Biology lecture 4/20/15Animal diversity1. Animal classification continued2. Porifera: sponges3. Radiata- Phylum cnidaria- Phylum ctenoporaOpinions based on morphology, anatomy, and development2 main groups of animals1. Radiata2. Bilateriaa. Deuterostomoas developmentb. Lophoytocnozoac. EcdysozoaLophotrochzoans possess lophophoresLophophores: ciliated feeding structureORTrochophore: distinctional larval form during developmentAnimal development from zygote to adult can be characterized by numerous morphological/anatomical/ecological changeszygote → gastrulation → embryo → juvenile → adultZygote → gastrulation → embryo → larvae → juvenile → adultZygote → gastrulation → embryo → larvae → pupae → adultWhere larvae are generally: anatomically/morphologically/ecologically distinct from juvenile/adult formEcdysozoans: arthropods and nematodes undergo a cuticle moltingSponges (poriferans)- Most primitive metazoan (“parazoa”)- Lack true tissues, body symmetry, organs, etc.- ~10,000 species- May form “skeleton”CaCO3/sponging (protein)Silica (SiO2)“Anatomy/morphology” of a spongeCnidaria and ctenophora: two phyla of radially symmetrical animalsPhylum cnidaria: includes anemones, jellyfish, and clams- Freshwater – marine, sessile, or motile carnivores- Slimplest of Eumetoazoans (diploblastic)- ~ 10,000 speciesCnidaria morphology and anatomyEpidermis and gastrodermis: two adult types of CnidariaPolyp and medusa: two body orientations of CnidariaMedusa: motileCnidaria: feeding/sensory perception1. Prey capture/defense- Tentacles with cnidocytes- Highly modified toxin producing cells2. Simple nervosu system- Nerve net (no brain)Cnidocyte toxins: cytolytic and neurotoxinsCytolytic proteins: disrupt membranesNeurotoxins: disruption channels in neuronsQuizlet link:
View Full Document
Unlocking...