exumbrellan.
/ɛksʌmˈbrɛlə/ Zoology.
The aboral or outer surface of the umbrella of a jellyfish.
ΚΠ
1886 A. W. Greely 3 Years Arctic Service II. 400 The genus Nauphanta is a characteristic one, and is remarkable in the peculiar sculpturing of the exumbrella, the division of the umbrella on the exumbral side into a central and coronal or peripheral zone.
1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 745 The mesoglaea of the aboral aspect of the bell is much thickened to form the umbrella s. exumbrella.
1897 T. J. Parker & W. A. Haswell Text-bk. Zool. I. 124 The convex outer surface of the bell or umbrella..by which the zooid was originally attached to the blastostyle is distinguished as the ex-umbrella, the concave inner surface as the sub-umbrella.
1907 Gentleman's Mag. July 97/2 The tentacles..imbedded in ridges of jelly of the exumbrella.
1940 L. H. Hyman Invertebrates I. vii. 373 The medusa form resembles a deep to shallow bowl of gelatin, termed the bell or umbrella; the convex aboral surface is called the exumbrella, the concave oral surface, the subumbrella.
1967 P. A. Meglitsch Invertebr. Zool. vi. 151/1 Small particles and plankton are caught in slime secreted on the exumbrella.
Derivatives
exumˈbrellar adj. of or pertaining to the exumbrella.
ΘΚΠ
the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [adjective] > abumbrellar
abumbral1880
abumbrellar1884
exumbrellar1888
1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 783 If the Ephyra be regarded from the dorsal, i.e. exumbrellar aspect.
1888 G. Rolleston & W. H. Jackson Forms Animal Life (ed. 2) 784 The sense-bodies are usually protected by a dorsal, i.e. exumbrellar covering-piece or hood.
This entry has not yet been fully updated (first published 1933; most recently modified version published online June 2018).
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n.1886