The Ellesmerocerida is an order of primitive cephalopods belonging to the subclass Nautiloidea with a widespread distribution that lived during the Late...
8 KB (890 words) - 16:20, 14 January 2024
Evolution of cephalopods (section Ellesmerocerida)
been borne out. The earliest true cephalopod order to emerge was the Ellesmerocerida, which were quite small; their shells were slightly curved, and the...
37 KB (4,187 words) - 23:38, 1 July 2024
Plectronocerida: the ancestral cephalopods from the Cambrian Period Order † Ellesmerocerida (500 to 470 Ma) Order † Endocerida (485 to 430 Ma) Order † Actinocerida...
138 KB (15,375 words) - 00:59, 13 September 2024
paraphyletic Cambro-Ordovician Ellesmerocerida. A few older studies consider Plectronocerida to be descended from Ellesmerocerida (rather than ancestral), but...
5 KB (473 words) - 19:11, 3 December 2023
†Plectronoceratoidea = †Plectronocerida, †Protactinocerida, †Yanhecerida, and †Ellesmerocerida. †Endoceratoidea = †Endocerida †Orthoceratoidea = †Orthocerida, †Ascocerida...
37 KB (3,465 words) - 14:06, 14 June 2024
widely spaced, resulting in large, long camarae. In others such as the Ellesmerocerida, Oncocerida and Discosorida the septa are crowded closely together...
3 KB (373 words) - 10:36, 23 June 2024
Aulacocerids Phragmoteuthids Early forms the earliest cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida...
52 KB (5,802 words) - 08:19, 25 September 2024
originally defined in 2013, Multiceratoidea included four nautiloid orders: Ellesmerocerida, Oncocerida, Discosorida, and Ascocerida. The order Tarphycerida was...
6 KB (564 words) - 01:08, 24 November 2023
middle Trempealeauan) to the other three plectronoceratoid orders, the Ellesmerocerida and Protactinocerida and Yanhecerida. The Plectronoceratidae gave rise...
4 KB (424 words) - 09:36, 14 February 2023
cephalopods. They were similar to the more diverse Plectronocerida and Ellesmerocerida, with short shells, closely spaced septa, and diaphragms (partitions)...
3 KB (264 words) - 02:24, 27 November 2023
Aulacocerids Phragmoteuthids Early forms the earliest cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida...
5 KB (437 words) - 18:48, 12 January 2024
Cyclostomiceratidae (category Ellesmerocerida)
non-existent and connecting rings are thick and layered. As typical of the Ellesmerocerida, chambers are short, septa close spaced. Five genera are recognized;...
2 KB (179 words) - 20:35, 21 April 2024
Geology Vol 11, pp647–650, Nov 1983 Flower R.H.1964, The Nautiloid Order Ellesmerocerida (Cephalopoda) Menoir 12, New Mexico Bureau of Mines and Mineral Resources...
5 KB (275 words) - 10:13, 30 September 2023
Aulacocerids Phragmoteuthids Early forms the earliest cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida...
581 bytes (24 words) - 11:53, 4 July 2024
Paldoceras (Kröger et al 2009). Apocrinoceratidae was removed from the Ellesmerocerida to the Discosorida by Kröger et al (2009) based in the inclusion of...
2 KB (226 words) - 17:10, 3 August 2024
Aulacocerids Phragmoteuthids Early forms the earliest cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida...
3 KB (213 words) - 10:37, 20 March 2024
Levisoceras (category Ellesmerocerida)
swum above, the sea floor. Flower, R.H. 1964. The Nasutiloid Order Ellesmerocerida (Cephalopoda); Memoir 12, New Mexico Bureau of Mines and Mineral Resources...
2 KB (179 words) - 03:03, 22 July 2024
Aulacocerids Phragmoteuthids Early forms the earliest cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida...
3 KB (204 words) - 01:23, 29 December 2023
Flower and Kummel (1950) for forms intermediary between the ancestral Ellesmerocerida and the more advanced Tarphycerida and Oncocerida. The order, as originally...
4 KB (455 words) - 08:17, 25 January 2024
Geology Vol 11, pp647–650, Nov 1983 Flower R.H.1964, The Nautiloid Order Ellesmerocerida (Cephalopoda) Menoir 12, New Mexico Bureau of Mines and Mineral Resources...
3 KB (164 words) - 19:45, 10 August 2021
Aulacocerids Phragmoteuthids Early forms the earliest cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida...
7 KB (793 words) - 15:25, 21 June 2024
present in some members of the earlier cephalopod orders Yanhecerida and Ellesmerocerida. Unlike true endocerids, the simple endocones of bisonocerids are interlaced...
5 KB (525 words) - 09:08, 3 December 2023
Plicatuloidea Superfamily Pterioidea Order Plectronocerida † Order Ellesmerocerida † Order Actinocerida † Order Pseudorthocerida † Order Ascocerida †...
8 KB (465 words) - 17:19, 30 July 2024
assigned it to the Baltoceratidae which at that time was included in the Ellesmerocerida. The Baltoceratidae, along with included genera, has since been moved...
2 KB (195 words) - 22:15, 27 December 2022
from the Plectronoceratida rather than through the more developed Ellesmerocerida, as did the other orders. Finally and most diagnostic, discosorids...
5 KB (642 words) - 22:27, 5 November 2023
Clarkoceras (category Ellesmerocerida)
newton-winchelli. Ruedemann in 1905 recognized this as belonging to the Ellesmerocerida and renamed it Clarkoceras newton-winchelli (Clarke), which became...
3 KB (360 words) - 01:45, 12 June 2024
Orthocerids likely arose from the Baltoceratidae, a family of the Ellesmerocerida. However, the phylogeny of Orthocerida is heavily debated as it lacks...
10 KB (1,019 words) - 11:12, 24 December 2023
Aulacocerids Phragmoteuthids Early forms the earliest cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida...
13 KB (1,355 words) - 04:09, 15 July 2024
Bambusoceras (category Ellesmerocerida)
Bambusoceras is a genus of Late/Upper Cambrian nautiloids, member of the Ellesmerocerida and probably Ellesmeroceratidae according to Jack Sepkoski's list of...
829 bytes (36 words) - 01:19, 11 October 2021
Aulacocerids Phragmoteuthids Early forms the earliest cephalopod group Ellesmerocerida Orthocones: Endocerida, Orthocerida, Actinocerida Brevicones: Ascocerida...
7 KB (741 words) - 19:28, 1 March 2024