Ochthebius hajeki sp. nov. from Socotra Island (Coleoptera: Hydraenidae) Author Jäch, Manfred A. Naturhistorisches Museum Wien, Burgring 7, A- 1010 Wien, Austria; e-mail: manfred. jaech @ nhm-wien. ac. at Author Delgado, Juan A. Departamento de Zoología, Facultad de Biología, Universidad de Murcia, 30100 Murcia, Spain; e-mail: jdelgado @ um. es text Acta Entomologica Musei Nationalis Pragae 2014 2014-12-30 54 115 119 journal article 10.5281/zenodo.5312168 0374-1036 5312168 6A72B4B9-FB47-4165-86D8-3654293F09D3N Ochthebius hajeki sp. nov. ( Figs 1–2 ) Type locality. Yemen , Socotra Island , Dixam Plateau, Firmihin, 12°28.6′N 54°01.1′E , 490 m a.s.l. ( Figs 3–4 ). Type material. HOLOTYPE : J ( NMPC ): ‘ YEMEN SOCOTRA ISLAND Dixam plateau 14.-15.vi.2012 FIRMIHIN, Dracaena woodland 12°28.6′N 54°01.1′E , 490 m’, ‘ SOCOTRA expedition 2012 J. Bezděk, J. Hájek, V. Hula, P. Kment, I. Malenovský, J. Niedobová & L. Purchart leg.’. PARATYPES : 42 specimens ( IBEB , NHMW , NMPC ): same locality label as holotype [ two paratypes kept in alcohol were sent to IBEB for future DNA-sequencing]. Fig. 1. Ochthebius hajeki sp. nov. , habitus, holotype. Scale bar: Fig. 2. Ochthebius hajeki sp. nov. , aedeagus, holotype (a) dorso-lateral view; (b) almost dorsal view; (c) strictly dorsal view of apex; (d) lateral view; (e) ventral view. Scale bar: 0.1 mm. Figs 3–4. Type locality of Ochthebius hajeki sp. nov. Arrows in Fig. 3 show the location of the microhabitat of O. hajeki sp. nov. (Photos J. Hájek). 0.4–0.5. Base of male tarsi with adhesive setae. Last abdominal tergite of female with fringe of bristles. Variability. The pronotal foveae are usually distinct, but on average not very deeply impressed; in one of the male paratypes the posterior ones are almost completely effaced. Differential diagnosis. Ochthebius hajeki sp. nov. is a member of the O. foveolatus subgroup (sensu JÄCH 1991 ). This subgroup consists of almost 30 species, which are more or less confined to the Palaearctic Realm ( JÄCH 1991 , DELGADO & JÄCH 2009 , JÄCH & DELGADO 2010 ). A few species are distributed along the northern fringe of the Oriental Region, e.g. in the Himalayas and in Taiwan . No species of this group has so far been recorded from the African continent south of the Sahara. Two species of the O. foveolatus subgroup occur in the Arabian Peninsula: O . innexus Balfour-Browne, 1951 , and O . harteni Jäch & Delgado, 2010 . These two species can be easily distinguished from the new species by the paler colouration and the aedeagi (see JÄCH 1991 : Fig. 21, and JÄCH & DELGADO 2010 : Figs 23–26). Etymology. Named for Jiří Hájek (NMPC), who collected the majority of the type specimens. Habitat. All specimens were collected in a hygropetric habitat, where a film of water was flowing over orange algae on travertine rock ( Figs 3–4 ). Limnebius dioscoridus was collected there as well, but it was also found in other microhabitats on the same rock. Distribution. So far known from one locality on Socotra Island , Yemen .