Morphology Data of Microthrissa minuta
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, its depth about 22-30% of standard length; scutes strongly keeled, 1 or 2 before base of first pectoral finray, 11-12 + 8; snout pointed; lower jaw not projecting, included in upper when mouth closed, with small teeth at symphysis; maxilla blade slender, more than 3 times as long as deep, upper edge with a ridge flared outward; second supra-maxilla small, shaft as long as spatulate blade; lower gillrakers 18-22; total anal finrays 18-21; scales in lateral series 37-40 (Ref. 188, 47399). It resembles Microthrissa royauxi, which has fewer gillrakers but more anal finrays, 14-16 and 23-27 respectively (Ref. 188).

Description: Body depth 21.7-30.0% of standard length; head length 11.1-12.7% of standard length (Ref. 188, 93833). Premaxilla with 12-30 conical teeth directed inwards; 11-25 little conical teeth on maxillary (Ref. 47399). Dorsal fin origin closer to snout than caudal fin base, inserted behind pelvic fin base; dorsal fin with 12-15 fin rays; anal fin with 18-21 fin rays; ventral fin with 1 unbranched and 6 branched rays; pectoral fin with 10-13 fin rays (Ref. 47399, 93833). Cycloid scales; 37-43 on longitudinal line (Ref. 47399). First gill arch with 18-22 gillrakers on lower limb, 27-32 total gillrakers (Ref. 47399). Scutes present: 1-2 prepectoral scutes without ascending arms, 10 prepelvic scutes with ascending arms, 1 subpelvic scute without ascending arms, 7 postpelvic scutes with ascending arms; strongly keeled (Ref. 93833). Vertebrae 40-44 (Ref. 47399).

Colouration: Silvery, occiput blackish and contrasting; a weak pigmented trace on caudal peduncle ending in a small black spot at base of lower lobe of caudal fin (Ref. 47399, 93833).

Ease of Identification

Meristic characteristics of Microthrissa minuta

Lateral Lines Interrupted: No
Scales on lateral line 37 - 43
Pored lateral line scales
Scales in lateral series
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 - 22
on upper limb
total 27 - 32
total 40 - 44


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 18 - 21

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   7 - 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