Fottea 2024, 24(2):244-260 | DOI: 10.5507/fot.2024.001

A first approach to the study of epizoic diatoms on marine benthic macroinvertebrates in Atlantic Patagonian waters (San Jorge Gulf) with SEM description of the most abundant taxa: Cocconeis patagonica sp. nov., Pseudogomphonema kamtschaticum and Tabularia investiens

Adrián O. Cefarelli1, 2*, Catherine Riaux-Gobin3, Martín A. Varisco1, 2, Martha E. Ferrario4, 5, Cecilia Castaños6, Nelson D. Bovcon7, David M. Williams8
1 Instituto Multidisciplinario para la Investigación y el Desarrollo Productivo y Social de la Cuenca Golfo San Jorge, CONICET - UNPSJB, 9000 Comodoro Rivadavia, Argentina; *Corresponding author e-mail: cefarelliadrian@gmail.com
2 Instituto de Desarrollo Costero, Universidad Nacional de la Patagonia San Juan Bosco, 9000 Comodoro Rivadavia, Argentina
3 CRIOBE-UAR 3278 CNRS-IRCP-UPVD, 66860 Perpignan, France
4 División Ficología, Facultad de Ciencias Naturales y Museo, Universidad Nacional de La Plata, 1900 La Plata, Argentina
5 CONICET, C1425FQB Ciudad Autónoma de Buenos Aires, Argentina
6 Grupo de Investigación y Desarrollo Tecnológico en Acuicultura y Pesca, Facultad Regional Chubut, Universidad Tecnológica Nacional, 9120 Puerto Madryn, Argentina
7 Instituto de Investigación de Hidrobiología, Facultad de Ciencias Naturales y Ciencias de la Salud, Universidad Nacional de la Patagonia San Juan Bosco, 9100 Trelew, Argentina
8 Department of Life Sciences, the Natural History Museum, London, United Kingdom

Numerous organisms play a host role for a variety of marine and freshwater diatoms and many have yet to be studied in detail. In particular, along the Argentine coast, there have been very few studies on epizoic diatoms. Through the analysis of ascidians, decapods, echinoderms and gastropods sampled from Atlantic Patagonian waters (San Jorge Gulf), this is the first study in the region on epizoic diatoms found on benthic macroinvertebrates. Thirty-one potential host samples, including 14 macroinvertebrates taxa, were examined from different stations. The epizoic diatom taxa found at the highest relative abundance, namely Cocconeis patagonica sp. nov., Pseudogomphonema kamtschaticum and Tabularia investiens, were analyzed using light and electron microscopy, and hence they are described in detail and compared with other species. Cocconeis patagonica sp. nov. belongs to the C. scutellum complex, but its particular raphe-valve (RV) valvocopula ultrastructure and striation defines it as new. Diagnostic characters are discussed for T. investiens. Pseudogomphonema kamtschaticum is reported for the first time in the Atlantic Patagonian waters.

Keywords: Atlantic Patagonian coast, benthic macroinvertebrates, Cocconeis, epizoic diatoms, Pseudogomphonema, San Jorge Gulf, Tabularia

Received: July 29, 2023; Revised: December 29, 2023; Accepted: January 3, 2024; Prepublished online: July 29, 2024; Published: October 22, 2024  Show citation

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Cefarelli, A.O., Riaux-Gobin, C., Varisco, M.A., Ferrario, M.E., Castaños, C., Bovcon, N.D., & Williams, D.M. (2024). A first approach to the study of epizoic diatoms on marine benthic macroinvertebrates in Atlantic Patagonian waters (San Jorge Gulf) with SEM description of the most abundant taxa: Cocconeis patagonica sp. nov., Pseudogomphonema kamtschaticum and Tabularia investiens. Fottea, 24(2), 244-260. doi: 10.5507/fot.2024.001
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