Belongs within: Coleoptera.
The Ulodidae is a Gondwanan family of beetles, members of which were formerly classified with the Tenebrionidae or Zopheridae.
Synapomorphies (from Leschen & Rhode 2002): Antennal insertions visible in dorsal view, eyes entire or not anteriorly emarginate, procoxal cavities closed, lateral mesocoxal cavities open with exposed mesotrochantins, aedeagus with a dorsal tegmen.
<==Ulodidae
|--Dipsaconia LR02
|--Ganyme LR02
|--Meryx LR02
|--Notocerastes LR02
|--Phaennis LR02
|--Ulodes LR02
|--Trachyderas LR02
|--Trachyderastes LR02
|--Arthopus LR02
|--Brouniphylax LR02
|--Exohadrus LR02
|--Syrphetodes decoratus LR02
`--Waitomophylax Leschen & Rhode 2004 [=Archaeophylax Leschen & Rhode 2002 non Kimmins 1953] LR04
`--*W. worthyi (Leschen & Rhode 2002) [=*Archaeophylax worthyi] LR04
*Type species of generic name indicated
REFERENCES
[LR02] Leschen, R. A. B., & B. E. Rhode. 2002. A new genus and species of large extinct Ulodidae (Coleoptera) from New Zealand. New Zealand Entomologist 25: 57-64.
[LR04] Leschen, R. A. B., & B. E. Rhode. 2004. A replacement name for Archaeophylax Leschen and Rhode (Coleoptera: Ulodidae). New Zealand Entomologist 27: 125.

Arthopus looks nothing like the others in the family. Check it out: http://species.wikimedia.org/wiki/File:Arthopus_brouni.jpg
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