Aplocnemus Stephens

Liberti, Gianfranco, 2009, Improved Strategies for Branching on General Disjunctions, Zootaxa 2318, pp. 339-385 : 350

Key to species of genus Aplocnemus Stephens

1. Basal half of elytral edge, in lateral view, clearly double; pronotum very convex both crosswise and lengthwise (from base to front) (subgenus Diplambe ).................................................................................................................... 2

- Elytral edge, in lateral view, simple; pronotum more or less convex crosswise but rather flat lengthwise (subgenus Aplocnemus ).................................................................................................................................................................. 3

2. Body surface shiny black, elytral punctuation deeply impressed; male antenna pectinate. Length 4.5–5.0 mm........... ....................................................................................................................................................................... duplicatus

- Body surface dark brown, rather dull; elytral punctuation less impressed: male antenna serrate. Length 5.0– 5.5 mm ....................................................................................................................................................................... januaventi

3. Pronotum not particularly convex (crosswise), front edge straight with lateral anterior angles well visible; head (eye included) narrower than anterior edge of pronotum ..................................................................................................... 4

- Pronotum very convex (crosswise), anterior edge rounded with lateral anterior angles not well defined; head (eye included) about as wide as anterior edge of pronotum ................................................................................................. 5

4. Margins of pronotum and elytron reddish; antenna weakly serrate; antennal segments 4–11 short in both sexes, about as long as wide. Length 4.5–4.7 mm ..................................................................................................... rufomarginatus

- Margins of pronotum and elytron not as above; antenna serrate in female and almost pectinate in male; antennal segments 4–11 longer (female) or much longer (male) than wide. Length 5.3–6.7 mm ......................................... jejunus

5. Male antenna pectinate, female antenna serrate; elytral pubescence pale brown. Large size: length 4.5–5.5 mm ........ ........................................................................................................................................................................ pectinatus

- Male and female antenna serrate; elytral pubescence dark brown to black. Smaller size: length 3.5–4.0 mm.............. ...................................................................................................................................................................... cribricollis