Morphology Data of Stegastes nigricans
Identification keys
Abnormalities
Main Ref. Allen, G.R. and A.R. Emery, 1985
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors different colors in juveniles and adults
Remarks

Descriptive characteristics of juvenile and adult

Striking features none
Body shape lateral short and / or deep
Cross section oval
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 ctenoid scales
Diagnosis

Diagnosis: Adults generally brown; dorsal part of head and nape darker, grading to tan on lower part of head and breast. The scales have darker brown margins. The lips are whitish lips; the suborbital is mostly blue; the preopercle and opercle scales with blue centers. The median and pelvic fins are brown; the pectorals are dusky; a well-defined dark brown or blackish spot is sometimes present at base of posteriormost dorsal rays, which distinguishes it from S. lividus where the spot is diffuse. Males in courtship or guarding eggs with broad white bar across middle of body and pale blue stripe from mouth to upper part of pectoral fin (Ref. 510).

Ease of Identification

Meristic characteristics of Stegastes nigricans

Lateral Lines 1 Interrupted: No
Scales on lateral line 17 - 19
Pored lateral line scales 17 - 19
Scales in lateral series
Scale rows above lateral line 2.5 - 2.5
Scale rows below lateral line 9 - 12
Scales around caudal peduncle
Barbels 0
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 23 - 28
Vertebrae
preanal
total

Fins

Dorsal fin(s)

Attributes extending over most of the back length
Fins number 1
Finlets No. Dorsal   0 - 0
Ventral  0 - 0
Spines total 12 - 12
Soft-rays total 15 - 17
Adipose fin absent

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 2 - 2
Soft-rays total 12 - 14

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   18 - 20
Pelvics Attributes  more or less normal
Position    thoracic  behind origin of D1
Spines     0
Soft-rays   
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Capuli, Estelita Emily
Modified by Olisa, Kristine Elaine Paz
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