Chordate Review

A comprehensive set of vocabulary flashcards covering key concepts about chordates, their characteristics, evolution, and ecological relationships.

Deuterostomes

Organisms where the first opening in the blastula becomes the anus.

Protostomes

Organisms where the first opening in the blastula becomes the mouth.

Chordates

A subphylum of animals that include vertebrates and are characterized by having a notochord.

Phylum Echinodermata

A phylum that includes starfish, brittle stars, sea cucumbers, and sea urchins, characterized by a spiny skin.

Notochord

A cartilaginous support rod along the back of chordates.

Dorsal hollow nerve cord

A structure that develops into the spinal cord in chordates.

Pharyngeal slits or pouches

Structures that develop into gill slits in fish and parts of the throat and ear in humans.

Post-anal tail

A tail that extends beyond the anus; characteristic of chordates.

Subphylum Cephalochordata

Includes lancelets and represents the basal chordate group.

Subphylum Tunicata

Includes tunicates and sea squirts; adult forms may not resemble chordates.

Subphylum Vertebrata

Includes vertebrates where vertebrae replace the notochord in most groups.

Class Agnatha

Jawless vertebrates that include lampreys and hagfish.

Class Chondrichthyes

Cartilaginous fishes such as sharks and rays, known for their flexible skeletons.

Class Osteichthyes

Bony fishes characterized by a heavy bony skeleton and swim bladders.

Class Amphibia

Amphibians such as frogs and salamanders, which usually require water for reproduction.

Amniote

A clade that includes reptiles, birds, and mammals, characterized by an amniotic egg.

Class Aves

Birds, often referred to as feathered dinosaurs.

Monotremes

Egg-laying mammals, such as the platypus and spiny echidna.

Marsupials

Mammals that give birth to underdeveloped young, which then develop in a pouch.

Placental Mammals

Mammals that nourish their young through a placenta before birth.

Lancelets

Small fish-like chordates belonging to the subphylum Cephalochordata.

Tunicates

Marine animals that belong to subphylum Tunicata; adult forms resemble sponges.

Cartilaginous skeleton

A type of skeleton made of cartilage rather than bone, found in Chondrichthyes.

Swim bladder

A gas-filled organ that helps bony fish maintain buoyancy.

Cutaneous breathing

Breathing through the skin, common in amphibians.

Amniotic egg

An egg that has a protective amniotic membrane; crucial for land animals.

Dimetrodon

A prehistoric synapsid often confused with dinosaurs.

Archaeopteryx

An ancient fossil considered the first bird, showcasing features of both birds and dinosaurs.

Lungfish

A type of fish that has a modified swim bladder used for breathing air.

Chytrid fungus

A pathogen causing a global pandemic among amphibians.

Cretaceous extinction

A mass extinction event that led to the diversification of mammals.

Fur

A characteristic feature of mammals that helps with insulation.

Mammary glands

Glands that produce milk in mammals for feeding their young.

Cerebral cortex

The part of the brain that is enlarged in mammals, linked to higher learning.

Internal fertilization

A reproductive strategy where fertilization occurs inside the female's body.

External fertilization

A reproductive strategy where eggs are fertilized outside the female's body.

Vivipary

A form of reproduction where live young are born.

Ovipary

A reproductive method involving laying eggs.

Ovovivipary

A reproductive strategy where eggs hatch within the female's body.

Rodents

A diverse group of placental mammals typically characterized by continuously growing incisors.

Xenarthra

An eclectic group of placental mammals including armadillos and sloths.

Tetrapods

Four-limbed vertebrates, which include amphibians, reptiles, birds, and mammals.

Evolutionary transition

The process through which different species evolve into new forms, as shown in the fossil record.

Holotype

The single type specimen upon which the description and name of a new species is based.

Extinction

The dying out of a species or group of species.

Ecological niche

The role and function of an organism within its ecosystem.

Phylogenetic tree

A diagram that represents evolutionary relationships among species.

Vestigial structures

Body parts that have lost their original function through evolution.

Natural selection

The process where organisms better adapted to their environment tend to survive and produce more offspring.

Adaptive radiation

The diversification of a group of organisms into forms filling different ecological niches.

Sympatric speciation

The evolution of new species from a single ancestral species while inhabiting the same geographic region.

Allopatric speciation

The evolution of new species through the process of geographic isolation.

Convergent evolution

The independent evolution of similar features in species of different lineages.

Analogous structures

Body parts that share a common function but not structure, often resulting from convergent evolution.

Homologous structures

Anatomical similarities between species that indicate a common ancestry.

Genetic drift

Random changes in allele frequencies in a population.

Gene flow

The transfer of genetic variation between populations.

Founder effect

A loss of genetic diversity that occurs when a new population is established by a small number of individuals.

Biodiversity

The variety of life in the world or in a particular habitat or ecosystem.

Ecosystem

A biological community of interacting organisms and their physical environment.

Biosphere

The global sum of all ecosystems; the zone of life on Earth.

Decomposers

Organisms that break down dead organic material, returning nutrients to the ecosystem.

Food chain

A linear sequence of organisms through which nutrients and energy pass.

Trophic levels

The different levels in a food chain or food web, representing the flow of energy.

Biogeochemical cycles

The cycles of chemical elements and compounds between living organisms and the physical environment.

Carbon cycle

The series of processes by which carbon compounds are interconverted in the environment.

Nitrogen cycle

The series of processes by which nitrogen and its compounds are interconverted in the environment.

Phosphorus cycle

The movement of phosphorus through the lithosphere, hydrosphere, and biosphere.

Primary production

The creation of organic compounds by producers in an ecosystem.

Climate change

Long-term alteration of temperature and typical weather patterns in a place.

Carbon footprint

The total amount of greenhouse gases produced to directly and indirectly support human activities.

Sustainable development

Development that meets the needs of the present without compromising the ability of future generations to meet their own needs.

Ecosystem services

The benefits people obtain from ecosystems.

Conservation biology

The study of the preservation, protection, and restoration of biodiversity.

Endangered species

A species at risk of extinction due to loss of habitat, changes in climate, or other factors.

Invasive species

Non-native species that spread widely and cause harm to the environment, economy, or human health.

Ecological restoration

The process of assisting the recovery of an ecosystem that has been degraded.

Wildlife management

The practice of maintaining and restoring wildlife populations and their habitats.

Genetic conservation

Preserving the genetic diversity of species to ensure their survival.

Extirpation

The local extinction of a species from a specific area.

Habitat fragmentation

The process of dividing ecosystems into smaller pieces, which can threaten species survival.

Habitat destruction

The process in which natural habitat is rendered unable to support the species present.

Pollution

The introduction of harmful substances into the environment.

Gentrification

The process of renovating and improving a house or district so that it conforms to Middle-Class taste.

Pollinator decline

The decrease in populations of pollinators, which are essential for plant reproduction.

Greenhouse gases

Gases that trap heat in the atmosphere, contributing to climate change.

Ozone depletion

The thinning of the ozone layer due to human activity, leading to increased UV radiation.

Renewable energy

Energy from sources that are naturally replenished, such as solar or wind energy.

Fossil fuels

Natural substances formed from decomposed organic materials, such as coal and oil.

Carbon neutrality

Achieving a balance between emitting carbon and absorbing carbon from the atmosphere.

Ecosystem resilience

The capacity of an ecosystem to respond to disturbances and return to its original state.

Environmental stewardship

The responsible management of resource use and conservation.

Zero waste

An approach to waste management that aims to eliminate waste entirely.

Sustainable agriculture

Farming that meets current food needs without compromising future generations' ability to do the same.

Agroecology

An approach of farming that applies ecological principles to agricultural practices.

Permaculture

A system of agricultural and social design principles centered around simulating natural ecosystems.

Organic farming

A method of farming that uses natural processes without synthetic chemicals.

Food security

The state of having reliable access to a sufficient quantity of affordable, nutritious food.

Biodynamic farming

A holistic approach to farming that emphasizes the interrelationship between soil, plants, animals, and humans.

Aquaculture

The cultivation of aquatic organisms in controlled environments.