Aethocrinus Temporal range:
| |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Echinodermata |
Class: | Crinoidea |
Family: | † Aethocrinidae |
Genus: | † Aethocrinus |
Aethocrinus is an early-diverging crinoid reported from the Early Ordovician. [1] Its five arms bifurcate.
The contested Echmatocrinus notwithstanding, it is a candidate for the earliest true member of the crinoid class – though not being a member of the crown group, quite where within the stem group to draw the distinction between eocrinoids and crinoids is a somewhat arbitrary decision.
Aethocrinus Temporal range:
| |
---|---|
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Echinodermata |
Class: | Crinoidea |
Family: | † Aethocrinidae |
Genus: | † Aethocrinus |
Aethocrinus is an early-diverging crinoid reported from the Early Ordovician. [1] Its five arms bifurcate.
The contested Echmatocrinus notwithstanding, it is a candidate for the earliest true member of the crinoid class – though not being a member of the crown group, quite where within the stem group to draw the distinction between eocrinoids and crinoids is a somewhat arbitrary decision.