Sybrinus commixtus Gahan, 1900

Hájek, Jiří & Kabátek, Petr, 2012, Synonymical notes on the genus Sybrinus from Socotra Island (Coleoptera: Cerambycidae: Lamiinae), Acta Entomologica Musei Nationalis Pragae 52, pp. 365-372 : 369

Sybrinus commixtus Gahan, 1900

( Figs. 1 , 7–9 )

Sybrinus commixtus Gahan, 1900: 13 (original description); GAHAN (1903): 286 (description); AURIVILLIUS (1922): 299 (catalogue); NEUMANN et al. (2004): 139 (notes); ADLBAUER (2010): 227 (catalogue).

Sybrinus sp. : GAHAN (1903): 287 (notes).

Sybrinus commixtus var. Gahani Aurivillius, 1922: 299 (description by indication to GAHAN 1903: 287).

Sybrinus (Sybrinus) commixtus: BREUNING (1949) : 21 (notes).

Sybrinus (Arabosybrinus) commixtus: TÉOCCHI et al. (2007) : 21 (redescription).

Type material. Sybrinus commixtus : LECTOTYPE: ♀, by present designation ( BMNH), labelled: ‘Type [p] / ♀ [hw] [rounded label with red margin] // Adho Dimellus, / Sokotra. [p] / 3500-4500 [hw] feet. [p] / 1-17 [hw].Feb. 99. / W.R.O.Grant. / 99–85. [p] // Sybrinus / commixtus / Gahan ♀ / ♀ Type [hw] // LECTOTYPE ♀ / SYBRINUS / commixtus Gahan, 1900 / J. Hájek & P. Kabátek des. 2011 [p, red label]’.

Sybrinus commixtus var. gahani : HOLOTYPE: ♀ ( BMNH), labelled: ‘Type [p, rounded label with red margin] // Jena–agahan, / Sokotra. / 1200 [hw] feet.[p] /.Jan 99. / W.R.O.Grant. / 99–85. [p] // S. commixtus / v. Gahani Auriv. [hw] / det. K.G.Blair [p] // HOLOTYPE ♀ / SYBRINUS / commixtus / var. gahani Aurivillius, 1922 / J. Hájek & P. Kabátek des. 2011 [p, red label]’.

Additional material examined. SOCOTRA ISLAND: 9 spec., Hadiboh env., 12°65′02″N, 54°02′04E, 10–100 m, 21.xi.–12.xii.2003, P. Kabátek leg. ( PKCP); 5 spec., same data, but D. Král leg. ( NMPC); 7 spec., 10 km W Hadibo, 10–70 m, 23.xi.+ 11.xii.2003, P. Kabátek leg. ( PKCP); 1 spec., Suq env., 12°40′02″N, 54°03′45″E, 20–170 m, sand dune, 22.xi.2003, P. Kabátek leg. ( PKCP); 6 spec., wadi Ayhaft , 12°36′38″N, 53°58′49″E, 190 m, 24.–26.xi.2003, P. Kabátek leg. ( PKCP); 1 spec., Lahas (pass), 12°38′46″N, 54°05′26″E, 69 m, P. Kabátek leg.( PKCP); 2 spec., Homhil protected area, 12°34′27″N, 54°18′32″E, 364 m, 28.–29.xi.2003, P. Kabátek leg. ( PKCP); 1 spec., Homhil area, 12°34′25″N, 54°18′53″E, 400–510 m, at light, 9.–10.ii.2010, L. Purchart & J. Vybíral leg. ( NMPC); 3 spec., Dixam plateau, wadi Esgego, 12°28′09″N, 54°00′36″E, 300 m, 2.–3.xii.2003, P. Kabátek leg. ( PKCP); 1 spec., Firmihin plateau, 12°28′46″N, 54°00′89″E, 400–500 m, 18.–19.vi.2010, V. Hula & J. Niedobová leg. ( NMPC) .

Comments on classification. The number and depositary of syntypes of S. commixtus is unknown. For that reason we here designate a lectotype to fix the identity of this species.

TÉOCCHI et al. (2007) suggested synonymy of Sybrinus commixtus and S. albosignatus Breuning, 1948 described from Yemen (‘Aden’). We have compared Socotran material with the type of S. albosignatus [badly damaged, lacks head and prothorax] deposited in MNHN, as well with large recently collected material from several localities in Yemen. The two species are closely related and may represent subspecies of one taxon or even synonyms. However, small differences between insular and continental populations can be detected: The apex of elytra is less prominent and obtusely rounded, and the surface setation is usually denser and generally paler in S. albosignatus ( Fig. 2 ). Therefore we prefer to retain both taxa as separate species.

Bionomic notes. Sybrinus commixtus is a polyphagous species reared from number of trees and bushes in Socotra Island: Adenium obesum socotranum (Vierhapper) Lavranos (Apocynaceae) ; Boswelia ameero Balf.f. ( Burseraceae ); Cephalocroton socotranum Balf. f., Euphorbia arbuscula Balf. f., Jatropha unicostata Balf. f. ( Euphorbiaceae ); Sterculia africana socotrana (K. Sch.) Abedin et al. (Malvaceae) ; Acacia pennivenia Schweinf. (Fabaceae) . Adults are frequently collected at light.

Figures

Figs. 1–6. Habitus of Sybrinus. 1 – Sybrinus commixtus Gahan, 1900 (Hadibo; 11 mm); 2 – S. albosignatus Breuning, 1948 (Yemen, wadi Sari; 11 mm); 3 – S. simonyi Gahan, 1903 J (W of Hadibo; 10 mm); 4 – S. simonyi ♀ (W of Hadibo; 10 mm); 5 – S. x-ornatus Téocchi, Jiroux & Sudre, 2007 (Scant Mt.; 12 mm); 6 – S. x-ornatus (holotype; 14 mm).

Figs. 7–15. Male genitalia of Sybrinus. 7–9. Sybrinus commixtus Gahan, 1900; 10–12. S. simonyi Gahan, 1903; 13–15. S. x-ornatus Téocchi, Jiroux & Sudre, 2007. 7, 10, 13 – median lobe in dorsal view; 8, 11, 14 – same in lateral view; 9, 12, 15 – parameres.