The earliest fossil embryos begin to mature.
Gostling
Neil J
NJ
Department of Earth Sciences, University of Bristol, Bristol BS8 1RJ, UK. Neil.Gostling@bristol.ac.uk
Donoghue
Philip C J
PC
Bengtson
Stefan
S
D000818:Animals; D004622:Embryo, Mammalian / Q000648:ultrastructure*; D004625:Embryo, Nonmammalian; D005580:Fossils; D008855:Microscopy, Electron, Scanning