Morphology Data of Melanocetus johnsonii
Identification keys
Abnormalities
Main Ref. Pietsch, T.W., 1986
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks

Descriptive characteristics of juvenile and adult

Striking features other (see diagnosis)
Body shape lateral short and / or deep
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

Esca with compressed posterior and anterior crests; anterior margin of vomer nearly straight; minute skin spines present over most of body (Ref. 13608). Branchiostegal rays 6 (Ref. 36493). Caudal-fin rays 8. Scales are cone-shaped, hollow and translucent; with circular base and a free edge pointing towards the caudal region. Left otolith, oblong shape with regular edges, inner face does not present rostrum, antirostrum or cisure (Ref. 41244).

Distinguishing characteristics of metamorphosed female: least outside width between frontals 13.5-28.6% SL; upper jaw with 48-134 teeth, lower jaw 32-78 teeth; length of longest tooth in lower jaw 8.4-25% SL; width of pectoral fin lobe 10.7-17.8% SL; width of escal bulb 4.3-8.6% SL; length of illicium 32.4-60.8% SL; skin with minute spinules over most of body; relatively thick integument 1.55 mm (Ref. 86949). Distinguishing characteristics of metamorphosed male: upper denticular with 9-13 ventrally directed anterior teeth and posteromedial series of 8-11 teeth; lower denticular 12-24 teeth; posterior nostril contiguous with eye; at most 24 olfactory lamellae; skin naked or spinulose (Ref. 86949).

Ease of Identification

Meristic characteristics of Melanocetus johnsonii

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 0 - 0
on upper limb 0 - 0
total 0 - 0
Vertebrae
preanal 20 - 20
total

Fins

Dorsal fin(s)

Attributes
Fins number 1
Finlets No. Dorsal   0 - 0
Ventral  0 - 0
Spines total 1 - 1
Soft-rays total 13 - 17
Adipose fin absent

Caudal fin

Attributes more or less truncate

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 3 - 5

Paired fins

Pectoral Attributes  
Spines     0
Soft-rays   17 - 23
Pelvics Attributes  
Position    
Spines     0
Soft-rays   
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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