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 Major Groups | Insecta (insects) | Coleoptera (beetles)

 
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26(1). Prothorax (Pt) with pair of notopleural sutures (NpS), separating notum (N) from externally visible pleuron (P); abdomen usually with ventrite 1 (V1) divided into 2 OR 3 parts by hind coxae (C); tarsi always 5-segmented; antennae (A) never with a segmented club

Note: IF ventrite 1 (V1) not divided by hind coxae (C) THEN eyes divided. 

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Carabidae 

notopleural sutures present
pleuron visible

Carabidae 

ventrite 1 divided into 2 parts

Hygrobiidae 

tarsi 5-segmented

Dytiscidae 

antennae without segmented club

Gyrinidae 

ventrite 1 not divided BUT eyes divided

Gyrinidae 

ventrite 1 not divided BUT eyes divided

-Prothorax without notopleural sutures; pleuron reduced and concealed; ventrite 1 (V1) not divided by hind coxae (C); tarsi 4- or 5-segmented; antennae (A) with OR without segmented club (C)

Note: Sphaeriusidae does not have the prothorax, sternum and pleuron as above BUT tarsi are 3-segmented and antennae have a 3-segmented club.

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Elmidae 

notopleural sutures absent
pleuron concealed

Psephenidae 

ventrite 1 not divided

Heteroceridae 

tarsi 4-segmented

Elmidae 

tarsi 5-segmented

Hydrochidae 

antennae with segmented club

Elmidae 

antennae without segmented club

 

Sphaeriusidae