Hyolitha - Orthothecida - Allathecidae
Full reference: A. Y. Rozanov, V. V. Missarzhevsky, N. A. Volkova, L. G. Voronova, I. N. Krylov, B.M. Keller, I. K. Korolyuk, K. Lendzion, R. Mikhnyar, N. G. Pykhova, and A. D. Sidorov. 1969. Tommotskiu jarus i problema nizhney granisty kembriya [The Tommotian Stage and the Cambrian lower Boundary problem]. Trudy Geoligske Institut Leningrad 206:1-379
Parent taxon: Orthothecida according to P. Y. Parkhaev and Y. Demidenko 2010
See also Rozanov et al. 1969
Sister taxa: Aldanothecidae, Ancheilotheca, Bolitheca, Brevitheca, Bucanotheca, Carinitheca, Chelsonella, Circothecidae, Cupitheca, Curtitheca, Ebianotheca, Eogloborilus, Eonovitatus, Girvanolithes, Gracilithecidae, Grandicornus, Hexitheca, Inflaticornus, Isititheca, Khetatheca, Kotuyitheca, Lophotheca, Minitheca, Mooritheca, Neobactrotheca, Nikatheca, Novitatidae, Orthothecidae, Panitheca, Paragloborilus, Petasotheca, Plicitheca, Probactrotheca, Renitheca, Sysoievia, Tchuranitheca, Tetratheca, Tetrathecidae, Triplicatellidae, Turcutheca
Subtaxa: Allatheca Antiquatheca Doliutus Exilitheca Majatheca
Type: Allatheca
Ecology: stationary epifaunal suspension feeder
Distribution:
• Cambrian of Canada (10: Newfoundland and Labrador, Nova Scotia collections), China (8), Greenland (2), India (1), Iran (1), Kazakhstan (1), the Russian Federation (41), the United Kingdom (2), United States (3: Massachusetts)
• Placentian of Canada (1: Nova Scotia), United States (3: Massachusetts)
Total: 73 collections including 98 occurrences