Diplophos maderensis

Author: Johnson, 1890

Diplophos maderensis Johnson, 1890

Status in World Register of Marine Species:
Accepted name: Manducus maderensis (Johnson, 1890) (updated 2009-06-25)

Diagnosis: body elongate; mouth large, premaxillary teeth uniserial; pseudobranch present; gillrakers on first arch 12-14; branchiostegal rays 13, 4 on epihyal. Dorsal finrays 12-13; pectoral finrays 10-11; pelvic finrays 8; anal finrays 36-41; dorsal fin origin nearer caudal fin base than snout and well in advance of, and anus close to, anal fin origin; last dorsal and anal finrays usually split to base. Vertebrae 63-66. Swimbladder capacious. Scales deciduous. Photophores: present on isthmus; SO 1, ORB 1, OP 3, BR 8-9; IV 30-33, posteriormost on pelvic base; VAV 12-14; AC 28-30, evenly spaced; OA 45-48, extending over anal fin. Accessory photophores: (a) head, series of minute photophores above anterior toothed part of maxilla, with single photophore posterior to it and single photophore beneath end of maxilla; clusters of minute photophores posterior to SO and sometimes between posterior-most branchiostegal rays; (b) body, similar to D. taenia except only I non-serial pre-pectoral primary photophore and no small post-anus midline photophore. Colour: back dark, flanks silvery, finrays finely speckled; posteriorly upper and lower jaw transparent. Size: to 220 mm SL.

Habitat: mesopelagic, juveniles and adults at 400-800 m by day, postlarvae near surface; diel vertical migrations (often reach surface at night). Food: no data. Reproduction: key characters distinct at 17 mm SL (post- shrinkage).

Distribution: tropical Atlantic endemic, infrequently collected in Clofnam area; absent in Mediterranean.

Eggs, larvae and young stages: unknown; see Grey, 1964: 99.
Otoliths (sagitta). No data.