Morphology Data of Pellona ditchela
Identification keys
Main Ref. Whitehead, P.J.P., 1985
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 terminal
Type of scales cycloid scales

Diagnosis: Body moderately deep, compressed, belly with strongly keeled scutes, 17-20 pre-pelvic and 8-10 post-pelvic scutes, with a total of total 25-29 scutes (Ref. 188, 6867). Eye large; lower jaw projecting; upper jaw with a toothed hypomaxillary bone between hind tip of pre-maxilla and lower bulge of maxilla blade; lower gillrakers 22-27; dorsal fin origin near midpoint of body; pelvic fins present; anal fin with 34-42 finrays; scales with upper and lower vertical striae slightly overlapping each other at centre of scales (Ref. 188). It closely resembles Pellona dayi, which has only 20-21 lower gillrakers and the vertical scale striae not meeting at centre of scale; species of Ilisha have no hypomaxilla; other pristigasterids are much more slender and lack pelvic fins (Ref. 188).

Description: Body fairly deep and compressed, its depth 25 to 36% of standard length (Ref. 6867). Lower jaw very prominent, toothed hypomaxilla present in upper jaw; eyes large, about 30% of head length (Ref. 6867, 30573). Gillrakers 22-27 on lower arm of first arch (Ref. 188, 3259, 6867). Dorsal fin with 3-4 unbranched rays and 13-16 branched rays, its origin about midway between snout-tip and caudal fin base; pectoral fin with 1 unbranched ray and 13-17 branched rays; pelvic fins, with 1 unbranched ray and 6 branched rays, slightly in advance of dorsal-fin origin; anal fin fairly long, with 3-4 unbranched rays and 31-38 branched rays, its origin slightly behind dorsal-fin base (Ref. 3259, 6867). Scales on lateral line 37-44; scales with vertical striae discontinuous, but slightly overlapping in scale centre (Ref. 3259, 11441). Belly with strongly keeled scutes; 17-20 pre-pelvic scutes, 8-10 post-pelvic scutes, total 25-29 scutes (Ref. 3259, 6867).

Colouration: Back blue-brown, flanks silvery; fins hyaline (Ref. 3259, 6867).

Ease of Identification

Meristic characteristics of Pellona ditchela

Lateral Lines Interrupted: No
Scales on lateral line 37 - 44
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 22 - 27
on upper limb


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Spines total 0 - 0
Soft-rays total 16 - 19
Adipose fin absent

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 34 - 42

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   14 - 18
Pelvics Attributes  more or less normal
Position    abdominal  beneath origin of D1
Spines     0
Soft-rays   7 - 7
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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