Term
| Where does the radula lie and what supports it? |
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Definition
| on the floor of the buccal cavity, the odontophore (connective tissue) |
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Term
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Definition
| in molluscs, it is an organ typically used for attachment or locomotory function |
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Definition
two folds of skin on each side of the body,
May secrete a protective shell over the visceral mass |
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Term
| What houses the lung in a mollusc? |
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Definition
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Definition
| a long flattened central axis attached to the mantle along one edge, has leaf-like filaments projecting from opposite sides of the axis |
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Definition
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Definition
| outer organic layer, contains conchiolin to protect from boring organisms |
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Definition
| middle layer, made of calcium carbonate |
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Definition
| laid down continually and thickens thoughout the life, it is mother of pearl color and responsible for the production of pearls |
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Term
what is the larva of molluscs called?
what is the intermediate larva stage called? |
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Definition
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Term
| What is the shell of a chiton like? |
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Definition
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Term
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Definition
| in chitons, they are photosensitive structures that pierce the plates |
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Term
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Definition
| in gastropods, the smallest and oldest whorl |
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Term
| what does whorls spiral around in gastropods? |
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Definition
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Term
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Definition
| during the veliger larva stage |
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Term
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Definition
occuring during the veliger larva stage
it is 180 degree counterclockwise twisting of the visceral mass, mantale and mantle cavity
- this opens a space for the head to be withdrawn into the shell
But the direction of travel allows waste to wash back over the gills (fouling) |
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Term
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Definition
| in gastropods, all whorls in a single plane, primitive state |
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Term
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Definition
in gastropods, more compact, whorls are to the side of adjacent ones
- have to lift the shell upward and back to balance weight distribution
- results in loss of the right gill, auricle and kidney but it is a solution tot he problem of fouling (they expel waste to the right) |
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Term
| what is a solution to fouling? |
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Definition
| coiling , particularly conispiral coiling, in which the shell opens to one side and the wastes are expelled to the right |
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Term
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Definition
| in gastropods, it is an opening to the outside from the vascular area (serving as a lung) in pulmonates |
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Term
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Definition
| in cephalopods, it connects the chambers of the visceral mass |
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Term
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Definition
| in caquid, it is a thin strip that acts as the shell |
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Term
| Explain circulation in cephalopods |
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Definition
| they have acessory or branchial hearts at the base of each gill to increase pressure to blood going through gill capillaries |
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Term
| What class has the largest invertebrate brain? |
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Definition
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Definition
| it plucks a spermatophore from the mantle cavity and inserts it into the female in cephalopods |
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Definition
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Definition
| the rounded or pointed extremity of a bivalve shell at which it began to grow (the oldest part of the shell) |
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Term
| Explain feeding in bivalves |
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Definition
-Suspended organic matter enters the incurrent siphon
- Mucus entangles desirable particles, others drop off the gills
- Food in mucous masses slides to food groves at the lower edge of the gills
- Cilia and grooves on the labial palps direct the mucous mass into the mouth |
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Term
| explain digestion in bivalves |
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Definition
- the mucous food mass is spun through a style sac
- particles are sorted, and suitable ones get directed to a digestive gland or are engulfed by amoebocytes (others go to the intestine) |
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Term
| What is the coelom called in bivalves |
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Definition
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