Dineutus (Protodineutus) arabicus Régimbart, 1907

Hájek, Jiří & Reiter, Antonín, 2014, Adephagous water beetles (Coleoptera: Gyrinidae, Haliplidae, Noteridae, Dytiscidae) of Yemen and Dhofar region (Oman) with description of a new Hyphydrus from Socotra Island, Acta Entomologica Musei Nationalis Pragae 54, pp. 63-99 : 78

Dineutus (Protodineutus) arabicus Régimbart, 1907

( Figs 27–28 )

Published records. GAHAN (1985: 286): Yemen (as? Dineutus aereus ); RÉGIMBART (1907: 142): Yemen (original description); data repeated by BALFOUR- BROWNE (1951: 195).

Type material. SYNTYPES: 1 J, ‘Type [round label with red margin, printed] // Hadramaut. [yellow underlined] / Arabia. / 94-235 [printed] // Dineutus / arabicus Rég. / n.sp. [Régimbart’s handwriting]’ ( BMNH); 1 ♀, ‘ ♀ [printed] // Hadramaut.[yellow underlined] / Arabia. / 94-235 [printed] // No [printed] 461 [handwritten] / examined by / Prof. Thaxter for / Laboulbeniaceae . [printed] // Dineutus / arabicus / co-type Rég. [handwriten]’ ( BMNH).

Notes. A species known only from the type series from Hadramaut.With apical margin of elytra not serrate, it is more similar to Oriental D. indicus Aubé, 1838 rather than D. aereus . However D. arabicus differs from both mentioned species in absence of postero-lateral elytral sinuation ( Fig. 27 ), deeply impressed elytral reticulation and different shape of male aedeagus ( Fig. 28 ).

Figures

Figs 27–29. 27–28 – Dineutus arabicus Régimbart, 1907: 27 – habitus of male syntype (12.5 mm); 28 – median lobe in ventral view. 29 – Dineutus sp. ♀ (Yemen, Jabal Bura) (15.0 mm). Not in scale.