Tetraserica dongnaiensis, 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 : 47-48

Tetraserica dongnaiensis sp. n. Figures 18, 47

Type material examined.

Holotype: ♂ "Museum Leiden Viet Nam (Dong Nai Prov.) Cát Tiên N.P.: along Dong trail, 9.iv-19.v.2007. Leg. C. van Achterberg, R. de Vries, E. Gassó, Miracle & Nguyen Than Mahn/ humid lowland forest; in malaise traps; 250 m. 11°26'20.6"N, 107°25'42"E / 960 Sericini Asia spec." (RMNH). Paratypes: 4 ♂♂ "Museum Leiden Viet Nam (Dong Nai Prov.) Cát Tiên N.P.: along Dong trail, 9.iv-19.v.2007. Leg. C. van Achterberg, R. de Vries, E. Gassó, Miracle & Nguyen Than Mahn/ humid lowland forest; in malaise traps; 250 m. 11°26'20.6"N, 107°25'42"E " (RMNH, ZFMK), 2 ♂♂ "Museum Leiden Viet Nam (Dong Nai Prov.) Cát Tiên N.P.: along Dong trail, 1.iv-13.v.2007. Leg. May Phu Quy, Nguyen Than Mahn/ humid lowland forest; in malaise traps; 250 m, 11°26'20.6"N, 107°25'42"E " (RMNH).

Description.

Length of body: 10 mm; length of elytra: 7.5 mm; maximum width: 6.4 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: 0.62. Ratio of length of metepisternum/metacoxa: 1/1.61. Metatibia short and wide, ratio width/length: 1/2.36; basal group of dorsal spines of metatibia at first third of metatibial length.

Aedeagus: Fig. 18 A–C Habitus: Fig. 18D.

Female unknown.

Variation.

Length of body: 9.1-10.5 mm; length of elytra: 6.9-7.9 mm; maximum width: 5.8-6.8 mm.

Diagnosis.

Tetraserica dongnaiensis sp. n. differs from all other Tetraserica species that have long median phallobasal lamina with simple left and simple right parameres at base (without brush of spines), by the left paramere being split behind basal third into two filiform branches, and the right paramere being short and curved.

Etymology.

The new species is named with reference to its occurrence in the Dong Nai province (adjective in the nominative singular).