This category includes biological taxa of rank more inclusive than genus that evolved during the Ordovician period of geologic time, between 485.4 and 443.8 million years ago, as well as genera and species that evolved during this time and persisted across multiple geological periods.
Subcategories
This category has the following 6 subcategories, out of 6 total.
E
G
L
M
S
Pages in category "Ordovician first appearances"
The following 63 pages are in this category, out of 63 total. This list may not reflect recent changes.
C
L
S
This category includes biological taxa of rank more inclusive than genus that evolved during the Ordovician period of geologic time, between 485.4 and 443.8 million years ago, as well as genera and species that evolved during this time and persisted across multiple geological periods.
Subcategories
This category has the following 6 subcategories, out of 6 total.
E
G
L
M
S
Pages in category "Ordovician first appearances"
The following 63 pages are in this category, out of 63 total. This list may not reflect recent changes.