Cerhomalus quedenfeldti, Frolov & Akhmetova, 2021

Frolov, Andrey V. & Akhmetova, Lilia A., 2021, Taxonomic revision of the Afrotropical scarab beetle genus Cerhomalus Quedenfeldt, 1884 (Coleoptera: Scarabaeidae: Orphninae), European Journal of Taxonomy 739 (1), pp. 36-50 : 45-47

Cerhomalus quedenfeldti sp. nov.

urn:lsid:zoobank.org:act:AC2F5EC0-10F3-4262-A85E-F06B7B699139

Figs 4 , 5D , 6

Differential diagnosis

Cerhomalus quedenfeldti sp. nov. is similar to C. mechowi and C. petrovitzi sp. nov. in having the apices of the parameres with semi-circular excavations in apical view and with more or less developed fossae on ventral sides bordered with a keel, but can be separated from them in having the ventral fossae on the apices of the parameres not bordered proximally ( Fig. 4 G–K, arrowed) and the apices of the parameres in lateral view acute-angled ( Fig. 4D, H ).

Etymology

The new species is named after Friedrich Otto Gustav Quedenfeldt (1817–1891), a German coleopterist.

Type material

Holotype REPUBLIC OF THE CONGO • ♂; “Congo Brazzaville O.R.S.T.O.M. XI-1965 R. Paulian ”; MNHN.

Paratypes REPUBLIC OF THE CONGO • 1 ♂; “ Mai 1978 Voka Congo Coll. Th. Porion ”; MNHN; 6 ♀♀; “ Congo Brazzaville O.R.S.T.O.M. XI-1965 R. Paulian”; MNHN • 1 ♀; “ CONGO BRAZZAVILLE XI-57 / ORSOM PARIS MOUCHET 1957”; MNHN • 1 ♀; “Soil-Zoological Exp. Congo-Brazzaville Brazzaville ORSTOM / 18.10.1963 No 3 singled in park leg. Endrody-Younga”; HNHM • 1 ♂; “Soil-Zoological Exp. Congo-Brazzaville Brazzaville ORSTOM park / 16.1.1964 No 695 soil trap in forest leg. Balogh & Zicsi ”; HNHM • 1 ♀; “Soil-Zoological Exp. Congo-Brazzaville Brazzaville ORSTOM park / 22.12.1963 No 492 soil trap leg. Balogh & Zicsi ”; MHNG • 2 ♂♂, 3 ♀♀; “ Brazzaville Congo XI-1963 / MUSEUM PARIS Mission A. Descarpentiers et A. Villiers 1963-1964”; MNHN • 1 ♂; “Soil-Zoological Exp. Congo-Brazzaville Kindamba , Kimboukou river / 28.10.1963. No 38 singled on river side leg. Endrody-Younga ”; MHNG .

Description

Male, holotype ( Fig. 4 A–B, D–G)

Body length 19.8 mm. Colour uniformly brown to black.

Anterior margin of frontoclypeus somewhat rectangular, slightly convex in middle, bordered and slightly serrate in dorsal view ( Fig. 4A ). Frontoclypeus with a keel-shaped transverse process near anterior margin; height of keel about ¾ its width. Surface of frontoclypeus almost smooth, with minute punctures. Eye tubercles feebly developed. Eyes rather large: width about 1/6 distance between eyes in dorsal view. Antennae 10-segmented.

Pronotum widely rounded laterally, as wide as elytra. Anterior border wide. Basal border narrow, keelshaped, separated from pronotal disc by deep groove with row of longitudinally elongated punctures. Pronotal disc depressed, somewhat rugose anteriorly. Most of pronotum surface covered with minute punctures separated by more than 3 puncture diameters. Anterolateral angles with much larger and denser punctures; posteriolateral angles with same punctures but in smaller numbers.

Scutellum subtriangular, narrowly rounded apically, about 1/10 length of elytra.

Elytra 1.1 times longer than wide, with distinct humeral humps. Elytra widest in middle, lateral margins almost parallel in basal half. First (sutural) stria distinct, as groove with row of punctures. Other stria before humeral humps as rows of round setiferous punctures. Striae laterad of stria 5 feebly distinct. Elytral intervals covered with minute punctures, somewhat sparser than those on pronotum.

Macropterous.

Abdominal sternite 8 medially longer than sternites 6 and 7 combined; sternite 6 about as long as sternite 7. Pygidium invisible from above, with slightly truncate apex. Plectrum triangular with rounded apex, wider than long.

Aedeagus. Apices of parameres acute angled in lateral view ( Figs 4D, H , 5D ), with semi-circular excavations in apical view ( Fig. 4F, J ) and with more or less developed fossae on ventral sides not bordered proximally ( Fig. 4G, K ).

Female

Female ( Fig. 4C ) differs from male in having a relatively smaller, convex pronotum without tubercles, frontoclypeus with much smaller, low keel not bimodal apically, protibial spur, and pygidium with rounded apex.

Variation

Body length of examined male paratypes varies from 18.5 to 22.5 mm (males) and from 16.0 to 19.0 mm (females).

Distribution

The species is known from a few localities in the Republic of the Congo ( Fig. 6 ).

Figures

Fig. 4. Cerhomalus quedenfeldti sp. nov. A–B, D–G. Holotype, ♂ (MNHN). C. Paratype, ♀ (MNHN). H–K. Paratype, ♂ from Voka ♀ (MNHN). A, C. Habitus in dorsal view. B. Labels. D, H. Aedeagus in lateral view. E, I. Parameres in dorsal view. F, J. Parameres in apical view. G, K. Parameres in ventral view. Scale bars = 1.0 mm.

Fig. 5. Cerhomalus spp., scheme of aedeagus in lateral view and parameres in ventral view. A. C. absconditus (Petrovitz, 1971). B. C. mechowi Quedenfeldt, 1884. C. C. petrovitzi sp. nov. D. C. quedenfeldti sp. nov. Abbreviation: va. phlb. sc. = ventroapical phallobase sclerite. Not to scale.

Fig. 6. Cerhomalus spp., distributional record map.