Cyclothone acclinidens

Author: Garman, 1899

Cyclothone acclinidens Garman, 1899

Status in World Register of Marine Species:
Accepted name: Cyclothone acclinidens Garman, 1899 (updated 2009-06-25)

Diagnosis: body elongate; mouth large; premaxillary teeth even; teeth on posterior half of upper jaw strongly curved forwards, enlarging uniformly caudad without small intermediate teeth (Fig. 7a); vomer with teeth. Pseudobranch absent. Meristic data (eastern North Atlantic only): gillrakers on first arch 23-25, 5 (6) on hypobranchial, no raker in articulation of epi- and ceratobranchial; branchiostegal rays 13-14, 5-6 on epihyal. Dorsal finrays (13) 14; pectoral finrays (8) 9-10; pelvic finrays (5) 6; anal finrays 18-20; dorsal and anal fin origins about opposite; last dorsal and anal finrays not split to base; dorsal adipose fin absent; anus midway between pelvic bases and anal fin origin or slightly nearer former. Pyloric caeca 3. Vertebrae 30- 52. Scales present. Photophores: SO absent, ORB 1, OP 2, BR 9-10, IV 3 + 10 (11); VAV 4 5, 2-3 anterior to genital opening; AC 14-16, two between last anal and first procurrent rays; OA 9; supra-caudal gland massive, extending to dorsal base, larger than infracaudal; opercular gland weakly developed, restricted to area between OP. Colour: uniformly brown. Size: male to 36 mm, female to 60 mm SL.

Habitat: oceanic, deep mesopelagic; pre-metamorphic post-larvae at 0-70 m, juveniles and adults at 300 1,200 m; usually vertically orientated ir daytime (submersible observations). Food: mainly copepods. Reproduction: presumed dioecious.

Distribution: circumglobal; tropical in North Atlantic, although sampled throughout Clofnam area to about 60° N; northern record 65° 58' N; absent in Mediterranean.

Eggs, larvae and young stages. Grey, 1964 : 185.
Otoliths (sagitta). Kotthaus, 1967: 19, fig. 26.