COLEOPTERA, Linnaeus, 1758
publication ID |
https://doi.org/ 10.5281/zenodo.13244881 |
persistent identifier |
https://treatment.plazi.org/id/03D687B7-A72A-FFA0-39A8-F9C7BAB24AAD |
treatment provided by |
Felipe |
scientific name |
COLEOPTERA |
status |
|
KEY TO THE FAMILIES OF SINGAPORE AQUATIC COLEOPTERA
(True and Phytophilous Water Beetles, adults only)
1. Head prolonged into a beak .............................. Curculionidae View in CoL
– Head not prolonged into a beak ............................................ 2
2. Middle and hind legs much shorter than forelegs, broad and paddlelike. Eyes completely divided into a dorsal and a ventral eye. ........................................................................... Gyrinidae View in CoL
– Middle and hind legs not remarkably shorter than forelegs. Eyes usually not divided. If divided, then body of beetle strongly arched in lateral view (only genus Amphiops View in CoL ) ...................... 3
3. Hind tarsi 4-segmented, third segment bilobed (genus Donacia View in CoL ) ............................................................................. Chrysomelidae View in CoL
– Hind tarsi 5-segmented, third segment not bilobed ............. 4
4. Antennae club-shaped ............................................................ 5
– Antennae not club-shaped ..................................................... 7
5. Small, elongated beetles, length <2.5 mm. Body in lateral view appearing rather flat. Abdomen with 6 or 7 ventrites .................................................... Hydraenidae View in CoL : Genus Hydraena View in CoL
– Beetle usually larger than 2.5 mm, body oval. In lateral view usually at least dorsally more or less convex or arched. Abdomen with 5 ventrites, or with 5 th ventrite short and emarginate so that an invaginated segment becomes visible, producing the impression of presence of a sixth ventrite (only Berosus View in CoL ) ................................................................................................... 6
6. Beetle with dorsal tubercles. Anterior margin of head (i.e. anterior margin of clypeus) distinctly emarginate with anterior corners upturned; labrum strongly deflected (not seen from above) .................................................................... Spercheidae View in CoL
– Beetle without dorsal tubercles. Anterior margin of clypeus rarely emarginate, with anterior corners never upturned; labrum usually visible from above, rarely strongly deflected ............................................................................. Hydrophilidae View in CoL
7. Metacoxa elevated ..................................................... Noteridae View in CoL
– Metacoxa not elevated ............................................ Dytiscidae View in CoL
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