Hypocuma, JONES, 1973

Haye, Pilar A., 2007, Systematics of the genera of Bodotriidae (Crustacea: Cumacea), Zoological Journal of the Linnean Society 151 (1), pp. 1-58 : 28

HYPOCUMA JONES, 1973

Type species: Hypocuma serratifrons Jones, 1973

Body: Carapace shorter than abdomen and longer than peraeon; abdomen longer than carapace and peraeon together.

Cephalothorax: From dorsal view the carapace appears laterally compressed anteriorly. Carapace with mid-dorsal ridge or mid-dorsal serration. Pseudorostral lappets extend beyond frontal lobe and meet in midline. Antennal notch not distinct. Anterolateral corner bluntly rounded. Frontal lobe from 1/4 of carapace length; as wide as long or wider than long; not extended; without ocular pigment or eye lenses.

Antenna 1 with basal article of the peduncle arcuate or straight; longer than the other two articles together or as long as the other two articles together. Main flagellum uni-, bi- or tri-articulated; with second article longer than third; with two aesthetascs in distal-most article. Accessory flagellum uni- or bi-articulated. Antenna 2 in males with sensory setae on anterior margin of article four. Antenna 2 in females with five articles.

Maxilliped 3 basis geniculate or arcuate; not projected over ischium. Ischium shorter than merus. Merus extended dorso-distally over carpus. Carpus may be oviform; equal to or shorter than propodus and dactylus together. Propodus may be oviform.

Peraeon: First peraeonite well exposed. Peraeonite 2 narrow or proportional to other peraeonites; with ventrolateral expansion overriding peraeonite 1 and/or carapace or peraeonite 3. Peraeonite 3 extended forward overriding peraeonite 2 or backwards overriding peraeonite 4. Peraeonite 4 with ventrolateral expansion overriding peraeonite 3, peraeonite 5 or peraeonites 3 and 5.

Females and males with fully developed exopods on peraeopods 1–3. Females with reduced exopods on peraeopod 4, while males have them fully developed. Peraeopod 1 with basis arcuate; carpus same size as propodus. Peraeopod 2, ischium present; dactylus longer than propodus. Peraeopod 4 with ischium.

Pleon: Pleonite 6 longer than wide; shorter than peduncle of uropod. Wide portion of distal end of pleonite 6 strongly extended past the insertion of the uropods; apex rounded.

Uropod endopod bi-articulated; proximal article longer than distal one. Uropod exopod with proximal article shorter than distal one. Peduncle of uropods slightly longer than rami; exopod longer than endopod. Males with five pairs of pleopods. Pleopodal endopod with well developed process.

Species included:

1. H. dentatum Day, 1975

2. H. serratifrons Jones, 1973

Distribution: Heterocuma dentatum is found off the southern point of South Africa at 400 m, while Heterocuma serratifrons is found in the North Atlantic at depths between 1000 and 5000 m.