Tetraserica microfurcata, 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 : 58

Tetraserica microfurcata sp. n. Figures 23, 49

Type material examined.

Holotype: ♂ "Laos, 1-16.V.1999, Louangpharabang pr., 23°33-4'N, E102°14'E, Ban Song Cha (5km W), 1200 m, Vít Kubáň leg./ coll. P. Pacholátko” (CPPB). Paratypes: 1 ♂ "Vietnam: Cuc phong, Ninh binh, 3-10.V.1966 Exp. Gy. Topál / Nr. 268 beaten from bushes near creek" (ZFMK), 1 ♀ "Vietnam: Cuc phong, Ninh binh, 3-10.V.1966 Exp. Gy. Topál / Nr. 252 singled material" (HNHM), 1 ♂ "Vietnam: Cuc phong, Ninh binh, 6-18.V.1966 Topál / Nr. 387 from trap in soil" (HNHM).

Description.

Length of body: 8.6 mm; length of elytra: 6.5 mm; maximum width: 5.3 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: 1/1.38. Metatibia moderately long and wide, ratio width/length: 1/3.43; basal group of dorsal spines of metatibia at first third of metatibial length.

Aedeagus: Fig. 23 I–K. Habitus: Fig. 23L.

Female unknown.

Variation.

Length of body: 7.6-8.6 mm; length of elytra: 5.5-6.5 mm; maximum width: 4.5-5.3 mm.

Diagnosis.

Tetraserica microfurcata sp. n. differs from the similar T. microspinosa sp. n. by the weakly curved, long and filiform left paramere, which is split in apical quarter into two fine branches, as well as the short and slim right paramere being strongly bent at middle.

Etymology.

The name of the new species (adjective in nominative singular) is derived from the combined Greek and Latin words micros (small) and furcatus (forked), with reference to the superficial split of the left paramere into two filiform branches.