@article {6611,
	title = {Direct measurement of age in fossil <i>Gryphaea</i>: the solution to a classic problem in heterochrony},
	journal = {Paleobiology},
	volume = {25},
	number = {2},
	year = {1999},
	note = {PDF},
	month = {Spring},
	pages = {158-187},
	keywords = {bivalvia, evolution, gryphaea, gryphaeidae, heterochrony, mollusca, ostreoida, ostreoidea},
	author = {Jones, Douglas S. and Gould, Stephen Jay}
}
@article {6480,
	title = {Submarine cave Bivalvia from the Ryukyu Islands: sytematics and evolutionary significance},
	journal = {The University Museum, The University of Tokyo, Bulletin},
	volume = {35},
	year = {1993},
	note = {xerox},
	pages = {1-133},
	keywords = {bivalvia, ecology, evolution, heterochrony, malleidae, malleus, malvufundus, mollusca, pterioidea, taxonomy},
	author = {Hayami, Itaru and Kase, Tomoki}
}
