Miguel Moreno-Azanza has passed me some very good papers related to
the evolution of vertebrate reproduction!

Anybody interested in the paper send me an email!

Live birth in the Devonian period
John A. Long1,2,3, Kate Trinajstic4, Gavin C. Young2 & Tim Senden5
The extinct placoderm fishes were the dominant group of vertebrates
throughout the Middle Palaeozoic era1, yet controversy
about their relationships within the gnathostomes (jawed vertebrates)
is partly due to different interpretations of their reproductive
biology2–5. Here we document the oldest record of a
live-bearing vertebrate in a new ptyctodontid placoderm,
Materpiscis attenboroughi gen. et sp. nov., from the Late
Devonian Gogo Formation of Australia (approximately 380 million
years ago)6. The new specimen, remarkably preserved in three
dimensions, contains a single, intra-uterine embryo connected by
a permineralized umbilical cord. An amorphous crystalline mass
near the umbilical cord possibly represents the recrystallized yolk
sac.Another ptyctodont fromtheGogo Formation, Austroptyctodus
gardineri 7, also shows three small embryos inside it in the same
position. Ptyctodontids have already provided the oldest definite
evidence for vertebrate copulation8, and the newspecimens confirm
that some placoderms had a remarkably advanced reproductive
biology, comparable to that of some modern sharks and rays. The
new discovery points to internal fertilization and viviparity in
vertebrates as originating earliest within placoderms.