Mobergella

Mobergella Temporal range: Lower Cambrian PreЄ Є O S D C P T J K Pg N
Scientific classification
Kingdom:	Animalia
Phylum:	incertae sedis
Family:	Mobergellidae
Genus:	Mobergella Moberg, 1892
Species
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]

Occurrence

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

References

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.  edit
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 (inactive 2010-09-14). http://www.springerlink.com/content/k6l4454n002336w7.  edit