Aptyxiella planata (Quenstedt, 1858)
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https://dx.doi.org/10.3897/zitteliana.96.e84187 |
publication LSID |
lsid:zoobank.org:pub:35B61908-6E65-48B0-9A17-7281C2253391 |
persistent identifier |
https://treatment.plazi.org/id/4FBA4CEC-F9B4-528B-A37A-45D861C4147E |
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Aptyxiella planata (Quenstedt, 1858) |
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Aptyxiella planata (Quenstedt, 1858)
Plate 1: figs 4-6 View Plate 1
*1858 - Nerinea planata - Quenstedt: p. 770, pl. 94, figs 31, 32.
v1881-1884 - Nerinea planata Qu. - Quenstedt: p. 554, pl. 207, figs 5-7, 8?
1901 - Aptyxiella planata Quenstedt - Geiger: p. 276.
1997 - Aptyxiella planata (Quenstedt) - Hägele: p. 133, fig. p. 133 upper right.
Material.
One specimen (SNSB-BSPG 2021 XV 1) and four questionable fragments from Nattheim ( Tübingen, Quenstedt collection).
Description.
The shell is high-spired and very slender. It is 70 mm high (apex missing). The whorls are high with a straight to slightly concave whorl face and slowly increasing in width. The suture is oblique and situated on a slightly elevated bulge formed by two adjoined whorls. No ornament is visible (due to preservation?). The base is flat and demarcated from whorl face by a sharp angulation, and lacks visible ornament. The aperture is elongated, higher than wide, rhomboid, and has a distinct, oblique siphonal canal (partially broken). Plaits are absent.
Remarks.
The four fragments from the Tübingen collection are poorly preserved and might represent different species. According to Geiger (1901, p. 277), the whorls are ornamented with numerous spiral cords of various strength which are, however, destroyed by the coarse silicification of the specimens from Nattheim (if they were present at all).
Aptyxis planata Quenstedt sensu Schlosser (1882) differs from the studied specimens by having spiral cords, a broader shape, lower whorls and more oblique sutures. According to Schlosser (1882, p. 77) "the only specimen housed in the Munich Museum" shows ornamentation. However, our study of the specimen could not confirm this. The very similar (identical?) Cossmannea? quenstedti Geiger, 1901 has a columellar plait.
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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