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Valvata pseudoadeorbis
Taxonomy
Valvata pseudoadeorbis was named by Sinzov (1880) [DISTRIBUTION: Middle Miocene; Paratethys.]. It is not a trace fossil.
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1880 | Valvata pseudoadeorbis Sinzov p. 9 |
| 2002 | Valvata pseudoadeorbis Harzhauser and Kowalke p. 74 |
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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.
†Valvata pseudoadeorbis Sinzov 1880
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| M. Harzhauser and T. Kowalke 2002 | The small low-conical, stepped shell comprises 2-3 strongly convex whorls. It measures up to 1 mm in width and up to 0.6 mm in height. The teleoconch is characterised by whorls with impressed sutures and with a smooth surface except for growth lines. Aperture with subcircular outline, characterised by a thin peristome. Very broad, circular and deep umbilicus. The protoconch consists of 1.25-1.3 flatly coiled whorls measuring 0.07 mm in the width of the initial cap and 0.29-0.3 mm in maximum diameter. The heterostrophic character of the protoconch is indicated by the slightly sunken initial cap. The initial cap is ornamented by a distinct groove-ridge pattern. The following shell is sculptured by dense spiral striae. The last quarter whorl of the protoconch is characterised by a slightly irregularly folded surface. The embryonic shell is terminated by a thickened rim. The onset of the teleoconch is indicated by the formation of dense growth lines and the cessation of the spiral pattern. |
Measurements
No measurements are available
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| Source: f = family, c = class | |||||
| References: Bush and Bambach 2015, Kiessling 2004 | |||||