Morphology Data of Odaxothrissa ansorgii
Identification keys
Main Ref. Gourène, G. and G.G. Teugels, 2003
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs no special organs
Different appearance males alike females
Different colors males alike females

Descriptive characteristics of juvenile and adult

Striking features none
Body shape lateral fusiform / normal
Cross section compressed
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 superior
Type of scales cycloid scales

Diagnosis: Body moderate, often deep, its depth 25% of standard length or more; 13-17 pre-pelvic and 8-11 post-pelvic scutes, 1-2 scutes before pectoral fin origin, first pre-pectoral scute longer and more developed than following scutes without ascending arms; lower jaw strongly projecting, with strong canine teeth at symphysis; pre-maxilla with 2-4 strong backward-pointing canine teeth on each side behind outer row of pre-maxillary teeth; lower gillrakers 22-33, shorter than corresponding gill filaments; anal fin with 17-21 rays; silver stripe along flank (Ref. 188, 54749, 81269, 81631). It resembles Odaxothrissa mento, which has fewer gillrakers, 16-19 vs. 22-33; and Pellonula vorax, which lacks canine teeth in the upper jaw and has longer gillrakers, equal in length to gill filaments vs. shorter (Ref. 188, 54749).

Description: Body moderate, often deep; depth 25% of standard length or more (Ref. 188). Caudal peduncle as long as deep (Ref. 1869). Snout as long as eye, which is about 33% of head length, and exceeds the interorbital width (Ref. 1869). Lower jaw strongly projecting; pre-maxilla with 2-4 strong canine teeth on each side; maxillary extending to below centre of eye (Ref. 1869, 54749, 93833). First gill arch with 32-49 gillrakers; 22-33 gillrakers on the lower limb and 10-17 on the upper limb (Ref. 2849, 54749, 81269, 81631). Dorsal fin with 14-18 rays, first ray of dorsal fin placed slightly in front of or above the pelvic insertion; anal fin with 17-21 rays; pectoral fin with 13-16 rays; pelvic fin with 8 rays; caudal fin deeply forked, with pointed lobes (Ref. 188, 1869, 54749, 81269, 81631). Cycloid scales; 40-45 scales in longitudinal series, 16-17 scales in transverse series (Ref. 1869, 54749). With 13-17 pre-pelvic and 8-11 post-pelvic scutes; pre-pectoral scutes present, 1-2 scutes in front of pectoral fin origin, first pre-pectoral scute longer and more developed than following scutes without ascending arms (Ref. 188, 54749, 81269, 81631). Number of vertebrae 44-46; with 23-25 abdominal vertebrae and 18-21 caudal vertebrae (Ref. 2849, 54749, 81269, 81631).

Colouration: Alcohol-preserved specimens are generally a light yellowish-grey, or yellowish-brown; gill cover, longitudinal stripe and ventral region much lighter (Ref. 2849, 54749, 81269, 81631). In life, upper half, with dorsal fin and base of caudal fin pale olive-green; lower half and other fins white; a broad silvery band along each side (Ref. 1869).

Ease of Identification

Meristic characteristics of Odaxothrissa ansorgii

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series 40 - 45
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Gill clefts (sharks/rays only) absent
Gill rakers
on lower limb 22 - 33
on upper limb 10 - 17
total 32 - 49
total 44 - 46


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Spines total 0 - 0
Soft-rays total 14 - 18
Adipose fin absent

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 17 - 21

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   13 - 16
Pelvics Attributes  more or less normal
Position    abdominal  beneath origin of D1
Spines     0
Soft-rays   8 - 8
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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