Main Ref.	Williams, E.H. Jr. and L. Bunkley-Williams, 1996
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	Length: 0.10 - 0.21 cm . A bullet-shaped fluke with the oral and ventral suckers less than 1 ventral sucker width apart. Oral sucker: Approximately 1/3 the width of the ventral sucker. Tail: usually extended from the body, but can be contracted into the body, and is more than 1/3, but less than 1/2 the total body length (when extended). Compact and rounded lobe of vitellaria is posterior to the ovary. Testes: touching or slightly separated, side-by-side on a slight diagonal, just posterior to or slightly under the ventral sucker. Egg-filled uterus does not extend to the end of the intestinal ceca or into the tail. Intestinal ceca either do not extend into the tail or just barely do so (Ref. 359).
Ease of Identification	likely to be confused with closely related species.

Meristic characteristics of Sterrhurus musculus

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