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Botanica Marina

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Volume 56, Issue 5-6


Hydrolithon abyssophila sp. nov. (Hydrolithoideae, Corallinales), a bisporic coralline from the insular shelf edge of Puerto Rico and the Virgin Islands (US)

Athanasios Athanasiadis / David L. Ballantine
  • Department of Marine Sciences, University of Puerto Rico, Mayagüez, Puerto Rico 00681, USA
  • Department of Botany, National Museum of Natural History, Smithsonian Institution, Washington, DC 20560, USA
  • Other articles by this author:
  • De Gruyter OnlineGoogle Scholar
/ Hector Ruiz
Published Online: 2013-10-29 | DOI: https://doi.org/10.1515/bot-2013-0019


A new species of Hydrolithon is described from mesophotic habitats, between 30 and at least 76 m depth, off La Parguera, Puerto Rico, and St Thomas, Virgin Islands (Caribbean Sea). Its encrusting thallus covers corals and rocks. Hydrolithon abyssophila sp. nov. is distinctive in developing bisporangia that are about twice as large as its congeners and in lacking both perithallial protuberances and trichocytes in horizontal or vertical groups. It reproduces primarily by uninucleate bispores that presumably recycle the parental phase. Unfertilized carpogonia were observed in one collection suggesting the rare occurrence of gametophytic reproduction in the species.

Keywords: Caribbean Sea; Hydrolithon; mesophotic zone; Porolithon; taxonomy; uninucleate bispores


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About the article

Corresponding author: Athanasios Athanasiadis, University of Gothenburg, Marine Botany, P.O. Box 461, SE 405 30 Gothenburg, Sweden, e-mail:

Received: 2013-02-27

Accepted: 2013-09-26

Published Online: 2013-10-29

Published in Print: 2013-12-01

Citation Information: Botanica Marina, Volume 56, Issue 5-6, Pages 495–505, ISSN (Online) 1437-4323, ISSN (Print) 0006-8055, DOI: https://doi.org/10.1515/bot-2013-0019.

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