Information about Ascocerida

The Ordovician period is the second of the six (seven in North America) periods^[1] of the Paleozoic era, and covers the time roughly between 490 to 440 million years ago. It follows the Cambrian period and is followed by the Silurian period.
..... Click the link for more information.

The Silurian is a major division of the geologic timescale that extends from the end of the Ordovician period, about 443.7 ± 1.5 Ma (million years ago), to the beginning of the Devonian period, about 416.0 ± 2.8 Ma (ICS 2004).
..... Click the link for more information.

Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. Scientific classification also can be called scientific taxonomy, but should be distinguished from folk taxonomy, which lacks scientific basis.
..... Click the link for more information.

Editing of this page by unregistered or newly registered users is currently disabled until (UTC) due to vandalism.
If you are prevented from editing this page, and you wish to make a change, please discuss changes on the talk page, request unprotection, log in, or
..... Click the link for more information.

Mollusca
Linnaeus, 1758

Classes

Caudofoveata
Aplacophora
Polyplacophora
Monoplacophora
Bivalvia
Scaphopoda
Gastropoda
Cephalopoda
† Rostroconchia
† Helcionelloida
† ?Bellerophontida
The molluscs
..... Click the link for more information.

Cephalopoda
Cuvier, 1797

Orders

Subclass Nautiloidea

• †Plectronocerida
• †Ellesmerocerida
• †Actinocerida
• †Pseudorthocerida
• †Endocerida
• †Tarphycerida
• †Oncocerida

..... Click the link for more information.

Nautiloidea
Agassiz, 1847

Orders

Palcephalopoda

• †Plectronocerida
• †Ellesmerocerida
• †Actinocerida
• †Pseudorthocerida
• †Endocerida
• †Tarphycerida
• †Oncocerida

..... Click the link for more information.

Neocephalopoda
Lehmann & Hillmer, 1980

Subgroups

• Order Orthocerida  (in part)†
  
• Order Ascocerida†
  
• Order Bactritida†
  
• Subclass Ammonoidea†
  
• Subclass Coleoidea

..... Click the link for more information.

19th century - 20th century - 21st century
1910s  1920s  1930s  - 1940s -  1950s  1960s  1970s
1946 1947 1948 - 1949 - 1950 1951 1952

Year 1949 (MCMXLIX
..... Click the link for more information.

order (Latin: ordo, plural ordines) is a rank between class and family (termed a taxon at that rank). The superorder is a rank between class and order. Exact details of formal nomenclature depend on the Nomenclature Code which applies.
..... Click the link for more information.

Nautiloidea
Agassiz, 1847

Orders

Palcephalopoda

• †Plectronocerida
• †Ellesmerocerida
• †Actinocerida
• †Pseudorthocerida
• †Endocerida
• †Tarphycerida
• †Oncocerida

..... Click the link for more information.

Cephalopoda
Cuvier, 1797

Orders

Subclass Nautiloidea

• †Plectronocerida
• †Ellesmerocerida
• †Actinocerida
• †Pseudorthocerida
• †Endocerida
• †Tarphycerida
• †Oncocerida

..... Click the link for more information.