There was a walrus skeleton in the hallway of the building from which I sent my previous message. I am quite aware that pinnipeds have two hind limbs. My point was that, in many, they do not function independently. The examples I gave were of functional tripods; in all cases the actual number of limbs was four.
A variety of Ediacaran animals, notably Tribrachidium, as well as some nematodes, show triradial symmetry but do not use legs for moving around. Unipedal motion is reasonably common among invertebrates, along with many having more than four legs.
Dr. David Campbell
"Old Seashells"
46860 Hilton Dr #1113
Lexington Park MD 20653 USA
bivalve@mail.davidson.alumlink.com
"That is Uncle Joe, taken in the masonic regalia of a Grand Exalted Periwinkle of the Mystic Order of Whelks"-P.G. Wodehouse, Romance at Droigate Spa
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