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Temporal range: Lower Cambrian
Scientific classification e
Kingdom: Animalia
Phylum: incertae sedis
Family: Mobergellidae
Genus: Mobergella
Moberg, 1892
  • M. (= Discinella) holsti Moberg, 1892
  • M. radiolata Bengtson, 1968
  • M. turgida Bengtson, 1968

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.[1] Originally interpreted as a monoplacophoran,[1] 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.[2]

Some specimens bear evidence of healed injuries.[1]


The genus is unique to Lower Cambrian strata and has been found throughout the northern hemisphere.[3]


  1. ^ a b c 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. 
  2. ^ 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. 
  3. ^ Skovsted, C. B. (2003). "Mobergellans (Problematica) from the Cambrian of Greenland, Siberia and Kazakhstan". Paläontologische Zeitschrift. 77 (2): 429–443. doi:10.1007/BF03006952.