Amaladera (Omaladera), Reitter, 1896

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 : 41-42

Maladera (subgen. Omaladera Reitter, 1896 )

Omaladera Reitter, 1896: 188 (type species by subsequent designation: Amaladera diffinis Reitter, 1896 ; Ahrens 2004b); Ahrens 2004b: 207; 2006d: 1; 2007c: 21.

Cephaloserica Brenske, 1900: 79 (type species by subsequent designation: Serica carinirostris Brenske, 1896: 153 ; Yu et al. 1998); Brenske 1902: 1, 62, syn. n.

Coronoserica Brenske, 1902: 2 (type species by monotypy: C. beata Brenske, 1902 ), syn. n.

Remarks. According to the currently available phylogenetic hypothesis ( Eberle et al. 2017), Omaladera is nested within Cephaloserica species. The proposed key character of Cephaloserica , e.g. the reduced size of the basal apodeme of the phallobase and the elongated tubular phallobase, appear to be either plesiomorphic or had multiple origins in this clade. Thus, Omaladera renders Cephaloserica polyphyletic, and we synonymize Cephaloserica with Omaladera here.

Key to species of Maladera (sbg. Omaladera ) occurring in China (³³):

1 Basal apodeme of phallobase shortened, equal to about 1/5 of phallobase length. Phallobase tube-like................. 17

1’ Basal apodeme of phallobase not shortened, equal to about half of phallobase length. Phallobase not tube-like............ 2

2 Base of labroclypeus narrowly covered with dull toment..................................................... 10

2’ Base of labroclypeus without dull toment................................................................... 3

3 Anterior margin of metafemur with a fine, adjacent and continuously serrate line................................... 4

3’ Anterior margin of metafemur without fine, adjacent serrate line................................................ 7

4 Right paramere weakly bent at middle ( Fig. 10C ).............................. Maladera lignicolor ( Fairmaire, 1887)

4’ Right paramere strongly bent at middle (e.g., Fig. 9D )........................................................ 5

5 Left paramere straight, bent dorsally at apex............................. Maladera hajeki Ahrens, Fabrizi & Liu , sp. n.

5’ Left paramere bent ventrally............................................................................. 6

6 Left paramere as long as the right, evenly narrowed towards pointed apex............. Maladera cariniceps (Moser, 1915)

6’ Left paramere distinctly shorter than the right, with a large ventral teeth before apex.................................................................................................. Maladera weni Ahrens, Fabrizi & Liu , sp. n.

7 Body size larger, 11 mm or greater........................................................................ 9

7’ Body size smaller, <10 mm ............................................................................. 8

8 Disc of frons setose................................................... Maladera orientalis ( Motschulsky, 1858)

8’ Disc of frons glabrous...................................... Maladera guangdongana Ahrens, Fabrizi & Liu , sp. n.

9 Metatibia widest at middle. Setae on head robust and long. Right paramere long, only little shorter than phallobase............................................................... Maladera guomenshanensis Ahrens, Fabrizi & Liu , sp. n.

9’ Metatibia widest at apex. Setae on head fine and short. Right paramere shorter, equals only 1/3 of phallobasal length............................................................................. Maladera clypeata ( Fairmaire, 1887)

10 Left and right parameres subequal in length............................................................... 11

10’ Right paramere distinctly longer than the left one. Left paramere strongly curved.................................. 12

11 Parameres and phallobase rather narrow.................................................................. 13

11’ Right paramere and phallobase rather robust. Left paramere straight. Right paramere distinctly concave ventrally ( Fig. 10K )................................................................ Maladera enigma Ahrens, Fabrizi & Liu , sp. n.

12 Right paramere narrow, only half as wide as phallobase at apex. Left paramere short, not exceeding basal half of the right one.................................................................... Maladera diversipes ( Moser, 1915b)

12’ Right paramere wide, as wide as phallobase at apex. Left paramere long, distinctly exceeding basal half of the right one............................................................................. Maladera infuscata ( Moser, 1915b)

13 Phallobase narrowed towards apex (dorsal view)........................................................... 15

13’ Phallobase at apex as wide as at middle (dorsal view)........................................................ 14

14 Right paramere fused basally with the phallobase. Left paramere straight...... Maladera riberai Ahrens, Fabrizi & Liu , sp. n.

14’ Right paramere separate basally from the phallobase. Left paramere strongly curved................................................................................................ Maladera xingkei Ahrens, Fabrizi & Liu , sp. n.

15 Right paramere weakly curved externally. Left paramere after base strongly bent, after basal extension abruptly filiform................................................................. Maladera anhuiensis Ahrens, Fabrizi & Liu , sp. n.

15’ Right paramere straight. Left paramere weakly curved, after basal extension gently and evenly narrowed............... 16

16 Left paramere at apex abruptly bent ventrally. Right paramere dorsally sclerotised in apical half................................................................................ Maladera dahongshanica Ahrens, Fabrizi & Liu , sp. n.

16’ Left paramere at apex straight. Right paramere dorsally not sclerotised but membraneous in apical half........................................................................... Maladera shiniushanensis Ahrens, Fabrizi & Liu , sp. n.

17 Aedeagus apically 90º clockwise rotated, right parameres thus appears to be inserted ventrally, the left dorsally.......... 19

17‘ Aedeagus apically not rotated, paramere both insert in lateral positions.......................................... 18

18 Body yellowish to reddish brown. Right paramere not widened dorsally................ Maladera cardoni (Brenske, 1896)

18’ Body dark brown. Right paramere strongly widened dorsally............................. Maladera fusca (Frey, 1972)

19 Phallobase long and narrow............................................................................ 20

19’ Phallobase shorter and very robust, wide at middle.............................. Maladera masumotoi Nomura, 1974

20 Right paramere inclinated in right angle to longitudinal axis of phallobase. Colour of body reddish brown. Body smaller 10 mm ................................................................................................ 21

20’ Right paramere straight, in line with longitudinal axis of phallobase main. Colour of body brown or dark brown. Body larger 10 mm ............................................................................................. 25

21 Right paramere bent with its main surface internally, mesal side not visible in apical view........................... 22

21’ Right paramere not bent with its main surface internally, mesal side visible in apical view.................................................................................................... Maladera ovatula ( Fairmaire, 1891)

22 Right paramere not convexly widened ventrally, but straight................................................... 23

22’ Right paramere convexly widened ventrally............................................................... 24

23 Left paramere angled, in basal half much wider than in apical half................. Maladera verticalis ( Fairmaire, 1888 b)

23’ Left evenly curved, in basal half not much wider than in apical half.................. Maladera formosae ( Brenske, 1898)

24 Left paramere strongly evenly curved, in basal half strongly widenend, with a large blunt tooth in the centre of the curvation.......................................................................... Maladera sontica ( Brenske, 1898)

24’ Left paramere weakly unevenly curved, in basal half only little widenend, with a blunt tooth only at the very base............................................................................... Maladera perniciosa ( Brenske, 1898)

25 Phallobase much elongated, ratio width/ length: 1/5 (lateral view). Body dark brown............................... 27

25’ Phallobase less elongated, ratio width/ length: 1/4 (lateral view). Body reddish brown.............................. 26

26 Right paramere wide at base, sharply pointed at apex, abruptly narrowed (lateral view) at middle. Left paramere atrongly curved over its entire length................................... Maladera businskyorum Ahrens, Fabrizi & Liu , sp. n.

26’ Right paramere moderately wide at base, nearly rounded at apex, weakly narrowed (lateral view) at middle. Left paramere nearly straight, only weakly curved at apex.................... Maladera wuliangshanensis Ahrens, Fabrizi & Liu , sp. n.

27 Right paramere wide at base, narrowed behind base and before apex.. Maladera pseudohongkongica Ahrens & Fabrizi, 2016

27’ Right paramere at middle as narrow as at base, abruptly narrowing only shortly before apex......................... 28

28 Dorsal margin of right paramere concave (lateral view)...................................................... 29

28’ Dorsal margin of right paramere weakly convex (lateral view)................................................. 30

29 Right paramere shorter and reflexed, emargination on dorsal margin before apex deeper................................................................................................... Maladera hongkongica ( Brenske, 1898)

29’ Right paramere longer and straight, emargination on dorsal margin before apex shallow............................................................................................. Maladera juntongi Ahrens, Fabrizi & Liu , sp. n.

30 Right paramere tubular in apical half, pointed apex very short............... Maladera yibini Ahrens, Fabrizi & Liu , sp. n.

30’ Right paramere parabolic in apical half, pointed apex long.................. Maladera johannesi Ahrens & Fabrizi, 2016

Figures

FIGURE 9. A–E: Maladera hajeki Ahrens, Fabrizi & Liu, sp. n. (holotype); F–I: M. clypeata (Fairmaire, 1887) (Vietnam: Sa Pa); J–M: M. guomenshanensis Ahrens, Fabrizi & Liu, sp. n. (holotype). A, F, J: aedeagus, left side lateral view; D, H, L: aedeagus, right side lateral view; B, G, K: parameres, dorsal view; C: parameres, dorsal view; E, I, M: habitus. Scale: 0.5 mm. Habitus not to scale.

FIGURE 10. A–D: Maladera lignicolor (Fairmaire, 1887) (holotype Autoserica tenebrosa Frey, 1972); E–H: M. orientalis (Motschulsky, 1858) (lectotype); I–L: M. enigma Ahrens, Fabrizi & Liu, sp. n. (holotype). A, E, I: aedeagus, left side lateral view; C, G, K: aedeagus, right side lateral view; B, F, J: parameres, dorsal view; D, H, L: habitus. Scale: 0.5 mm. Habitus not to scale.