|Basic info||Taxonomic history||Classification||Relationships|
|Morphology||Ecology and taphonomy||Age range and collections|
Tommotiida - Tommotiidae
It was synonymized subjectively with Tommotia by Bengtson (1970).
It was assigned to Camenidae by Rozanov et al. (1969); to Mitrosagophora by Sepkoski (2002); and to Tommotiidae by Skovsted et al. (2009).
Is something missing? Join the Paleobiology Database and enter the data
If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.
|C. B. Skovsted et al. 2009||Tommotiids with solid, densely lamellar sclerites. Surface sculpture of fine growth striae, larger co−marginal ribs and occasional transverse ribs radiating from the umbo. Two types of sclerites; pyramidalmitrals and saddle-shaped sellates. Mitral sclerites with subquadrate cross−section, a pointed umbo and a system of pronounced radiating folds on one or occasionally two opposing sides. Sellate sclerites strongly asymmetrical and compressed with marginal, sometimes coiled apex, dorsal surface with two lobes of unequal size separated by a depressed sella and ventral surface often with distinct duplicature. Both sclerite types occur in dextral and sinistral symmetry variants. Differs from Lapworthella and related genera by the presence of two distinct sclerite types, and from Dailyatia and Kennardia by the absence of bilaterally symmetrical sclerites.|