Coccidula reitteri Dodge, 1938

Szawaryn, Karol, Nedved, Oldrich, Biranvand, Amir, Czerwinski, Tomasz & Nattier, Romain, 2021, Revision of the genus Coccidula Kugelann (Coleoptera, Coccinellidae), ZooKeys 1043, pp. 61-85 : 61

Coccidula reitteri Dodge, 1938 Figs 1F , 5A-E , 6A-C

Coccidula suturalis Reitter 1897: 127 nom. nud. (nec. C. suturalis Weise, 1895: 132).

Coccidula reitteri Dodge, 1938: 222.

Material examined.

Holotype. Russia, "Quell. d. Jrbut Reitter./ Transbaikal leg. Leder / Coll. Reitter / / Coccidula scutellaris m 1896/ Coccidula reitteri Dodge Khnzorian det./ prep. genital R. Bielawski 1956/ Holotypus 1897 Coccidula suturalis Reitter/ Photo ID: HNHM_COL_574", female (HNHM) . Other material. Russia, "Transbaikalien Leder Reitter/ Coccidula suturalis Rtt. Coll. Reitter / Coccidula reitteri Dodge, det. Merkl 1984/ prep. genital R. Bielawski 1956" (1 male: HNHM); Listvjanka pr. Bajkal, step, 29.6.1977, H. Karnecka lgt. (1 male, 1 female: NMP) .

Diagnosis.

Coccidula reitteri is very similar to C. rufa in external appearance, however, it can be distinguished by the presence of a small black transverse macula on the pronotum just anterior to the scutellar shield, and a longitudinal brown to black macula on the posterior half of the elytra on the elytral suture. Male genitalia are very close to C. rufa , however, the upper margin of the penis guide in lateral view is relatively less emarginated and parameres are narrower than in C. rufa .

Description.

Length = 2.8-3.2 mm, BL/BW = 1.85-1.90, EL/BW = 1.33, PW/BW = 0.77.

Body elongate, parallel sided (Fig. 5A ). Pronotum (Fig. 1F ) with black transverse macula in front of the scutellar shield. Scutellar shield black. Elytra brown with elongate, dark brown to black macula along the elytral suture in posterior half. Ventral side testaceous with prosternum, mesoventrite, metaventrite, most of the ventrite 1 (except lateral corners), and central part of ventrite 2 black.

Head and pronotum covered with uniform small setiferous punctures arranged irregularly. Pronotum (Fig. 5B ) transverse, broadly rounded laterally, with moderately broad, lateral margin without glabrous area; pronotum covered with dense setriferous punctures, with single row of larger punctures along lateral border. Posterior pronotal corners not produced (Fig. 5B ). Prosternum with anterior margin with bordering line incomplete in median part, without small sub-rounded impression in center. Prosternal process with lateral carinae straight, joined together roundly at level of anterior border of procoxae, forming sub-triangular pattern (Fig. 5C ).

Scutellar shield pentagonal, covered with dense setiferous punctures. Elytra covered with two types of punctures, small setiferous punctures irregularly distributed throughout the elytral surface, some of these punctures surrounded by larger depressed circles forming nine irregular longitudinal rows along whole length of elytra. Lateral elytral margin well visible throughout (Fig. 5A ). Mesoventrite with complete anterior border. Metaventrite with postcoxal lines descending laterally, fused on metaventral process in median part, forming continuous arc (Fig. 5D ); covered with setiferous punctures very sparsely distributed in central part of sclerite, densely setose in lateral parts, without distinct rows of large punctures below postcoxal lines, large punctures above metacoxae present.

Abdominal postcoxal lines complete, arcuate, reaching half of length of ventrite 1 measured below metacoxa. Ventrites covered with sparse setiferous punctures.

Male genitalia. Tegmen in inner view (Fig. 6B ) with penis guide broadly rounded in the median or apical part, with rounded apex; in lateral view (Fig. 6C ) moderately expanded medially, with upper surface moderately emarginate; long, much longer than parameres. Parameres elongate, parallel sided, with narrow base, inner surface smooth, with fringe of long setae in apical part. Penis simple with pointed apex, with small bump before apex.

Female genitalia. Spermatheca vermiform, not distinctly broadened apically (Fig. 6A ).

Type locality.

Mongolia, Russia (Krasnoyarsk region, Irkutsk region, Tuva)

Distribution.

Russia (East Siberia).

Remarks.

Coccidula reitteri is very similar to C. rufa in external morphological characters as well as the structure of male and female genitalia (Fig. 6A ) ( Bielawski 1984); thus, further investigation, preferably of molecular markers, should be conducted to confirm whether it is a separate species or an eastern population of C. rufa .

Figures

Figure 1. Immature stages and habitus of adult species of Coccidula Kugelann A C. rufa larva B C. rufa pupa C C. lepida, dorsal D C. lepida, ventral E C. litophiloides F C. reitteri G C. rufa H C. scutellata A, B Gilles San Martin, Wikimedia Commons C, D Danny Haelewaters G, H Udo Schmidt. Scale bars: 1 mm (C-H).

Figure 5. Coccidula reitteri Dodge SEM illustrations, HNHM A body, dorsal B pronotum C head and prothorax, ventral D meso and metaventrite E antenna. Scale bars: 1 mm (A); 500 µm (B-D); 300 µm (E).

Figure 6. Coccidula reitteri Dodge A original drawings of male and female genitalia by Bielawski 1984 B tegmen, inner C tegmen, lateral. Scale bar: 500 µm (B, C).