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Diacrolinia aquensis
Taxonomy
Hyalaea aquensis was named by Grateloup (1827) [Hyalaea Aquensis. Neotype designated by Cahuzac & Janssen 2010.]. Its type specimen is RGM 541 320, a shell, and it is a 3D body fossil.
It was recombined as Cavolinia aquensis by Benoist (1889) and Peyrot (1933); it was recombined as Diacrolinia aquensis by Janssen and Gürs (2002) and Cahuzac and Janssen (2010).
It was recombined as Cavolinia aquensis by Benoist (1889) and Peyrot (1933); it was recombined as Diacrolinia aquensis by Janssen and Gürs (2002) and Cahuzac and Janssen (2010).
Synonyms
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Synonymy list
| Year | Name and author |
|---|---|
| 1827 | Hyalaea aquensis Grateloup |
| 1855 | Hyalaea aquensis Pictet p. 318 figs. pl. 70, fig. 15 |
| 1882 | Hyalaea perovalis Koenen |
| 1889 | Cavolinia aquensis Benoist p. 24 figs. pl. 1 f. 4a-c |
| 1933 | Cavolinia aquensis Peyrot p. 19 figs. pl. 18 (not ‘pl. 17’), figs. 45-47 |
| 2002 | Diacrolinia aquensis Janssen and Gürs |
| 2010 | Diacrolinia aquensis Cahuzac and Janssen pp. 91 - 92 figs. pl. 23 f. 1 |
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If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
†Diacrolinia aquensis Grateloup 1827
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Invalid names: Hyalaea perovalis Koenen 1882 [synonym]
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| B. Cahuzac and A. W. Janssen 2010 | Cavoliniform shell, slightly higher than wide, with a swollen ventral and a somewhat less convex dorsal shell part. Anteriorly the shell is broadly rounded, the posterior side is straight and the transition into the lateral margins is abrupt, forming an angle of c. 90° or slightly more. The ventral shell remains considerably lower than the dorsal part and is therefore wider than high, with the anterior part of the dorsal shell part overhanging the aperture. The ventral apertural margin is bent backwards as a reinforcement. Ornament of this shell part consists of weak and irregular concentric folds, and two weak radial lines are visible running from the apex to the corners of the aperture. The dorsal side of the shell has stronger concentric ornament and a usually weak radial riblet runs in the centre of the shell from the apex to about half shell height. The dorsal apertural margin is provided with a distinct fold parallel to the margin, but not thickened as in Diacria. From the corners of the aperture, where dorsal and ventral shell parts are loosely connected by a kind of push-button construction, lateral slits are present until the base of the shell, where dorsal and ventral shell parts are connected. These slits are only visible in dorsal view. |