Derallus Sharp

Short, Andrew Edward Z. & Torres, Phillip J., 2006, Review of the Hemiosus Sharp and Derallus Sharp of North America, Central America, and the Caribbean (Coleoptera: Hydrophilidae: Berosini), Zootaxa 1369, pp. 1-17: 9-10

publication ID

10.5281/zenodo.174866

publication LSID

lsid:zoobank.org:pub:7675CC72-B6D3-4EF6-B2EB-FE37BD42CEC1

persistent identifier

http://treatment.plazi.org/id/8D7A87A6-FFE8-FFA4-1F50-BB3FAE2283B4

treatment provided by

Plazi

scientific name

Derallus Sharp
status

 

Key to the Derallus Sharp  exclusive of South America

1 Metaventrite with median carina relatively fine and narrow (e.g. Fig. 10View FIGURES 10 – 11). Mesosternal

process forming a bifid or toothed tubercle, but never a single broad pillar. Punctation on pronotum and elytra distinct..................................................................................... 2 - Metaventrite with the median carina very broad ( Fig. 11View FIGURES 10 – 11). Mesosternal process forming a robust, posteriorly curved pillar. Punctation on pronotum and elytra extremely fine ( Fig. 9View FIGURES 6 – 9) ......................................................................................... D. angustus  Sharp

2 Interstria X with a single row of fine punctures, or at most an irregular double row (e.g. Figs. 6–7View FIGURES 6 – 9). Aedeagus normal, without extension of basal piece; parameres may be blunt but never quadrate ........................................................................................... 3

- Interstria X with a broad field of punctures, usually three across on anterior half ( Fig. 8View FIGURES 6 – 9). Aedeagus with basal piece greatly extended, with apical portion of parameres bluntly quadrate ........................................................................................ D. rudis  Sharp

3 Mesosternal process with posterior tooth distinctly more elevated than anterior tooth, the latter sometimes appearing nearly absent................................................................ 4

- Mesosternal process with two apical teeth more or less coplanar..... D. altus (LeConte) 

4 Ground punctation between intervals fine but distinct ( Fig. 7View FIGURES 6 – 9) .... D. terraenovae  Oliva

- Ground punctation between intervals present but nearly obsolete.................................. ................................................................................................. D. ambitus  d’Orchymont