Lophotrochozoans and Tissues

This set of flashcards covers key vocabulary and concepts related to Lophotrochozoans and foundational topics in animal biology.

Basal animal example

A sponge, which has an asymmetrical body plan.

Gastrulation

The process that describes the development from a blastula to a gastrula.

Tonicity

The ability of a solution to alter the shape or volume of cells by affecting osmotic pressure.

Isotonic solution

A solution where the cell’s salt concentration matches its environment's salt concentration.

Hypertonic solution

A solution where water leaves the cell, causing it to shrivel due to higher salt concentration outside.

Hypotonic solution

A solution where water rushes into the cell, causing it to swell or burst due to lower salt concentration outside.

Osmoregulation

The process by which species maintain internal ion concentration relative to their external environment.

Diploblastic

Organisms with two embryonic tissue layers: ectoderm and endoderm.

Triploblastic

Organisms with three embryonic tissue layers: ectoderm, endoderm, and mesoderm.

Acoelomate

An organism that lacks a body cavity.

Pseudocoelomate

An organism with a 'false' body cavity that is not fully lined by mesoderm.

Coelomate

An organism with a true body cavity, fully lined with mesoderm derived tissues.

Lophophore

A crown of ciliated tentacles used in feeding, characteristic of some Lophotrochozoans.

Trochophore larval stage

A type of larval stage found in some lophotrochozoan phyla, characterized by ciliated bands.

Ectoprocts (bryozoans)

Colonial organisms with a lophophore for suspension feeding, displaying bilateral symmetry.

Rotifers

Pseudocoelomate organisms found in aquatic environments with a ciliated crown called the corona.

Platyhelminthes

Flatworms that are acoelomate, many of which are parasitic and absorb nutrients through their body.

Annelids

Segmented worms that are coelomates, with various feeding mechanisms and most being hermaphrodites.

Mollusks

Coelomate organisms with bilateral symmetry, including a mantle, muscular foot, and most having a radula.