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31 Cards in this Set
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Phylum Molluska: (5)
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- soft-bodied animals
- second largest phylum next to Arthropods - very diverse; simplest to most complex invertebrates - sizes range from small to giant (18m) - 80% are less than 10cm long |
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Characteristics of Mollusks: (8)
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- bilateral symmetry
- muscular foot - mantle (body covering) - coelomates - complex digestive system with radula - open circulatory system (except Cephalopods) - metanephridia (pair of kidneys) - found in sea, freshwater and on land |
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Economic Importance:
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- food: clams, oysters, squid
- pearls - some destructive: burrowing shipworms (type of clam) - snails and slugs damage gardens and flowers |
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Head-Foot Part
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- most active part
- contains feeding, sensory, and locomotor organs - most have cephalization - have radula - large muscular foot |
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Feeding Habits of Gastropoda:
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- herbivorous, scrape algae using radula
- some scavengers, some predators (moon snail) - two pairs of tentacles on head - secrete trail of slime or mucous |
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Radula
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Tongue-like organ with teeth that scrape, tear, or cut food material
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Muscular foot
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Used for locomotion and attachment
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Visceral Mass
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- contains digestive, circulatory, respiratory and reproductive organs
- mantle - mantle cavity |
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Mantle Cavity
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Space between mantle and visceral mass
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Mantle
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Sheath of skin that covers internal organs
- secretes shell |
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Importance of Mantle Cavity:
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- houses respiratory organs
- products from digestive, excretory, and reproductive system empty into mantle cavity |
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Phylum Molluska Contains:
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Classes:
Polyplacophora Gastropoda Bivalvia Cephalopoda |
- many plates (chitons)
- snails, slugs, whelks; belly foot - to valves, 2 parts, pelecypoda (hatchet foot) - head foot, squid, octopus, nautilus, cuttlefish |
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Internal Structures:
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- respiratory, gills or lungs
- open circulatory with pumping hear and blood vessels - complete digestive tract - simple nervous system with sense organs - most dioecious |
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Polyplacophora ()
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Chitons; bearing many plates
-flat ventral side; convex dorsal side has limy plates (overlap 8) - cling to rocks flat central foot (camo) - stay-at-home; when feeding - feed on algae with radula - can ball up like armadillo for protection - gills/3 chamber heart - sensory organs: shell eyes and osphradia |
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Osphradia
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Chemosensory organs for sampling water
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Univalve Shell
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One coiled piece, found in Gastropoda
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Operculum
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Plate that covers shell opening when body is inside shell, Gastropoda
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Torsion
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Twisting in Gastropoda that occurs in larval stage only, anus becomes anterior above mouth
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Fouling
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Contamination of feeding or respiratory areas in Gastropoda
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Class Bivalvia
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Two halves/parts
Plecypoda (hatchet foot) 2 shelled Mollusks that are hinges No radula or head Large foot for burrowing in sand or mud Scallop shells clap together for movement Ex: scallops, clams, shipworms, oysters, muscles |
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Cephalopoda
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Means head foot
Most complex of all Mollusks Tentacles with large eyes All marine/active predators Chromatophores |
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Loligo
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Common squid
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Humboldt
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Jumbo squid 6ft, diablo rojo or white
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Architeuthis dux
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Giant squid, 18m, fights with sperm whale
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Mesonychoteuthis hamiltoni
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Collpssal squid, wide,
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Octopus
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Rounded body with 8 tentacles
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Squid
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Streamline body 10 tentacles
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Blue ringed Octopus
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Size of golf all, cute, venomous, injects with beak
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Nautilus
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Pretty with big shell
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Saint Augustine Giant
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200 ft wide circle
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Sepia officinalis
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Cuttlefish, king of camo
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