Carboniferous ostracod behavior discovered

Monospecific ostracod accumulations mainly within cephalopod (a nautiloid and two goniatites) phragmocones (siphuncle and camerae), are described from the Carboniferous of England. Exclusive occurrence of disarticulated carapaces and preservation of delicate morphological structures indicate that these accumulations did not result from sedimentological processes, but rather reflect the ostracod behaviour, namely seeking a sheltered place for moulting, as well as for egg laying, the latter supported by the presence of spherical structures preserved within one of the accumulations.