Ambulacral

Ambulacral is a term typically used in the context of anatomical parts of the phylum Echinodermata or class Asteroidea and Edrioasteroidea. Echinoderms can have ambulacral parts that include ossicles, plates, spines, and suckers. For example, sea stars or "star fish" have an ambulacral groove on their oral side (underside). This ambulacral groove extends from the mouth to the end of each ray or arm. Each groove of each arm in turn has four rows of hollow tube feet that can be extended or withdrawn. Opposite the ambulacral groove is an ambulacral ridge on the aboral side of each ray, known as an ambulacrum. These have interambulacra between them.

Not to be confused with Ambulacrum.

Etymology

From the Latin 'ambulācrum', meaning 'walk planted with trees', 'avenue', 'alley' and 'walking place' Derives from' 'ambulāre', meaning 'to walk' or 'Amble' meaning 'To walk slowly or leisurely'.[1]

Has Indo-European roots - deriving from 'Ambhi':[2]

Sources
gollark: Also, I would write down trading rules!
gollark: I will also add nine extra tiers of prize dragon and equivalent normal dragons.
gollark: Free CB Prizes to whoever votes for me if I win!
gollark: How about you can see the ID of the dragon, i.e. which number it is (first dragon ever, second dragon ever, 5372th dragon ever etc)?
gollark: I would make codes into sequences of randomly picked words.

References
  1. The Free Dictionary (n.d.) amble, [online] Available at: http://www.thefreedictionary.com/amble [Accessed 14th Nov 2014].
  2. The Free Dictionary (n.d.) ambulacra, [online] Available at: http://www.thefreedictionary.com/ambulacra [Accessed 14th Nov 2014].


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