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68 Cards in this Set
- Front
- Back
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Cnidocyte
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specialized stinging cells that assists in prey capture and defense; most concentrated in tentacles and hypostome
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Polyp
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sessile form with oral surface up and aboral surface attached to substrate
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Medusa
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free swimming form with mouth downward
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Dimorphic
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having both forms of life cycle
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Nematocysts
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capsules discharged from cnidocytes triggered by cnidocils
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Hypostome
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conical elevation with mouth opening at its tip
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Tentacles
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food catching arms that radiate from the hypostome
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Gastrovascular cavity
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location where digestion and absorption of food occurs; some gas exchange also occurs here in the cells lining the cavity
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Mesoglea
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thin, gelatinous layer between epidermis and gastrodermis; provides support as the hydrostatic skeleton
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Epitheliomuscular cells
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act as epithelial and muscular cells; longitudinal found in epidermis; circular found in gastrodermis (hydra)
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Cnidocils
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projections on the outer surface of the cnidocyte; modified epidermal cilia
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Gland cells
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located in epidermis of basal disc; secrete a sticky substance used in anchorage to substrate; also in gastrodermis to secrete digestive enzymes
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Interstitial cells
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between epitheliomuscular cells; totipotent - act like stem cells
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Bell
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dome-shaped structure composed of epidermis, gastrodermis, and mesoglea
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Tentacular bulbs
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swellings at the base of each tentacle; contain interstitial cells which will develop into cnidocytes
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Adhesive pads
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near tip of tentacles; used in attachment
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Velum
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shelf under edge of bell; used in movement
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Manubrium
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tube that hangs in space inside the bell; connected to stomach
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Stomach (gonionemus)
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site of extracellular digestion
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Oral lobes
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assist with ingestion
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Radial canals
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extensions of the stomach
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ring canal
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connects ends of radial canals; stomach and canals form a continuous gastrovascular system where food is partially digested and circulated; food engulfed by cells of gastrodermis and digestion is completed intracellularly
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Statocysts
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swellings between the bases of tentacles; contain stones suspended on a stalk; used for orientation with respect to gravity
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Planula
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ciliated larva developed from zygote
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function of mucus in the worm
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protective layer for worm; also used for locomotion and respiration
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Prostomium
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fleshy lobe that precedes mouth
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Seminal Receptacles
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used to store mate's sperm
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Female genital pores
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where eggs are released
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Male genital pores
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where sperm are released
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Genital setae
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help hold ventral surfaces of partners together during copulation
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Clitellum
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secretes a mucus cocoon in which eggs and sperm are deposited
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Coelom
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fluid-filled body cavity
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Pharynx
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pulls soil and detritus into digestive tract
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Crop
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storage pouch
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Gizzard
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grinds up food
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Intestine
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digestible food materials and water are absorbed into blood
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typhlosole
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dorsal infolding of the intestine; increases the area of absorption of the intestine
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Seminal vesicles
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storage of worm's own sperm
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Testes
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produce sperm
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Ovaries
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produce eggs
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Dorsal blood vessel
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carries blood anteriorly towards aortic arches
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Aortic arches
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main pumping organs; send blood to ventral blood vessel
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Ventral blood vessel
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carries blood posteriorly
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Epidermis (worm)
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where gas exchange occurs
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Suprapharyngeal ganglia
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main center for coordination of sensory and motor functions
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Clitellum
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secretes a mucus cocoon in which eggs and sperm are deposited
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Coelom
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fluid-filled body cavity
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Pharynx
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pulls soil and detritus into digestive tract
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Clitellum
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secretes a mucus cocoon in which eggs and sperm are deposited
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Crop
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storage pouch
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Coelom
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fluid-filled body cavity
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Gizzard
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grinds up food
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Pharynx
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pulls soil and detritus into digestive tract
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Intestine
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digestible food materials and water are absorbed into blood
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typhlosole
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dorsal infolding of the intestine; increases the area of absorption of the intestine
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Seminal vesicles
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storage of worm's own sperm
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Intestine
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digestible food materials and water are absorbed into blood
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Testes
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produce sperm
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Ovaries
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produce eggs
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Dorsal blood vessel
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carries blood anteriorly towards aortic arches
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Seminal vesicles
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storage of worm's own sperm
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Aortic arches
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main pumping organs; send blood to ventral blood vessel
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Ventral blood vessel
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carries blood posteriorly
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Epidermis (worm)
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where gas exchange occurs
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Suprapharyngeal ganglia
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main center for coordination of sensory and motor functions
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Epidermis (worm)
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where gas exchange occurs
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Segmental ganglia
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coordinate muscular contractions of the body wall
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Nephridium
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picks up chemicals from coelomic fluid and from blood capillaries and excretes these wastes through the nephridiopore
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