Abstract
Acasta sulcata spinosa Daniel, 1955 has been discovered to be a junior homonym of Acasta spinosa Hiro, 1939. As both names were originally described in the genus Acasta, ICZN (International Commission on Zoological Nomenclature) Article 57.2 defines A. sulcata spinosa as a primary junior homonym, even though it is of subspecific nature.
References
Daniel, A. (1955) The Cirripedia of the Madras Coast. Bulletin of the Madras Government Museum (Natural History Society), new series 6 (2), 1–40.
Hiro, F. (1939) Studies on the cirripedian fauna of Japan. IV. Cirripeds of Formosa (Taiwan) with some geographical and ecological remarks on the littoral forms. Memoirs of the College of Science, Kyoto Imperial University, Series B, 15 (2), 245–284.
International Commission on Zoological Nomenclature (1999) International Code of Zoological Nomenclature. Fourth edition. International Trust for Zoological Nomenclature, London, i–xxix + 306 pp.