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    Mollusc A

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    Karsah Mintarsih
    The document summarizes the key characteristics of the phylum Mollusca. It includes the following main points: 1. Molluscs are triploblastic protostomes that may or may not have a shell called a mantle. The mantle is used for respiration via gills or lungs and contains a diagnostic rasp called a radula. 2. The main classes of molluscs are Aplacophora, Monoplacophora, Polyplacophora, Gastropoda, Scaphopoda, Bivalvia, and Cephalopoda. 3. Cephalopods like squid and octopus have closed circulatory systems, tentacles with

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    Mollusc A

    Uploaded by

    Karsah Mintarsih
    91 views29 pages
    The document summarizes the key characteristics of the phylum Mollusca. It includes the following main points: 1. Molluscs are triploblastic protostomes that may or may not have a shell called a mantle. The mantle is used for respiration via gills or lungs and contains a diagnostic rasp called a radula. 2. The main classes of molluscs are Aplacophora, Monoplacophora, Polyplacophora, Gastropoda, Scaphopoda, Bivalvia, and Cephalopoda. 3. Cephalopods like squid and octopus have closed circulatory systems, tentacles with

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    The document summarizes the key characteristics of the phylum Mollusca. It includes the following main points: 1. Molluscs are triploblastic protostomes that may or may not have a shell called a mantle. The mantle is used for respiration via gills or lungs and contains a diagnostic rasp called a radula. 2. The main classes of molluscs are Aplacophora, Monoplacophora, Polyplacophora, Gastropoda, Scaphopoda, Bivalvia, and Cephalopoda. 3. Cephalopods like squid and octopus have closed circulatory systems, tentacles with

    Copyright:

    Attribution Non-Commercial (BY-NC)
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    91 views29 pages

    Mollusc A

    Uploaded by

    Karsah Mintarsih
    The document summarizes the key characteristics of the phylum Mollusca. It includes the following main points: 1. Molluscs are triploblastic protostomes that may or may not have a shell called a mantle. The mantle is used for respiration via gills or lungs and contains a diagnostic rasp called a radula. 2. The main classes of molluscs are Aplacophora, Monoplacophora, Polyplacophora, Gastropoda, Scaphopoda, Bivalvia, and Cephalopoda. 3. Cephalopods like squid and octopus have closed circulatory systems, tentacles with

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    Mollusca

    Triploblastic Protostomes Mantle: may or may not make a shell Mantle respires (gills or lung). Radula: diagnostic rasp when there Open circulation in most classes

    Cladogram of the Mollusca

    Mantle, Foot, Visceral mass


    Chitons Octopi, squids

    Snails, slugs

    Clams, oysters, mussels

    The Mollusks
    Mostly marine Few in fresh water Fewer on land

    Phylum Mollusca
    Class Aplacophora Class Monoplacophora Class Polyplacophora Class Gastropoda Class Scaphopoda Class Cephalopoda Class Bivalvia (Pelycepoda)

    Monoplacophora

    Segmental gills: annelid kinship?

    Bivalvia

    No radula Filter-feeders Sinkers of ships

    Geoduck

    gooey duck? good digger

    Fig. 12.16c

    Filter-Feeding

    Wheel Anticipated
    Spinning style rubs against gastric shield. Log-rolling cilia precedes lathe design. Enzyme crystals

    Bivalve Digestion

    Diverticular Digestive Gland Not like yours at all

    Clam Anat

    Parasitic Clam Larvae

    Ostra
    Ostra: (Greek for oyster, shell, shard) Ostra: Banning ballot (no jail time) Ostracize: banishment decided by writing name of evil-doers on shards of pottery and depositing them in a ballot box.

    Gastropods
    Slugs, snails, limpets, abalone and periwinkles, ugly, plain & beautiful Herbivores Carnivores Scavengers

    Snails, conchs, limpets


    One shell +/- an operculum Mantle and shell spiral outward Nacre, prismatic layer, periostracum

    Radula

    Rad, man! Texas Radula Massacre

    Terrestrial Pulmonate

    Snail Anatomy

    Class Cephalopoda
    Closed Circulatory System 3 hearts (2 branchial, 1 systemic) Tentacles, most with suckers Chromatophores Stinging radula & beak (parrot-like) Drama queens & masters of disguise

    Squid Anat

    Three hearts How many you?

    Eyeball
    Retinas done right? And yours?

    Blue-Ringed Octopus
    Small Bright Lethal

    Chambered Nautilus

    Siphonoglyph

    Gas-secreting organ Adjusts buoyancy Saves swimming effort

    Coiling
    Nautilus coiling is conned to one plane. Snail coiling skews toward one side. The shell ops to one side. Organs on that side are compressed even reduced.

    Torsion

    Repositions anus

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