Temporal range: Lower Cambrian
Mobergella is a millimetric Lower Cambrian shelly fossil of unknown affinity, usually preserved in phosphate and particularly well known from Swedish strata, where it is diagnostic of lowermost Cambrian rocks. Originally interpreted as a monoplacophoran, the circular, cap-shaped shell resembles a hyolith operculum, with concentric rings on its upper surface, and seven pairs of internal muscle scars; however it is never found in association with a hyolith conch, and its affinity therefore remains undetermined.
Some specimens bear evidence of healed injuries.
The genus is unique to Lower Cambrian strata and has been found throughout the northern hemisphere.
- Bengtson, S. (1968). "The problematic genus Mobergella from the Lower Cambrian of the Baltic area". Lethaia. 1 (4): 325–351. doi:10.1111/j.1502-3931.1968.tb01625.x.
- Conway Morris, S. (1995). "Enigmatic shells, possibly halkieriid, from the Middle Cambrian Burgess Shale, British Columbia". Neues Jahrbuch für Geologie und Paläontologie – Abhandlungen. 195 (1): 319–331.
- Skovsted, C. B. (2003). "Mobergellans (Problematica) from the Cambrian of Greenland, Siberia and Kazakhstan". Paläontologische Zeitschrift. 77 (2): 429–443. doi:10.1007/BF03006952.
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