Morphology Data of Johnrandallia nigrirostris
Identification keys
Main Ref. Burgess, W.E., 1978
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors

Descriptive characteristics of juvenile and adult

Striking features none
Body shape lateral short and / or deep
Cross section compressed
Dorsal head profile clearly concave
Type of eyes more or less normal
Type of mouth/snout tube-like
Position of mouth terminal

Body deep, compressed, and disk-shaped; dorsal profile of head steep and concave; snout pronounced; teeth very small and se in a comb-like band; base of pelvic spine with an axillary process; lateral line complete, extending over caudal peduncle; body yellowish; snout with a dark stain; eye bordered with black; posterior edge of operculum, base of pectoral fins, nape, and dorsal border (at base of dorsal fin) black (Ref. 55763).

Ease of Identification

Meristic characteristics of Johnrandallia nigrirostris

Lateral Lines 1 Interrupted: No
Scales on lateral line 52 - 63
Pored lateral line scales 52 - 62
Scales in lateral series
Scale rows above lateral line 10 - 12
Scale rows below lateral line 23 - 26
Scales around caudal peduncle
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 16 - 20


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   0 - 0
Ventral  0 - 0
Spines total 11 - 12
Soft-rays total 24 - 25
Adipose fin absent

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 3 - 3
Soft-rays total 18 - 20

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   16
Pelvics Attributes  more or less normal
Position    thoracic  beneath origin of D1
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Reyes, Rodolfo B.
Modified by Busson, Frédéric
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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