Balgus eganensis, copyright Andreas Kay.

Belongs within: Elaterinae.

The Thylacosterninae are a small family of click beetles with distally pectinate antennae and the mesocoxal cavity open to the mesepimeron only (Calder 1996).

Characters (from Calder 1996): Head more or less convex anteriorly. Frontal carina obsolete. Antennae inserted into U-shaped depressions. Mandiblar apex unidentate, directed ventrally. Labrum partially hidden. Antennae pectinate from antennomere 4. Prothorax wider than long. Prosternal spine shorter than procoxal diameter. Prosternum trunctate. Pronotosternal suture deeply grooved for reception of antennae. Mesocoxal cavity open to mesepimeron only. Hind wing with very reduced (less than 2.5× as long as wide) radial cell; vein MP4 with apparent cross vein to CuA2; wedge cell present; apex of wing membrane (without venation) occupying less than 0.2× length of wing membrane; apex with single slanting sclerotisation. Tarsomeres 1–4 each with membranous lamella apico-ventrally. Tarsal claws without basal setae on outer flat portion.

<==Thylacosterninae [Balginae]
    |--Pterotarsus bimaculatusB14, KB11
    |--Cussolenis Fleutiaux 1918 [=Soleniscus Bonvouloir 1871 non Meek & Worthen 1861]C96
    |    `--*C. mutabilis (Bonvouloir 1875) [=*Soleniscus mutabilis]C96
         |--B. albofasciatusB14
         |--B. eganensisB14
         |--B. eschscholtziB14
         |--B. humilisB14
         |--B. obconicusB14
         |--B. rugosusB14
         |--B. schnusei (Heller 1914)B14
         |--B. subfasciatusB14
         `--B. tuberculosusB14

*Type species of generic name indicated


[B14] Bouchard, P. (ed.) 2014. The Book of Beetles: A lifesize guide to six hundred of nature’s gems. Ivy Press: Lewes (United Kingdom).

[C96] Calder, A. A. 1996. Click beetles: genera of the Australian Elateridae (Coleoptera). CSIRO Australia: Collingwood.

[KB11] Kundrata, R., & L. Bocak. 2011. The phylogeny and limits of Elateridae (Insecta, Coleoptera): is there a common tendency of click beetles to soft-bodiedness and neoteny? Zoologica Scripta 40: 364–378.

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