This week, for Monday we have a phylogenetic tree constructed from the organisms whose relationships are represented. This one uses their shells to depict the evolutionary relationships between the eight classes of molluscs: Bivalvia (bivalves), Cephalopoda (octopuses, squids, etc), Chaetodermomorpha (caudofoveates), Gastropoda (snails, slugs), Monoplacophora, Neomeniomorpha (solenogasters), Polyplacophora (chitons), Scaphopoda (tusk shells).
The picture is by Richard Edwards, who took the photo at the Oxford University Museum of Natural History.
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