Eleven miscellaneous papers on animal parasites / [Ch. Wardell Stiles and others].

Date:
1902
Catalogue details

Licence: In copyright

Credit: Eleven miscellaneous papers on animal parasites / [Ch. Wardell Stiles and others]. Source: Wellcome Collection.

Provider: This material has been provided by London School of Hygiene & Tropical Medicine Library & Archives Service. The original may be consulted at London School of Hygiene & Tropical Medicine Library & Archives Service.

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    AN EGYPTIAN AND JAPANESE STRONGYLE (STRONGYLUS SUB- TILIS) WHICH MAY POSSIBLY OCCUR IN RETURNING AMERICAN TROOPS. By Ch. W^utDELL Stiles, Ph. D., Pathologist of Bureau of Animal Industry [Plate V, figures 14-21.] Among the parasites not known at present for North America, which must be considered in. connection with the return of American troops from the East, should be mentioned a very small strongyle found in the stomach and upper portion of the small intestine. This nematode was first discovered in Japan by Ogata, then in Egypt, by Looss, and was referred to later b}^ Ijima from Japan. The presence of the worm in those two countries, so widely separated geographic- ally, would seem to indicate an extensive geographical distribution for the species. The parasite ili question is a roundworm belonging to the family Strongylidse, and is usually placed in the genus Strongylus. This genus contains rather a heterogeneous assemblage of worms which will later undoubtedly be divided into several genera, and a general system- atic revision of the family Strongylidte will eventually result in cer- tain important changes in the*technical names. For the purpose of this article the generally adopted nomenclature will be followed. Genus Stbongylus. Generic diagnosis.—Strongylidse: Body slender; anterior extremity occasionally with alse. Mouth small, without teeth, lips soft, often indistinct, papilla3 very small. Bursa (male) entire, or excised ventrally, in some cases bi-, tri-, or multi-lobed; spic- ules 2, often with accessory piece. Vulva usually in caudal half of body; uterus with two horns. Strongylus subtilis Looss, 1895. Specific diagnosis.—Strongylus: Very small, 4 to 7 mm. long; cuticle with exceed- ingly fine transverse striation; oral papillfe exceedingly small and inconspicuous; longitudinal lines well developed; lateral lines more prominent than the median. Buccal cavity short, funnel-shaped; esophagus (0.75 mm. by 7 to 30 /<) nearly one- sixth as long as body, differentiated histologically into anterior and posterior por- tions, and containing well-developed dorsal esophageal gland which discharges at its anterior extremity; intestine short, 13 /< in diameter. Nervous system about 0.16 mm. from anterior extremity. Excretory pore about 0.19 mm. from anterior extremity; cervical glands well developed, one extending posterior of the other and for nearly the length of the esophagus posterior of this organ. Male.—Four to 5 mm. long, increasing in diameter from 9 jii at anterior end to 70 near the bursa. Testicle single, beginning near the posterior end of cervical gland; Synonymy and Bibliography. (1889): Strongylus [sp.] Ogata, 1889, No. 578. [After Ijima.] 1895: Strongylus subtilis Looss, 1895, pp. 161-169, pi. 1, figs. 1-8.—Idem, 1896, pp. 864-865.—Ijima, 1896, pp. 155-159.—E. BLANcnAitu, 1895, p. 810.—Delai'ield & Prudden, 1897, p. 137.—Stossich, 1899, p. 79.—Stiles, 1902, pp. 41-42, figs. 14-21.