Sericini, Kirby, 1837

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 : 7-8

Key to Sericini genera and species groups with multi-lamellate antennal club from continental Asia:

1 Hypomeron not carinate................................................................................ 2

- Hypomeron carinate................................................................................... 3

2 Dorsal margin of metatibia carinate. Dorsal surface generally unicoloured reddish brown or dark brown................................................................................................ Tetraserica Ahrens, 2004

- Dorsal margin of metatibia longitudinal convex. Dorsal surface generally multicoloured, yellowish brown with darker spots................................................................................ Microserica avicula group

3 Antennal club in female composed of 3 antennomeres........................................................ 4

- Antennal club in female composed of more than 3 antennomeres 1 .............................................. 34

4 Posterior margin of metafemur ventrally and dorsally serrate................................................... 5

- Posterior margin of metafemur ventrally smooth............................................................ 14

5 Anterior angles of pronotum obsolete.................................................................... 12

- Anterior angles of pronotum acute and moderately produced................................................... 6

6 Antennal club in male with four antennomeres.............................................................. 9

- Antennal club in male with five antennomeres. Metatibia without longitudinal serrated line beside dorsal margin......... 8

- Antennal club in male very long and strongly reflexed, with five or seven antennomeres. Metatibia with a longitudinal serrated line beside dorsal margin............................................................................... 7

7 Antennal club in male with seven antennomeres.............................. Microserica septemfoliata ( Frey, 1972)

- Antennal club in male with five antennomeres.............. Microserica planiforceps Ahrens, Lukic & Liu, new species

8 Elytra with multiple dark spots. Dorsal surface moderately convex. Apical border of elytra with a fine membraneous rim of microtrichomes....................................... Neoserica longwangshanica Ahrens, Fabrizi & Liu, 2019 *

- Elytra without multiple dark spots, if multicolored with larger-scale color pattern but no small dark spots. Dorsal surface strongly convex. Apical border of elytra without a membraneous rim....................... Microserica simplex group

9 Dorsal surface more or less glabrous. Anterior angles of pronotum moderately produced............................ 10

- Dorsal surface densely setose........................................................................... 11

10 Apical border of elytra with a fine membraneous rim of microtrichomes........................ Neoserica calva group

- Apical border of elytra without a membraneous rim...... Gastroserica ( Helioserica Ahrens, Lukic & Liu , new subgenus)

11 Metatibia beside dorsal margin in basal half with a serrated longitudinal line or carina..................................................................................... Neoserica jianfenglingica Ahrens, Fabrizi & Liu, 2019 *

- Metatibia beside dorsal margin without a serrated longitudinal line or carina................................................................................................ Neoserica gracilisetosa Ahrens, Fabrizi & Liu, 2019 *

12 Dorsal surface nearly glabrous......................................... Gastroserica (sensu stricto) Brenske, 1897

- Dorsal surface densely setose........................................................................... 13

13 Metatibia beside dorsal margin with a serrated longitudinal line or carina......... Neoserica (sensu stricto) Brenske, 1894

- Metatibia beside dorsal margin without a serrated longitudinal line or carina................. Calloserica Brenske, 1894

14 Dorsal margin of metatibia longtidunally convex, not carinate. Aedeagus with the left paramere almost entirely reduced, the dorsoapical emargination of phallobase between the parameres extremely deep, it exceeds at least the half of the phallobasal length....................................................... Moronoserica Ahrens, Lukic & Liu, new genus

- Dorsal margin of metatibia carinate. Phallobase different, parameres never reduced................................ 15

15 Metatibia beside dorsal margin with a serrated longitudinal line or carina........................................ 16

- Metatibia beside dorsal margin without a serrated longitudinal line or carina..................................... 19

16 Metatibia with one group of robust spines. ............................................ Lasioserica Brenske, 1896

- Metatibia with two groups of robust spines................................................................ 17

17 Frons dull....................................................................... Neoserica silvestris group

- Frons in anterior two thirds shiny, without toment........................................................... 18

18 Metafemur beside anterior margin with a continuous serrated line. Aedeagus and parameres symmetric, phallobase without lateral apophysis............................................. Neoserica jinpingica Ahrens, Fabrizi & Liu, 2019 *

- Metafemur beside anterior margin without a continuous serrated line. Aedeagus asymmetric, phallobase with a long, right lateral apophysis. ...................................... Neoserica anmaxinzhaiensis Ahrens, Fabrizi & Liu, 2019

19 Antennal club in males long and reflexed................................................................. 20

- Antennal club in males short, or moderately long and straight................................................. 22

20 Antennal club in male with five antennomeres....................................... Anomalophylla Reitter, 1887

- Antennal club in male with four antennomeres.............................................................. 21

21 Phallobase asymmetric.............................................................. Neoserica dianae group

- Phallobase symmetric....................................................... Neoserica funiushanensis group*

22 Protibia bidentate.................................................................................... 23

- Protibia tridentate................................................................... Trioserica Moser, 1922

23 Elytra bicolored, yellowish or reddish brown and black...................................................... 24

- Elytra unicolored.................................................................................... 27

1 If female specimens were unknown*, we treated those taxa in the key as if antennal club in the female was composed of 3 antennomeres.

24 Phallobase subsymmetrical......................................................26 ( Oxyserica Brenske, 1900 )

- Phallobase strongly asymmetrical........................................................................ 25

25 Phallobase tubuliform, weakly curved (lateral view); phallobasal apodeme at base elongate. . Microserica viridicollis group

- Phallobase stout and short, strongly curved (lateral view); phallobasal apodeme at base not extended........................................................................................... Microserica quadrimaculata group

26 Parameres including their dorsal lobes symmetrical. Pygidium in females often shiny and impunctate................................................................................................. Oxyserica pygidialis group

- Parameres including their dorsal lobes strongly asymmetrical. Pygidium in females dull and normally punctate......................................................................................... Oxyserica marginata group

27 Apex of metatibia shallowly truncate at interior apex near tarsal articulation...................................... 28

- Apex of metatibia sharply truncate at interior apex near tarsal articulation........................................ 33

28 Dorsal surface yellowish brown to reddish brown, strongly and simply shiny................... Neoserica lubrica group

- Dorsal surface dull or iridescently shiny.................................................................. 29

29 Elytra glabrous or with fine setae only. Metatibia sharply carinate along dorsal margin............................. 30

- Elytra with single scale-shaped setae. Metatibia longitudinally convex along dorsal margin.................................................................................. Neoserica costisquamosa Ahrens, Fabrizi & Liu, 2019 *

30 Antennal club in male with four antennomeres............................................................. 31

- Antennal club in male with six antennomeres.................... Neoserica menglaensis Ahrens, Fabrizi & Liu, 2019 *

31 Labroclypeus nearly semi-circular. Metatibia wide and short.................................................. 32

- Labroclypeus subrectangular. Metatibia narrow and long.................................... Neoserica vulpes group

32 Phallobase strongly asymmetric. Metatarsomere 1 as long as dorsal metatibial spine...................................................................................... Neoserica xingdoushanana Ahrens, Fabrizi & Liu, 2019 *

- Phallobase symmetric. Metatarsomere 1 distinctly longer than dorsal metatibial spine........................................................................................ Neoserica yanshanica Ahrens, Fabrizi & Liu, 2019 *

33 Pronotum and elytra always almost glabrous............................................................................................................................ Sericania Motschulsky, 1860 (see also couplet 39)

- Pronotum and elytra always distinctly setose......................................... Gynaecoserica Brenske, 1896

34 Labrum without a transverse rim of very dense, short, and robust setae.......................................... 35

- Labrum short, with a transverse rim of very dense, short, and robust setae. Dorsal surface densely setose................................................................................................ Neoserica pilosula group

35 Metatibia slender and long............................................................................. 41

- Metatibia short and wide.............................................................................. 36

36 Body smaller 8.5 mm .............................................................. Neoserica obscura group

- Body larger 9 mm .................................................................................... 37

37 Antennal club composed in male and female of 4 antennomeres............................................... 38

- Antennal club composed in male of more than 4 antennomeres...... Neoserica multifoliata group (species from Indochina)

38 Aedeagus asymmetric................................................................................. 39

- Aedeagus symmetric..................................................... Neoserica insubida ( Brenske, 1898)

39 Base of labroclypeus not covered with dull toment. Parameres entirely fused with phallobase to a uniform but gently narrowed tube............................................................................. Neoserica majori group

- Base of labroclypeus covered with dull toment............................................................. 40

40 Parameres partly fused with phallobase, at least one paramere separate from phallobase. ........ Neoserica uniformis group

- Parameres normal, not fused with phallobase........................ Neoserica martinui Ahrens, Fabrizi & Liu, 2019

41 Antennal club of males with 7 antennomeres............................................................... 42

- Antennal club of males with 6 or less antennomeres......................................................... 43

42 Metafemur with a continuously serrated line adjacent to the anterior margin of metafemur. Protibia distinctly tridentate............................................................................. Neoserica septemlamellata group

- Metafemur without a continuously serrated line adjacent to the anterior margin of metafemur. Protibia always distinctly bidentate......................................................................... Nepaloserica Frey, 1965

43 Basis of labroclypeus dull. Antennal club of males with 6 antennomeres......................................... 44

- Antennal club of males with 5 or 4 antennomeres........................................................... 45

44 Angle between basis of hypomeron and that of pronotum strongly rounded, angle between surfaces of hypomeron and pronotum basally blunt. Hypomeron basally strongly produced ventrally and transversely sulcate. ...... Lepidoserica Nikolajev, 1979

- Angle between basis of hypomeron and that of pronotum sharp, angle between surfaces of hypomeron and pronotum sharp. Hypomeron basally not produced ventrally and not sulcate................................ Neoserica abnormis group

45 Apex of metatibia shallowly truncate at interior apex near tarsal articulation...................................... 46

- Apex of metatibia deeply truncate at interior apex near tarsal articulation..... Sericania Motschulsky, 1860 (see couplet 26)

46 Body surface strongly shiny. Body smaller (5.7–6.6 mm).................................. Neoserica speciosa group

- Body surface dull. Body larger (8 mm).............................................. Chrysoserica Brenske, 1897