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adductor muscle scar
Region on interior of bivalve shell where the muscles attach to hold shell closed
Protein threads secreted by glands in the foot of bivalves; holds animal to substrate
Flagellated cell lining interior canals of sponges; creates currents; captures particles in collar of microvilli held together by mucus; responsible for intracellular digestion and meiosis
Body cavity formed within mesoderm; created by layer of epithelium called the peritoneum; holds organs in place
Ciliated "wheels" at anterior of rotifers; used for movement of water to capture suspended organic particles, such as bacteria, for feeding
Gill in molluscs; consists of an axis that holds layers of thin, vascularized sheets of tissue (has comb-like appearance, hence the name); also used for feeding in bivalves
Development from embryos that have two layers of cells, the endoderm and ectoderm; adult organism has epidermis and gastrodermis (Cnidaria and Ctenophora are diploblastic)
Development in which all adults have the same, fixed number of cells (rotifers, nematodes, tardigrades)
Protonephridia found in flatworms, nemerteans, rotifers; ciliated "flame cell" pulls water from the coelom into a canal system for excretion; appears to function mostly for osmoregulation rather than excretion of wastes; Annelida have similar structure, but flame cell is flagellated (called a solenocyte)
Fluid filled cavity in Cnidaria (Ctenophores?)and Flatworms; serves for digestion and for hydroskeleton
Annelid body type in which segments in different regions are specialize for certain functions
Support structure in cnidarians and flatworms based on a fluid filled cavity surrounded by muscles that can put pressure on the cavity to stiffen and contract the animal; or release pressure to soften and extend the animal
Extensions of tissue near the mouth of bivalves; selects appropriate particles to consume and creates pseudofeces of rejected particles
Characteristic of molluscs; fold of epidermis that covers the vis the visceral mass and forms a cavity in which the ctenidia, anus, nephridiopore and gonopore are located; mantle secretes the shell and forms siphons, tentacles, and other structures
Cavity in molluscs formed by the mantle; ctenidia lie in cavity and anus, gonopore, and nephridiopore open into cavity
Non-cellular layer of "jelly" and fibers between the epidermis and gastrodermis in cnidarian
Non-cellular material in the wall of a sponge; contains spicules, amoebocytes; lies between the choanocyte layer and the pinacocyte layer
Structure in Annelids that serves for both excretion of wastes from mesonephridia to the outside of the body, as well as for transport of gametes
Organelle in cnidocytes of Cnidaria; when triggered by touch, shoots out a harpoon like hook with poisons, attached by a thread of protein; used to subdue prey and for defense
Sensory structure in bivalves; water flows that enters siphon flows first across this organ, which has chemosensors; enables siphon to "sniff out" directions in which food or mates might be found
Simple kidney-like structures that serve as osmoregulatory and (in some) waste removal in flatworms, nematodes, nemerteans, and annelids)
Bolus of particles rejected by bivalve labial palps, bound up in mucus, and expelled into the mantle cavity
Specialization of mantle for directing incurrent and excurrent water flow through body cavity in bivalves
Individual produces either eggs or sperm; includes members of phyla: nematodes, rotifers, annelids, molluscs, and tardigrades
Individual produces eggs and sperm (serial hermaphrodite produces eggs and sperm but not at the same time); includes members of phyla: sponges, cnidarian, ctenophores, flatworms, annelida
Larval type characterized by an anterior tuft of cilia and a band of cilia; found in annelids and molluscs
Animals that have a body cavity that is not derived from mesoderm; the cavity usually contains proteins, fibers, non-cellular material, and organs; nematodes, nemerteans, and rotifers
Organisms that have a body cavity derived from mesoderm; include annelids and molluscs and other "higher" animals
Ability to reproduce via mitotically derived cells; common in sponges, cnidarian, Platyhelminthes, nemerteans, and annelida,
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