Tetraserica quadriforceps, 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 : 45-46

Tetraserica quadriforceps sp. n. Figures 17, 51

Type material examined.

Holotype: ♂ "Vietnam N 1989 Tam Dao 12-24.5. Vinh Phu prov. Stranad Jan leg." (ZFMK). Paratypes: 1 ♂ "Coll. I. R. Sc. N. B. C Vietnam, Tam Dao N.P. 21°31'N 105°33'E, 25-30.vii.2011, Malaise trap, Leg. J: Costant & J. Bresseel, I.G.: 31.933, GTI project" (ISNB), 1 ♂ "N-Vietnam (Tonkin) pr. Vinh Phu, Tam Dao. 6-9.V.1990 Vít. Kubáň leg."/ Coll. Milan Nikodým, Praha/ 726 Sericini Asia spec." (ZFMK), 1 ♂ "N. Vietnam, 900 m Tam Dao 13-24.5 1989 A. Olexa/ Fereiwilliger Museumsverain (Basel) 1989" (NHMB), 1 ♂ "N-Vietnam, (Tonkin) Tamdao 12-24.5.1989 PACHOLÁTKO leg./ coll. P. Pacholátko / VS21/ 242 Sericini Asia spec." (CPPB), 1 ♂ "Vietnam, Tam dao 27.5.-2.6.1986 Vinh phu prov. Jan Horák lgt." (NHMB), 2 ♂♂ "N-Vietnam 5-10.VI.1989 Tam Dao Brantlová lgt." (NHMB), 1 ♂ "N. Vietnam: Vinh Phu prov., Tam Dao 900 m, 14.V.1962 leg. O. Kabakov" (ZIN).

Description.

Length of body: 9.9 mm; length of elytra: 7 mm; maximum width: 6.1 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: 0.65. Ratio of length of metepisternum/metacoxa: 1/1.26. Metatibia short and wide, ratio width/length: 1/2.6; basal group of dorsal spines of metatibia at first third of metatibial length.

Aedeagus: Fig. 17 A–D. Habitus: Fig. 17E.

Female unknown.

Variation.

Length of body: 8.0-9.9 mm; length of elytra: 6.2-7.0 mm; maximum width: 5.0-6.1 mm.

Diagnosis.

Tetraserica quadriforceps sp. n. differs from all other Tetraserica species with a median lamina of the phallobase that is longer than the half-length of phallobase (but not exceeding the length of it), and by the right paramere having a comb of short spines at base. The shape of aedeagus resembles that of T. changshouensis Liu et al., 2014, but the medial phallobasal lamina is much shorter and the apex of the right paramere less strongly widened.

Etymology.

The species name (noun in apposition) is derived from the combined Latin prefix quadri (four) and forceps, with reference to the four branches of the parameres.