Hydrozoan.
/hʌɪdrə(ʊ)ˈzəʊə/ Zoology.
With plural agreement. A class of Cœlenterate animals, chiefly marine, simple or more frequently compound, found in all parts of the world, and differing widely in form and complexity of structure; the individual zooid consists of a soft gelatinous sac composed of an outer and inner layer of cells (ectoderm and endoderm), and usually with tentacles surrounding the mouth. Familiar examples are the freshwater hydra, and the various organisms called acalephs, medusæ, or jellyfishes.
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the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [noun] > class Hydrozoa
Hydrozoa1843
1843 R. Owen Lect. Compar. Anat. Invertebr. Animals vii. 82 The first and lowest organised class [of Radiata], which I have called Hydrozoa.
1843 R. Owen Lect. Compar. Anat. Invertebr. Animals Gloss. Hydrozoa, the class of Polypi organised like the Hydra.
1858 Huxley (title) Monograph of the Oceanic Hydrozoa.
1870 H. A. Nicholson Man. Zool. 67 The Hydrozoa are all aquatic, and the great majority are marine.
Derivatives
hydroˈzoal adj. of or belonging to the class Hydrozoa.
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the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [adjective] > of class Hydrozoa
pulmograde1848
hydrozoic1869
hydrozoal1870
hydrozoan1889
1870 H. A. Nicholson Man. Zool. I. 96 There are no fossil remains which would be universally conceded to be of a Hydrozoal nature.
hydroˈzoan n. an animal of this class.
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the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [noun] > class Hydrozoa > member of
pulmograde1841
pulmonigrade1846
hydrozoan1877
hydrozoon1877
1877 J. Le Conte Elements Geol. (1879) ii. 244 A compound Hydrozoan allied to Sertularia.
hydroˈzoan adj. = hydrozoal adj.
ΘΚΠ
the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [adjective] > of class Hydrozoa
pulmograde1848
hydrozoic1869
hydrozoal1870
hydrozoan1889
1889 Cent. Dict. IV. (rev. ed.) Hydrozoan adj.
hydroˈzoic adj. = hydrozoal adj.
ΘΚΠ
the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [adjective] > of class Hydrozoa
pulmograde1848
hydrozoic1869
hydrozoal1870
hydrozoan1889
1869 T. H. Huxley Critiques & Addr. (1873) 315 The formation of a radiate Medusa upon a Hydrozoic stock.
1880 Libr. Universal Knowl. II. 563 The equivalent of the individual comatula is the hydrozoic stock plus all the Medusae which proceed from it.
hydrozoon n. /haɪdrə(ʊ)ˈzəʊɒn/ an animal of this class.
/haɪdrə(ʊ)ˈzəʊɒn/ an animal of this class.ΘΚΠ
the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [noun] > class Hydrozoa > member of
pulmograde1841
pulmonigrade1846
hydrozoan1877
hydrozoon1877
1877 T. H. Huxley Man. Anat. Invertebrated Animals iii. 111 The embryo sponge is..similar to the corresponding stage of a hydrozoon, and is totally unlike any known condition of a protozoon.
This entry has not yet been fully updated (first published 1899; most recently modified version published online December 2020).
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n.1843