Morphology Data of Arnoldichthys spilopterus
Identification keys
Main Ref. Paugy, D., 2003
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs no special organs
Different appearance
Different colors always different colors between mature adults
Remarks Sexual dimorphism affecting the colour of the anal fin (Ref. 2880, 81279).

Descriptive characteristics of juvenile and adult

Striking features none
Body shape lateral fusiform / normal
Cross section
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 cycloid scales

Diagnosis: scales distinctly larger above than below lateral-line; 8 teeth in outer tooth row of upper jaw; parietal fontanel absent (Ref. 2880, 81279).

Description: upper jaw prominent; two tooth rows on premaxilla, the outer row with 8, the inner with 12 or 13 teeth; mandible with single row of rather numerous (16-20) outer teeth; none of fins filamentous; anal fin with 3 unbranched and 11 branched rays; sexual dimorphism on anal fin: females - hyaline with black spot on rays beneath adipose fin, males - lemon yellow (sometimes yellow-ochre) with 5 dark or black bands and colored margin (Ref. 2880, 81279).

Coloration: live specimens have two lateral bands, the upper bad is red-orange, the lower blue-green; upper part of eye red; dorsal fin with white-edged black spot lined with a clear zone which occupies 2/3 of the anterior portion of the dorsal; preserved specimens have light dorsal region with black dots on scale centres; sides with light longitudinal band and dark lower half of body. Back, snout and median rays of caudal fin (apart from blotches on dorsal and anal fins) dark (Ref. 2880, 81279).

Ease of Identification

Meristic characteristics of Arnoldichthys spilopterus

Lateral Lines 1 Interrupted: No
Scales on lateral line 30 - 33
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 4.5 - 4.5
Scale rows below lateral line 3.5 - 4.5
Scales around caudal peduncle
Barbels 0
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Spines total
Soft-rays total
Adipose fin present

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 14 - 14

Paired fins

Pectoral Attributes  more or less normal
Pelvics Attributes  more or less normal
Position    abdominal  beneath origin of D1
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Palomares, Maria Lourdes D.
Modified by Geelhand, Dimitri
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