Tetraserica subrotundata, Fabrizi, Silvia, Dalstein, Vivian & Ahrens, Dirk, 2019

Fabrizi, Silvia, Dalstein, Vivian & Ahrens, Dirk, 2019, A monograph on the genus Tetraserica from the Indochinese region (Coleoptera, Scarabaeidae, Sericini), ZooKeys 837, pp. 1-155 : 67-68

Tetraserica subrotundata sp. n. Figures 29, 53

Type material examined.

Holotype: ♂ "Coll. I. R. Sc. N. B. Cambodia (Pursat Prov.) Phnom Samkos wild life Sanctuary, light trap Forest Edge & Primary 14-IV-2005 Leg. K Smets & I Var/ 903 Sericini Asia spec. " (ISNB). Paratypes: 1 ♂ "Coll. I. R. Sc. N. B. Cambodia, Pursat Prov. Phnom Samkos W.S. Pramaoy, forest edge, 13-IV-2005, Light Trap Leg. K Smets & I Var/ Sericini Asia spec. 905" (ZFMK), 1 ♂ "Coll. I. R. Sc. N. B. Cambodia, Pursat Prov. Phnom Samkos W.S. Pramaoy, forest edge, 13-IV-2005, Light Trap Leg. K Smets & I Var" (ISNB).

Description.

Length of body: 7.1 mm; length of elytra: 5.5 mm; maximum width: 4.8 mm. Surface of labroclypeus and disc of frons glabrous. Smooth area anterior to eye twice as wide as long. Eyes moderately large, ratio of diameter/interocular width: 0.57. Ratio of length of metepisternum/metacoxa: 1/1.83. Metatibia short and wide, ratio width/length: 1/3.15; basal group of dorsal spines of metatibia at first third of metatibial length.

Aedeagus: Fig. 29 A–C. Habitus: Fig. 29D.

Female unknown.

Variation.

Length of body: 7.1-8.1 mm; length of elytra: 5.5-5.8 mm; maximum width: 4.7-4.8 mm.

Diagnosis.

Tetraserica subrotundata sp. n. is rather similar to T. matsumotoi Kobayashi, 2017 in shape of the aedeagus; the new species differs by the right paramere being bent only once and being slightly wider in lateral view, and the apex of median phallobasal lamina strongly rounded instead of sharply pointed.

Etymology.

The name of the new species (adjective in nominative singular) is derived from the combined Latin prefix sub- (under) and adjective rotundatus (rounded), with reference to the shape of the medial apical phallobasal lamina of the aedeagus.