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2025
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| Online-Zugang: | https://doi.org/10.5281/zenodo.14872298 |
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- <p><i>Cuneopsis celtiosimilis</i> Hou & Wu sp. nov.</p><p>Fig. 1 a; Suppl. material 2: fig. S 1</p><p><b>Type material.</b></p><p><i>Holotype</i> (Fig. 1 a) • SXNU_24100210 (length 119.1 mm, height 45.19 mm, width 32.74 mm); Luoshan County, Xinyang City, Henan Province, China. <i>Paratypes</i> (Suppl. material 2: fig. S 1 a, c, d) • three specimens, SXNU_24082201, SXNU_24100211, and SXNU_24100212. Same collection location as the holotype.</p><p><b>Morphological diagnosis.</b></p><p>Shell long, wedge-shaped; the umbo situated at 1 / 6 of the shell length; the epidermis black-red; nacre blue-white; and the two pseudocardinal teeth on the left valve join together and form in a continuous strip (Fig. 1); right valve has one low, squashed, and irregular pseudocardinal tooth. The labial palps long elliptical (Fig. 2 a 1); the papillae of the incurrent aperture short, pyramidal shape, and arranged in two rows (Fig. 2 a 2); and the papillae at the edge of the excurrent aperture not prominent and tightly arranged in a row (Fig. 2 a 3).</p><p><b>Molecular diagnosis.</b></p><p>The phylogenetic tree indicates that the new species forms a distinct lineage, and it is closely related to <i>Cuneopsis kiangsiensis</i> (Fig. 3). The genetic distance between the new species and its congeneric species shows that the smallest distance is observed with <i>Cuneopsis kiangsiensis</i> (4.6 %) (Table 2).</p><p><b>Description.</b></p><p>Shell thick, strong, both valves unequal. Shell long, wedge-shaped, slightly thickened, slightly inflated; anterior margin convex prominently; ventral margin arc-shaped; umbo located at 1 / 6 of the shell length; periostracum black-red; shell surface sculptured with fine concentric growth lines (Fig. 1; Table 1). Anterior adductor muscle attachment deep and rough; posterior adductor muscle attachment shallow and smooth; nacre blue-white; mantle muscle attachment obvious. Hinge well developed; left valve has two pseudocardinal teeth; anterior tooth small, and posterior tooth thick, both pseudocardinal teeth connect together and arranged in continuous strip; right valve has only one low, squashed, and irregular pseudocardinal tooth; left valve has two lateral teeth, and both arranged in a paralleled straight line; right valve has one lateral tooth (Fig. 1; Table 1). Papillae in the incurrent aperture short, pyramidal shape, arranged in two rows; papillae in the excurrent aperture weakly developed, tightly arranged in one row; and the pigmentation of the incurrent and excurrent aperture significant; labial palps medium-thick, long elliptical (Fig. 2; Table 1).</p><p><b>Etymology.</b></p><p>This newly discovered species exhibits morphological similarities with <i>Cuneopsis celtiformis</i>, which led us to incorporate this resemblance into its naming. Specifically, we used the word ‘ celti’ (derived from ‘ <i>celtiformis</i> ’) with the middle ‘ o’ connected to the Latinized word ‘ similis’ (similar) to name this new species. For the common name, we recommend “ Similar Wedged Mussel ” (English) and “ Jin Si Xie Bang ” (近似楔蚌) (Chinese).</p><p><b>Distribution.</b></p><p>Shi River, a tributary of Huai River, Luoshan County, Xinyang City, Henan Province, China.</p>