Morphology Data of Photonectes paxtoni
Identification keys
Abnormalities
Main Ref. Flynn, A.J. and C. Klepadlo, 2012
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
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

This species is distinguished from other members of the subgenus Photonectes in the following set of characters: short barbel with a very enlarged ovoid terminal bulb without terminal appendages; no blue luminous tissue; reduced length of gill filaments on first branchial arch, less than arch depth; VAV photophores 15-16 (vs. 0-15), AC photophores 13 (vs. 9-12), IV photophores 29 (vs. 30-46); bulb is plain (without filaments) and remarkably large. This species is similar to P. ovibarba (synonym of P. braueri) in having an enlarged bulb but is without pectoral fins (vs. present, with 2 rays each), IV photophores 29 (vs. 32-33), AC photophores 13 (vs. 10-12), the bulb has no terminal appendage (vs. bearing a small ovoid appendage); from another species with a large bulb, P. fimbria (synonym of P. parvimanus), IV photophores 29 (vs. 43-49), IP photophores insert halfway along the isthmus, or with gap (vs. insert near mandibular symphysis or no gap), no thick skin (vs. thick skin over dorsal- and anal-fin rays), no flap or terminal appendage; growth change unknown (vs. bulb with terminal flap increasing with growth) (Ref. 92891).

Ease of Identification

Meristic characteristics of Photonectes paxtoni

Lateral Lines Interrupted: No
Scales on lateral line
Pored lateral line scales
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

Fins

Dorsal fin(s)

Attributes
Fins number
Finlets No. Dorsal   
Ventral  
Spines total
Soft-rays total 16 - 18
Adipose fin

Caudal fin

Attributes

Anal fin(s)

Fins number
Spines total
Soft-rays total 18 - 18

Paired fins

Pectoral Attributes  
Spines     
Soft-rays   0 - 0
Pelvics Attributes  
Position    
Spines     
Soft-rays   7 - 7
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