Scientific Classification
| Kingdom: Animalia |
| Phylum: Brachiopoda |
| Class: Strophomenata |
| Order: Productida |
| Family: Araksalosiidae |
| Genus: Truncalosia |
| Species: Truncalosia truncata (Hall, 1843) |
Information
Geological Range
Paleogeographic Distribution
Stratigraphic Occurrences
References
Hall (1867) (as Productella truncata): p. 160, pl. 23.
AMNH digital repository of Imbries 1959 publication in which he named the genus Truncalosia and placed Halls Productus truncata within it, as well as distinguishing it from other productids with which it cooccurs.
Linsley (1994): p. 183, figs. 1-15.
Wilson (2014): pp. 102, 103.
Remarks
Originally described as Strophomena pustulosa by Hall in 1843. Recombined as Productus truncatus by Hall in 1857. Recombined as Productella truncata by Hall in 1867. Recombined as Truncalosia truncata by Imbrie in 1959.
From Wilson (2014, p. 103): “Small shell. Pedicle valve strongly convex, flattened at the beak, with multiple spines, generally preserved only as bases. To 10-15 mm.”
From Carlton Brett and Gordon Baird: “This tiny productid forms part of recurring assemblages of diminutive brachiopods in dark gray to black shale, especially Crurispina nana and in some cases small Tropidoleptus and tiny Allanella. These assemblages occur sporadically from the late Eifelian (Union Springs) through the Moscow Formation. They provide very good stratigraphic markers, e.g. the Truncalosia truncata Bed at the base of the Wanakah Shale, which can be traced for nearly 200 miles and transcends facies from calcareous mudstone to black shale to dark siltstone. They seem to be an analog of small chonetid biofacies but chonetids are usually rare in these assemblages. At present it is not clear what the source area of these assemblages is and what parameters control their abrupt entry and disappearance in the Appalachian Basin.”
Online Resources
Paleobiology Database (Genus-level page).
Paleobiology Database (as Productus (Productella) truncata).
Media
Images
