Hyphoporus Sharp, 1880 n

Fery, Hans, 2017, A new classification of the tribe Hygrotini Portevin, 1929 (Coleoptera: Dytiscidae: Hydroporinae), Zootaxa 4317 (3), pp. 499-529 : 521

Subgenus Hyphoporus Sharp, 1880 n . stat.

Type species: Hydroporus solieri Aubé, 1838: 554 , by monotypy.

The subgenus Hyphoporus contains 19 species distributed in the Oriental and Palaearctic regions (see Fig. 2 and Table 1).

Diagnosis. Body shape short oval (TL/MW ca. 1.6–1.7), rather globose; small to medium sized species (TL 3.5–5.6 mm) (see Fig. 18 for H. (Hyphoporus) solieri ). Head with anterior clypeal margin truncate, straight or slightly emarginated, border not produced forwards; bead continuous, middle part narrowed in most species (see Fig. 42 for H. (Hyphoporus) solieri ); (eXcept H. (Hyphoporus) bengalensis (Severin, 1890) with continuous bead). Antennomeres simple, not broadened. Elytra with margin in lateral view moderately ascending to shoulder (similar to Fig. 55 ); epipleuron comparably broad, broader than mesotibia distally; carina meeting inner margin of epipleuron forming a comparably small angle (<ca. 135°; similar to Fig. 50 ). Elytra with interrupted vittae or dotted (in some species very darkened); venter black or brown. Last abdominal ventrite without deep depression. Aedeagus with median lobe robust, asymmetric (see Fig. 28 for Hygrotus (Hyphoporus) tonkinensis (Régimbart, 1899) ; in H. bengalensis median lobe more or less symmetric; see Vazirani 1969 for several further figures); parameres with condylar process of diverse length, forming an obtuse angle with distal part (see Fig. 40 for H. (Hyphoporus) tonkinensis ). Male metatarsal claws of equal length.

Distribution. Palaearctic and Oriental, from Iran to India and south-east Asia; one species– H. (Hyphoporus) solieri –from Iran to the Arabian Peninsula and Egypt.

Main habitat types. There is no information on the habitat of most of the species of the subgenus, although they are likely to be mostly associated with freshwater environments. However, it shall be mentioned that Hájek (2006: 48) illustrated a rest-pool in a wadi (Pir Sohrab, Iran) where he has collected H. (Hyphoporus) aper ( Sharp, 1882) together with Neptosternus circumductus Régimbart, 1899 .

Figures

FIGURE 2. Dendrogram showing the new classification of Hygrotini. A number of species without molecular data (no voucher number) have been inserted near morphologically similar species with molecular data. Acronyms refer to biogeographical regions.

FIGURES 13 – 18. Habitus of: (13) Hygrotus (Leptolambus) impressopunctatus, (14) H. (Leptolambus) orthogrammus, (15) H. (Leptolambus) obscureplagiatus, (16) H. (s. str.) guineensis, (17) H. (s. str.) descarpentriesi (male syntype and labels) and (18) H. (Hyphoporus) solieri (Figs 14 and 18 are reproduced from Fery et al. 2012 with the permission of F. Gusenleitner, Linz, Austria).

FIGURES 41 – 48. Head with details of clypeal rim of (41) Hygrotus (Leptolambus) impressopunctatus, (42) H. (Hyphoporus) solieri, (43) H. (s. str.) guineensis, (44) H. (s. str.) inaequalis, (45) idem in lateral view, (46) H. (Coelambus) confluens (the lighter area before the anterior border of the clypeus is the " clypeal stripe "; see Appendix), (47) H. (Leptolambus) masculinus and (48) idem in lateral view.

FIGURES 49 – 55. (49 – 53): Epipleuron with oblique epipleural carina and genicular fossa of: (49) Clemnius (s. str.) berneri, (50) Hygrotus (Leptolambus) polonicus polonicus, (51) H. (Coelambus) caspius, (52) H. (Leptolambus) impressopunctatus and (53) Rhithrodytes agnus; epipleural carina (c) and inner margin of epipleuron (m) including angle mentioned in diagnoses of subgenera. (54 – 55): Elytral margin in lateral view of: (54) H. (Coelambus) caspius (strongly ascending to shoulder) and (55) Clemnius (s. str.) berneri (moderately ascending to shoulder) (Figs 52 and 53 are reproduced from Fery 2013 and from Fery 2016 with the permissions of F. Gusenleitner, Linz, Austria, and G. Foster, Ayr, UK, respectively).

FIGURES 19 – 28. Median lobe in ventral and lateral view of: (19) Clemnius (Cyclopius) acaroides, (20) Clemnius (s. str.) berneri, (21) Clemnius (s. str.) decoratus, (22) Hygrotus (s. str.) inaequalis, (23) H. (Coelambus) enneagrammus, (24) H. (Coelambus) confluens, (25) H. (Leptolambus) parallellogrammus, (26) H. (Leptolambus) impressopunctatus, (27) H. (s. str.) guineensis and (28) H. (Hyphoporus) tonkinensis (Fig. 28 is a modified reproduction of figs 3 and 4 in Brancucci & Biström 2013).

FIGURES 29 – 40. Left paramere of: (29) Clemnius (Cyclopius) acaroides, (30) Clemnius (s. str.) berneri, (31) Clemnius (s. str.) decoratus, (32) Hygrotus (s. str.) inaequalis, (33) H. (Leptolambus) fresnedai, (34) H. (Leptolambus) impressopunctatus, (35) H. (Leptolambus) parallellogrammus, (36) H. (Leptolambus) nubilus, (37) H. (Coelambus) enneagrammus, (38) H. (Coelambus) confluens, (39) H. (s. str.) guineensis and (40) H. (Hyphoporus) tonkinensis (Fig. 40 is a modified reproduction of fig. 5 in Brancucci & Biström 2013).