Morphology Data of Icelus sekii
Identification keys
Main Ref. Tsuruoka, O., H. Munehara and M. Yabe, 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 elongated
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales

Distinguished from its congeners by the following characters: supraocular and parietal spines absent; nuchal spine obscure; uppermost preopercular spine unbranched; no scales between dorsal scale row and lateral line scale row, and no scales below lateral line scale row; supraocular, parietal, and nuchal cirri present; five dark brown saddles dorsolaterally; 13 anal fin rays; 15 pectoral fin rays; vertebrae 12 + 24-25 = 36-37. Male holotype with a secondary sexual character, a unique ensiform flaps on the distal tips of the first dorsal fin (Ref. 58328).

Ease of Identification

Meristic characteristics of Icelus sekii

Lateral Lines Interrupted: No
Scales on lateral line 39 - 40
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
preanal 12 - 12
total 36 - 37


Dorsal fin(s)

Fins number 2
Finlets No. Dorsal   
Spines total 9 - 9
Soft-rays total 17 - 19
Adipose fin

Caudal fin


Anal fin(s)

Fins number
Spines total
Soft-rays total 12 - 13

Paired fins

Pectoral Attributes  
Spines     0
Soft-rays   15 - 15
Pelvics Attributes  
Spines     1
Soft-rays   3 - 3
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Capuli, Estelita Emily
Modified by Capuli, Estelita Emily
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cfm script by eagbayani, 17.10.00, php script by rolavides, 13/03/08 ,  last modified by sortiz, 06.27.17