Systematic Zoology and Animal Classification Vocabulary

Flashcards covering the taxonomy, body plans, larval stages, anatomical features, and major groups defined in the lecture notes on animal classification.

Porifera

Sponges; a phylum of simple, aquatic multicellular animals including species such as Spongilla lacustris (freshwater sponge) and Euspongia officinalis (bath sponge).

Cnidaria

A phylum of aquatic animals characterized by specialized stinging cells (cnidocytes), including Anthozoa (corals), Actiniaria (sea anemones), Hydra sp. (hydra), Rhizostomeae, Semaeostomeae, and Cubozoa (box jellyfish).

Schizocoel

A body cavity type formed by the splitting of mesodermal tissue masses, characteristic of Platyhelminthes (flatworms).

Platyhelminthes

A phylum of dorsoventrally flattened unsegmented worms with a schizocoel body cavity, including planarians (Dendrocoelum lacteum), flukes (Fasciola hepatica, Dicrocoelium dendriticum, Fascioloides magna), Monogenea, and tapeworms.

Scolex

The specialized anterior attachment head of a tapeworm (e.g., in Dyphyllobothriidea and Cyclophyllidea) equipped with hooks or suckers to anchor itself to the host's intestinal lining.

Proglottid

An individual segment of a tapeworm body containing independent reproductive organs, which matures and detaches as it fills with eggs.

Trochophore

A free-swimming, spherical or pear-shaped larval stage surrounded by cilia, characteristic of mollusks and annelids.

Veliger

The planktonic larval stage of many mollusks that develops from a trochophore, possessing a shell and a ciliated velum for swimming and feeding.

Glochidium

A specialized microscopic parasitic larval stage of freshwater bivalve mussels that attaches to the gills or fins of fish to complete development.

Mollusca

A large phylum of soft-bodied invertebrate animals typically divided into head, foot, and visceral mass, including gastropods (snails, slugs), bivalves (mussels, clams), and cephalopods (squid, octopus, Nautilus sp.).

Coelom

A fluid-filled secondary body cavity completely lined by tissue derived from mesoderm, characteristic of Annelida and higher bilaterian animals.

Annelida

A phylum of segmented worms possessing a true coelom, including polychaetes (Nereis sp.), oligochaetes (Tubifex sp., Lumbricinae), and leeches (Hirudo medicinalis, Haemopis sanguisuga, Piscicola sp.).

Pseudocoel

A persistent blastocoel-derived body cavity fluid-filled space between the endoderm and mesoderm that is not completely lined with mesodermal peritoneum, characteristic of Nematoda.

Nematoda

A phylum of unsegmented roundworms possessing a pseudocoel body cavity and a tough cuticle, including free-living species (Caenorhabditis elegans) and parasitic species (Trichuris sp., Trichinella sp., Ascaris lumbricoides, Dirofilaria immitis).

Acanthocephala

A phylum of parasitic spiny-headed worms characterized by an eversible proboscis armed with curved spines used to anchor into the intestinal wall of their hosts.

Euchelicerata

A subphylum/group of arthropods bearing chelicerae as primary mouthparts, encompassing arachnids such as harvestmen (Opilio parietinus), scorpions (Scorpionida), ticks (Ixodes ricinus), mites (Varroa destructor, Sarcoptes scabiei), and spiders.

Crustacea

A group of predominantly aquatic arthropods characterized by biramous limbs and two pairs of antennae, including fairy shrimp (Anostraca), water fleas (Cladocera), copepods (Cyclopoida), isopods, and decapods (crayfish, lobsters, crabs).

Myriapoda

A subphylum of terrestrial arthropods with elongated bodies composed of numerous segments and many legs, encompassing millipedes (e.g., Julus terrestris) and centipedes (e.g., Lithobius forficatus).

Hexapoda

A subphylum of arthropods characterized by a body divided into head, thorax, and abdomen, bearing three pairs of legs, including entognaths (springtails) and true insects.

Chordata

A phylum of animals defined by having a notochord, dorsal hollow nerve cord, pharyngeal slits, and a post-anal tail at some point in development, encompassing jawless fish, ray-finned fish, amphibians, reptiles, birds, and mammals.

Cephalaspidomorphi

A class of jawless aquatic vertebrates comprising lampreys (Lampetra sp.).

Actinopterygii

The class of ray-finned bony fishes, comprising the vast majority of living fish species such as sturgeons (Acipenseriformes), eels (Anguilla anguilla), cyprinids (Cyprinus carpio), salmonids (Salmo salar), catfish, and perches.

Lissamphibia

The evolutionary subclass of modern amphibians, including urodeles (salamanders, newts, axolotls) and anurans (fire-bellied toads, spadefoot toads, true toads, tree frogs, true frogs).

Aves

The class of endothermic, feathered, egg-laying vertebrate animals commonly known as birds, including waterfowl, raptors, gamebirds, shorebirds, owls, woodpeckers, and passerines.

Mammalia

A class of endothermic vertebrate animals defined by the presence of mammary glands that produce milk, hair or fur, and three middle ear bones.