Morphology Data of Hymenocephalus longipes
Identification keys
Abnormalities
Main Ref. Schwarzhans, W., 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
Cross section angular
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Type of scales
Diagnosis

Distinguished by the following characters: pelvic fin rays 8; pectoral fin rays 13-15; black-colored tips of pelvic fins; barely projecting snout; head bones are rather firm; no barbel; orbit diameter 28-33% HL; interorbital width 40-50% HW (head width); gill rakers 19-21; ventral striae reaching close to periproct; otholith length to height (OL:OH) is 1.1-1.25; total colliculum length to pseudocolliculum length (TCL:PCL) is 1.7-2.1 (Ref. 98298).

Description: head with rounded, soft-tipped and non-projecting snout, its length 15% HL, orbit diameter 28-33% HL, interorbital width 40-50% HW; head canals are well developed, infraorbital width 10-12% HL, supraorbital canal with 6 segments, width 5-10% HL, supratemporal canal indistinct, preopercular canal width 7-12% HL, postorbital-preopercular interspace 11-13% HL; small infranasal supporter; infraorbital supporter moderately widened throughout length below orbit, expanding beyond rear part of orbit, 80-100% OD; broad preopercular supporter, also blunt, with straight rear margin short (3-5% HL).

Otolith morphology: otolith moderately high bodied; OL:OH = 1.1-1.25; OL:OT about 4; large predorsal lobe with pointed tip, triangular in shape, rather gently inclining towards rear part of otolith with some undulation; irregular anterior rim, also broadly rounded to blunt, its posterior tip moderately pointed; deep ventral rim, smooth and regularly curved, deepest anterior of middle; inner face very slightly convex along horizontal axis, with median sulcus; ostial and caudal colliculi moderately large, narrowly placed at collum, terminating at considerable distance from anterior and posterior tips of otolith; pseudocolliculum moderately enlarged. caudal colliculum length to ostial colliculum length (CCL:OCL), 0.9-1.0; TCL:PCL = 1.7-2.1; dorsal depression wide; ventral furrow thin, close to ventral rim (Ref. 98298).

Ease of Identification

Meristic characteristics of Hymenocephalus longipes

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
Adipose fin

Caudal fin

Attributes

Anal fin(s)

Fins number
Spines total
Soft-rays total

Paired fins

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