Morphology Data of Odaxothrissa mento
Identification keys
Abnormalities
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
Remarks

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

Diagnosis: Body moderate, sometimes deep, its depth 25% of standard length or more; 13-18 pre-pelvic and 8-10 post-pelvic scutes, 1-2 scutes before pectoral fin origin, first pre-pectoral scute as long as, or smaller 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 16-19, shorter than corresponding gill filaments; anal fin with 18-21 rays; silver stripe along flank (Ref. 188, 54749, 81269, 81631). It resembles Odaxothrissa ansorgii, which has more gillrakers, 22-33 vs. 16-19; 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, sometimes deep, depth 25% of standard length or more (Ref. 188, 2263). Caudal peduncle longer than deep (Ref. 2263). Snout longer than eye diameter (Ref. 2263). Lower jaw strongly projecting; pre-maxilla with 2-4 strong canine teeth on each side; maxillary extending to below anterior 1/3 of eye (Ref. 2263, 54749). First gill arch with 24-28 gillrakers; 16-19 gillrakers on the lower limb and 8-9 on the upper limb (Ref. 2849, 54749, 81269, 81631). Dorsal fin with 15-18 rays, its origin slightly before or behind base of pelvic fins; anal fin with 18-21 rays; pectoral fin with 12-15 rays; pelvic fin with 7-8 rays (Ref. 2849, 81269, 81631). Cycloid scales; 43-46 scales in a longitudinal series, 14 in transverse series (Ref. 2263, 3032, 54749). With 13-18 pre-pelvic and 8-10 post-pelvic scutes; pre-pectoral scutes present, 1-2 scutes in front of pectoral fin origin, first pre-pectoral scute as long as, or smaller than, following scutes without ascending arms (Ref. 188, 2849, 54749, 81269, 81631). Number of vertebrae 42-44; with 23-25 abdominal vertebrae and 20-21 caudal vertebrae (Ref. 54749, 81269, 81631).

Colouration: Alcohol-preserved specimens have the same colour as those of Odaxothrissa ansorgii: generally varying from light yellow-brown to grey yellow-brown; operculum, longitudinal stripe and ventral region silvery coloured or much lighter (Ref. 2849, 54749, 81269, 81631).

Ease of Identification

Meristic characteristics of Odaxothrissa mento

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series 43 - 46
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 16 - 19
on upper limb 8 - 9
total 24 - 28
Vertebrae
preanal
total 42 - 44

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total 0 - 0
Soft-rays total 15 - 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 18 - 21

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   7 - 8
Pelvics Attributes  more or less normal
Position    abdominal  beneath origin of D1
Spines     0
Soft-rays   12 - 15
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Binohlan, Crispina B.
Modified by Boden, Gert
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