polianadj.
/ˈpəʊlɪən/, U.S. /ˈpoʊliən/ Zoology.
Designating each of the sacs or tubes connected with the circular vessel of the water-vascular system in many echinoderms. Chiefly in Polian vesicle.
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the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [noun] > subphylum Eleutherozoa > class Echinoidea > member of (sea-urchin) > parts of > caecal canal
Polian vesicle1852
the world > animals > invertebrates > subkingdom Metazoa > grade Triploblastica or Coelomata > phylum Echinodermata > [noun] > subphylum Eleutherozoa > class Holothurioidea > member of (sea-cucumber) > parts of > caecal canal
Polian vesicle1852
1852 Philos. Trans. (Royal Soc.) 142 608 In the Sipunculidæ there are no ‘Polian vesicles’ attached to or developed from this vessel.
1870 G. Rolleston Forms Animal Life 155 Contractile Polian vesicle-like sacs are developed.
1962 D. Nichols Echinoderms iii. 40 In some Asteroids (though not in the common Asterias) the vessel also bears polian vesicles interradially, which are muscular sacs with the probable function of maintaining turgor in the system.
2000 Invertebr. Reprod. & Devel. 37 137 Ends of the hydrocoel fuse to form a ring canal on which five primary tentacles, radial canals, a polian vesicle, and a hydroporic canal are formed.
This entry has been updated (OED Third Edition, September 2006; most recently modified version published online March 2022).
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adj.1852