A. Milne Edwards, 1880
Diagnosis:
Anterior margin between the frontal horns convex. A strong median spine, in addition to several others, on anterior margin of carapace between frontal horns. Inner margin of horns without spines. Epistome with five tubercles on anteromedian margin; anterolateral corner with strong spine.
Type:
Type locality: "Blake" "Station No. r 241. Profond. 163 brasses. Cariacou" ( = off the Grenadines, 12°28'22"N, 61°32'18"W, 163 fms ( = 298 m), sand and coral): type in MCZ.
Geographical Distribution:
Western Atlantic: from Carriacou Island, Grenadines, to off the mouth of the Amazon River, Amapá and Pará States, Brazil.
Habitat and Biology:
The species has been taken in depths between 120 and 298 m, but there is a record from the littoral zone, and one from 4111-4122 m. The bottom is variously described as "sand and coral", "sandy calcarenite", and "smooth, consisting of brown mud ".
Size:
Carapace lengths of 1.6 to 3.2 cm have been reported, the known maximum body length is 10 cm.
Interest to Fisheries:
So far none. The species is evidently rare, and perhaps has a restricted range. Better knowledge of its occurrence and habits is required for deciding whether a future fishery will prove feasible.