Scientific Classification
| Kingdom: Animalia |
| Phylum: Brachiopoda |
| Class: Rhynchonellata |
| Order: Spiriferida |
| Family: Adolfidae |
| Genus: Allanella |
| Species: Allanella tullius (Hall, 1867) |
Information
Geological Range
Paleogeographic Distribution
Stratigraphic Occurrences
References
Hall, J., 1867 (as Spirifer tullia): pg. 218-219, pl. 35
Linsley, D., 1994: p. 211, figs 10-17.
Wilson, K., 2014: p. 116-117.
Remarks
From Wilson (2014, p. 116-117): “Small shell; strongly convex pedicle valve with well-defined sinus extending to the beak. Cardinal area relatively large for its size. Surface with low, flattened plications. To 15-20mm.”
Originally described as Spirifera tullia by James Hall in 1867. Recombined as Spirifer tullius by Prosser and Kindle in 1913. Recombined as Allanella tullius by Bonelli, Jr. et al. in 2006.
From Carl Brett: Brett et al. (1991; 2007) recognized two different in formal groups of Allanella that occur in very different facies: large Allanella occurs in shallow shoreface silts and sands often in monospecific high density shell beds through the Hamilton Group from Oatka Creek to Moscow Fm. and in the Gilboa Formation, theeastern equivalent of the Tully Formation. It is thus interpreted as nearshore generalist in proximal, storm-influenced silts and sands. In contrast, small Allanella, which rarely exceed 0.5 cm occur in dark shales reflecting offshore dysoxic settings particularly in the Moscow Formation often in association with Emanuella praeumbona (e.g., Fisher Gully Submember of Windom Shale and Garrattsville Member). It remains uncertain whether these two morphs should really be considered to be a single species.
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