Microconchida
The order Microconchida is a group of small, spirally-coiled, encrusting fossil "worm" tubes found from the Upper Ordovician to the Middle Jurassic (Bathonian) around the world. They have lamellar calcitic shells, usually with pseudopunctae or punctae and a bulb-like origin. Many were long misidentified as the polychaete annelid Spirorbis until studies of shell microstructure and formation showed significant differences. All pre-Cretaceous "Spirorbis" fossils are now known to be microconchids. Their classification at the phylum level is still debated. Most likely they are some form of lophophorate, a group which includes phoronids, bryozoans and brachiopods. Microconchids may be closely related to the other encrusting tentaculitoid tubeworms, such as Anticalyptraea, trypanoporids and cornu
order (taxonomy)
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Microconchida
The order Microconchida is a group of small, spirally-coiled, encrusting fossil "worm" tubes found from the Upper Ordovician to the Middle Jurassic (Bathonian) around the world. They have lamellar calcitic shells, usually with pseudopunctae or punctae and a bulb-like origin. Many were long misidentified as the polychaete annelid Spirorbis until studies of shell microstructure and formation showed significant differences. All pre-Cretaceous "Spirorbis" fossils are now known to be microconchids. Their classification at the phylum level is still debated. Most likely they are some form of lophophorate, a group which includes phoronids, bryozoans and brachiopods. Microconchids may be closely related to the other encrusting tentaculitoid tubeworms, such as Anticalyptraea, trypanoporids and cornu
has abstract
The order Microconchida is a g ...... trypanoporids and cornulitids.
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Wikipage page ID
27,911,082
Wikipage revision ID
717,385,989
authority
fossil range
Upper Ordovician - Middle Jurassic
image caption
Palaeoconchus angulatus on a brachiopod from the Middle Devonian of Michigan
parent authority
subdivision
*Microconchus
*Palaeoconchus
*Annuliconchus
*Punctaconchus
*Polonoconchus
*Helicoconchus
subdivision ranks
subject
hypernym
type
comment
The order Microconchida is a g ...... traea, trypanoporids and cornu
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label
Microconchida
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