Adult Acanthosomatidae have moderate sized scutellum (typically triangular to subtriangular in shape) and two-segmented tarsi. Acanthosomatid bugs are most often confused with pentatomids, however the tarsi are three-segmented in the latter family. There are three subfamilies – Acanthosomatinae, Blaudusinae, and Ditomotarsinae. All subfamilies are listed as occurring in Australia, including Tasmania, though the last subfamily record for Tasmania is thought to be possibly the result of a locality error of an African species (Aesepus signoretii).
The subfamilies are separated generally on ventral characters. Acanthosomatinae typically have a well developed longitudinal sternal carina and abdominal spine (forwardly directed process from the base of the abdomen), the latter meeting, largely overlapping or fusing with the former. These are variously developed in Amphaces and Eupolemus. Blaudusinae lack a well developed sternal carina and the abdominal spine is long, clearly reaching beyond mid coxae and often to fore coxae or beyond (Blaudusini), or very short, sometimes longer and reaching front of mid coxae (Lanopini). Ditomotarsinae lack an abdominal spine.
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Six genera are found on the Australian mainland, three of which also for Tasmania.
Nine genera are listed for the Australian mainland, only three of these (Andriscus, Mochus, and Monteithiessa) are not found in Tasmania.
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