230 Bulletin of Zoological Nomenclature 56(4) December 1999 Case 3075 Stroitffylus tetracanthus Mehlis, 1831 (currently Cyathostomum tettacanthuni) and C catinatum Looss, 1900 (Nematoda): proposed conservation of usage by the designation of a neotype for C. tettacanthum L.M. Gibbons The Royal Veterinarv College, University oj London, Hawksheiid Lane, North Mymms, Hatfield, Herts AL9 7TA. U.K. (e-mail:
[email protected]) J.R. Lichtenfels Bio.iysteniatics and National Parasite Collection Unit, Agricultural Research Service. U.S. Department of Agriculture. Bldg. 1180, BARC-East, Beltsville, Maryland 20705-2350, U.S.A. (e-mail:
[email protected]) Abstract. The purpose of this application is to conserve the usage of the names Cycitlwstonmm letracantlmm (Mehlis, 1831) and C catinatum Looss, 1900 for two cyathostome nematodes (superfamily strongyloidea) parasitic in the intestines of horses and related animals. A lectotype for C. tetracuntlnim designated by Hartwich (1986) would make this name a senior synonym of C. catinatum, and it is proposed that this designation be set aside; a neotype is proposed for Strongylus tetracantlws Mehlis, 1831 (the type species of Cvar/w.v/owwn Molin, 1861), and the same specimen is designated as the lectotype of Trichonema aegyptiacum Railliet, 1900; the latter name had been established for C. tetracuntlnim as understood in modern times. Keywords. Nomenclature; taxonomy; Nematoda; strongyloidea; Cyatliostomum: Cyatlwstomum tetracantimm; Cyatliostomum aegyptiacum; Cyathostomum catinatum; nematodes; strongylid worms; cyathostomes; horse parasites. 1 . Mehlis (1831, p. 79) established the nominal species Strongylus tetracanthus for nematodes parasitic in the large intestine of horses in Germany. Gurlt (1831, p. 355) gave a more extensive description of S. tetracanthus Mehlis, referring to large and small "varieties" which represent adults and probable fourth stage larvae curled in the mucosa. Gurlt noted that a briefly described species S. armaius Rudolphi, 1 802 might have been included in the material called S. tetracanthus by Mehlis, but he adopted the latter name and the unidentifiable S. armatus has not been used as a valid name for a taxon in the past 130 years. 2. Diesing (1851, p. 305) placed Strongylus tetracanthus in the genus Sclerostoma Rudolphi. 1808, and regarded Sclerostoma quadrideniaium Dujardin, 1845 (p. 258). small strongyles of farm horses, as being the same species. 3. Wedl (1856, p. 53) renamed Sclerostoma tetracantimm as S. hexacanihuni. because he saw two additional 'spines" on the anterior end and considered that this
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