Phylogeny of some lophotrochozoan worms

1
Phylogeny of some lophotrochozoan worms
Annelida
Platyhelminthes
Sibloglinidae
Polychaeta
Sipuncula
Nemertea
DOM or chemosynthetic bacteria
nutrition source
non-linear (U-shaped) introvert urn cells
gut form feeding structure coelomic scavengers
parapodia segmentation setae
appendages body layout chitinous structures
coelom metanephridium gas-permeable
cuticle contractile
body cavity excretory structure extracellular
covering blood-vascular system
rynchocoel eversible proboscis non-contractile
fluid-filled cavity prey capture device
blood-vascular system
complete and linear
digestive system
bilateral protonephridium triploblastic ventral
nerve cords, ganglia (central nervous system)
symmetry excretory structure tissue
layers nervous system