Biology Lecture on Protosomes and Related Groups

This set of flashcards covers key vocabulary and concepts from the biology lecture on Protosomes, their body plans, and various groups within these classifications.

Ectisoa

A group of organisms that grow by molting and includes nematodes, onychophorans, tardigrades, and arthropods.

Hydrostatic Skeleton

A fluid-filled body cavity that provides structural support, allowing movement by changing the pressure of the fluid.

Chitin

A tough, flexible polysaccharide that makes up the exoskeleton of arthropods.

Parthenogenesis

A form of asexual reproduction in which an egg develops without fertilization, producing a genetically identical offspring.

Protosomes

Organisms characterized by spiral cleavage during development, where the mouth forms before the anus.

Hemocoel

A blood-filled body cavity in organisms where the organs are bathed in fluid, facilitating the movement of nutrients and gases.

Gastropods

A class of mollusks characterized by a single shell or no shell at all, such as snails and slugs.

Bivalves

Mollusks with two hinged shells, such as clams and scallops, that are typically suspension feeders.

Nematodes

Roundworms that are smooth-bodied and have a pseudocoelom, and many are important in studies of development.

Cephalopods

Highly intelligent mollusks such as octopuses and squids, known for their complex behaviors and abilities.

Myriapods

A subphylum of arthropods that includes centipedes and millipedes, characterized by many body segments and numerous legs.

Metamorphosis

A developmental process in insects where they undergo significant changes from juvenile to adult form, either through incomplete or complete metamorphosis.

Corona

A structure found in rotifers that is used for feeding and locomotion.

Ectoderm

The outer layer of cells in the developing embryo that will form the skin and nervous system.

Trochophore larvae

A free-swimming larval stage found in some protostomes, particularly in marine annelids and mollusks.

Coral Reefs

Underwater structures made from calcium carbonate secreted by corals, hosting a diverse range of marine life.