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New substitute name for the genus Dayus Steiner & Amaral, 1999 (Annelida: Polychaeta: Histriobdellidae)



The annelid genus Dayus was established by Steiner and Amaral (1999) for a single species Stratiodrilus cirolanae Führ, 1971 from South Africa. Nevertheless the genus name Dayus is preoccupied and was initially introduced by Mahmood (1967) for a typhlocybine leafhopper genus with Dayus elongatus Mahmood, 1967 as the type species from Singapore (Insecta: Hemiptera: Cicadellidae). Thus, the genus Dayus Steiner & Amaral, 1999 is a junior homonym of the genus Dayus Mahmood, 1967. According to Article 60 of the International Code of Zoological Nomenclature (ICZN 1999), I propose the new replacement name Steineridrilus nom. nov. for Dayus Steiner & Amaral, 1999. The resulting nomenclatural changes are summarized below.


Dayus, Histriobdellidae, Polychaeta, Annelida

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Führ, I.M. (1971) A new histriobdellid on a marine isopod from South Africa. South African Journal of Science, 67, 325–326.

ICZN (1999) International Code of Zoological Nomenclature, Fourth Edition. The International Trust for Zoological Nomenclature, London, 306 pp.

Mahmood, S.H. (1967) A study of the Typhlocybinae genera of the Oriental Region (Thailand, The Philippines and adjoining areas). Pacific Insects Monograph, 12, 1–52.

Steiner, T.M. & Amaral, A.C.Z. (1999) The family Histriobdellidae (Annelida, Polychaeta) including descriptions of two new species from Brazil and a new genus. Contributions to Zoology, 68 (2), 95–108. Available from: (accessed 15 April 2014)


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