Typification of Conferva pectinalis O. F. Müll. (Bacillariophyceae) and the identity of the type of an alleged synonym, Fragilaria capucina Desm.

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Abstract:

The application of the generic name Fragilaria has remained uncertain because the identity of the lectotype, Conferva pectinalis O. F. Müll., is unknown. Traditionally Fragilaria capucina Desm. has been considered a synonym of F. pectinalis, although this synonymy has not been confirmed. Application of the generic name Fragilaria can best be fixed by designating an epitype for C. pectinalis that fits the current circumscription of the genus (sensu Williams & Round). As epitype for C. pectinalis, we designate a specimen that Dillwyn thought to be representative of that species. We also examined the type material of F. capucina. Specimens from this material have a rimoportula at each pole and open girdle bands. Although the first character was not part of the revised definition proposed by Williams & Round, F. capucina can be placed in Fragilaria on account of the structure of its striae and the general appearance of the basal siliceous layer. Fragilaria capucina is, however, clearly not a synonym of F. pectinalis.

Keywords: CONFERVA PECTINALIS; EPITYPE; EPITYPIFICATION; FRAGILARIA CAPUCINA; FRAGILARIA PECTINALIS

Document Type: Research Article

Affiliations: 1: Department of Botany, National Science Museum, Tokyo, Amakubo 4-1-1, Tsukuba, 305-0005, Japan; Department of Botany, The Natural History Museum, Cromwell Road, London SW7 5BD, U.K. 2: Department of Botany, The Natural History Museum, Cromwell Road, London SW7 5BD, U.K.

Publication date: February 1, 2006

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