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 : 8

Eucnemidae : Macraulacinae , Nematodini ( Fig. 6C )

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 rudimentary in contrast to all other Eucnemidae except Anischiinae , Melasini , Hylocharini and all extreme 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 and Throscidae (c86). Mandibles large, freely movable and powerful, exodont as in Hylocharini and Melasini and different from those of all other discussed taxa. 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 Melasini , presternum undefined, mesothorax without sclerotized structures contrary to Melasini . Legs visible as dark spots only as in all Eucnemidae except Perothopinae , Phyllocerinae , Pseudomeninae , Anischiinae and the non-eucnemids discussed. Abdominal segments with both microtrichial patches and areoles contrary to Melasini and Hylocharini . Spiracles with closing apparatus as in other Eucnemidae , all Cerophytidae andThroscidae,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.