Obolellida is a small, extinct order of inarticulate brachiopods that existed from the early to middle Cambrian period. The relationship of the Obolellida with other inarticulates is unclear, and were previously grouped together with the Siphonotretacea, before being given their own order. ==Anatomy== The shell is typically impunctate, biconvex, a...
Found on
http://en.wikipedia.org/wiki/Obolellida
(from the article `lamp shells`) ...contains phosphate or is punctate calcareous; pedicle opening confined to the ventral valve; 62 genera; Early Cambrian (550,000,000 years ago) to ...
Found on
http://www.britannica.com/eb/a-z/o/3
No exact match found.
