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Range extension and morphological characterization of rhodolith-forming species (Corallinales,Rhodophyta) from shallow water in the Mexican South Pacific
Authors:Edith Concepción Peralta-García  Edgar Francisco Rosas-Alquicira
Affiliation:1. Programa de maestría en Ciencias, Departamento de recursos del Mar, Cinvestav-IPN, Unidad Mérida. Antigua carretera a Progreso Km 6, Cordemex, C. P. 97310, Mérida, Yucatán, Mexico
2. Instituto de Recursos, Universidad del Mar, Campus Puerto ángel. Ciudad Universitaria, C. P. 70902, Puerto ángel, Oaxaca, Mexico
Abstract:Living rhodolith beds are widely distributed along the Eastern Pacific ocean. Despite their widespread distribution, little is known about the rhodolith-forming species from shallow water in the Mexican South Pacific. Many taxonomic and morphological studies about rhodoliths have been carried out in the Gulf of California, where the forming species belong to the Hapalidiaceae and Corallinaceae families. This paper is the first report on the occurrence of the rhodolith-forming Hapalidiaceae species Lithothamnion muelleri and Phymatolithon repandum at three sites in the Mexican South Pacific. The branch density, maximum length and sphericity were measured for each determined species. Rhodoliths were distributed between 4 and 6 m depth, but differences in the branch density between species and sites were not found. Finally, the present record of L. muelleri fills the gap in the species distribution along the Eastern Pacific ocean, while the record of P. repandum is the first of the species in the region.
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