Radiate Animals - PBworks

Radiate Animals - PBworks

Radiate Animals Cnidarians and Ctenophores Radiates Are Eumetazoans E u m e ta zo a

T r u e T is s u e s G r a d e R a d ia t a R a d ia l S y m e t r y P h y lu m C n id a r ia

H y d r a , je lly f is h e t c ... G r a d e B ila t e r a t a B ila t e r a l S y m e t r y P h y lu m

C te n o p h o ra C o m b je llie s D iv is io n P r o t o s t o m ia

D iv is io n D e u t e r o s t o m ia Radiates Radial symmetry Tissue level organization

Two germ layers Ectoderm and endoderm Nerve net (simple nervous system) Extracellular digestion

Radiate Phyla Cnidaria Ctenophore

Phylum Cnidaria Two forms Polyp Medusa

Tentacles Nematocyst Polyp and Medusa Forms

Class Hydrozoa

Mostly colonial Polyp and medusa life cycle for most Hydra non colonial polyp stage only

Obelia typical colony Chiton exoskeleton Extracellular and intercellular digestion Hydra

Hydra Tissue Structure Obelia Life Cycle

Gonionemus Class Scyphozoa

Larger jellyfish Not colonial

No vellum Internal gastric pouches Radial canals lead to ring canal Aurelia Life Cycle

Medusa Strobilia

Class Anthozoa Subclasses Zoantharia anemones, hard coral Alcyonaria sea fans (soft coral) Ceriantipatheria tube anemone, horny coral

Polyp form, no medusa stage Partitioned gastrovascular cavity Sea Anemone

Sea Anemone Anemone Fish (Clown Fish)

Zoantharian Coral Calcium carbonate exoskeleton secreted externally from base

Contain mutualistic zooxanthallae algae Live in colonies Hexamerous symmetry

Coral Polyps Alcyonarian Coral Octomerous

symmetry Colonial Can communicate with members of colony through

tubes call solenia Endoskeleton composed of spicules and protein and secreted within

mesoglea Soft Corals Phylum Ctenophora

Comb Jellies Move using cilia Comb plates Do not have nematocysts

Colloblasts capture food Comb Jelly Tentacle Comb Jelly Structure

Comb Jelly Cilia Predatory Comb Jellies Approaching Prey

Predatory Comb Jelly Engulfing a Comb Jelly Comb Jelly After a Meal

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