Lingulata - Lingulida - Obolidae
These rare but distinctive shells were referred originally to the family Acrotretidae (Nazarov & Popov 1980), but the baculate shell structure, smooth larval and postlarval shell, and the arrangement of the muscle scars suggest affinity with lingulides of the family Obolidae. However, the concave dorsal valve, significantly reduced dorsal pseudointerarea, and the strongly impressed central muscle scars separated by a median furrow reversed anteriorly into a short median ridge have no analogies any all other known obolid genera. Strongly impressed posterolateral dorsal muscle fields, which include sets of paired umbonal muscle scars, are also among distinctive features of this genus.
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Full reference: L. E. Popov. 2000. Late Ordovician linguliformean microbrachiopods from north-central Kazakhstan. Alcheringa 24:257-275
Parent taxon: Obolidae according to L.E. Popov 2000
See also Popov 2000
Sister taxa: Elliptoglossinae, Eodicellomus, Fordinia, Foveola, Glossellinae, Lingulella, Lingulellinae, Luthieria, Obolinae, Prastavia, Xianshanella
Subtaxa: Atansoria concava
Type: Atansoria concava
Ecology: stationary low-level epifaunal suspension feeder
Distribution: found only at F-1007a - Section north of Lake Atansor (Ordovician of Kazakhstan)
Specimen images are retrieved through the ePANDDA API.
Click image to enlarge. Click to access iDigBio record.