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Parvulactaeon
Taxonomy
Parvulactaeon was named by Gründel (1997).
It was assigned to Cylindrobullinoidea by Gründel (1997); and to Bullinidae by Mitta et al. (2004), Gründel and Nützel (2012), Schulbert and Nützel (2013).
It was assigned to Cylindrobullinoidea by Gründel (1997); and to Bullinidae by Mitta et al. (2004), Gründel and Nützel (2012), Schulbert and Nützel (2013).
Species
Species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1997 | Parvulactaeon Gründel p. 190 figs. pl. 5, figs. 13-15; pl. 6, fig. 1 |
| 2004 | Parvulactaeon Mitta et al. p. 30 |
| 2012 | Parvulactaeon Gründel and Nützel p. 48 |
| 2013 | Parvulactaeon Schulbert and Nützel p. 768 |
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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.
G. †Parvulactaeon Gründel 1997
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†Parvulactaeon imprimum Schulbert et al. 2013
†Parvulactaeon inclinatum Schulbert et al. 2013
†Parvulactaeon spiralocostata Grundel 1997
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| J. Gründel and A. Nützel 2012 | The shell is broad, oval, small and comprises only up to two teleoconch whorls. The protoconch is coaxial to medioaxial; it consists of up to 1.5 smooth rounded, rapidly increasing whorls. The teleoconch whorls are convex, mostly with subsutural ramp which is demarcated by a pronounced spiral furrow. Whorls and base are covered with numerous spiral grooves of about equal strength, separated by mostly broader interspaces. The growth lines are prosocyrt between centre of base and ramp. They are somewhat opisthocyrt on the ramp. The aperture is elongated, oval with an evenly convex outer lip. |
Measurements
No measurements are available
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| Source: superf = superfamily, c = class | |||||
| References: Hendy et al. 2009, Kiessling 2004 | |||||
Age range: base of the Early/Lower Aalenian to the top of the Middle Callovian or 174.70000 to 161.50000 Ma
Collections (12 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Aalenian | Germany | P. sulcata (58236) | |
| Early/Lower Aalenian | Germany | P. sp. (75981) P. sp. 2, P. spiralocostata (75982) P. spiralocostata (58216 58217) P. torulosi (58338) | |
| Late/Upper Aalenian | Germany | P. sulcata (58341) | |
| Bajocian - Bathonian | Poland | P. latestriata (58290) | |
| Late/Upper Bajocian - Early/Lower Bathonian | Germany | P. latestriata (58325) | |
| Early/Lower Bathonian | Russian Federation | P. sokurensis (68348 68349) | |
| Early/Lower Callovian - Middle Callovian | Poland | P. sp. (58262) |