Geothelphusa laowang, A New Species of Montane Freshwater Crab (Crustacea: Brachyura: Potamidae) from Southern Taiwan

Geothelphusa laowang n. sp., is a new freshwater crab described from the montane area of the Central Range in southern Taiwan based on the evidence from the morphological characters and mitochondrial cytochrome oxidase subunit I. This species is distinguished from similar congeners by the morphology of the male first gonopod and the proportions of the male thoracic sternites. Molecular evidence also supported the status of the new species. Moreever, molecular phylogenetic analysis suggested that ten species may be present in the Central Range clade and with six of them still undescribed. The high species diversity of freshwater crabs in montane area may resulted from the low gene flow impeded by the high mountain barriers.

關鍵字

Potamidae ； freshwater crab ； new species ； Geothelphusa laowang ； G. haituan ； Taiwan ； mitochondrial COI ； montane area

並列摘要

基於形態特徵和粒線體COI證據，本文描述一產於南臺灣中央山脈山區的新種淡水蟹－老王澤蟹（Geothelphusa laowang）。利用雄性第一生殖肢形態和胸部腹甲比例，本種可與同屬其他種類加以區分，同時分子證據也支持其為新種。基於分子親緣關係，一個廣泛分布於中央山脈的單系群包含了10種，並有六個未描述的物種。山區淡水蟹的高物種多樣性，可能是由於高山屏障阻礙導致低基因交流的結果。

並列關鍵字

溪蟹科；淡水蟹；新種；老王澤蟹；海端澤蟹；臺灣；粒線體COI ；山區

參考文獻

Ng, P. K. L., Shih, H.-T., Ho, P.-H. & Wang, C.-H., 2017. An updated annotated checklist of brachyuran crabs from Taiwan (Crustacea: Decapoda). Journal of the National Taiwan Museum 70(3/4): 1–208. doi:10.6532/JNTM.201712_70(3;4).01.

Prema, M., Hsu, J.-W., Shih, H.-T. & Ravichandran, S., 2022. First record of the genus Pseudohelice Sakai, Türkay & Yang, 2006 from India and description of a new pseudocryptic species (Crustacea: Brachyura: Varunidae). Zoological Studies 61: 56. doi:10.6620/ZS.2022.61-56.

Raj, S., Kumar, A. B. & Ng, P. K. L., 2022. New genus and two new species of semiterrestrial crabs (Decapoda: Brachyura: Gecarcinucidae) from the southern Western Ghats, India. Zoological Studies 61: 49. doi:10.6620/ZS.2022.61-49.

Shih, H.-T., Hsu, J.-W., Chang, K. & Chen, M.-W. 2023. Taxonomy and phylogeography of the freshwater crab Geothelphusa tawu species complex (Crustacea: Decapoda: Potamidae) from southern Taiwan and offshore islets. Zoological Studies 62: 37. doi:10.6620/ZS.2023.62-37.

Shih, H.-T., Prema, M., Kumar, A. A. J., Saher, N. U., Ravichandran, S., Odhano, S. & Paulay, G., 2022. Diversity and distribution of fiddler crabs (Crustacea: Brachyura: Ocypodidae) around the Arabian Sea. Zoological Studies 61: 65. doi:10.6620/ZS.2022.61-65.

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