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Definition
| soft and unsegmented. anterior head, ventral foot, dorsal visceral mass, mantle secretes shell of CaCO3 in organic matrix |
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Definition
-->Periostracum(organic)___outer___
......................prismatic layer CaCO3
-->Nacreous layer_____Inner_______ |
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Definition
| mantle cavity: infolding of mantle; houses ctenidia (gills) |
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Definition
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Term
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Definition
| complete; often coiled or U-shaped; mouth encloses buccal mass(radula, adontophore, musculature);stomach(contains crystelline style);digestive gland(diverticulum);inestine->rectum->anus opens into mantle cavity |
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Term
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Definition
open (except in cephalopods)
blood->aorta->hemocoel->veins->gills->heart->begin |
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Term
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Definition
| gills; mantle cavity; epidermis |
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Term
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Definition
| wastes->pericardium->metanephridia(funnel shaped, nephrostome, nephridopore) -> mantle cavity |
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Term
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Definition
| Nerve ring(longitudinal nerve cords(pairs));cephalopods:complex brain |
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Term
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Definition
| eyespots/eyes(photo receptors); chemo receptors(osphradia); stacysts(balance); mechano receptors |
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Term
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Definition
| usually gonochorisitc; some hermaphroditic(simultaneous sequential-Protandrous(first males, then turn into females)(slipper shells). Fert. external or internal w/copulation |
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Term
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Definition
indirect w/ free swimming larvae:
fert egg->embryo->trochophore larva(planktotrophic)->Veliger larva (planktotropic);;;in FW bivales: glochidium; direct/mixed devol. |
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