Morphology Data of Hippichthys heptagonus
Identification keys
Main Ref. Herre, A.W.C.T., 1927
Appearance refers to Male; Female
Bones in OsteoBase

Sex attributes

Specialized organs other
Different appearance always different morphology between mature adults
Different colors
Remarks Males with brood pouch; females with ovipositor (Ref. 205).

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral eel-like
Cross section compressed
Dorsal head profile clearly concave
Type of eyes more or less normal
Type of mouth/snout tube-like
Position of mouth terminal
Type of scales bony plates or armour

Preserved color dusky greenish gray; underside of head whitish; ventral keel and caudal fin blackish. Body: trunk heptagonal; very long tail 4-sided; covered with finely-sculptured plates with fine ridges; knife-like keel on the belly made up of sculptured plates. Head conical posteriorly; large elongate snout very narrow with concave plates; operculum with prominent median longitudinal keel; nape with a median crest. Dorsal fin only at the first 6 rings of tail; pectoral and caudal fins small.

Ease of Identification

Meristic characteristics of Hippichthys heptagonus

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 0
Gill clefts (sharks/rays only)
Gill rakers
on lower limb
on upper limb


Dorsal fin(s)

Attributes other
Fins number 1
Finlets No. Dorsal   
Spines total 0 - 0
Soft-rays total 22 - 30
Adipose fin absent

Caudal fin

Attributes forked; more or less normal

Anal fin(s)

Fins number
Spines total
Soft-rays total

Paired fins

Pectoral Attributes  more or less normal
Spines     0
Soft-rays   13 - 16
Pelvics Attributes  suppressed/absent
Position    absent
Main Ref. (e.g. 9948)
Glossary ( e.g. cephalopods )
Entered by Capuli, Estelita Emily
Modified by Froese, Rainer
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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