Morphology Data of Microthrissa moeruensis
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 slender, its depth about 20-25% of standard length; scutes strongly keeled, beginning just behind base of last pectoral fin ray, about 10-12 pre-pelvic and 5-8 post-pelvic scutes; snout rather pointed; lower jaw not or slightly projecting, with small teeth limited to anterior part; pre-maxillae with a single row of 11-24 small conical teeth directed inwards; maxilla slender, its blade a little more than 3 times longer than deep, upper edge a little ridged; posterior supra-maxilla slender, spatulate, with distinct anterior shaft, shaft longer than blade; lower gillrakers 18-20 (Ref. 188, 47399). Also characterized by 33-40 scales in a longitudinal series and anal fin with 15-22 rays (Ref. 47399, 93833). It resembles small Microthrissa congica, which has a much blunter snout and less scales in a longitudinal series, 26-35 vs. 33-40 (Ref. 188, 47399).

Description: Lower jaw not or slightly projecting; premaxilla with 11-24 conical teeth; maxillary with 13-30 small conical teeth (Ref. 47399). Gillrakers slender and elongated, 18-20 in the lower branch of the first gill arch, 26-31 total gillrakers (Ref. 2266, 47399). Dorsal fin base slightly before or above origin of pelvic fins, at equal distance between tip of snout and base of caudal fin; pectoral fins not reaching pelvic fins; dorsal fin with 12-15 rays; anal fin with 15-22 rays; pectoral fin with 10-13 rays; pelvic fin with 8 rays (Ref. 2266, 47399). Cycloid scales; 33-40 scales in longitudinal series, 8-9 transversal scales (Ref. 2266, 47399, 93883). Scutes strongly keeled; with 10-12 pre-pelvic scutes and 5-8 post-pelvic scutes; first 1-2 scutes without ascending arms (Ref. 47399). Number of vertebrae 39-41; with 20-21 abdominal vertebrae and 19-20 caudal vertebrae (Ref. 47399).

Colouration: body colouration is yellowish-brown, lighter on ventral side; flanks more or less silvery (Ref. 2266). No black spot on base of lower lobe of caudal fin (Ref. 47399).

Ease of Identification

Meristic characteristics of Microthrissa moeruensis

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series 33 - 40
Scale rows above lateral line
Scale rows below lateral line
Scales around caudal peduncle
Barbels 0
Gill clefts (sharks/rays only)
Gill rakers
on lower limb 18 - 20
on upper limb
total 26 - 31
total 39 - 41


Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Spines total 0 - 0
Soft-rays total 12 - 15
Adipose fin absent

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number 1
Spines total 0 - 0
Soft-rays total 15 - 22

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   10 - 13
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Spines     0
Soft-rays   8 - 8
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Binohlan, Crispina B.
Modified by Boden, Gert
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cfm script by eagbayani, 17.10.00, php script by rolavides, 13/03/08 ,  last modified by sortiz, 06.27.17