Morphology Data of Diapoma obi
Identification keys
Abnormalities
Main Ref. Casciotta, J., A. Almirón, L. Piálek and O. Říčan, 2012
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks Males differ from females in the nearly straight or slightly convex distal border of the anal fin (vs. concave in females), first branched pelvic-fin produced in a short filament , hooks on anal and pelvic-fin rays (Ref. 91033).

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral short and / or deep
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales cycloid scales
Diagnosis

Distinguished by the following combination of characters: anal fin with 22-24 (mode=24) branched rays; body depth at dorsal-fin origin 34.5-40.8 % SL (mean=37.9 % SL); nearly straight distal border of anal fin in matures males; and lateral line interrupted or with alternated series of perforated and non perforated scales. Other characters useful to diagnose this species include the following: 7-14 sheath scales on anal-fin base; anal-fin base length 2.9-3.4 in SL; interorbital width 2.7-2.9 in HL; 34-38 scales on longitudinal series; horizontal eye diameter 35.9-42.1% SL; snout length 24.0-27.3 % HL; upper jaw length 42.0-46.9% HL; maxillary teeth 3-6; pelvic-fin length 14.5-18.1% SL; snout to pelvic-fin origin 44.4-50.6% SL; snout to anal-fin origin 59.4-65.3% SL; snout to pelvic-fin origin 44.4-50.6% SL (Ref. 91033).

Description: Anal-fin rays iv-v,22-24; lateral line never complete, with anterior series of 8 to 12 pored scales (mode=11), followed by a median non-perforated scales series, and a posterior perforated series of 1 to 3 scales; Tttal number of scales in longitudinal series 34-38 (mode=36) (Ref. 91033).

Ease of Identification

Meristic characteristics of Diapoma obi

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
Scales in lateral series 34 - 38
Scale rows above lateral line 5 - 6
Scale rows below lateral line
Scales around caudal peduncle
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total
Vertebrae
preanal
total 37 - 37

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number
Finlets No. Dorsal   
Ventral  
Spines total
Soft-rays total
Adipose fin present

Caudal fin

Attributes forked

Anal fin(s)

Fins number
Spines total
Soft-rays total

Paired fins

Pectoral Attributes  more or less normal
Spines     
Soft-rays   11 - 13
Pelvics Attributes  more or less normal
Position    abdominal  before origin of D1
Spines     
Soft-rays   7 - 7
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