| Abrograptidae | |
|---|---|
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Animalia |
| Phylum: | Hemichordata |
| Class: | Pterobranchia |
| Order: | † Graptoloidea |
| Family: | † Abrograptidae Mu, 1958 |
Abrograptidae is an extinct family of graptolites from the Middle Ordovician. [1]
List of genera from Maletz (2014): [2]
Graptolites are a group of colonial animals, members of the subclass Graptolithina within the class Pterobranchia. These filter-feeding organisms are known chiefly from fossils found from the Middle Cambrian through the Lower Carboniferous (Mississippian). A possible early graptolite, Chaunograptus, is known from the Middle Cambrian. Recent analyses have favored the idea that the living pterobranch Rhabdopleura represents an extant graptolite which diverged from the rest of the group in the Cambrian.
Rhabdopleura is a genus of colonial sessile hemichordates belonging to the Pterobranchia class. As one of the oldest living genera with a fossil record dating back to the Middle Cambrian, it is also considered to be the only living genus of graptolites.
Monograptidae is an extinct family of graptolites of the order Graptoloidea. Monograptids have only one row of thecae per stipe, unlike the biserial graptolites which have two opposing rows of thecae per stipe.
Anisograptidae is an extinct family of graptolites. As the first planktic graptolites, they play a crucial role for understanding the transition of graptolites from ocean floor suspension feeders to ocean surface plankton during the early Ordovician.
Sigmagraptidae is an extinct family of graptolites.
Sinograptidae is an extinct family of graptolites.
Pterograptidae is an extinct family of graptolites.
Tetragraptidae is an extinct family of graptolites from the Floian to Darriwilian epochs of the Ordovician Period.
Isograptidae is an extinct family of graptolites.
Glossograptidae is an extinct family of graptolites.
Diplograptidae is an extinct family of graptolites.
Lasiograptidae is an extinct family of graptolites.
Climacograptidae is an extinct family of graptolites.
Dicranograptidae is an extinct family of graptolites.
Normalograptidae is an extinct family of graptolites.
Dendrograptidae is an extinct family of graptolites.
Acanthograptidae is an extinct family of graptolites.
Mastigograptidae is an extinct family of graptolites.
Cysticamaridae is an extinct family of graptolites.
Wimanicrustidae is an extinct family of graptolites.
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