ 5 mm, ♀ 6 mm. Color brown, cephalon, pereonites 1-7 epimera and median portion, pleon, telson and uropods strongly pigmented; pereonites 1- 7 with unpigmented spots on paramedian portion. Body ( Figure 9A,E ) strongly convex with endoantennal conglobation; pereonite 1 epimera enlarged, anterior corners directed frontwards, not surpassing eyes; pereonites 2-7 subquadrangular and directed backwards; pleonites 3-5 epimera subquadrangular, continuing pereonites outline. Dorsal surface of cephalon, pereon, pleon and telson with small rounded tubercles bearing fringed triangular scale-setae ( Figure 9 A-E). One line of small noduli laterales per side inserted on posterior margins and at same distance from lateral margins of pereonites. Cephalon ( Figure 9 C-E) with X-shaped depression on vertex; transverse dorsal furrow, almost reaching posterior part of eyes; frontal line delimiting frontal shield superiorly; frontal shield slightly directed frontwards, median portion with slightly depression in frontal view, upper corners laterally slightly protruding not covering eyes; eyes of about 20 ommatidia. Telson ( Figure 9F ) triangular with distal margin rounded. Antennula ( Figure 9G ) of three articles, distal article conical with apical tip, three lateral aesthetascs plus apical pair. Antenna ( Figure 9H ) stout, not surpassing pereonite 1 when extended backwards; flagellum of three articles; apical organ as long as second and third articles together, bearing two short free sensilla. Buccal pieces as in Globopactes cristalinae n. sp. Pereopods 1-7 stout, merus, carpus and propodus bearing strong setae apically cleft with long sensilla on sternal margin; dactylus of two subequal claws, ungual seta longer than outer claw and apically simple, dactylar seta much longer than outer claw and apically plumose. Uropod ( Figure 10A ) protopod subrectangular fitting gap between pleonite 5 and telson, exopod as long as endopod, endopod inserted proximally and bearing fringe of thin setae on outer margin. Pleopod 1 and 2 exopods with respiratory areas on outer margin.

Male: Pereopods 1 and 2 ( Figure 10B,C ) merus and carpus with large fields of scales. Pereopod 7 ( Figure 10D ) ischium bearing fringe of scales on sternal margin, merus with proximal concave depression and proximal lobe on sternal margin. Pleopod 1 ( Figure 10E ) exopod triangular; endopod almost three times as long as exopod, distal part bearing line of small setae near inner margin. Pleopod 2 ( Figure 10F ) exopod triangular, outer margin concave bearing one seta; endopod slightly longer than exopod. Pleopod 3 and 4 exopods as in Figure 10G, H . Pleopod 5 exopod ( Figure 10I ) triangular with transverse fringes of thin setae, outer margin sinuous bearing one seta.

Etymology

The new species is named after La Mucuy, where the specimens were collected.

Remarks

In having the dorsal surface tuberculate, Globopactes mucuyensis n. sp. resembles G. cristalinae n. sp. and G. hispidus. It differs from both in having the cephalon with an X-shaped depression on vertex, dorsal furrow not covered by frontal shield, frontal shield slightly directed frontwards, and the male pereopod 7 merus with a proximal lobe on sternal margin.

Figures

Figure 9. Globopactes mucuyensis n. sp. from La Mucuy, ♀ paratype: A, dorsal habitus; B, dorsal scale-seta; C, cephalon, dorsal view; D, cephalon, frontal view; E, cephalon and pereonite 1, lateral view; F, pleonites 4 and 5, telson and uropods: G, antennula; H, antenna.

Figure 10. Globopactes mucuyensis n. sp. from La Mucuy, ♀ paratype: A, uropod. ♂ paratype: B, pereopod 1; C, pereopod 2; D, pereopod 7; E, pleopod 1; F, pleopod 2; G, pleopod 3 exopod; H, pleopod 4 exopod; I, pleopod 5 exopod.