Synonyms: Acanthotrypella Vinassa de Regny, 1921Type Species: Atactopora septosa (Ulrich, 1879) see Boardman 1960 (Bryozoa.net)
History: (Nickles & Bassler, 1900)
- 1882 Amplexopora Ulrich, Jour. Cincinnati Soc. Nat. Hist., V, p. 154.
- 1883 Amplexopora Foord, Contr. Micro-Pal. Cambro.-Sil., p. 15.
- 1889 Amplexopora Miller, North American Geol. Pal., p. 291.
- 1890 Amplexopora Ulrich, Geol. Surv. Illinois, VIII, pp. 377, 450.
- 1896 Amplexopora Ulrich, Zittel’s Textb. Pal. (Engl. Ed.), p. 278.
- 1897 Amplexopora Simpson, Fourteenth Ann. Rep. State Geologist New York for the year 1894, p. 577.
Species found in the Cincinnatian (Bryozoa.net)
- Amplexopora ampla (Ulrich & Bassler, 1904)
- Amplexopora columbiana (Ulrich & Bassler, 1904)
- Amplexopora cylindracea (Ulrich & Bassler, 1904)
- Amplexopora discoidea (Nicholson, 1874)
- Amplexopora filiasa (d’Orbigny, 1850)
- Amplexopora parva (Utgaard & Perry, 1964)
- Amplexopora persimilis (Nickles, 1905)
- Amplexopora petasiformis (Nicholson, 1881)
- Amplexopora petasiformis welchi (James, 1882)
- Amplexopora pumila (Cummings & Galloway, 1913)
- Amplexopora pustulosa (Ulrich, 1890)
- Amplexopora robusta (Ulrich, 1882)
- Amplexopora septosa (Ulrich, 1879)
- Amplexopora variabilis (Ulrich, 1890)
Amplexopora is a genus of extinct stationary epifaunal filter feeders
Identification in Hand Sample:
- Zoarium Morphology: Ramose, frondose, discoidal, massive, or encrusting; 5-10mm diameter
- Zoecia: Prismatic, polygonal; Some species have zooecial linings
- Mesozooids: Few to none
- Monticules: None (Or very low)
- Maculae: Composed of larger zooecial apertures & some mesopores
Steven Holland (UGA Strat Lab, 2013):
- Thin section information: Styles abundant: Some located in zooecial corners and extend throughout endozone. Others are located along zooecial walls and extend only partly through endozone; these often inflect zooecial walls into irregular pelatoid shapes; Cystoidal diaphragms and cystiphragms common in many species
Hannah Brame pers. comm. (2013):
- A. septosa can be distinguished from A. robusta by its thicker cell walls, and the presence of mesopores
Treatise on Invertebrate Paleontology, Part G (1953):
- Ramose; Zooecia with complete diaphragms. Acanthopores numerous.
Nickles & Bassler (1900):
- Zoarium ramose, discoidal, or massy; zooecia prismatic, with diaphragms; acanthopores always present, variable in size and number
- Ramose, free or incrusting. Cellular structure as in Monotrypella, excepting that more or less numerous spiniform tubuli are developed, which sometimes completely encirlcle the tubes./li>