sub

gastropods having the gills when present posterior to the heart and having no operculum: includes sea slugs

sub

seed shrimps

sub

generalized extinct mammals widespread during the Jurassic

sub

plantlike flagellates containing chlorophyll

sub

echidnas

sub

creeping protozoans: amoebas and foraminifers

sub

a group of trees and shrubs and herbs mostly with polypetalous flowers

sub

sharks

sub

extinct reptiles of the Permian to Jurassic considered ancestral to mammals

sub

large diverse group of bony fishes

sub

parasitic sporozoans that form spores containing one or more infective sporozoites

sub

in some classifications considered a phylum of the kingdom Protista