The Small Strongyles

Species and morphology

The small strongyles include 40 or so species that commonly infect the cecum and colon of horses and donkeys. Approximately 30 of these have been assigned to the subfamily cyathostominae. Thus they are commonly called the Cyathostomes.

They vary in size from 6 to 22mm in length with a reasonably well developed buccal capsule that is also much smaller than those seen in the large strongyles. Species are differentiated on the basis of size, characteristics of the buccal capsule and, in particular,  the arrangement of internal and external leaf crowns. The image to the right shows the head end of a cyathostomum species with its obvious buccal capsule and with a prominent external leaf crown at its apex..

 

smstrheadsm.jpg (17687 bytes)

Image courtesy of Merial Inc

Superfamily

Family Subfamily Genus
- examples

Strongyloidea

Strongylidae

Strongylinae
(large strongyles)
Strongylus
Triodontophorus
Cyathostominae
(small strongyles)
Cyathostomum
Cylicostephanus
Cylicocyclus
Cylicodontophorus
Poteriostomum
Gyalocephalus


    

 

Parasites and Parasitic Diseases of Domestic Animals
Dr. Colin Johnstone (principal author)
Copyright 1998 University of Pennsylvania
This page was last modified on January 24, 2000