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Issue: Vol. 5550 No. 1: 10 Dec. 2024
Type: Article
Published: 2024-12-10
DOI: 10.11646/zootaxa.5550.1.29
Page range: 287-304
Abstract views: 216
PDF downloaded: 178

Redescription and validity of Formosania gilberti Oshima, 1919 (Cypriniformes: Balitoridae), an endemic hillstream loach from Taiwan

Taiwan Biodiversity Research Institute; 1 Min-Sheng E. Road; Jiji; Nantou 552005; Taiwan; R.O.C.
Institute of Marine Biology; National Taiwan Ocean University; Keelung; 202301; Taiwan; R.O.C.
National Museum of Marine Biology and Aquarium; 2 Houwan Rd.; Checheng; 94450; Taiwan; R.O.C.
National Museum of Marine Biology and Aquarium; 2 Houwan Rd.; Checheng; 94450; Taiwan; R.O.C.; Center of Excellence for the Oceans; National Taiwan Ocean University; Keelung; 202301; Taiwan; R.O.C.
Pisces Formosania Balitoridae taxonomy redescription Formosania gilberti

Abstract

For over a century, only one species of Formosania has been recognised in Taiwanese waters. However, through the use of mitogenomic analyses and the identification of morphological differences, an endemic balitorid loach was revalidated and redescribed based on specimens herein of northern Taiwan. Formosania gilberti Oshima, 1919 was previously mistreated as a junior synonym of F. lacustris (Steindachner, 1908), but the two can be clearly differentiated by their vertebral counts (26+11 vs. 26+12) and body marking patterns (intensely mottled with vermicular markings vs. cloud-like blotches or brown and blotchless). Furthermore, mitogenomic analyses also showed high intra-specific diversity among Formosania loaches in Taiwan, which not only supports F. gilberti as a valid species but also hints the presence of a species complex distributed in western Taiwan.

 

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