|Pot-bellied seahorse (Hippocampus abdominalis) from Sketchbook of Fishes|
by William Buelow Gould (1801-53)
Many of the same genes or their homologs are upregulated during pregnancy in mammals and other viviparous taxa. Placentologists will want to scan the tables for their favourite genes. I found it interesting that genes involved in lipid transport and iron transfer are upregulated.
The authors suggest the possibility that a common toolkit of genes is recruited to support pregnacy in mammals, reptiles and live-bearing fish.