Hymenocephalus aff. papyraceus, Jordan & Gilbert, 1904
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publication ID |
https://doi.org/10.1186/s13358-023-00288-0 |
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persistent identifier |
https://treatment.plazi.org/id/0392F83E-B04E-FFC7-FC9A-1C6CFE93B2E3 |
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treatment provided by |
Felipe |
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scientific name |
Hymenocephalus aff. papyraceus |
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Hymenocephalus aff. papyraceus View in CoL Jordan & Gilbert, 1904
Figure 11h–i View Fig
1983 Hymenocephalus striatissimus —Ohe: pl. 13, Fig. 8 View Fig [ Japan].
Remarks Te twelve specimens of Hymenocephalus aff. papyraceus exhibit distinct features such as a salient antero-dorsal lobe, rounded ventral and posterior rims, well-separated but closely aligned collicula, and a well-delineated collicular crest located in the middle of the otolith and just above the crista inferior. Tese characteristics bear a strong resemblance to those of H. papyraceus ( Schwarzhans, 2014: Fig. 14I View Fig ), a species currently known only from the southeastern coast of Japan ( Nakayama, 2020; Schwarzhans, 2014). Te presence of these otoliths suggests a possible southward extension of the species during the Early Pliocene. However, we note that our specimens represent younger individuals and display a much shorter, less pointed posterior rim and a less oblique ventral area compared to the otolith depicted by Schwarzhans (2014: Fig. 14I View Fig ), which belongs to a larger individual. Extant otoliths of other species of Hymenocephalus found in Taiwan are presented in Fig. 10f–l View Fig for comparison.
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