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By DPS Ammonite
Sponge
Kingdom: Animalia
Eon: Phanerozoic
Era: Paleozoic
Period: Carboniferous
Sub Period: Pennsylvanian
Epoch: Middle
International Age: Moscovian
Naco Formation
Collector: Me
Date Collected: 09/28/2020
Acquired by: Field Collection
Width: 40 mm
Thickness: 25 mm
Roberts Mesa
Gila County
Arizona
United States
Stioderma coscinum
from Rigby and Mapes 2000.
Sponges are common in the Pennsylvanian Naco Formation of central Arizona. A friend and I collected pieces of Stioderma sponges near Roberts Mesa. Stioderma sponges have a set of very distinctive features that make an ID much easier than other Arizona sponges. They have spicules that are distally modified into layered rounded pustules that are set atop a surface with funnel shaped holes. My sponge has an edge that curves under and is covered with pustules. Further research might reveal what species they are.
Stioderma genus erected by Finks:
Finks, Robert M. (1960). Late Paleozoic sponge faunas of the Texas region: The siliceous sponges. Bulletin of the American Museum of Natural History 120(1):1-160 found at
http://digitallibrary.amnh.org/handle/2246/1220
Stioderma coscinum found in Desmoinian Age Millsap Lake Formation in Texas:
Rigby, J. K. and Mapes, R. H. 2000. Some Pennsylvanian and Permian sponges from southwestern Oklahoma and north-central Texas. Brigham Young University Geology Studies, v. 45, p. 25–67.
http://geology.byu.edu/Home/sites/default/files/geo_stud_vol_45_rigby_mapes.pdf
Spanish Stioderma:
Diego C. García-Bellido, & Rigby, J. (2004). Devonian and Carboniferous Sponges from Spain. Journal of Paleontology, 78(3), 431-455. Retrieved September 30, 2020, from http://www.jstor.org/stable/4094858
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