Morphology Data of Silvinichthys huachi
Identification keys
Abnormalities
Main Ref. Fernández, L., E.A. Sanabria, L.B. Quiroga and R.P. Vari, 2014
Appearance refers to
Bones in OsteoBase

Sex attributes

Specialized organs
Different appearance
Different colors
Remarks

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral elongated
Cross section
Dorsal head profile more or less straight
Type of eyes
Type of mouth/snout
Position of mouth sub-terminal/inferior
Type of scales
Diagnosis

Distinguished from Silvinichthys bortayro by the following characters: triangular shape of the head from a dorsal view (vs. more rectangular); 8-11 (vs. 2-4) opercular odontodes and 21-28 (vs. 9-12) interopercle odontodes apparent in cleared and stained specimens; 11-13 dorsal-fin rays (vs. 9); caudal-peduncle depth 8.8-10.9% SL (vs. 8.0-8.3% SL); snout length 43.3-61.9% HL (vs. 38.2-40.5% HL); head with broadly separated, dark, marmorated bands of pigmentation and body with a more concentrated, but still diffuse, patch of darker pigmentation overlying the dorsal surface of the cranium and the dorsal portions of the pectoral girdle (vs. lacks the dark marmorated pigmentation in larger individuals); absence of dark midlateral stripe on the caudal peduncle at all sizes (vs. presence of a dark midlateral stripe in mid-sized specimens). Differs from S. gualcamayo by the caudal peduncle length 19.3-21.5 % SL (vs. 22.0-23.9% ) and the insertion point of the first proximal dorsal-fin pterygiophore is posterior to the neural spine of vertebra 21 (vs. 22); from S. leoncitensis by having 37-39 vertebrae (vs. 40), 16-18 ribs on each side (vs. 20); 6-7 pectoral-fin rays (vs. 8), body depth 12.6-16.5 % SL (vs. 8.4-12.2% SL), caudal-peduncle depth 8.8-10.9% SL (vs. 6.6-8.6% SL), and the insertion point of the first proximal dorsal-fin pterygiophore posterior to the neural spine of vertebra 21 (vs. 23); and from S. mendozensis by the absence of pelvic fin and pelvic-fin girdle (vs. presence) and 21-28 (vs. 30-42) interopercle odontodes apparent in cleared and stained specimens (Ref. 95056).

Description: Dorsal fin with 3-5 unbranched rays and 7-8 branched rays; anal fin with 2-4 unbranched rays and 6 or 7 branched rays (Ref. 95056).

Ease of Identification

Meristic characteristics of Silvinichthys huachi

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales 3 - 3
Scales in lateral series
Scale rows above lateral line
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 - 39

Fins

Dorsal fin(s)

Attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total
Soft-rays total 11 - 13
Adipose fin absent

Caudal fin

Attributes more or less truncate

Anal fin(s)

Fins number
Spines total
Soft-rays total

Paired fins

Pectoral Attributes  
Spines     
Soft-rays   6 - 7
Pelvics Attributes  suppressed/absent
Position    absent
Spines     
Soft-rays   
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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