EUCNEMIDAE
Author: John F. Lawrence.
Classification
Suborder Polyphaga, Series Elateriformia, Superfamily Elateroidea.
Description
Antenae with 11 segments, filiform or serrate or pectinate or flabellate. Antennal insertions exposed or concealed. Visible portion of procoxa globular with the trochantin concealed. Procoxal cavity externally open and internally open. Mesocoxae separated by 0.4 to 1 coxal width, with mesocoxal cavity laterally open. Tarsal formula 5-5-5. Numberof ventrites 5 with 5 connate. Body length 2.3-18 mm. Elongate, slender and elaterid-like, pubescent, with well-developed metacoxal plates. Labrum concealed beneath clypeus. Often with prothoracic antennal grooves.
Quick identification
Eucnemidae resemble Elateridae is most respects, but differ in having a concealed labrum (penultimate figure) and all 5 ventrites connate, in contrast to elaterids in which only the first 4 are connate. Many eucnemids have grooves on the prothorax in which the antennae fit (last figure).
Genera occurring in Costa Rica
Phyllocerinae: Anelastes.
Phlegoninae: Phlegon.
Melasinae: Adelorhagus, Adelothyreus, Arrhipis, Entomophthalmus, Farsus, Golbachia, Isorhipis, Microrhagus, Rhagomicrus.
Eucneminae: Dendrocharis, Gastraulacus, Idiotarsus, Temnillus.
Macraulacinae: Ceratogonys (= Cryptosoma), Cladus, Deltometopus, Diacerus, Diapodius, Diphytaxis, Dromaeolus, Dyscolotaxia, Eucalodemas, Eurachis, Euryptychus, Fornax, Henecosoma, Hylotastella, Nematodes, Neodiapodius, Neomathion, Phaenobolus, Plesiofornax, Thambus.
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