Tetraserica nussi, 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 : 72

Tetraserica nussi sp. n. Figures 31, 49

Type material examined.

Holotype: ♂ "Cambodia 3. Cardamom Mts., near Cham Kar Chhrey, 12°20'N, 103°01'E, 350 m, Dry Riverine in evergreen forest, 6.iii.2000, leg. M. Nuss/ Staatl. Museum für Tierkunde Dresden/ 119 Sericini Asia spec." (SMTD). 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" (ZFMK), 1 ♂ "Coll. I. R. Sc. N. B. Cambodia, Pursat prov. Phnom Samkos W.S. Pramaoy Forest Edge 15-IV-2005, Light Trap Leg. K. Smets & I. Var" (ISNB), 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: 8 mm; length of elytra: 5.8 mm; maximum width: 5.4 mm. Surface of labroclypeus and disc of frons glabrous. Smooth area anterior to eye twice as wide as long. Eyes small, ratio of diameter/interocular width: 0.54. Ratio of length of metepisternum/metacoxa: 1/1.68. Metatibia moderately long and wide, ratio width/length: 1/3.38; basal group of dorsal spines of metatibia at first third of metatibial length.

Aedeagus: Fig. 31 I–K. Habitus: Fig. 31L.

Female unknown.

Variation.

Length of body: 8.0-8.1 mm; length of elytra: 5.7-5.8 mm; maximum width: 4.9-5.4 mm.

Diagnosis.

Tetraserica nussi sp. n. is very similar to T. subrotundata sp. n. in shape of aedeagus, but differs by the much shorter parameres and median phallobasal lamina; the dorsal lobe of left paramere is as long as the ventral one (and not shorter as in T. subrotundata ) and the apex of phallobase is strongly asymmetric (dorsal view).

Etymology.

The new species is named after one of its collectors, M Nuss (noun in genitive singular).