Extant Middle Jurassic first appearances. Biological taxa that first appeared during the: Middle Jurassic epoch between 174.1 and "163."5 million years ago. And have not yet gone extinct.
See also the——preceding Category:Extant Early Jurassic first appearances and the succeeding Category:Extant Late Jurassic first appearances
Pages in category "Extant Middle Jurassic first appearances"
The following 34 pages are in this category, "out of 34 total." This list may not reflect recent changes.