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"The common Sea-anemone." -Parker, 1900

Common Sea Anemone

"The common Sea-anemone." -Parker, 1900

"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

This organ-pipe coral is a well-known red coral. They are classified as cnidarians.

Coral

This organ-pipe coral is a well-known red coral. They are classified as cnidarians.

Madrepore ("mother of pores") is a coral of the genus Madrepora, found often forming reefs or islands in tropical locations. They reproduce in three separate ways as discovered by the Victorian marine zoologist Anna Thynne (1806-1866). The name was formerly applied universally to any stone coral.

Madrepore Coral

Madrepore ("mother of pores") is a coral of the genus Madrepora, found often forming reefs or islands…

Madrepore ("mother of pores") is a coral of the genus Madrepora, found often forming reefs or islands in tropical locations. They reproduce in three separate ways as discovered by the Victorian marine zoologist Anna Thynne (1806-1866). The name was formerly applied universally to any stone coral.

Madrepore Coral

Madrepore ("mother of pores") is a coral of the genus Madrepora, found often forming reefs or islands…

Flabellum alabastrum is a fan-shaped stony coral in the suborder Caryophylliina.

Stony Coral

Flabellum alabastrum is a fan-shaped stony coral in the suborder Caryophylliina.

The phylum Ctenophora , commonly known as comb jellies, is a phylum that includes the sea gooseberry (Pleurobrachia pileus) and Venus' girdle (Cestum veneris). Classically grouped with Cnidaria (jellyfish) in the Coelenterata infrakingdom, ctenophores have recently been identified as the most basal known lineage of animals.

Ctenopore

The phylum Ctenophora , commonly known as comb jellies, is a phylum that includes the sea gooseberry…

The phylum Ctenophora , commonly known as comb jellies, is a phylum that includes the sea gooseberry (Pleurobrachia pileus) and Venus' girdle (Cestum veneris). Classically grouped with Cnidaria (jellyfish) in the Coelenterata infrakingdom, ctenophores have recently been identified as the most basal known lineage of animals.

Transverse Section of Ctenopore

The phylum Ctenophora , commonly known as comb jellies, is a phylum that includes the sea gooseberry…

"Hormiphora (Cydippe) plumosa. A, from the side; B, from the aboral pole. mth, mouth; s. pl, swimming plates; t and b, tentacles." -Parker, 1900

Hormiphora Plumosa

"Hormiphora (Cydippe) plumosa. A, from the side; B, from the aboral pole. mth, mouth; s. pl, swimming…

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…

Jellyfish are saucer-shaped and can be a foot or more in diameter. They are gelatinous and semitransparent.

Jellyfish

Jellyfish are saucer-shaped and can be a foot or more in diameter. They are gelatinous and semitransparent.

"Scyphistoma stage of Cyanaea capillata, showing two ordinary hydrae tubae, between which are two others, a, b, undergoing fission (the strobila stage)." -Whitney, 1911

Lion's Mane Jellyfish

"Scyphistoma stage of Cyanaea capillata, showing two ordinary hydrae tubae, between which are two others,…

The Portugures man-of-war has a bladderlike float, and locomotion depends upon the wind and current. they have well-developed stinging cells.

Portuguese Man-of-War

The Portugures man-of-war has a bladderlike float, and locomotion depends upon the wind and current.…

The Sea-Fir (Sertularia tubitheca) is mistaken as a plant but is actual a hydrozoan animal of the phylum Cnidaria.

Sea-Fir

The Sea-Fir (Sertularia tubitheca) is mistaken as a plant but is actual a hydrozoan animal of the phylum…