Morphology Data of Irvineia voltae
Identification keys
Main Ref. De Vos, L., 2003
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors

Descriptive characteristics of juvenile and adult

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

Diagnosis: posterior (=inner) side of pectoral-fin spines strongly denticulate; 58-68 branched anal-fin rays; 16-18 gill rakers on lower limb of first gill arch; barbels very short, nasal barbel extending to hind margin of eye; adipose fin always present; swim bladder extending backwards through a caecal appendix to above end of anal-fin base (Ref. 43912, 57127). Palatine teeth present (Ref. 57127). Posterior nostrils closer to each other than are anterior ones; 7-9 branched pelvic fin rays (Ref. 43912).

Description: 12- 14 branched pectoral fin rays; 58-68 branched anal fin rays, the first 4-5 rays simple; pelvic fins with i+8 soft rays; 55-57 non-fused vertebrae; 9-12 branchiostegal rays on one side of head; caudal peduncle longer than deep; nasal barbels rather short, not reaching beyond orbit; maxillary barbel reaching at maximum to anterior border of opercle; outer mandibular barbel short and not reaching beyond posterior border of eye; inner mandibular barbels very short, rudimentary or sometimes absent; head rounded and rather narrow; lower jaw reaching anteriorly as far as snout or somewhat further (Ref. 43912). Probably most closely related to I. orientalis from the Juba-Uebi Shebeli system, from which it can be distinguished by the coarsely serrated inner side of the pectoral spine (Ref. 43912).

Coloration: no observations on colour pattern in life (Ref. 57127). Preserved specimens: sides and belly pale and silvery, back and head darker; dorsal and caudal fins, as well as pectorals, lightly spotted; anal fin and pelvics unpigmented (Ref. 43912, 57127).

Ease of Identification

Meristic characteristics of Irvineia voltae

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 8
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 16 - 18
on upper limb 7 - 8


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   0
Ventral  0
Spines total 1
Soft-rays total 6
Adipose fin present

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total
Soft-rays total 58 - 68

Paired fins

Pectoral Attributes  more or less normal
Spines     1
Pelvics Attributes  more or less normal
Position    abdominal  behind origin of D1
Spines     1
Soft-rays   6 - 9
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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