Andersonoplatus castaneus, Linzmeier, Adelita M. & Konstantinov, Alexander S., 2018

Linzmeier, Adelita M. & Konstantinov, Alexander S., 2018, Andersonoplatus, a new, remarkable leaf litter inhabiting genus of Monoplatina (Coleoptera, Chrysomelidae, Galerucinae, Alticini), ZooKeys 744, pp. 79-138 : 87

Andersonoplatus castaneus sp. n. Figs 7, 8, 9

Description.

Body length 2.59-3.29 mm, width 1.45-1.78 mm, pronotum and elytra with very sparse, semi-erect hair, shiny, moderately convex in lateral view. Color brown to chestnut brown with a pearl luster; antennae and legs much lighter.

Head (Fig. 7B, D): slightly convex in lateral view, generally smooth with fine reticulation, gena with sparse pilosity. Frons and vertex forming nearly a 135° angle in lateral view. Antennal callus delimited from vertex by deep and slightly inclined supracallinal sulcus. Antennal callus raised, surface even, with no or two punctures, if bearing setae, they are short. Orbital sulcus deep. Supraorbital sulcus absent. Suprantennal sulcus deep. Suprafrontal sulcus absent. Frontolateral sulcus shallow. Frontogenal suture well developed. Subgenal suture well developed along base of mandible. Orbit narrower than transverse diameter of antennal socket. Interantennal space narrower than transverse diameter of eye and as wide as transverse diameter of antennal socket. Frontal ridge short and narrow. Eyes with nearly more than 20, small ommatidia. The last five antennomeres as long as sixth, slightly wider than preceding ones; second antennomere shortest (Fig. 7C).

Thorax: pronotum (Fig. 7A, B) much narrower than elytra, notched laterally below middle. Anterior margin wider than posterior, posterior margin slightly concave, lateral margin sinuated. Anterior angles pointed outward. Surface reticulated, with pilosity very short and sparse, lacking punctures. Pronotal disc weakly raised. Scutellum triangular. Prosternal surface reticulated. Prosternal intercoxal process narrow. Posterior end twice as wide as middle. Elytra weakly fused. Elytral surface shiny, with very sparse, white, semi-erect hairs, and a pearl luster. Punctures (Fig. 7A) forming nine striae (marginal stria consisting of one or two punctures). Elytral interspaces flat. Second and third striae reaching elytral base. Epipleura nearly vertical. Metafemur greatly enlarged, longer than wide and 1.76 times longer than metatibia. Claws simple and long.

Male genitalia (Fig. 8A): ventral side with longitudinal impression with bottom lacking transverse wrinkles, sides of impression form ridges. Apical denticle not developed in ventral view, apex bent ventrally.

Female genitalia (Fig. 8 B–G): tignum long, narrow, bent, with central canal; posterior area broad, sclerotization relatively well delineated; anterior area weakly widened (Fig. 8B). Vaginal palpi elongate, basally strongly sclerotized, each with approximately eight setae at apex (Fig. 8C). Palpi pointed at apex, enlarged at last third but thinned at apex, situated close together and merged anteriorly for more than half of their length. Spermatheca curved, with receptacle and pump not differentiated from each other. Apex of pump with spoon-like projection. Spermathecal duct short, widest at base, without coils (Fig. 8E).

Type material.

Holotype, ♂. VENEZUELA: Trujillo/ camino Viejo a Trujillo, Paramo/ La Cristalina, km 9.7, 2400m/ 09°21'21"N, 70°17'51"W / 20.V.1998-022C (MIZA). Paratypes (6♂ 5♀ USNM). Same label as holotype except: (1♂1♀ CMNC) “022D”; (1♂1♀ USNM) “022F”; (3♂2♀ USNM) “022J”; (1♀ CMNC) “022E”; (1♂ CMNC) "camino viejo a Trujillo/ km 6.0, 2240m/ 09°21'03"N, 70°17'36"W / E.Anderson, cloud for. litter".

Etymology.

The specific epithet is a noun in apposition based on the color of the beetles.

Differential diagnosis.

Andersonoplatus castaneus is similar to A. jolyi and can be differentiated from it based on the following characters: supracallinal sulci well developed, deep (Fig. 7D); apex of median lobe of aedeagus bent ventrally in lateral view (Fig. 8A).