. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 33 tral and closed by 6 striated membranous expansions or lips. Buccal capsule well developed, with C meridial ribs in its wall and with a dozen small teeth at its base, two of these, somewhat larger than the others, at the base of the dorsal gutter. Male 11 to 18 mm. long. Branches of dorsal ray of bursa (fig. 34) tridigitate, one of the subordinate branches often very slender. Spicules slender, 900/a to mm. long. Female 17 to 21 mm. long. Vulva (fig. 35) close to the anus and often covered by a cuticnlar e
. Bulletin - United States National Museum. Science. NEMATODE PARASITES OF BIRDS 33 tral and closed by 6 striated membranous expansions or lips. Buccal capsule well developed, with C meridial ribs in its wall and with a dozen small teeth at its base, two of these, somewhat larger than the others, at the base of the dorsal gutter. Male 11 to 18 mm. long. Branches of dorsal ray of bursa (fig. 34) tridigitate, one of the subordinate branches often very slender. Spicules slender, 900/a to mm. long. Female 17 to 21 mm. long. Vulva (fig. 35) close to the anus and often covered by a cuticnlar expansion. Eggs thin-shelled, 120 to 125//. by TO to 75/t, segmenting when deposited. Life history.—Unknown; probably simple and direct. Distribution.—South America (Brazil) and Europe (in museum material).. Figs. 33-35.—DelhtrcxXephamjs dimidiates. 33, Head ; a, lateral; b, front view. 34, Male BURSA. 35, Female tail. After Diesing, 1857 Family SYNGAMIDAE Leiper, 1912 Family diagnosis.—Strongyloidea (p. 29) : Worms permanently joined in copula (Syngamws) or not permanently joined (Cyathos- toma). Buccal capsule large, thick-walled and armed at the base with 6 to 9 teeth of 2 distinct sizes arranged about a center. Bursa membrane thick or of thickness usual in strongyles in other families; rays often short and thick, sometimes slender. Spicules short (Synga- mus) or long (Cyathostoma). Vulva usually in anterior half of body, rarely median or slightly Eggs operculated after deposition. Type genus.—Syngamus von Siebold, 1836. KEV TO GENERA OF SYNGAMIDAE 1. Worms permanently joined In copula. Buccal capsule usually with 8 or 9 teeth rarely 3 (error?). Bursa rays short and thick. Spicules small. 150^ or less. Vulva in anterior half of body Syngamus, p. 34. Worms not permanently joined In copula. Buccal capsule with (5 or 7 teeth rarely 2 (error'.'). Bursa rays slender. Spicules Long, over 40Qp. Vulva anterior, median or slightly posterior Cyathostoma, p.
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