Family Ascarididae
Revised
11/09/21
Spirurina
Ascaridoidea
Ascarididae
Blanchard, 1896
- A family of intestinal parasites of terrestrial vertebrates,
including humans and their domestic animals..
- Relatively large nematodes with lips which maybe simple or distinctly
subdivided on the internal surface,
- Anterior prolongations of labial papillae comprise a median internal
unpaired lobe and two external lobes; dorsal and subventral labial papillae
double, lateral papillae single.
- Cervical alae salient or not salient.
- Excretory cell with or without anterior prolongations.
- Eesophageal gland nuclei in posterior part of esophagus, dorsal nucleus
larger than subventral nuclei; duct of dorsal esophageal gland opens in the
anterior part of the esophagus, ducts of subventral glands open in posterior
part of the esophagus,
- Intestinal caecum absent.
- Female with vulva usually pre-, rarely post-equatorial; vagina about
half the length of the undivided part of uterus; paired uteri
opisthodelphic, ovarian coils mostly behind vulva; eggs with mamillated,
pitted or smooth shells.
- Male with non-alate, cylindrical or club-shaped, spicules; pericloacal
region with anterior median unpaired papilla, with or without rough areas in
front and behind cloacal opening.
- Other papillae in the male are bilaterally arranged and comprise a
latero-ventral irregular row of precloacal papillae, a pair of double
papillae behind the cloaca, and a posterior group towards the tip of the
tail.
- Ref: Sprent, 1968
Go to Dictionary of
Terminology
References
Gibson, D.I. 1983. Systematics of ascaridoid nematodes - a current
assessment. In:
Concepts in nematode systematics : Proceedings of an international symposium
held jointly with the Association of Applied Biologists, in Cambridge / edited
by A.R. Stone, H.M. Platt, and L.F. Khalil
Nadler, S.A. 1987. Biochemical and Immunological Systematics of Some
Ascaridoid Nematodes: Genetic Divergence between Congeners. The Journal of
Parasitology, 73:811-816
Sprent, J.F.A. 1968. Notes on Ascaris
and Toxascaris, with a definition of Baylisascaris gen.nov.
Parasitology 58:185-198.
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