Palaeoconchus angulatus (Hall, 1861) on a brachiopod from the Middle Devonian (Givetian) of Michigan
Scientific classification
Domain:
Eukaryota
Kingdom:
Animalia
Class:
†Tentaculita
Order:
†Microconchida Weedon 1991
Genera
Microconchus
Palaeoconchus
Annuliconchus
Punctaconchus
Polonoconchus
Helicoconchus
Helicoconchus elongatus, a microconchid from the Lower Permian of Texas. (See Wilson et al., 2011).Punctaconchus midfordensis (Richardson, 1907). Bajocian, Clypeus Grit Member, Worgan's Quarry, Gloucestershire, UK.
Paleontology portal
The order Microconchida is a group of small, spirally-coiled, encrusting fossil "worm" tubes from the class Tentaculita found from the Upper Ordovician to the Middle Jurassic (Bathonian) around the world.[1][2][3][4][5] 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.[6] All pre-Cretaceous "Spirorbis" fossils are now known to be microconchids.[6] 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 cornulitids.[3]
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Paleontology portal The order Microconchida is a group of small, spirally-coiled, encrusting fossil "worm" tubes from the class Tentaculita found from...
feather duster worms Phoronida, the phylum containing horseshoe worms Microconchida, an order of extinct tubeworms Kuphus polythalamia , a bivalve mollusk...
Zatoń; Ewa Olempska (2016). "A family-level classification of the Order Microconchida (Class Tentaculita) and the description of two new microconchid genera"...
member of Microconchida. Microconchus maya Sp. nov Valid Heredia-Jiménez et al. Permian (Roadian) Paso Hondo Mexico A member of Microconchida. Monograptus...
Mississippian) Bluestone Formation Hinton Formation United States A member of Microconchida (a group of animals of uncertain phylogenetic placement, possibly molluscs)...
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