Long, JohnTrinajstic, KateJohanson, Zerina2015-12-100028-0836http://hdl.handle.net/1885/52419Evidence of reproductive biology is extremely rare in the fossil record. Recently the first known embryos were discovered within the Placodermi, an extinct class of armoured fish, indicating a viviparous mode of reproduction in a vertebrate group outsideKeywords: element; copulation; embryo; fertilization (reproduction); fish; fossil record; phylogenetics; reproductive biology; animal experiment; article; articular cartilage; Australia; biodiversity; convergent evolution; Devonian; embryo; embryo development; fert200910.1038/nature077322016-02-24