Myrionema expansum J.Agardh 1847

Publication Details
Myrionema expansum J.Agardh 1847: 7

Published in: Agardh, J.G. (1847). Nya alger från Mexico. Öfversigt af Kongl. Vetenskaps-Adademiens Förhandlingar, Stockholm 4: 5-17.

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Type Species
The type species (holotype) of the genus Myrionema is Myrionema strangulans Greville.

Status of Name
This name is currently regarded as a synonym of Neoralfsia expansa (J.Agardh) P.-E.Lim & H.Kawai ex Cormaci & G.Furnari.

Source of Synonymy
Cormaci, M., Furnari, G., Catra, M., Alongi, G. & Giaccone, G. (2012). Erratum. Flora marina bentonica del Mediterraneo: Phaeophyceae. Bollettino dell'Accademia Gioenia di Scienze Naturali di Catania 45: 509-510.

Type Information
Type locality: Veracruz, Mexico; (Silva & al. 1996: 573) Type: C; (Yoshida 1998) Notes: According to Leon-Alvarez & González- González (2003: 613), the holotype of Ralfsia expansa (J. Agardh) J. Agardh [Agardh 1847, as Myrionema (?) expansum] was collected by Liebman from an unspecified area on the east coast of Mexico in Veracruz. The type specimen was sterile and an incomplete description of the taxon was published by Agardh in 1848.

Origin of Species Name
Participle A (Latin), expanded, spread out (Stearn 1983).

General Environment
This is a marine species.

Created: 31 July 1999 by M.D. Guiry.

Last updated: 13 February 2015

Verification of Data
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Taxonomic note
According to Leon-Alvarez & González-González (2003:613), the holotype of ... Ralsia expansa (J. Agardh) J. Agardh [Agardh 1847, as Myrionema(?) expansum] ... was sterile, and an incomplete description of the taxon was published by Agardh in 1848. Two subsequent studies described the species and included the reproductive structures: Borgesen (1912) and Tanaka & Chihara (1980a). However, these descriptions differ from one another and may indicate different species. Leon-Alvarez & González-González (2003:613, 620) conclude that specimens of Ralfsia expansa sensu Tanaka & Chihara (1980a), described in previous reports from the Pacific coast of Mexico, are actually R. hancockii. They consider R. expansa sensu Borgesen to be a distinct species, typically found on the tropical Atlantic coast. Lim et al. (2007: 464) cite Myrionema expansum J. Agardh 1848:7 as basionym of Neoralfsia expansa (J. Agardh) Lim & Kawai 2007. - (11 May 2006) - G.M. Guiry

Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=19522

Citing AlgaeBase
Cite this record as:
G.M. Guiry in Guiry, M.D. & Guiry, G.M. 13 February 2015. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 02 April 2025

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