Braulioceras
Encyclopedia
Braulioceras is a smooth, orthoconic orthocerid with very close spaced septa (ca 8 over a length equal to the diameter of the shell) added to the Sactorthoceratidae
in 2007. The type species, Braulioceras sanjuanense comes from the Middle Ordovician of the San Juan Formation, Argentine Precordillera, in Argentina.
Braulioceras is very similar to Sactorthoceras
, differing in small detail. The siphuncle is central, with orthochaonitic septal necks and segments are slightly expanded between septa that give it a beaded appearance. The thickness of the connecting rings is similar to that in ellesmerocerids. Endosiphuncular or cameral depostis are unknown.
Braulioceras is distinguished from Sactorthoceras by its more closely central siphuncle, and expanded segments with out the contractions at the ends as in the type species of Sactorthoceras, S. gonioseptatum.
Sactorthoceratidae
The Sactorthoceratidae comprise Orthocerataceaen genera with a subcentral suborthochoanitic siphuncle composed of slightly expanded segments and free of organic depsits...
in 2007. The type species, Braulioceras sanjuanense comes from the Middle Ordovician of the San Juan Formation, Argentine Precordillera, in Argentina.
Braulioceras is very similar to Sactorthoceras
Sactorthoceras
Sactorthceras is an orthoceratoid genus known from the Middle Ordovician of eastern North America , Norway and Korea and is the type genus of the Sactorthoceratidae....
, differing in small detail. The siphuncle is central, with orthochaonitic septal necks and segments are slightly expanded between septa that give it a beaded appearance. The thickness of the connecting rings is similar to that in ellesmerocerids. Endosiphuncular or cameral depostis are unknown.
Braulioceras is distinguished from Sactorthoceras by its more closely central siphuncle, and expanded segments with out the contractions at the ends as in the type species of Sactorthoceras, S. gonioseptatum.
References
- Paleobiology-db Braulioceras
- B. Kröger, et al. 2007. Early orthoceratoid cephalopods from the Argentine Precordillera (Lower-Middle Ordovician). Journal of Paleontology 81(6):1266-1283 http://findarticles.com/p/articles/mi_qa3790/is_200711/ai_n21137444/pg_10
- Rousseau Flower, 1962. Notes on the Michelinoceratida. Memoir 10, Part II, p.30. New Mexico Bureau of Mines and Mineral Resources.