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Male:
- Caudal alae that envelop the 3 pairs of
caudal papillae
- Sexual dimorphism, males shorter and
thinner than females.
- Mouth bounded by 3 lips; dorsal lip with 2
papillae, each sublateral lip with 1 papilla and 1 amphid.
- Esophagus with anterior cylindrical corpus,
short isthmus and posterior valved bulb.
- Tail in both sexes forming flexible
terminal process.
- Cuticle with transverse annulations and
longitudinal striations
- Lateral alae extending from level of nerve
ring to base of caudal alae.
- Nerve ring 109 um from anterior end.
- Excretory pore posterior to esophageral
bulb.
- Three pairs of caudal papillae; precloacal
pair situated on slightly inflated portion of caudal end, adcloacal
pair posteriorly directed, and postcloacal pair enclosed by caudal
alae.
- Prominent V-shaped cloacal lips.
- Spicule absent.
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Female:
- Lateral alae absent.
- Anus 204 um anterior of base of tail spike.
- Vulva in anterior half of body.slitlike, anterior lip coronoid
(beak-like), about 598 um from anterior
- Thick-walled ovijector, approximately 215 um long and
thin-walled vagina,
- Amphidelphic-opisthodelphic; 2 uteri extend posteriorly and when
filled with eggs reach posterior end of body cavity.
- Excretrory pore posterior to esophageal bulb and slightly
anterior to vulva..
- Egg, spindleform, one end pointed and unadorned, one end
truncate with blade-like adornment, slightly flattened on one side,
thin, smooth shell.
Distinguishing characteristices of the species:
- absence of a spicule
- egg morphology
- excretory pore position.
Four species of Pharyngodon, P. frenatusi, P.
intermicauda,, P. kuntzi and P. neyrae have been described
as lacking a spicule and having eggs with pointed ends.
Ref: Bursey et al., 2008
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