Cobososia reducta ( Wollaston, 1867 ) Telnov & Gompel, 2021

Telnov, Dmitry & Gompel, Nicolas, 2021, Review of Aderidae Csiki, 1909 (Insecta: Coleoptera) of Cabo Verde, Zootaxa 4963 (2), pp. 365-374 : 370-371

Cobososia reducta ( Wollaston, 1867) comb. nov.

( Figs. 1C, F, H & 2B )

Wollaston (1867: 221) original description, as Anthicus reductus .

Gemminger & Harold (1870: 2099) as Anthicus reductus , checklist.

Pic (1911: 70) as Anthicus reductus , checklist.

Uhmann & Geisthardt (1982: 195) as Anthicus reductus , checklist (“endemic?”), distribution (Santiago).

Geisthardt (1986: 76) misidentified records of C. feai (“S. Tiago: S. Jorge [dos Órgãos], XI.1982, XII.1982, 16.VIII.–30.IX.1983, 1.–15.IX.1983, XII.1983, II.1984 ”, mainly attracted to light, leg. A van Harten).

Geisthardt (1988: 198) Anthicus reductus , checklist (“endemic”), distribution (Santiago).

Geisthardt (1996: 91 & 106) as Anthicus reductus , checklist (“endemic”, considered extinct for unstated reason), distribution (Santiago).

Oromi et al. (2005: 78) as Anthicus reductus , checklist (“native, endemic, extinct”), distribution (Santiago).

Xylophilus angulithorax Desbrochers des Loges, 1881 syn. nov.

The new combination is based on the features of the studied ♂ holotype (see below), particularly the concave head base, trapezoidal shape of the pronotum with well-defined anterolateral angles, ovoid shape, generally pale colour of the body, and short, double elytral setation (cf. Báguena Corella 1962).

New synonymy: We compared C. reducta with a male specimen of Cobososia angulithorax (Desbrochers des Loges, 1881) , from Gibraltar ( Gompel et al. 2010), that was compared with the type of Xylophilus angulithorax Desbrochers des Loges, 1881 deposited at the MNHN. We could not find any significant differences between the specimens of C. reducta (as above) and the studied male Cobososia angulithorax (Desbrochers des Loges, 1881) , including in the shape and structure of the aedeagus, and the shape of the pronotum. Therefore, we conclude that Cobososia angulithorax (Desbrochers des Loges, 1881) is a junior synonym of Cobososia reducta ( Wollaston, 1867) syn. nov. Cobososia angulithorax (Desbrochers des Loges, 1881) was previously reported from the Mediterranean region ( Gompel et al. 2010).

Type material of C. reducta . holotype ♂ by monotypy ( BMNH): Holotype [printed, label circular, red framed] / Type [printed, label circular, red framed] / reductus, Woll. [handwritten] / CAPE VERDE IS. S.Iago T.V.Wollaston Coll. B.M. 1867-82 [printed] / Standing in Wollaston coll. as Anthicus reductus [printed] / HOLOTYPE Anthicus reductus Wollaston [handwritten] det.R.G.Booth 2015 [printed] / COBOSOSIA reducta (Woll.) comb. nov. det. D.Telnov, 2019 [printed].

New records. Republic of Cabo Verde, Santiago, São Jorge:. XII.1982, light trap, van Harten A. leg. (3 specimens, coll. SMNS) ,. II.1983, light trap, van Harten A. leg. (9 specimens, coll. SMNS) ,. IX.1983, light trap, van Harten A. leg. (2 specimens, coll. SMNS) ,. XI.1983, light trap, van Harten A. leg. (2 specimens, coll. SMNS) ,. XII.1983, light trap, van Harten A. leg. (1 specimen, coll. SMNS) ,. II.1984, light trap, van Harten A. leg. (1 specimen, coll. SMNS) ,. VIII.1984, suction trap, van Harten A. leg. (1 specimen, coll. SMNS) ,. XI.1984, suction trap, van Harten A. leg. (1 specimen, coll. SMNS) ,. I.1985, suction trap, van Harten A. leg. (3 specimens, coll. SMNS) .

Redescription. holotype ♂: Dorsum and venter uniformly pale orange. Head slightly darker, reddish-orange. Legs yellowish. Head glossy dorsally, with prominent compound eyes not extending towards base. Tempora distinct, eye length about 2.6x temporal length. Temporal angles rounded. Interfacetal setae short, inconspicuous. Head base slightly concave. Frons broad. Punctures of frons elongate, rather deep and sparse, intervening spaces about 2–4x as large as punctures on the disc but progressively smaller, with puncture nearly confluent near the basal margin. Antennomere 2 bead-shaped, 3 conical, both short, antennomeres 5–10 thicker, weakly conical, nearly as long as wide. Terminal antennomere asymmetrically conical, pointed, almost twice as long as penultimate antennomere. Pronotum slightly broader than head, glossy dorsally, broadly rounded on anterior margin (subtruncate medially), widest across acutely angulate anterolateral angles. Lateral margins of pronotum, slightly rounded and constricted towards the subtruncate base. Pronotal punctures circular, large, deep and dense, intervening spaces generally smaller than punctures. Pronotal setae whitish, rather long, not fully appressed. Elytra glossy dorsally, broadly cylindrical, with a rounded declivity in the posterior third (in lateral view). Dorsal punctures of elytra large, generally circular, intervening spaces smaller than to twice as large as punctures. Setae whitish, rather long, not fully appressed. Legs inconspicuous, prothoracic femora slightly arched on external margin. Aedeagus with phallobase and apicale separated by distinct constriction ( Fig. 2B ).

Sexual dimorphism. Female is unknown. Male prothoracic tibiae curved which may be a sex-specific feature as is commonly the case in Aderidae .

Note. This species is only distinguished from C. feai ( Pic, 1906) by the absence of a tooth on the inner surface of the male foretibia. Even the male genitalia of these two taxa have very similar conformations, with a characteristic broad and articulated phallobase. We cannot rule out, until we examine more material, that the tooth of the male foretibia is a variable character, and that C. feai ( Pic, 1906) is a junior synonym of C. reducta ( Wollaston, 1867) .

Distribution. Algeria, Morocco, Gibraltar and Sardinia, southern chain of Cabo Verde (São Tiago).

Figures

FIGURE 1. External morphology of Cabo Verde Aderidae species. A–D—Habitus, dorsal view: A—A. gravidicornis (Wollaston, 1867) ♂; B—C. pallescens (Wollaston, 1854) ♂ holotype; C—C. reducta (Wollaston, 1867) ♂; D—C. feai (Pic, 1906) ♂ holotype; E–G—Lateral outline of head, drawn from types, with arrow highlighting the distance from the eye to the posterior margin of the head: E—syntype ♀ A. gravidicornis; F—holotype ♂ C. reducta; G—holotype ♂ C. pallescens; H–I—♂ fore- tibia: H—C. reducta; I—C. feai. Scale bars: A–D—1 mm.

FIGURE 2. Male genitalia of Cabo Verde Aderidae species.A–C—Male genitalia in dorsal (left) and lateral (right) view:A—C. feai (holotype); B—C. reducta; C—C. pallescens (holotype). D—Male genitalia in dorsal view—A. gravidicornis, inset: outline of the distal apicale. Scale bars: 100 µm.