The Actinocerida are an order of generally straight, medium to large cephalopods that lived during the early and middle Paleozoic, distinguished by a siphuncle...
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†Actinocerida †Discosoritoidea = †Discosorida Three of these superorders were established for orders of uncertain placement: Endocerida, Actinocerida,...
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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...
139 KB (15,558 words) - 10:20, 4 January 2025
cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
52 KB (5,802 words) - 00:57, 23 December 2024
cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
5 KB (437 words) - 01:31, 30 October 2024
(2016-04-02). "Siphuncular structures in Calciosiphonate nautiloid orders Actinocerida, Orthocerida and Barrandeocerida (Cephalopoda)". GFF. 138 (2): 295–305...
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cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
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unlike orthoceratoid cephalopod orders such as the Orthocerida and Actinocerida. Endocerids reached enormous body sizes. The largest confirmed specimen...
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Currently, Orthoceratoidea comprises the orders Riocerida, Dissidocerida, Actinocerida, Pseudorthocerida, Lituitida and Orthocerida. Orthocerida is a noteworthy...
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cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
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nautiloid cephalopod from the upper Ordovician, generally included in the Actinocerida. Nautiloids are a subclass of shelled cephalopods that were once diverse...
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cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
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groups, with its siphuncle placement more closely resembling that of the Actinocerida and especially the Orthocerida, which were recovered as its potential...
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cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
11 KB (914 words) - 19:43, 18 November 2024
makes them also separate from the groups that include the Discosorida, Actinocerida, Endocerida, and Orthocerida, and from the superficially similar Ammonoidea...
6 KB (661 words) - 15:12, 13 October 2023
cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
3 KB (319 words) - 01:15, 1 October 2023
cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
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cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
7 KB (794 words) - 15:47, 4 January 2025
cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
10 KB (1,127 words) - 19:27, 26 November 2024
cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
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and could inhabit depths greater than 100–200 m. The wide-siphuncled Actinocerida and the Discocerida both emerged during the Darriwilian. The direction...
37 KB (4,187 words) - 18:48, 9 November 2024
From the Katian of Sweden. Estimated after maximum diameter (165 mm). Actinocerida gen. et sp. indet. 1.911 m (estimate) Klug et al. (2015:270) From the...
359 KB (29,840 words) - 23:04, 20 December 2024
cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
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Ordovician (Katian) Králův Dvůr Formation Czech Republic A member of Actinocerida belonging to the family Ormoceratidae. Antaganides Gen. et 3 sp. et comb...
163 KB (8,590 words) - 16:45, 2 January 2025
Actinoceras (category Actinocerida)
principal and root genus of the Actinoceratidae, a major family in the Actinocerida, that lived during the Middle and Late Ordovician. It is an extinct genus...
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Pseudorthocerids and actinocerids (respectively Pseuorthocerida and Actinocerida) are extinct nautiloid cephalopods, generally with long straight shells...
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cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
2 KB (154 words) - 14:52, 21 May 2024
cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
7 KB (713 words) - 06:26, 18 November 2024
cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida, Oncocerida Earliest coiled cephalopods: Tarphycerida...
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Kingdom: Animalia Phylum: Mollusca Class: Cephalopoda Subclass: Nautiloidea Order: †Actinocerida Family: †Actinoceratidae Saemann (1853) Genera See text...
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