Fig. 3
From: Evidence for a cordal, not ganglionic, pattern of cephalopod brain neurogenesis
Phylogenetic analysis of ELAV and ELAV-like genes. Invertebrates, including sponges, cnidarians and placozoans, have a single neural ELAV gene, while jawed vertebrates have four or more. In addition, ELAV-like genes are present in cnidarians and lophotrochozoans, but not deuterostomes and (apparently) ecdysozoans. In O. bimaculoides, we find two ELAV-like genes and one neural ELAV gene. Relationships of metazoan ELAV and ELAV-like genes are illustrated by an approximately maximum likelihood tree with genes from O. bimaculoides (Obi), Sepia officinalis (Sof), Lottia gigantea (Lgi), Aplysia californica (Aca), Capitella teleta (Cte), Saccoglossus kowalevskii (Sko), Branchiostoma floridae (Bfl), Danio rerio (Dre), Mus musculus (Mmu), Homo sapiens (Hsa), Tribolium castaneum (Tca), Gryllus bimaculatus (Gbi), Apis melifera (Ame), Anopheles darlingi (Ada), Amphimedon queenslandica (Aqu), Trichoplax adhaerens (Tad) and Nematostella vectensis (Nve). Likelihood support indicated at nodes