Microserica viridicollis, Arrow, 1913

Ahrens, Dirk, Liu, Wangang, Lukic, Daniel & Bai, Ming, 2023, A taxonomic review of Microserica Brenske, 1894 from continental Asia (Coleoptera: Scarabaeidae: Melolonthinae: Sericini), Zootaxa 5241 (1), pp. 1-115 : 54-55

Microserica viridicollis group

Key to the species of the Microserica viridicollis group:

1 Apex of left paramere widely membraneous mesally. Punctation of pygidium in female sparse and superficial, surface finely microreticulate, without distinct micropunctures............................................................. 2

- Apex of left paramere not membraneous mesally............................................................. 3

2 Antennal club of male composed of 7 antennomeres. Colour generally yellowish brown........ Mic. heptaphylla Frey, 1972

- Antennal club of male composed of 5 or 6 antennomeres, rarely with 6 antennomeres with the 4 antennomere transversely produced. Colour generally black. ...................................................... Mic. thai Ahrens, 2002

3 Antennal club of male composed of 5 or 6 antennomeres...................................................... 4

- Antennal club of male composed of 7 antennomeres.......................................................... 8

4 Antennal club of male composed of 6 antennomeres.......................................................... 5

- Antennal club of male composed of 5 antennomeres. Body colour sometimes bicoloured, black with brown elytra. Pygidium with fine micropunctures......................................................... Mic. viridicollis Arrow, 1913

5 First lamella of club only half as long as the club. Carina of hypomeron strongly produced ventrally. Body uniformly blackish............................................................................................. 6

- All lamella of club of the same length...................................................................... 7

6 Surface of pygidium in female weakly shiny, finely microreticulated (visible at 100x magnification) and micropunctate.................................................................................... Mic. nigra ( Brenske, 1898)

- Surface of pygidium in female strongly shiny, without microreticulation (visible at 100x magnification).................................................................................................. Mic. affinis Arrow, 1946

7 Carina of hypomeron not produced ventrally. Right paramere small.......................... Mic. feae ( Brenske, 1898)

- Carina of hypomeron strongly produced ventrally. Right paramere relatively large........... Mic. biapoensis Ahrens, 2002

8 Surface of pygidium in female shiny, finely micropunctate (visible at 100x magnification), microreticulation only very superficial........................................................................................... 9

- Surface of pygidium in female with distinct microreticulation (visible at 100x magnification)........................ 10

9 Left paramere apically strongly widened, phallobase wide (in dorsal view). Dorsal surface uniformly black......................................................................................... Mic. thagatana ( Brenske, 1898)

- Left paramere almost not widened apically, phallobase narrow (in dorsal view). Dorsal surface yellowish brown or blackish......................................................................... Mic. phanrangensis Ahrens, 2002

10 Aedeagus moderately long, dorsally strongly curved................................... Mic. globulosa Moser, 1915

- Aedeagus long and narrow, dorsally weakly curved......................................................... 11

11 Antennal club 1.3 times as long as remaining antennomeres combined. Metatarsomere 1 as long as dorsal metatibial spur............................................................................... Mic. benomensis Ahrens, 2002

- Antennal club only little longer than remaining antennomeres combined. Metatarsomere 1 a quarter of its length longer than dorsal metatibial spur.......................................................... Mic. singaporeana Moser, 1921