Gutingichthys changi, Lin & Wu & Lin & Chien, 2023

Gutingichthys changi sp. nov. Lin

Figure 13d–j View Fig

Holotype ASIZF 0100650 ( Fig. 13d View Fig ), Site 2, Chochen (Tainan), Taiwan. Early Pliocene.

Paratypes Six specimens: four specimens ASIZF 0100651 , 0100653 , 0100654 , 0100656 ( Fig. 13e, g–h, j View Fig ), Site 2, Chochen (Tainan), Taiwan ; two specimens ASIZF 0100652 , 0100655 ( Fig. 13f, i View Fig ), Site 5, sand layer, Tianliao (Kaohsiung), Taiwan. Early Pliocene .

Etymology Te name is derived from the name of Dr. Chih-Wei Chang (National Academy of Marine Research, Ocean Affairs Council, Kaohsiung, Taiwan), who has made significant contributions to the field of ichthyology, ocean science, and fish otolith studies in Taiwan. Te name is a tribute to Dr. Chang’s expertise and his role as a mentor to the author (CHL).

Diagnosis See diagnosis under the genus.

Description Te otoliths of this species exhibit an elongated to rectangular shape. In juveniles, the shape is more rounded and obtuse with an aspect ratio (OL/ OH) of approximately 1.8. However, in larger individuals, the otoliths become more elongated with OL/OH ranging from 2.3–2.7. Te posterior and anterior rims of the otoliths are variable, with some specimens bearing two angles, as seen in the holotype ( Fig. 13d View Fig 2 View Fig ), while others have nearly straight and almost vertical rims

( Fig. 13f View Fig 2, i2 View Fig ). Te ventral and dorsal rims are flat and straight, contributing to the overall rectangular shape. Te otoliths are characterized by their thickness. Te sulcus of these otoliths is oblong, centrally positioned. It is completely filled with a single, large colliculum, which is entirely surrounded by swelling and highly elevated cristae. Tis distinctive feature sets them apart from other species.

Remarks See remarks under the genus.

Occurrence Currently only known from the Lower Pliocene Gutingkeng Formation in Chochen (Tainan) and Tianliao (Kaohsiung), southwest Taiwan .