Main Ref.	Cogger, H.G., 1975
Appearance refers to

Sex attributes

specialized organs
different appearance
different colors
remarks

Descriptive characteristics of juvenile and adult

Striking features
Body shape lateral
Cross section
Dorsal head profile
Type of eyes
Type of mouth/snout
Position of mouth
Diagnosis	The head and neck are moderately thin. Cream, grey or pale brown cross-bands with paler interspaces are wider dorsally and taper on the sides. Incomplete secondary dark bands between the primary ones may be present, with dark-centered scales on the paler parts of the body. Head is pale, bandings on the tail. More obscure than those on the body and in older adults. Head shields are irregular and fragmented in adults. Those around the eye are raised posteriorly to form spines. Prefrontal scales absent.
Ease of Identification

Meristic characteristics of Hydrophis peronii

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