Nesocyrtosoma curvum Hopp and Ivie

Hopp, Katie J. & Ivie, Michael A., 2009, A Revision Of The West Indian Genus Nesocyrtosoma Marcuzzi (Coleoptera: Tenebrionidae), The Coleopterists Bulletin (mo 8) 63, pp. 1-138: 68-69

publication ID 10.1649/0010-065x-63.sp8.1

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scientific name

Nesocyrtosoma curvum Hopp and Ivie

New Species

Nesocyrtosoma curvum Hopp and Ivie   , New Species

( Figs. 69 View Figs , 230–233 View Figs , 268 View Figs , 300 View Figs )

Type Material. HOLOTYPE: Male. PUERTO RICO; Maricao Forest , 890m,;  

28–30-VII-2004; G.Nearns, beating. ( FSCA)   .

Diagnosis. This species can be distinguished from all other species by the combination of the shining bronze color, impressed elytral striae ( Fig. 230 View Figs ), absence of a hypomeral bead, antennomeres 6–10 enlarged, presence of an ocular depression, intercoxal process of first ventrite without apical nipple ( Fig. 233 View Figs ), the presence of a weakly impressed dorsal longitudinal groove on the tibiae, and the anterior angles of the pronotum acute, moderately produced, and narrowly rounded ( Fig. 232 View Figs ). It is nearly identical to N. bankense   and N. puertoricense   , but can be distinguished from those by the above characters and the male metatibia. The male metatibia of N. curvum   is broad and abruptly emarginate at the apex without a ventral tooth ( Fig. 69 View Figs ), whereas the male metatibia of N. bankense   and N. puertoricense   are slender and evenly curved at the apex with a ventral tooth ( Figs. 63, 64 View Figs ).

Description (male). 3.5 mm long, 2.3 mm wide. Small, moderately convex, elytra widest in apical half, tapered at apex ( Figs. 230, 231 View Figs ). Shining bronze; antennae, mouthparts, and tarsi ferrugineous. Head densely variably punctate; largest punctures larger than a single eye facet, weakly to moderately impressed; extremely short golden seta emerging from each puncture. Antenna clavate, antennomeres 6–10 weakly widened, forming a loose club; apical antennomere subcircular; antennomeres 6–11 with stellate sensoria. Mentum with weak acute median keel anteriorly raised to a point ( Figs. 10, 12 View Figs ). Ventral portion of eye not reaching subgenal sulcus ( Fig. 8 View Figs ); ventral ocular groove present ( Fig. 191 View Figs ); postgena without distinct punctures. Dorsal surface of pronotum densely punctate; punctures separated by 0.5–1.0 diameters. Pronotal marginal bead complete laterally, anterior margin with marginal bead effaced medially, posterior margin without marginal bead; anterior angles of pronotum acute, moderately produced and narrowly rounded apically; lateral edge of pronotum evenly curved to base; pronotum evenly convex ( Fig. 232 View Figs ). Hypomeron without distinct punctures. Prosternal process apically rounded, with indistinct marginal grooves opposite coxae not joined apically ( Fig. 233 View Figs ). Elytral striae deeply impressed, present as rows of small punctures separated by 0.5–1.0 3 diameter, with a deeply impressed line through middle of puncture rows, connecting the row of punctures; elytral interstriae roundly convex, scarcely punctate, shagreened; scutellary striae 3 punctures long; scutellum triangular, normal ( Figs. 230, 232 View Figs ). Mesoventrite broad antero-posteriorly, U-shaped, excavate, receiving prosternal process; metaventrite subequal to antero-postero length of mesocoxa ( Fig. 233 View Figs ). Metathoracic wing fully developed. Legs short, punctate; femora barely reaching beyond edge of elytra; tibiae with indistinct dorsal longitudinal groove, metatibia abruptly emarginate at apex with small serrations in the emarginate portion ( Fig. 69 View Figs ). Abdominal depressions on 4th and 5th ventrites reduced to indistinct slits ( Fig. 74 View Figs ); intercoxal process of the first ventrite apically rounded; ventral surface densely punctate, punctures moderately impressed ( Fig. 232 View Figs ).

Female. Unknown.

Biology. This species has been collected by beating vegetation at 890 m.

Distribution. This species is endemic to Puerto Rico. It has been collected in the Maricao Forest in west-central Puerto Rico ( Fig. 268 View Figs ).

Etymology. The species epithet comes from the Latin word curvus meaning curved or bowed, referring to the male metatibia as it is abruptly emarginate or curved near the ventral apex ( Fig. 69 View Figs ).


Florida State Collection of Arthropods, The Museum of Entomology