The brachyuran genus Titanocarcinus A. Milne-Edwards, 1864, is rediagnosed and restricted to six species. It is referred to the Tumidocarcinidae Schweitzer, 2005, based upon characters of the sternum, male pleon, and dorsal carapace, along with the closely related Lobonotus A. Milne-Edwards, 1864. Several species that had been referred to Titanocarcinus are herein referred to other genera, including two new ones, Nitotacarcinus and Lathahypossia, or to other families in indeterminate genera. One new species is described from the lowermost Eocene of Spain, Titanocarcinus decor. Titanocarcinus as currently defined ranged from the Cretaceous to Eocene in northern and central Europe. Lobonotus is known only from the Eocene of North and Central America.
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Vol. 27 • No. 2