"The hands of the female (and to a less extent the small hand of the male) have well-marked ridges on the outside and are not full but narrow, like those of T. admeta, var savignyi. One specimen from Suvadiva has the spines on the fore edge of the meropodite of the cheliped blunt, as they are said to be in T. chaptali. The shape of the frontal lobes and of the frontal notch varies considerably, and some specimens can hardly be told from T. admeta, var. savignyi, when young, or from var. edwardsi of the same species when full grown. In other cases there are traces of scaly markings on the under side of the chelipeds which recall T. admeta, var. granosimana on the other hand, and T. sima on the other. From the latter species, however, as well as from T. chaptali, T. poissoni is sharply distinguished, as yet, by the presence on the hinder edge of the propodite of the last leg, of several spinules, of which there is no trace in T. sima or T. chaptali. From T. admeta it is sundered by its much smaller size(Borradaile, 1902; pg. 201-2)."
"At present, therefore, it is necessary to keep separate the four forms of Thalamita known as T. admeta, T. sima, T. poissoni and T. chaptali; but it is far from impossible that they may eventually prove to be all varieties of one species, perhaps in process of separation as independent species (Borradaile, 1902; pg. 202)."
"Dredged in Suvadiva, South Nilandu, Mulaku, Addu, Haddumati, Miladumadulu, Fadifolu, Kolumadulu, and Minikoi, on all kinds of bottoms, in from 7-43 fathoms. Elsewhere has generally been taken on the shore, but the same remarks apply here as in the case of T. sima (Borradaile, 1902; pg. 202)."
