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September 10, 2025

On a Collection of Rocky Intertidal Xanthid Crabs (Crustacea, Decapoda, Xanthidae) from Taiwan, with Description of a New Species of Cyclodius Dana 1851.

Key Points

Twenty-four species of xanthid crabs were recognized, including one new genus and a newly described species.
Five species are new records for Taiwan, and one species is entirely new to science, highlighting the region's biodiversity.
The study spans over 25 years of collecting specimens from rocky intertidal habitats in Taiwan and its islands.
This research contributes valuable knowledge about crustacean diversity and ecological niches in Taiwanese waters.

Abstract

Over 110 specimens of xanthid crabs collected from rocky intertidal habitats in Taiwan and its offshore islands over the past 25+ years were examined in the present study. As a result, 24 species were recognized, distributed across seven subfamilies and 16 genera including one new genus record (i.e., Lioxanthodes Calman, 1909) for Taiwan. Of these recognized species, 14 have been previously reported from Taiwan, whereas five are new records for Taiwan, one new to science, and four unnamed species. The five newly recorded species are Chlorodiella barbata (Borradaile, 1900), Etisus frontalis (Dana, 1852), Lioxanthodes alcocki Calman, 1909, and Macromedaeus quinquedentatus (Krauss, 1843), and Pilodius nigrocrinitus Stimpson, 1859. The new species, Cyclodius taiwanensis sp. nov., is herein described.

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