102 Bulletin of Zoological Nomenclature SCHISTODERA COBB, 1920 (NEMATODA: ENOPLIDA), A REQUEST FOR SUPPRESSION; OXYSTOMINA FILIPJEV, 1921 PROPOSED FOR THE OFFICIAL LIST. Z.N.(S.)2031 By W. D. Hope (Department of Invertebrate Zoology, National Museum of Natural History, Washington, D.C. 20560) and D. G. Murphy (National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, Maryland, 20014) Oxystomina Filipjev, 1921 (:565) is the type-genus of the marine nematode super-family Oxystominoidea Chitwood, 1935. Filipjev (1921) proposed the name Oxystomina as a replacement of Oxystoma Biitschli, 1 874 ( : 270) which is preoccupied by Oxystoma Dumeril, 1806 (Insecta). 2. Among the several names that have been accepted by systematists as synonyms of ^Oxystomina, two have publication dates earlier than that of Oxystomina, i.e., Acoma Steiner, 1916, and Schistodera Cobb, 1920. Acoma Steiner, 1916, is a junior homonym of Acoma Casey, 1890 and is, therefore, invalid. 3. Schistodera, which is an available name has been used on but one occasion since it was first published by Cobb (1920); this was in "A Synopsis of the Families and Genera of Nematoda" by Baylis and Daubney (1926). Here, both Schistodera and Oxystomina were listed as separate valid genera. Further, these authors were aware that Oxystoma Biitschli, 1874 was preoccupied, and they renamed the genus "Oxystomina" with the note that "The name Oxystomina has, we believe, been proposed to replace the preoccupied name Oxystoma. We are unfortunately unable to trace its author and date of publication" (p. 97). Thus, Oxystomina sensu Bayhs and Daubney, 1926, is both a junior homonym and a junior synonym of Oxystomina Filipjev, 1921. 4. Since Baylis and Daubney's publication, Schistodera Cobb, 1920 has been listed as a "junior" synonym of Oxystomina Filipjev, 1921 in every instance where it has appeared in the literature (Coninck, L. A. de, 1965; FiUpjev, I. N., 1934; Kreis, H. A., 1929; Schuurmans Stekhoven, J. H., 1935; and Wieser, W., 1953). That Oxystomina has been accepted as the valid name of the genus in question is further evidenced by the additional occasions (Allgen, C, 1932; Chitwood, B. G., 1937; Filipjev, I. N., 1927; Gerlach, S. A., 1954; Vitiello, P., 1970; and others) upon which it has been used, even though the name Schistodera was not cited as a synonym or otherwise mentioned. 5. In view of the general acceptance of Oxystomina Filipjev, 1921 as the valid name of the genus in question by those concerned with the systematics of marine nematodes, and of the inconvenience that would result in changing the name of this genus the International Commission on Zoological Nomen-clature is asked: •The spelling of Oxystomina has been modified by Schuurmans Stekhoven (1935) and others to Oxystomalina. The latter name is an unjustified emendation and is, therefore, a junior objective synonym of Oxystomina. Bull. zool. Nomencl, Vol. 30, Part 2. October 1973.