Morphology Data of Alepocephalus planifrons
Identification keys
Main Ref. Sazonov, Y.I., 1994
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral elongated
Cross section compressed
Dorsal head profile clearly convex
Type of eyes
Type of mouth/snout more or less normal
Position of mouth terminal
Type of scales

Head relatively short, <39.5-0.025% SL. Snout short (22-28%HL); broadly triangular anteriorly when viewed from above. Orbit diameter about 1/5 to 1/4 HL, along the whole upper edge and on the separate elongate-shaped part of the lower-posterior part of the orbit are accumulation s of whitish connective tissue. Interorbital space very wide, ca. 17-30% HL, flat, narrows very slightly at the middle of the orbit. Upper jaw extends to below the center of the orbit. Branchiostegal rays 8-9. Transverse rows of scales above lateral line 60-65, 30-35 predorsal. Gill rakers' length less than gill lamellae length, and completely free at the base. Opercle has a projection at the lower anterior corner; subopercle has a wide posterior edge usually with no separate processes. Anus not shifted forward from the origin of the anal fin. Pyloric caeca 12-18 (Ref. 41471).

Ease of Identification

Meristic characteristics of Alepocephalus planifrons

Lateral Lines Interrupted: No
Scales on lateral line 54 - 60
Pored lateral line scales 54 - 60
Scales in lateral series
Scale rows above lateral line 8 - 11
Scale rows below lateral line 9 - 11
Scales around caudal peduncle
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 24 - 27
total 52 - 54


Dorsal fin(s)

Fins number
Finlets No. Dorsal   
Spines total
Soft-rays total 17 - 20
Adipose fin

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number
Spines total
Soft-rays total 18 - 21

Paired fins

Pectoral Attributes  more or less normal
Soft-rays   9 - 10
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Soft-rays   6 - 8
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Capuli, Estelita Emily
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