Ryukyupercis is a monotypic genus of marine ray‑finned fishes in the family Pinguipedidae, commonly known as sandperches. The sole recognized species in the genus is Ryukyupercis gushikeni, also referred to as the rosy grubfish.
Taxonomy
| Rank | Taxon |
|---|---|
| Kingdom | Animalia |
| Phylum | Chordata |
| Class | Actinopterygii |
| Order | Perciformes |
| Suborder | Uranoscopoidei |
| Family | Pinguipedidae |
| Genus | Ryukyupercis Imamura & Yoshino, 2007 |
| Species | Ryukyupercis gushikeni (Yoshino, 1975) |
The genus was erected by Hiroyuki Imamura and Toshio Yoshino in 2007 following phylogenetic analyses that indicated the species previously placed in Parapercis (as Parapercis gushikeni) formed a distinct lineage within Pinguipedidae【1†summary】. The type species is Ryukyupercis gushikeni.
Description
Ryukyupercis species are sandperches characterized by an elongated body, a dorsal fin with 9–10 spines, and a series of soft rays. R. gushikeni reaches a standard length of approximately 12 cm and displays a pinkish‑orange coloration with distinctive markings that give rise to its common name “rosy grubfish”【1†summary】. Detailed morphological characteristics are described in the original taxonomic paper (Imamura & Yoshino 2007) and in subsequent references such as FishBase.
Distribution and Habitat
Ryukyupercis gushikeni is distributed throughout the Indo‑Pacific region, ranging from the Ryukyu Islands of Japan southward to north‑western Australia. It inhabits marine coastal waters, typically over sandy or rubble substrates where it can lie partially buried while hunting small invertebrates and fish【1†summary】.
Etymology
The generic name combines “Ryukyu,” referring to the Ryukyu Islands where the type specimen was collected, with the suffix “‑percis,” a common element in many pinguipedid genera derived from the Greek word perke (meaning “perch”)【1†summary】. The specific epithet gushikeni honors the Japanese ichthyologist who first described the species under the genus Parapercis.
References
- Wikipedia contributors. “Ryukyupercis.” Wikipedia, The Free Encyclopedia. https://en.wikipedia.org/wiki/Ryukyupercis (accessed 22 April 2026).
- Imamura, H., & Yoshino, T. (2007). “Ryukyupercis, a new genus of pinguipedid fish for the species Parapercis gushikeni.” Ichthyological Research, 54(3), 93‑100.
- FishBase. “Ryukyupercis gushikeni.” https://www.fishbase.se/summary/SpeciesSummary.php?ID=8268 (accessed 22 April 2026).
- World Register of Marine Species (WoRMS). “Ryukyupercis Imamura & Yoshino, 2007.” https://www.marinespecies.org/aphia.php?p=taxdetails&id=282638 (accessed 22 April 2026).