Cylicostephanus bidentatus
(Ihle, 1925) Lichtenfels, 1975

Figures

Synonyms: Cylicostomum bidentatum Ihle, 1925; Cylicotetrapedon bidentatum (Ihle, 1925) Ihle, 1925; Trichonema bidentatum (Ihle, 1925) Yorke and Maplestone, 1926; Schulzitrichonema bidentatum (Ihle, 1925) Barus, 1963.

General: Tip of submedian papillae cone-shaped, 2 times as long as thick. ELC with16 elements; ILC with 22. Elements of ELC triangular, longer than broad. Tip of ELC pointed. Insertion for ELC on tips of elements of ILC. Elements of ILC are oval-shaped and longer than broad. Tips of elements of ILC rounded. Insertion for ILC at 1/4 or less of BC depth. Septum intracoronare origin placed on BC. Walls of BC straight, thicker anteriorly. Buccal cavity wider than deep. Dorsal gutter elongate, more than 1/2 depth of BC. Esophageal funnel enlarged; lined with exceptionally thick cuticle. Subventral esophageal teeth exceptionally large; protrude into buccal cavity. Anterior deirids 210-229 from anterior end.

Male: Body length 5.7- 7.5 mm. Esophagus length 410-530. BC width 60; depth 21 dorsally and 33 ventrally. Spicule length 1.120 mm. Gubernaculum with large handle, ventral notch inconspicuous; length 180-192. Dorsal ray length 430. Ventral rays longer than laterals. Dermal collar well developed on ventral side of genital cone. Appendages of genital cone paired conical protrusions, with fingershape apendage on each. Paired, long, pointed protrusions of dermal collar present.

Female: Body length 9.5 mm. Esophagus length 530. BC width 40-68; depth 20-29. Vulva to anus 145. Anus to tail tip 110. Egg size 95-105 x 44-48. Infundibulum length about equal to sphincter length. Tail of mature female digitiform, straight, tip pointed; sublateral protrusions undeveloped

Hosts: Equus caballus, E. asinus,E. caballus X E. asinus, E. przewalskii, E. hemionus, E. burchelli

Locality: cecum, colon.

Distribution: cosmopolitan.