Selenoides iowensis 1.jpg
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Selenoides iowensis
Ottosee Formation of Scott County, Virginia
Ordovician Age (485.4 -443.8 million years ago )
This is a receptaculitided genus endemic to North America. The fossil measures 3/4" across. Receptaculites is the name-bearing genus for an extinct group of conspicuous benthic marine genera, the Receptaculitidae, that lived from the Early Ordovician through the Permian period, peaking in the Middle Ordovician. The group's phylogenetic origin has long been obscure, but the current understanding is that the Receptaculitidae were calcareous algae, probably of the Order Dasycladales. Receptaculitids lived in warm, shallow seas and have been described from all continents except Antarctica In some areas they were important reef-formers, and they also occur as isolated specimens. Receptaculites and its relatives have a double-spiral, radiating pattern of rhombus-shaped plates supported by spindle-like objects called meroms. Fossils can usually be identified by the intersecting patterns of clockwise and counterclockwise rows of plates or stalk spaces, superficially similar to the arrangement of disk florets on a sunflower—hence the common name "sunflower coral" (sic).
Kingdom: Plantae
Phylum: Chlorophyta
Class: Ulvophyceae
Order: Dasycladales
Genus: Selenoides
Species: iowensis
Ottosee Formation of Scott County, Virginia
Ordovician Age (485.4 -443.8 million years ago )
This is a receptaculitided genus endemic to North America. The fossil measures 3/4" across. Receptaculites is the name-bearing genus for an extinct group of conspicuous benthic marine genera, the Receptaculitidae, that lived from the Early Ordovician through the Permian period, peaking in the Middle Ordovician. The group's phylogenetic origin has long been obscure, but the current understanding is that the Receptaculitidae were calcareous algae, probably of the Order Dasycladales. Receptaculitids lived in warm, shallow seas and have been described from all continents except Antarctica In some areas they were important reef-formers, and they also occur as isolated specimens. Receptaculites and its relatives have a double-spiral, radiating pattern of rhombus-shaped plates supported by spindle-like objects called meroms. Fossils can usually be identified by the intersecting patterns of clockwise and counterclockwise rows of plates or stalk spaces, superficially similar to the arrangement of disk florets on a sunflower—hence the common name "sunflower coral" (sic).
Kingdom: Plantae
Phylum: Chlorophyta
Class: Ulvophyceae
Order: Dasycladales
Genus: Selenoides
Species: iowensis
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Selenoides iowensis 1.jpg
By Dpaul7,
- ordovician age
- ottosee formation of scott county virginia
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