Tommotiida Missarzhevsky, 1970

Kouchinsky, Artem, Bengtson, Stefan, Clausen, Sébastien & Vendrasco, Michael J., 2015, An early Cambrian fauna of skeletal fossils from the Emyaksin Formation, northern Siberia, Acta Palaeontologica Polonica 60 (2), pp. 421-512 : 457

Order Tommotiida Missarzhevsky, 1970 Family Tommotiidae Bengtson, 1970 Genus Camenella Missarzhevsky in Rozanov and Missarzhevsky, 1966

Type species: Camenella garbowskae Missarzhevsky in Rozanov and Missarzhevsky, 1966; Dokidocyathus regularis Zone, Tommotian Stage , lower Cambrian; Chekurovka village, lower Lena River, Siberia.

Remarks.—See Bengtson (1986a) and Skovsted et al. (2009) for emended diagnosis of the genus, synonymics and discussion of the nominal species included in Camenella . The sellate sclerites, Camenella garbowskae Missarzhevsky in Rozanov and Missarzhevsky, 1966 and mitral sclerites, C. kozlowskii Missarzhevsky in Rozanov and Missarzhevsky, 1966 are unified herein within one species, C. garbowskae Missarzhevsky in Rozanov and Missarzhevsky, 1966. As in other species of Camenella described with a bimembrate scleritome model (see Skovsted et al. 2009), sinistral and dextral symmetry variants (D- and L-forms sensu Bengtson 1970) of both types of sclerites co-occur. The sclerites are of the same size range and share similar surface ornamentation with radial and comarginal folds.