Mastostethus mulier, Rodríguez-Mirón, 2019

Rodríguez-Mirón, Geovanni M., 2019, A new species of Mastostethus (Coleoptera: Chrysomeloidea: Megalopodidae) from Chiapas, Mexico, Zootaxa 4691 (1), pp. 93-96 : 93-95

Mastostethus mulier sp. nov.

( Figs 1 , 2 , 3a )

Type. Holotype (female): Mex. St. of Chiapas, 1.7 mi. N. Ixhuatan, 10-VII-65, 1700’, D. R. Paulson // Mastostethus sp., det R. White ( FSCA).

Differential diagnosis Mastostethus mulier sp. nov. is distinguished from M. duplocinctus Clark, 1866 , by the following characters: Elytral lateral edge rounded, apex of pygidium rounded ( Fig. 2b ) and the spermathecal shape; spermathecal capsule boomerang-shaped, with velum; stem as long as proximal part of spermathecal capsule, with ornaments ( Fig. 3a ). Terminal portion coiled and notably long. In M. duplocinctus the elytral lateral edge is flattened, the apex of pygidium has a prominence; proximal part of spermathecal capsule is very elongated, without velum, the stem and terminal portion are shorted ( Fig. 3b ).

Description. Length = 10.5 mm, width = 5.0 mm. Head, pronotum, prosternum, and metaventrite red; elytra yellow with one humeral and apical stripe and two spots in middle part; antennae, scutellum, tibiae and tarsi black, abdomen orange; femora red with black spot; inter-ocular space with a black spot, pronotum with five spots ( Fig.1 ).

Head: Occiput coarsely and densely punctate, inter-ocular space sparsely punctate; clypeus trapezoid, punctate with erect pubescence laterally, posterior region translucent; labrum semicircular, surface sparsely pubescent, edge densely pubescent; antennae reaching pronotal edge posteriorly, antennomeres I–IV subcylindrical with sparse long setae, V–XI strongly flattened and widened, densely pubescent ( Fig. 1c ).

Thorax: Pronotum broader than long, trapezoidal, base wider than the anterior portion, pronotal disc slightly convex, punctures small, sparse, posterior angles slightly acute, posterior edge sinuate, with a ridge in the middle part and lateral depressions ( Fig. 2a ). Scutellum subtriangular, rounded at apex, sparsely punctate, pubescence short; elytral humeri truncate, projecting antero-laterally; elytra laterally slightly widened from humeri to posterior third, then convergent to suture, lateral edge rounded; disc convex, shiny, finely punctate and pubescent; metaventrite sparsely punctate and pubescent; metaepisternum with anterior portion concave, finely punctate and pubescent, posterior portion glabrous. Hind femora clavate, tibiae with erect pubescence; tibiae subcylidrical, with one dorsal row of denticles, hind tibiae curved slightly.

Abdomen: Pygidium sparsely punctate and pubescent, apex rounded ( Fig. 2b ); last abdominal ventrite concave, apex sinuate ( Fig. 2c ). Spermatheca boomerang-shaped, proximal part of spermathecal capsule with velum. Stem as long as proximal part of spermathecal capsule, with ornaments, terminal portion coiled and notably long ( Fig. 3a ).

Male. Unknown.

Distribution. Mexico: Chiapas

Etymology. The specific name is proposed because the only specimen of the species is a female; from the Latin mulier = woman.

Figures

FIGURE 1. Mastostethus mulier sp. nov. a) dorsal habitus; b) lateral habitus; c) head.

FIGURE 2. Mastostethus mulier sp. nov. a) pronotum; b) pygidium; c) last abdominal ventrite.

FIGURE 3. Spermatheca, a) Mastostethus mulier sp. nov.; b) Mastostethus duplocinctus.