Morphology Data of Atropus armatus
Identification keys
Abnormalities
Main Ref. Masuda, H., K. Amaoka, C. Araga, T. Uyeno and T. Yoshino, 1984
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks Dorsal fin of males (larger than about 21 cm FL) with 3 central rays produced into filaments of variable length. (Ref. 90102)

Descriptive characteristics of juvenile and adult

Striking features striking fins
Body shape lateral fusiform / normal
Cross section compressed
Dorsal head profile more or less straight
Type of eyes more or less normal
Type of mouth/snout more or less normal
Position of mouth terminal
Type of scales
Diagnosis

Description: Bluish grey dorsally, shading to silvery on side, with blackish blotch on upper rear margin of the opercle (Ref. 90102). Body strongly compressed and deep; head profile very deep in adult (Ref. 48635, Ref. 90102). Snout sub equal to eye in length (Ref. 559). Breast scaleless ventrally to behind origin of pelvic fins. LL scutes 11-24, weak; total elements 25-43. Anterior lobes of first dorsal and anal fins elongate with growth. Dorsal fin of males (larger than about 21 cm FL) with 3 central rays produced into filaments of variable length (Ref. 90102).

Ease of Identification

Meristic characteristics of Atropus armatus

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Barbels 0
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 19 - 21
on upper limb 8 - 9
total 27 - 20
Vertebrae
preanal
total

Fins

Dorsal fin(s)

Attributes first fin ray very elongated
Fins number 2
Finlets No. Dorsal   0 - 0
Ventral  0 - 0
Spines total 9 - 9
Soft-rays total 19 - 22
Adipose fin absent

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 2
Spines total 3 - 3
Soft-rays total 16 - 18

Paired fins

Pectoral Attributes  more or less normal
Spines     1
Soft-rays   
Pelvics Attributes  more or less normal
Position    abdominal  beneath origin of D1
Spines     
Soft-rays   
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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