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Walnichollsia
Taxonomy
Walnichollsia is a genus. It is not extant.
It was assigned to Pleurotomariidae by Fletcher (1958); to Archaeogastropoda by Sepkoski (2002); and to Glabrocingulides by Wagner (2023).
It was assigned to Pleurotomariidae by Fletcher (1958); to Archaeogastropoda by Sepkoski (2002); and to Glabrocingulides by Wagner (2023).
Species
Synonymy list
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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. †Walnichollsia
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†Walnichollsia erecta Waterhouse 1986
†Walnichollsia minuta Waterhouse 1963
†Walnichollsia subcancellata Morris 1845
Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| H.O. Fletcher 1958 | Large subturbinate, thin-shelled, widely phaneromphalous gastropods of five whorls; body whorl extended somewhat transversely; whorl profile rounded at the periphery, gently arched above and below; no apparent sinus on the outer lip (not actually observed); an ill-defined, shallow selenizone is developed lying between two faint carinae barely distinguishable from the spiral costae, and developed on the periphery; aperture elongate-oval, obliquely transverse; ornamentation strong spiral costae crossed by finer transverse lirae, forming a definite lattice structure. |
Measurements
| part | N | mean | minimum | maximum | median | s.d. | |
|---|---|---|---|---|---|---|---|
| shell height | 4 | 14.1 | 7.00 | 26.0 | 16.2 | 9.52 | |
| shell diameter | 4 | 16.3 | 11.0 | 29.5 | 15.2 | 8.65 |
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| Source: f = family, o = order | |||||
| References: Hendy 2009, Bambach et al. 2007 | |||||
Age range: base of the Artinskian to the top of the Wuchiapingian or 290.10000 to 254.14000 Ma
Collections (8 total)
| Time interval | Ma | Country or state | Original ID and collection number |
|---|---|---|---|
| Artinskian | New Zealand | W. minuta (52769) | |
| Roadian | Australia (Tasmania) | W. sp. (105423) | |
| Wordian | New Zealand (Nelson) | W. sp. (41797) | |
| Wordian | Australia (New South Wales) | Pleurotomaria subcancellata (133347 134048) | |
| Capitanian | New Zealand (Southland) | W. subcancellata (41777 41778) | |
| Wuchiapingian | Australia (Queensland) | W. subcancellata (120350) |