2/3/20 Flashcards
ways Cnidaria can reproduce
sexually or asexually
Cnidarian Classes who have both medusa and polyp life stages
Scyphozoa, Cubozoa, and Hydrozoa
Cnidarian Class that only has a polyp life stage (no medusa)
Anthozoa
known as “box jellies”
Class Cubozoa
mating system of Cubozoa
males actively transfer sperm to females
characteristics of Cubozoa
very deadly, active swimming hunters, have “eyes” (but no CNS)
known as “true jellies”
Class Scyphozoa
characteristics of Scyphozoa
200 known species, most are small, can be predators or filter feeders, tetraradial symmetry, males and females not dimorphic, long tentacles and ribbon-like oral arms for feeding
colonial animals within Cnidaria
Class Hydrozoa
characteristics of Hydrozoa
3600 known species, high morphological diversity, mostly colonial
individuals of a Hydrozoan colony
zooids
contains anemones and corals
Class Anthozoa
characteristics of Anthozoa
6000 known species, hexamerous/octamerous symmetry,, no medusa stage, complex gastrovascular cavity
characteristics of coral
colonial, made of many polyps that create an exoskeleton from calcium and carbonate in the water, contain symbiotic dinoflagellate algae, bleach algae when stressed
potential ancestor to all triploblasts
Phylum Xenacoelomorpha
characteristics of Xenacoelomorpha
small marine flatworms, 400 known species, simple morphology, blind gut, no complex organ systems or CNS
characteristics of Phylum Lophotrochazoa
spiral cleavage
important phyla within Platyzoa (which is within Lophotrochazoa)
Platyhelminthes, Rotifera, and Acanthocephala
characteristics shared by Rotifera and Acanthocephala
complex nervous system (brains!), digestive system, excretory system, no circulatory or respiratory systems
characteristics of Rotifera
2200 species, globally distrubuted, mostly freshwater, ciliated corona, advanced morphology, both sexual and parthenogenetic reproduction
parthenogenetic reproduction
when females produce fertilized eggs by themselves
how the “mouth” of Rotifera works
cilia surrounding corona beat to draw in food, which is then “chewed” by the mastax
characteristics of Acanthocephala
thorny-headed worms, may be a type of Rotifera, 1100 species, all are parasitic, probiscus surrounding head, lives in intestine, globally distributed, sexually dimorphic, no digestive system
general life cycle of Acanthocephala
breed inside of host, eggs are released into water and attach to algae, intermediate host eats algae and egg develops inside, definitive host eats intermediate host where Acanthocephala lives out its life
