Macrosporophycos sahyadricus (Batrachospermales, Rhodophyta), a new genus and species of freshwater red algae from the Western Ghats of India

IF 1.5 4区生物学 Q3 MARINE & FRESHWATER BIOLOGY

Phycologia Pub Date : 2023-03-04 DOI:10.1080/00318884.2023.2177062

P. S. Jayalakshmi, J. John

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Abstract

ABSTRACT A new genus of freshwater red algae, Macrosporophycos, and a new species, M. sahyadricus, are described from the Periyar River in the southern part of the Western Ghats, Kerala, India. Macrosporophycos shares distinctive characteristics with Montagnia, such as straight carpogonial branches having involucral filaments forming a rosette around the carpogonia, and pedunculate carposporophytes. However, the two genera have a raw genetic distance of 16.4%–17.0% for rbcL, and 24%–26.7% for COI-5P genes. The new species, Macrosporophycos sahyadricus, also possesses large, elongated, pear-shaped carposporangia. Phylogenetic analyses based on the concatenated rbcL and COI-5P recovered M. sahyadricus as a distinct lineage, sister to Acarposporophycos from South America. However, these genera are distinct from each other in their morphology. The morphological similarity, coupled with the high levels of genetic difference between Macrosporophycos and Montagnia, suggest convergent evolution in morphology. The recent records of new red algal taxa, including the discovery of this new genus, suggest that the Indian subcontinent continues to be under-explored and is in need of integrative taxonomic research supported by large-scale sampling.

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印度西高止山脉淡水红藻大孢子藻(batrachosper雄性，红藻门)一新属和种

摘要在印度喀拉拉邦西高特山脉南部的Periyar河中发现了一种新属(Macrosporophycos)和一新种(M. sahyadricus)。大孢子植物与山地植物具有明显的特征，如直直的具总苞花丝的茎形花序，在茎形花序周围形成莲座;而两属rbcL基因的原始遗传距离为16.4% ~ 17.0%，COI-5P基因的原始遗传距离为24% ~ 26.7%。这个新种，Macrosporophycos sahyadricus，也具有大的，拉长的，梨形的车孢子囊。基于rbcL和COI-5P序列的系统发育分析表明，M. sahyadricus是南美洲Acarposporophycos的姊妹系。然而，这些属在形态上彼此不同。大孢子藓和山地草在形态上的相似性，以及遗传上的高度差异，表明它们在形态上是趋同进化的。最近对新红藻分类群的记录，包括这一新属的发现，表明印度次大陆仍未被充分开发，需要大规模采样支持的综合分类研究。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Phycologia 生物-海洋与淡水生物学

CiteScore

3.10

自引率

18.80%

发文量

审稿时长

3 months

期刊介绍： Phycologia is published bimonthly by the International Phycological Society and serves as a publishing medium for information about any aspect of phycology. Membership in the Society is not necessary for publication. Submitted manuscripts cannot be previously published or submitted elsewhere. Copyright ownership of all accepted papers is held by the International Phycological Society.