Eucnemidae, sensu Muona, 1993

Muona, Jyrki & Teräväinen, Marianna, 2020, A Re-evaluation of the Eucnemidae larval characters (Coleoptera), Papéis Avulsos de Zoologia 60 (28), pp. 1-13 : 6

Eucnemidae : Melasinae , Melasini

( Fig. 6B )

Head capsule small, cap-like, divided in ventral and dorsal plates but these fused (c83), antennae located in deep pits, basal, lateral and front teeth absent in contrast to all other Eucnemidae except Anischiinae , Nematodini , Hylocharini and all hypermetamorphic Eucneminae . Labrum fused to head without trace as in all Eucnemidae except Phyllocerinae and Pseudomenini (c88). Number of antennomeres reduced as in all Eucnemidae except Phyllocerinae and Pseudomeninae , in contrast to Elateridae , Cerophytidae andThroscidae (c86).Mandibles freely movable, powerful and exodont, large in size as in Hylocharini and Nematodini , contrary to those in other Macraulacinae and Melasinae . Maxillolabial complex completely fused with epicranium as in other Eucnemidae except Perothopinae , Pseudomeninae and Anischiinae , contrary to Cerophytidae and Throscidae (separate, but incapable of movement) and Elateridae (freely movable) (c100). Prothorax substantially wider than mesothorax, ventrally and dorsally with conspicuous T-formed sclerotizations as in Nematodini (3F), mesothorax with sclerotized median rod, presternum unde- fined. Legs visible as dark spots only as in all Eucnemidae except Perothopidae , Phylloceridae, Pseudomeninae , Anischiinae and the non-eucnemids discussed. Abdominal segments without microtrichial patches and areoles contrary to Nematodini (both present) and Hylocharini (areoles present). Spiracles with closing apparatus as in other Eucnemidae , all Cerophytidae and Throscidae , in contrast to Elateridae .

Figures

Figure 6. Eucnemidae, larval heads, solid wood boring types. (A) Hylochares cruentatus (Gyllenhal), dorsal; (B) Melasis pectinicornis Melsheimer, dorsal; (C) Trigonopleurusrugulosus Bonvouloir,dorsal.a = antenna,m = mandible.