Marine Biology: Worms and Mollusks Vocabulary
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Created by:
matttice2845 on April 25, 2012
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25 terms
Terms | Definitions |
|---|---|
 Platyhelminthes | Phylum that contains flatworms; bilaterally symmetrical, central nervous system present, three cell layers |
| Pharynx | Tube-like muscular organ that releases enzymes to begin digestion |
| Eyespot | light-sensitive receptor cells that perceive available light conditions |
| Scolex | Knob-shaped structure at anterior end, with hooks & suckers that attach to intestinal lining |
| Nemertea | Phylum that contains ribbon worms; all are predators, have one-way digestive system and circulatory system |
| Proboscis | Long fleshy tube used to catch prey |
| Nematoda | Phylum that contains round worms; bilaterally symmetrical, pseudocoelomate, no reproductive or circulatory organs |
| Rotifera | Phylum that contains rotiers; pseudocoelomates, bilaterally symmetrical, one-way digestive system and very tiny |
| Sipuncula | Phylum that contains peanut worms; soft, unsegmented bodies; live in marine habitats and can pull a portion of their body into themselves |
| Mollusca | Phylum that contains mollusks; have complete digestive glands, stomachs, and intestines and are unsegmented, soft-bodied invertebrates |
| Mantle | A protective layer of epidermis in mollusks or brachiopods that secretes a substance forming the shell |
| Radula | an organ covered with teeth that mollusks use to scrape food into their mouths |
| Ctenidia | Large gills where the nutrients are absorbed and the wastes are removed |
| Valve | External or internal shells in a mollusk |
| Palps | organ that moves mucus covered food from the cilia to the mouth |
| Umbo | oldest part of the shell of a bivalve from which the shell grows |
| Hinge Ligament | holds the two valves together |
| Adductor Muscles | muscles of a bivalve that keep the shell tightly closed |
| Byssal Threads | used to attach mussels to each other or a rocky surface |
| Operculum | Calcareous "trap-door" used to seal the shell; thwarts predators and keeps animal from desiccation if stranded |
| Pen | An internal valve in squid and cuttlefish |
| Annelida | Phylum that contains annelids; bilaterally symmetrical, coelomates, one-way digestive system and are segmented |
| Gizzard | Muscular sac containing hard particles to grind soil & food |
| Setae | Tiny sharp bristles on segments that push into soil & anchor worm during movement |
| Parapodia | Appendages for swimming/crawling |
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