Morphology Data of Aulotrachichthys nyx
Identification keys
Abnormalities
Main Ref. Su, Y., H.-C. Ho and H.-C. Lin, 2023
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
Cross section compressed
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

This species is disinguished from its congeners by having the following set of characters: striated area extending posteriorly, slightly beyond middle point on the caudal peduncle, its length 66.7% caudal-peduncle length; D V,13; A III,8; gill rakers on first gill arch 6 + 1 + 14 = 21; abdominal scutes 9; lateral-scale rows 58; body height 34.1% SL; pelvic-fin-anal-fin length 30.3% SL; forehead height 2 4.1% SL; pectoral-fin length 18.1% SL; dorsal-fin-anal-fin length 42.6% SL; dorsal-fin length 35.3% SL; postdorsal length 29.6% SL; length between the end

of the anal-fin base to the end of the striated area (A-SA length), 12.4% SL. Colouration: body overall dark-brown, with chest, isthmus, and abdominal scutes uniformly black, and a distinct black vertical line along caudal-fin base (Ref, 129295),

Ease of Identification

Meristic characteristics of Aulotrachichthys nyx

Lateral Lines Interrupted: No
Scales on lateral line 28 - 28
Pored lateral line scales
Scales in lateral series
Scale rows above lateral line 10 - 10
Scale rows below lateral line 18 - 18
Scales around caudal peduncle
Barbels
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb
total 21 - 21
Vertebrae
preanal 13 - 13
total 27 - 27

Fins

Dorsal fin(s)

Attributes
Fins number 1
Finlets No. Dorsal   
Ventral  
Spines total 5 - 5
Soft-rays total 13 - 13
Adipose fin

Caudal fin

Attributes

Anal fin(s)

Fins number 1
Spines total 3 - 3
Soft-rays total 8 - 8

Paired fins

Pectoral Attributes  
Spines     0
Soft-rays   12 - 12
Pelvics Attributes  
Position    
Spines     1
Soft-rays   6 - 6
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