Amiserica costulata (Frey)

Ahrens, Dirk, Liu, Wangang, Pham, Phu Van & Fabrizi, Silvia, 2021, An overview on the genus Amiserica Nomura, 1974 (Coleoptera: Scarabaeidae: Melolonthinae: Sericini), Zootaxa 5050 (1), pp. 1-63 : 59-60

Amiserica costulata (Frey) group

Checklist of the species:

Amiserica breviflabellata Ahrens, 2004 a: 136 .

Amiserica costulata (Frey, 1969) : 518 ( Lasioserica ).

Amiserica krausei Ahrens, 2004 a: 130 .

Amiserica longiflabellata Ahrens, 2004 a: 134 .

Amiserica patibilis Ahrens, 2004 a: 137 .

Amiserica recurva Ahrens & Fabrizi, 2009b: 258 .

Amiserica surda Ahrens, 2004 a: 139 .

Amiserica taplejungensis Ahrens, 2004 a: 133 .

Key to species of the Amiserica costulata (Frey) group (♂♂)

1 Metasternum caudally strongly elevated, medially concave; with concavity very finely and densely punctate and densely erectly setose. Serrated line of metatibia widely interrupted and incomplete........................................... 2

- Metasternum caudally flat, not elevated, median concavity longitudinal and weak, not more densely punctate than the rest of the metasternum. Serrated line of metatibia complete......................................................... 5

2 Lateral margins of pronotum strongly curved. Left paramere strongly widened, interiorly with a sharp tooth........................................................................................ A. taplejungensis Ahrens, 2004

- Lateral margins of pronotum moderately curved. Left paramere narrow, interiorly without tooth....................... 3

3 Left paramere strongly shortened, its basal lobe wider; basal lobe of right paramere distinctly longer.................................................................................................... A. krausei Ahrens, 2004

- Left paramere at maximum only little shorter than the right one, its basal lobe narrower; basal lobe of right paramere distinctly shorter.............................................................................................. 4

4 Left paramere nearly subequal in length to the right one........................... A. recurva Ahrens & Fabrizi, 2009

- Left paramere little shorter than the right one............................................ A. costulata (Frey, 1969)

5 Protarsal claws symmetrical. Antennal club much longer than remaining antennomeres combined................................................................................................ A. longiflabellata Ahrens, 2004

- Protarsal claws asymmetrical, interior claw hook-like developed. Antennal club not longer than remaining antennomeres combined............................................................................................... 6

6 Anterior margin of labroclypeus not reflexed, its anterior angles strongly rounded, anterior margin slightly concavely sinuate medially................................................................... A. breviflabellata Ahrens, 2004

- Anterior margin of labroclypeus strongly reflexed........................................................... 7

7 Eyes larger (ratio diameter/interocular width: 0.88). Anterior margin of labroclypeus separated by an indistinct incision from the lateral margin of clypeus. Parameres shorter and wider................................... A. surda Ahrens, 2004

- Eyes smaller (ratio diameter/interocular width: 0.67). Anterior margin of labroclypeus separated by a distinct incision from the lateral margin of clypeus. Parameres narrow and long..................................... A. patibilis Ahrens, 2004