The majority of tommotiids are mineralised with calcium phosphate rather than calcium carbonate,[6] although silicified examples hint that some species bore carbonate or carbonaceous sclerites.[7]
Micrina and Paterimitra possess bivalved shells in their larval phases, which preserve characters that might position them in the Linguliformea and Rhynchonelliformea stem lineages respectively. This would indicate that the brachiopod shell represents the retention of a larval character.[8]
For a long part of their history, the tommotiids were only known from disarticulated shells - a complete organism had not been found. The 2008 discovery of Eccentrotheca offered the first insight into a complete organism, and permitted a reconstruction of the animal as a sessile, tube-like animal made up of a spiral of overlapping plates.[5][7] Articulated specimens of Paterimitra, discovered a year later, suggest a similar form and lifestyle - it is possible that many tommotiids need redescribing as sessile tube-dwellers.[9]Eccentrotheca and other similar sessile tommotiids were likely filter feeders, similar to modern lophophorates.[10]
However, the discovery of the articulated camenellanWufengella showed that it was a free-living worm-like animal, suggesting that it was not a crown-group lophophorate, as the last living common ancestor of all living lophophorates has been predicted to be sessile, as bryozoans, brachiopods and phoronids are. This indicates that tommotiids are paraphyletic, with some tommotiids more closely related to bryozoans, brachiopods and phoronids than to other tommotiids.[10]
These discoveries have produced an alternative model for the origin of the brachiopods; it suggested that they evolved by the reduction of sessile tube-like organisms, until only two shells were left. This contrasts with the brachiopod fold hypothesis which suggests that they formed by the folding of a halkieriid-like organism.[5]
^ abSkovsted CB, Brock GA, Topper TP, Paterson JR, Holmer LE (2011). "Scleritome construction, biofacies, biostratigraphy and systematics of the tommotiid Eccentrotheca helenia sp. nov. from the Early Cambrian of South Australia". Palaeontology. 54 (2): 253–286. doi:10.1111/j.1475-4983.2010.01031.x.
^ abcSkovsted CB, Brock GA, Paterson JR, Holmer LE, Budd GE (February 2008). "The scleritome of Eccentrotheca from the Lower Cambrian of South Australia: Lophophorate affinities and implications for tommotiid phylogeny". Geology. 36 (2): 171–174. Bibcode:2008Geo....36..171S. doi:10.1130/G24385A.1.
