The Actinocerida are an order of generally straight, medium to large cephalopods that lived during the early and middle Paleozoic, distinguished by a siphuncle...
7 KB (836 words) - 17:43, 22 July 2024
†Actinocerida †Discosoritoidea = †Discosorida Three of these superorders were established for orders of uncertain placement: Endocerida, Actinocerida,...
37 KB (3,465 words) - 14:06, 14 June 2024
Ellesmerocerida (500 to 470 Ma) Order † Endocerida (485 to 430 Ma) Order † Actinocerida (480 to 312 Ma) Order † Discosorida (482 to 392 Ma) Order † Pseudorthocerida...
138 KB (15,375 words) - 21:28, 9 July 2024
Currently, Orthoceratoidea comprises the orders Riocerida, Dissidocerida, Actinocerida, Pseudorthocerida, Lituitida and Orthocerida. Orthocerida is a noteworthy...
6 KB (655 words) - 16:07, 12 August 2023
cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
52 KB (5,802 words) - 15:21, 14 August 2024
cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
5 KB (437 words) - 18:48, 12 January 2024
unlike orthoceratoid cephalopod orders such as the Orthocerida and Actinocerida. Endocerids reached enormous body sizes. The largest confirmed specimen...
13 KB (1,355 words) - 04:09, 15 July 2024
cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
3 KB (204 words) - 01:23, 29 December 2023
nautiloid cephalopod from the upper Ordovician, generally included in the Actinocerida. Nautiloids are a subclass of shelled cephalopods that were once diverse...
3 KB (297 words) - 04:41, 5 March 2021
cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
11 KB (914 words) - 20:37, 10 July 2023