Morphology Data of Tyttobrycon marajoara
Identification keys
Abnormalities
Main Ref. Marinho, M.M.F., D.A. Bastos and N.A. Menezes, 2013
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance always different morphology between mature adults
Different colors
Remarks Presence of spines and hooks on fins only in males; tiny spines laterally located on unbranched dorsal-fin rays; hooks on all pelvic-fin rays and on last unbranched and first five or six branched anal-fin rays. Males have shallower body depth and longer pectoral and pelvic fins than females; and medial portion of pelvic bone of males expanded and dorsally projected (Ref. 94718).

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral fusiform / normal
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

This species differs from all members of the genus Tyttobrycon by the possession of tricuspid premaxillary teeth, tri- or pentacuspid maxillary teeth and four broad tricuspid anterior dentary teeth (vs. all teeth conical in the jaws). It can be further diagnosed from all congeners, except T. dorsimaculatus, by having 5-7 premaxillary teeth (vs. 8-9), and from T. dorsimaculatus by having only scattered melanophores on the dorsal fin (vs. dorsal fin with a conspicuous black spot). The presence of adipose fin separates this species from T. hamatus and T. spinosus (vs. adipose fin absent) (Ref. 94718).

Description: Dorsal-fin rays ii,8-9; anal-fin rays iii-iv,12-14; pectoral-fin rays i,8-10; pelvic-fin rays i,7; 3 longitudinal scale rows below lateral line at pelvic-fin origin; 28- 31longitudinal scale row, including pored scales (Ref. 94718).

Ease of Identification

Meristic characteristics of Tyttobrycon marajoara

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales 3 - 5
Scales in lateral series
Scale rows above lateral line 4 - 4
Scale rows below lateral line
Scales around caudal peduncle 12 - 12
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total
Vertebrae
preanal 13 - 14
total 31 - 33

Fins

Dorsal fin(s)

Attributes no striking attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total
Soft-rays total 10 - 11
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   9 - 11
Pelvics Attributes  more or less normal
Position    abdominal  behind origin of D1
Spines     
Soft-rays   8 - 8
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
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