Brachiopoda (Lamp Shells)

Phylum Brachiopoda (Lampshells)

Wikipedia entry

Approximate Number of Species: 335

Largest:  Magellania venosa at a length of 5 inches (127 mm)

Smallest:  Gwynia capsula at a length of  0.04 inches (1 mm)

Brachiopod : Photo used with permission from Steve Knight, BeachcomberCo via Flikr
References:

Brusca RC & Brusca GJ (2003) Invertebrates (Sinauer Associates, Inc., Publishers, Sunderland, MA) 2nd Ed.

McCammon HM (1973) The ecology of Magellania venosa, an articulate brachiopod. Journal of Paleontogy 47:266-278.

Logan A, MacKinnon DI, & Phorson JE (1997) Morphology, distribution, life habits and phylogenetic affinities of the Recent brachiopod Gwynia capsula (Jeffreys). P.S.Z.N. 1. Mar. Ecol. 19:239-252.