Sebdenia dichotoma Berthold 1884

Publication Details
Sebdenia dichotoma Berthold 1884: 21, pl. 2

Published in: Berthold, G. (1884). Die Cryptonemiaceen des Golfes von Neapel. Fauna und Flora des Golfes von Neapel 12: 1-127.

Type Species
The type species (lectotype) of the genus Sebdenia is Sebdenia monardiana (Montagne) Berthold.

Status of Name
This name is of an entity that is currently accepted taxonomically.

Type Information
Type locality: Gulf of Naples, Italy, Mediterranean Sea; (Berecibar et al. 2009: 223)

Origin of Species Name
Adjective (Latin), dichotomous, having divisions always in pairs (Stearn 1983).

General Environment
This is a marine species.

Created: 18 December 1997 by M.D. Guiry.

Last updated: 28 August 2021

Verification of Data
Users are responsible for verifying the accuracy of information before use, as noted on the website Content page.

Taxonomic notes
John et al. (2004) cite Chrysymenia dichotoma J. Agardh and Halymenia dichotoma (J. Agardh) J. Agardh as synonyms of this species. - (11 May 2006) - G.M. Guiry
Sebdenia dichotoma (J. Agardh) Berthold 1884 is an illegitimate combination erroneously attributed to Berthold by Codomier (1973), but attributed to the latter author by Parkinson (Halymenia, ... 1980: 15). However, it is a later homonym of S. dichotoma Berthold 1884. The following nomenclatural discussion is kindly contributed by Professor Paul C. Silva on the subject: "The name Sebdenia has a long history. It first appeared in the list of species appended to Harvey's exsiccata "Ceylon Algae" (1857), The species was accepted as Sarcodia ? platycarpa Harvey n.sp., but with the note that it might be assigned to a new genus, for which Harvey proposed the name Sebdenia. These names are all nomina nuda because Harvey did not provide descriptions. The specific name Sarcodia platycarpa was validated by Grunow (Algen der Fidschi-, Tonga- und Samoa-Inseln gesammelt von Dr. E. Graeffe, p. 42-43. 1873/1874}, who provided a description taking into account Harvey's specimen and a Graeffe collection from Tongatabu. Grunow discussed the possibility of recognizing Sebdenia as a distinct genus, but did not accept the idea. J. Agardh (Sp. Alg. 3(1): 134. 1876) validly published Sebdenia as an unranked infrageneric taxon (presumably subgenus or section) of Halymenia. The three included species were Halymenia platycarpa (Harvey ex Grunow) J. Agardh, H. kallymenioides Harvey, and H. monardiana Montagne. Berthold (Mitt. Zool. Stat. Neapel 3: 530. 1882) elevated J. Agardh's unranked taxon to generic status, as Sebdenia (J. Agardh) Berthold, with two species: S. monardiana (Montagne) Berthold and S. dichotoma Berthold (nomen nudum). Berthold validated his Sebdenia dichotoma in his monograph of the Cryptonemiaceae of the Gulf of Naples (p. 21, pl. 2.1884). Schmitz (Flora 72: 444. 1889) designated S. monardiana as the type of the generic name. Codomier (Phycologia 12: 97. 1973) confused the nomenclature after determining that Chrysymenia dichotoma J. Agardh (Sp. Alg. 2(1): 211. 1851) was conspecific with Sebdenia dichotoma Berthold by writing (incorrectly) Sebdenia dichotoma (J. Agardh) Berthold. Nomenclaturally, the Agardh and Berthold names are independent. In effect, Codomier made the combination Sebdenia dichotoma (J. Agardh) Codomier, which is a later homonym of Sebdenia dichotoma Berthold." - (16 June 2006)

Habitat note
Attached to the rocky bottom at 15 m depth (Berecibar et al. 2009: 223). - (22 March 2010) - G.M. Guiry

Linking to this page: https://www.algaebase.org/search/species/detail/?species_id=1631

Citing AlgaeBase
Cite this record as:
M.D. Guiry in Guiry, M.D. & Guiry, G.M. 28 August 2021. AlgaeBase. World-wide electronic publication, National University of Ireland, Galway. https://www.algaebase.org; searched on 09 April 2025

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