Morphology Data of Hymenocephalus hachijoensis
Identification keys
Abnormalities
Main Ref. Schwarzhans, W., 2014
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral
Cross section compressed
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

This species is distinguished by the following characters: pelvic fin rays 7-8; pectoral fin rays 14-15; short, barely projecting snout, 15-17% HL; long barbel, 30-35% HL, reaching vertical through center of orbit; large orbit diameter, 35-38% HL; infraorbital width 10-12% HL; moderately long preopercular supporter, with straight rear margin, 6-7% HL; 18-20 gill rakers; ventral striae reaching to ½ distance from pelvic fin bases to periproct; otolith has high predorsal lobe, with colliculi separated, closely placed across collum; otolith length to height (OL:OH), 1.05; total colliculum length to pseudocolliculum length (TCL:PCL), 1.6 (Ref. 98298).

Ease of Identification

Meristic characteristics of Hymenocephalus hachijoensis

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
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 18 - 20
Vertebrae
preanal
total

Fins

Dorsal fin(s)

Attributes
Fins number
Finlets No. Dorsal   
Ventral  
Spines total
Soft-rays total
Adipose fin

Caudal fin

Attributes

Anal fin(s)

Fins number
Spines total
Soft-rays total

Paired fins

Pectoral Attributes  
Spines     
Soft-rays   14 - 15
Pelvics Attributes  
Position    
Spines     
Soft-rays   7 - 8
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