- Elongate, filiform tapering narrower at
anterior end.
- Cuticle with numerous fine, longitudinal
striations.
- Cephalic region with 3 minute lips, each
with 2 small papillae.
- Esophagus claviform in outline, excretory
pore well anterior to esophageal-intestinal junction.
- Intestine filled with blood from host.
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Male:
- Tail curved ventrally.
- Bursa small, incomplete, 2 sides not joined anteriorly or
posteriorly.
- Ventral and lateral rays of bursa long, narrow. Dorsal ray
absent, but 2 small and delicate papillae present. External dorsal
rays present, elongate and narrow.
- The reduction of the dorsal ray to 2 small widely separated
papillae is a distinguishing feature.
- Spicules thin, elongate and well developed.
- Gubernaculum present.
Female:
- Prodelphic with simple ovejector.
- Vulva at posterior end just anterior to anus, tail short.
- Oviparous, eggs elliptical with early development of juveniles.
- Eggs deposited into blood stream, and larvae hatch in lungs of
host.
Ref: Morales et al., 2012
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