Invert Book Chapter (Cnidaria)

Phylum Cnidaria Classification: – Introduction provided by: Jessica Comeau Cnidarians are organisms found exclusively in aquatic habitats. Of the over 10,000 aquatic Cnidarian species discovered, most inhabit marine environments. All species are diploblastic organisms that have radial symmetry which can exhibit itself in two major body forms, polyp or medusae. Although the structure of various […]

Class notes (Cnidaria)

Hydrozoans, jellies, sea anemones, coral polyps Cnidarian characteristics Radially symmetric Diploblastic (epidermis, gastrodermis) No cephalization, no central nervous system No special respiratory, excretory or circulatory organs Primarily carnivores Polyp (sessile) and medusa (pelagic) body forms Have no separate gut and only one body opening. This has several consequences: Food and undigested waste pass through same […]

Class notes (Proifera)

About 8,000 species, mostly marine Sponge features: No organ system Most are asymmetrical Have highly specialized cells Many sponge cells are totipotent; can differentiate into many different cell types cells can be dissociated, separated, and then they will reaggregate   Proifera diversity Class Calcarea Class Demospongiae Class Hextactinellida   Sponge reproduction Asexual – buds breaking […]

Class notes (Protists)

The domain Eukarya consists mostly of protists Each of the 7 major groups of Eukarya contain protists Amoebozoa Opisthokonta Excavata Plantae Rhizaria Aveolata Stramenopila Contractile vacuoles – expel water from the cell Protist patterns of nutrition Autotrophic (algae, plant-like) – capable of synthesizing own food Heterotrophic – feeds from other organisms ingestors (protozoa, animal-like) absorbers […]