Maladera thomsoni ( Brenske, 1894 )

Fabrizi, Silvia, Liu, Wan-Gang, Bai, Ming, Yang, Xing-Ke & Ahrens, Dirk, 2021, A monograph of the genus Maladera Mulsant & Rey, 1871 of China (Coleoptera: Scarabaeidae: Melolonthinae: Sericini), Zootaxa 4922 (1), pp. 1-400 : 137-138

Maladera thomsoni ( Brenske, 1894) group

Key to species of the Maladera thomsoni ( Brenske, 1894) group occurring in China (³³):

1 Body dark brown...................................................................................... 2

1’ Body yellowish brown.................................................................................. 5

2 Antennal club as long as remaining antennomeres combined. Anterior margin seen from posterior not or only wealky tridentate................................................................................................. 3

2’ Antennal club 1.2 times as long as remaining antennomeres combined. Anterior margin of labroclypeus strongly tridentate (posterior view)....................................................... Maladera subtruncata ( Fairmaire, 1887)

3 Left paramere with a blunt lateral extension beyond the middle............. Maladera jaintiaensis Ahrens & Fabrizi, 2016

3’ Left paramere without blunt lateral extension beyond the middle................................................ 4

4 Distal lobes of parameres narrow and straight. Paramere with basal lobe on the left side, basal lobe narrow......................................................................... Maladera pseudosenta Ahrens, Fabrizi & Liu , sp. n.

4’ Distal lobes of parameres strongly reflexed and bent. Paramere with basal lobe on the right side, basal lobe thick..................................................................................... Maladera senta ( Brenske, 1897)

5 Parameres (excluding basal lobe) as long or longer than phallobase.............................................. 6

5’ Parameres (excluding basal lobe) distinctly shorter than phallobase.............................................. 7

6 Parameres (excluding basal lobe) as long as phallobase. Basal lobe of left paramere robust and short............................................................................ Maladera guomenshanica Ahrens, Fabrizi & Liu , sp. n.

6’ Parameres (excluding basal lobe) distinctly longer than the phallobase. Basal lobe of left paramere narrower and long................................................................ Maladera hansmalickyi Ahrens, Fabrizi & Liu , sp. n.

7 Aedeagus with only one paramere with basal lobe........................................................... 9

7’ Aedeagus with both parameres having a basal lobe........................................................... 8

8 Both basal lobes sphaerically enlarged......................................... Maladera straminea ( Moser, 1915c)

8’ Only basal lobe of the left paramere sphaerically enlarged, the other one smaller, widened tubuliform......................................................................................... Maladera aureola ( Murayama, 1938)

9 Right paramere with basal lobe................................... Maladera juxianensis Ahrens, Fabrizi & Liu , sp. n.

9’ Left paramere with basal lobe........................................................................... 10

10 Apical branches of left and right paramere abruptly and tooth-like widened shortly before middle of parameres. Filiform extension of basal lobe circularly reflexed........................................... Maladera botrytibia Nomura, 1974

10’ Apical branches of left and right paramere not widened. Filiform extension of basal lobe straight..................... 11

11 Spherical basal lobe of left paramere positioned mesally and dorsal to apical phallobase. Distal lobe of left paramere widened, but without additional lateral convex extension......................... Maladera apicalis Ahrens, Fabrizi & Liu , sp. n.

11’ Spherical basal lobe of left paramere positioned laterally of apical phallobase. Distal lobe of left paramere narrow, but with an additional lateral convex extension.................................. Maladera kubeceki Ahrens, Fabrizi & Liu , sp. n.