Morphology Data of Acestrocephalus acutus
Identification keys
Main Ref. Menezes, N.A., 2006
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 fusiform / normal
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales

Among the species of Acestrocephalus with dark humeral blotch absent, this species can be separated from Acestrocephalus sardina and Acestrocephalus nigrifasciatus by possessing a smaller eye (28.0- 31.7 vs. 32.6-36.5 in Acestrocephalus nigrifasciatus and 31.3-37.4 in Acestrocephalus sardina); and an oblong dark blotch at caudal base instead of the triangular dark blotch present on the caudal base of those two species. Distinguished from Acestrocephalus pallidus by having an oblong dark blotch at caudal base (vs. absence of dark blotch); and differs further from Acestrocephalus pallidus by the shape of the muscular hiatus of the pseudotympanum and the muscular arrangement around it. Can be diagnosed from Acestrocephalus anomalus by having more teeth in the posterior row on dentary (28-36 vs. 23-28) and fewer teeth in the external tooth row on premaxilla (6-8 vs. 8-11) (Ref. 75890).

Description: Dorsal fin ii,9; Anal fin iv,29-35; Pectoral fin i+11-14; Pelvic fin i+7 (Ref. 75890).

Ease of Identification

Meristic characteristics of Acestrocephalus acutus

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales 70 - 77
Scales in lateral series
Scale rows above lateral line 12 - 14
Scale rows below lateral line 10 - 14
Scales around caudal peduncle 22 - 24
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 6 - 8
total 37 - 39


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Spines total
Soft-rays total 11 - 11
Adipose fin present

Caudal fin

Attributes forked

Anal fin(s)

Fins number
Spines total
Soft-rays total 33 - 39

Paired fins

Pectoral Attributes  more or less normal
Soft-rays   12 - 15
Pelvics Attributes  
Position    abdominal  before origin of D1
Soft-rays   8 - 8
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Torres, Armi G.
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