Abstract

The species of the Hydaticus (Prodaticus) fabricii group (Coleoptera: Dytiscidae) are reviewed on the basis of the aedeagal median lobes and the elytral colour patterns; eighteen species (including two new species: H. geiseri sp.n. and H. mazzoldii sp.n.) and one subspecies of the H. fabricii group are treated. The H. grammicus species group is newly established. It is distinguished from the H. fabricii group by the male genitalia. Besides H. grammicus (G ERMAR , 1827), this group includes H. thermonectoides S HARP , 1884 and two new species (H. schoenleithneri sp.n., H. shaverdoae sp.n.). Hydaticus parallelus CLARK, 1864, H. chrisi N ILSSON , 2001 and another undescribed species, H. borneensis sp.n., are also included in this review, because their elytral colour patterns are similar to those of some species of the H. fabricii and H. grammicus groups, but their male genitalia are distinctly different.

A lectotype is designated for Dytiscus varius F ABRICIUS , 1801 (= Hydaticus fabricii (MACLEAY, 1825)). Hydaticus fabricii loeffleri W EWALKA, 1979 and H. fabricii confusus B OHEMAN , 1858 are elevated to species rank, and H. tibetanus S HAVERDO et al., 2012 is synonymized with H. vaziranii W EWALKA, 1979.

Checklists and keys to the species treated herein, as well as distribution maps and numerous new faunistic records are provided. Significant diagnostic characters are illustrated.

Keywords

Coleoptera, Dytiscidae, Hydaticus, new species, lectotype designation, new synonymy, taxonomy, new faunistic records

Fulltext

Review of the Hydaticus fabricii group and the newly established H. grammicus group (Coleoptera: Dytiscidae)