Morphology Data of Microthrissa congica
Identification keys
Abnormalities
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
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 terminal
Type of scales cycloid scales
Diagnosis

Diagnosis: Body slender, its depth about 20-24% of standard length; scutes strongly keeled, beginning under pectoral fin base, with 10-15 pre-pelvic and 8-11 post-pelvic scutes; snout rather blunt or acute; lower jaw not or slightly projecting, included in upper when mouth closed, with small teeth limited to anterior part; pre-maxillae with a single row of 24-42 small conical teeth directed inwards; maxilla slender, its blade more than 3 times as long as deep, upper edge quite strongly ridged; posterior supra-maxilla slender, spatulate, with distinct anterior shaft, shaft longer than blade; lower gillrakers 17-24 (Ref. 188, 47399). Also characterized by 26-35 scales in a longitudinal series and anal fin with 18-22 rays (Ref. 47399). It differs from Microthrissa moeruensis in having a distinctly blunter snout and less scales in longitudinal series (Ref. 188, 47399).

Description: Jaws equal anteriorly; maxillary extending to vertical from anterior edge of eye; pre-maxillary with 24-42 conical teeth; maxillary teeth quite distinct, 13-36; lower jaw with small teeth limited to anterior part (Ref. 188, 2263, 47399). Lower gillrakers on anterior arch 17-24 (Ref. 188, 47399, 93833). Dorsal fin base slightly behind origin of pelvic fins; pectoral fins not reaching pelvic fins; dorsal fin with 13-15 rays; anal fin with 18-22 rays; pectoral fin with 11-13 rays; pelvic fin with 8 rays (Ref. 47399). Cycloid scales; 26-35 scales in longitudinal series; 8 scales in transverse series (Ref. 2263, 47399). Scutes strongly keeled, beginning under pectoral fin base, with 10-15 pre-pelvic and 8-11 post-pelvic scutes; first 1-4 scutes without lateral arms (Ref. 188, 28136, 47399). Number of vertebrae 42-45; with 21-24 abdominal vertebrae and 19-22 caudal vertebrae (Ref. 47399).

Colouration: General colouration of preserved specimens yellow greyish colour with crystalline contour, ventral region and middle of flanks lighter coloured; tip of snout and occiput are pigmented with melanophores, as well as middle of the flanks (Ref. 47399). Lateral band narrow, present only on posterior half of fish (Ref. 2263).

Ease of Identification

Meristic characteristics of Microthrissa congica

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series 26 - 35
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 17 - 24
on upper limb
total 24 - 39
Vertebrae
preanal
total 42 - 45

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total 0 - 0
Soft-rays total 13 - 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 - 22

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   11 - 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 )
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