Identification of Xylotoles costatus is difficult as it is very similar in appearance to another longhorn beetle found in the Chatham Islands, Xylotoles traversii.
Both species are coloured black with a green bronze sheen, however it is likely that X. costatus has more of a bronze sheen than X. traversii.
Of the two species X. costatus also has the more pronounced ridges on its wing cases.
Generally X. traversii is the smaller beetle of the two, but the size of the two species can overlap.
However, if a longhorn beetle specimen is found in the Chatham Islands that is greater than 16 mm in length it is likely to be X. costatus.
Identification of Xylotoles costatus is difficult as it is very similar in appearance to another longhorn beetle found in the Chatham Islands, Xylotoles traversii. Both species are coloured black with a green bronze sheen, however it is likely that X. costatus has more of a bronze sheen than X. traversii. Of the two species X. costatus also has the more pronounced ridges on its wing cases. Generally X. traversii is the smaller beetle of the two, but the size of the two species can overlap. However, if a longhorn beetle specimen is found in the Chatham Islands that is greater than 16 mm in length it is likely to be X. costatus.
Xylotoles costatus