JELLYFISH - SIPHONOFORA

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Vintage-Views Antique Prints and Maps :: Antique Prints :: Natural History :: Marine :: JELLYFISH - SIPHONOFORA - COMB JELLYFISH, MEDUSEN,1894 Original Antique Wood Engraving

JELLYFISH - SIPHONOFORA - COMB JELLYFISH, MEDUSEN,1894 Original Antique Wood Engraving

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Jellyfish are marine invertebrates belonging to the Scyphozoan class, and in turn the phylum Cnidaria. The body of an adult jellyfish is composed of a bell-shaped, jellylike substance enclosing its internal structure, from which the creature's tentacles suspend. Each tentacle is covered with stinging cells (cnidocytes) that can sting or kill other animals: most jellyfish use them to secure prey or as a defense mechanism. Others, such as Rhizostomae, do not have tentacles at all. To compensate for its lack of basic sensory organs and a brain, the jellyfish exploits its nervous system and rhopalia to perceive stimuli, such as light or odor, and orchestrate expedient responses. In its adult form, it is composed of 94-98% water and can be found in every pelagic area of the world. Siphonophora is an order of the Hydrozoa, a class of marine invertebrates belonging to the phylum Cnidaria. They are colonial, and the colonies may superficially resemble jellyfish. The best known species is the Portuguese Man o' War. Each Man o' War is a colony. They are composed of medusoid and polypoid zooid that are morphologically and functionally specialised. The integration of the zooids can be so strong that the colony attains the character of an individual. .The ctenophore (pl. ctenophores or ctenophora), also known as the comb jelly, is a phylum classically grouped with Cnidaria in the Coelenterata infrakingdom. The phylum includes the sea gooseberry (Pleurobrachia pileus) and the Venus' girdle (Cestum veneris). The word ctenophore (pronounced without the c, comes from Greek, kteno-, kteis, "comb" and -phore, meaning "bearer". It comes via the New Latin ctenophorus in the 19th century. Despite their appearance, they are zoologically not true jellyfish, not least because they lack the characteristic cnidocytes. There are more than 100 varieties of ctenophore spread throughout the worlds' oceans, which form a considerable proportion of the entire plankton biomass. A few species, such as the sea gooseberry, native to the North Sea, have reached such high populations that they clog fishermen's nets, while of other species only a few examples are known. The fragile makeup of ctenophora makes research into their way of life extremely difficult; for this reason data on their lifespan is not available, but it is known that ctenophora begin to reproduce even before they reach adulthood, and so can be assumed to have a short generation cycle. PRINT SHOWS: * COTYLORHIZA TUBERCULATA * LIZZIA KOELLILERII * TIMA FLAVILABRIS * CARMARINA HASTATA * OLINDIAS MULLERII * VELELLA SPIRANS * PORPITA MEDITERRANEA * PHYSIPHORA HYDROSTATICA * EUCHARIS MULTICORNIS * CALLIANIRA BIALATA * BEROE FORSKALII

Published for Joseph Meyer Meyers Konversations

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SKU	0527658k6
Quantity in stock	1 item(s) available
Price:	US$15.00

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