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"Gonoblastidium of Athorybia rosacea, bearing three hydroclysts, a, a gynophore, b, and two androphores, c." -Whitney, 1911

Athorybia Gonoblastidium

"Gonoblastidium of Athorybia rosacea, bearing three hydroclysts, a, a gynophore, b, and two androphores,…

"B, male gonophore of Athorybia rosacea." -Whitney, 1911

Athorybia Gonophore

"B, male gonophore of Athorybia rosacea." -Whitney, 1911

"A, female gonophores of Athorybia rosacea on their common stem or gynophore: a, ovum; b, radial canals." -Whitney, 1911

Athorybia Gonophores

"A, female gonophores of Athorybia rosacea on their common stem or gynophore: a, ovum; b, radial canals."…

"C, female gonophores: a, genital vesicle; b, vitellus; c, radial canals." -Whitney, 1911

Athorybia Gonophores

"C, female gonophores: a, genital vesicle; b, vitellus; c, radial canals." -Whitney, 1911

"D, female gonophores, enlarged: c, radial canals; d, canal of manubrial cavity." -Whitney, 1911

Athorybia Gonophores

"D, female gonophores, enlarged: c, radial canals; d, canal of manubrial cavity." -Whitney, 1911

Hydra are in the Jellyfish family, class Hydrozoa.

Hydra

Hydra are in the Jellyfish family, class Hydrozoa.

Hydra are in the Jellyfish family, class Hydrozoa. Cross-section of the body showing the two layers of cells of the body wall.

Hydra

Hydra are in the Jellyfish family, class Hydrozoa. Cross-section of the body showing the two layers…

"A, Longitudinal section through the body of Hydra (diagrammatic). B, small portion of the wall more highly magnified. b, bud; ect., ectoderm; ent., entoderm; f, foot; fl., flagellum; g.v., gastro-vascular cavity; m., mouth; mes., mesenchyma (non-cellular); m.f., muscular processes of the ectodermal cells; n, nettling cells; n', same, exploded; nu., nucleus; t, tentacle; v, vacuole." -Galloway, 1915

Hydra

"A, Longitudinal section through the body of Hydra (diagrammatic). B, small portion of the wall more…

Colonial, plant-like animals closely related to jellyfish, with stinging cells, Any member of the invertebrate order Hydroida (class Hydrozoa, phylum Cnidaria). Hydroids have three basic life-cycle stages: (1) a tiny free-swimming planula larva about 1 mm (0.04 inch) long, which settles and grows into (2) a sessile (attached), usually colonial hydroid stage, which in turn liberates (3) medusa.

Medusa of a Hydroid

Colonial, plant-like animals closely related to jellyfish, with stinging cells, Any member of the invertebrate…

Hydrozoa (hydrozoans) are a taxonomic class of very small, predatory animals which can be solitary or colonial and which mostly live in saltwater. A few genera within this class live in freshwater. Hydrozoans are related to jellyfish and corals and belong to the phylum Cnidaria.

Hydrozoa Encrusting a Small Shell

Hydrozoa (hydrozoans) are a taxonomic class of very small, predatory animals which can be solitary or…

"Hydrozoon is a name given to the great class of the sub-kingdom Cœlenterata, of which hydra is the type. They exhibit a definite histological structure, their tissues having a cellular organization. These tissues are two, an outer or ectoderm, and an inner or endoderm. In most the prey is seized by tentacles surrounding the mouth and furnished with offensive weapons called thread cells, The hydrozoa are all aquatic, and nearly all marine. Their distribution is world-wide. [Pictured] Hydra fusca, with a young bud at b, and a more advanced bud at c."—(Charles Leonard-Stuart, 1911)

Hydrozoon

"Hydrozoon is a name given to the great class of the sub-kingdom Cœlenterata, of which hydra is…

Jellyfish are generally of the hydrozoa family.

Jellyfish

Jellyfish are generally of the hydrozoa family.

Obelia, a simple polyp, vertical section, highly magnified, m = mouth opening, as.s = alimentary sac

Polyp

Obelia, a simple polyp, vertical section, highly magnified, m = mouth opening, as.s = alimentary sac