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Davidonia taconica
Taxonomy
Stenotheca taconica was named by Landing and Bartowski (1996). Its type specimen is NYSM 15529, a shell, and it is not a trace fossil. Its type locality is E-Bar-4.0 - Keeler's Eskimo Bar ice cream stand, which is in a Dyeran slope siltstone in the Browns Pond Formation of New York.
It was recombined as Aequiconus taconica by Parkhaev (2001); it was recombined as Mackinnonia taconica by Skovsted (2004) and Skovsted and Peel (2007); it was recombined as Mackinnonia taconia by Wotte (2006); it was recombined as Davidonia taconica by Claybourn et al. (2019), Peel (2021) and Wagner (2023).
It was recombined as Aequiconus taconica by Parkhaev (2001); it was recombined as Mackinnonia taconica by Skovsted (2004) and Skovsted and Peel (2007); it was recombined as Mackinnonia taconia by Wotte (2006); it was recombined as Davidonia taconica by Claybourn et al. (2019), Peel (2021) and Wagner (2023).
Sister species lacking formal opinion data
Synonymy list
| Year | Name and author |
|---|---|
| 1996 | Stenotheca taconica Landing and Bartowski pp. 753 - 754 figs. 5.5, 5.7-5.9, 10.2-10.3 |
| 2001 | Aequiconus taconica Parkhaev p. 138 |
| 2002 | Stenotheca taconica Landing et al. figs. f. 8.4 |
| 2004 | Mackinnonia taconica Skovsted pp. 16 - 18 figs. f. 3I-R,4A-C |
| 2006 | Mackinnonia taconia Wotte p. 151 |
| 2007 | Mackinnonia taconica Skovsted and Peel p. 734 fig. 4A |
| 2019 | Davidonia taconica Claybourn et al. p. 444 |
| 2021 | Davidonia taconica Peel p. 27 fig. 14.10–14.13 |
| 2023 | Davidonia taconica Wagner p. S5540 |
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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.
†Davidonia taconica Landing and Bartowski 1996
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Diagnosis
| Reference | Diagnosis | |
|---|---|---|
| E. Landing and K.E. Bartowski 1996 | Stenotheca species with small, rapidly expanding conch with broadly rounded, suberect apex; gently convex posterior margin; gently concave to straight or, rarely, weakly convex anterior margin below apex; broad, transverse rugae separated by deep, narrow furrows on steinkern; and laterally compressed, elliptical cross-section. | |
| C. B. Skovsted and J. S. Peel 2007 | Straight to slightly coiled and laterally compressed helcionelloid molluscs with smooth outer shell surface combined with prominent internal rugae, are assigned to the genus Mackinnonia Runnegar, 1990. Most specimens of Mackinnonia from the Forteau Formation of Newfoundland have a sub-centrally placed apex and represent Mackinnonia taconica (Landing and Bartowski, 1996), also known from the Browns Pond Formation of New York State (Landing and Bartowski 1996), the “Anse Maranda Formation” of Québec (Landing et al. 2002) and the Bastion Formation of North-East Greenland (Skovsted 2004). Internal moulds of a similar morphology were reported from the Forteau Formation of Labrador as Pollicina sp. (Spencer 1980). |