FTP, identify this rethinking of evolutionary theory first proposed in a 1972 paper by Niles Eldridge and Stephen Jay Gould.
Pulmonate gastropods were one of the two taxa discussed in the original proposal.  According to Richard Dawkins, the concept was found in Darwin's own works, meaning that the opposing idea of "phyletic gradualism" was essentially a strawman created by the two authors.  They instead proposed that most speciation occurs in small, geographically isolated populations, and thus appears in the fossil records as a sudden transition from one form to the next.  FTP, identify this rethinking of evolutionary theory first proposed in a 1972 paper by Niles Eldridge and Stephen Jay Gould.
Pulmonate gastropods were one of the two taxa discussed in the original proposal.  
punctuated equilibrium