PSW: Carl Simpson on bryozoan polymorphs

The Paleontological Society of Washington

Wednesday, October 21, 7:00 pm, in the Cooper room (E-207A), National Museum of Natural History, Constitutional Ave. entrance

Determinants of bryozoan polymorphism

Carl Simpson

Department of Paleobiology, NMNH, Washington D.C. 20059

The members of a bryozoan colony can have dramatic morphological differences. When this occurs the modified members are termed polymorphs. The evolution of polymorphism is an old problem that has resisted understanding since Darwin. I test and reject a hypothesis of environmental control and propose another based on the construction of life-history strategies coupled with the origin of novel polymorph types.

Non-Smithsonian visitors will be escorted to the Cooper Room at 6:45 and 6:55 p.m. Society members will host the speaker for dinner at the Elephant & Castle (1201 Pennsylvania Ave.) prior to the meeting. Members may meet at the restaurant or inside the Constitutional Ave. entrance of the NMNH at 5:00 and walk to the restaurant as a group.

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