Biology lecture 4/17/151. Animal classification continued- Anatomy and embryological developmentAnatomy- Embryonic germ tissues- Body cavitiesDiploblastic: 2 embryonic germ tissues: Ectoderm and EndodermTriploblastic: 3 embryonic germ tissue regions: ectoderm, mesoderm, endodermDiploblastic animals- Ectoderm and endoderm present in gastrula- Separated by space: BlastocoelCoel = spaceTriploblastic animals: blastocoel is replaced by mesodermal tissueClassical animal classification1. Morphological- Body symmetry2. Anatomical- Embryonic tissue types1. Coelomate: body cavity lined by tissues derived from mesoderm. The muscle surrounds the internal organs2. Pseudocolelomate: only body wall lined by mesoderm derivatives3. Acoelomate: lack body cavitiesAnimal classification- Embryological development- Protostomal or DeuterostomalProtostomal- Blastropore → mouth- Cleavage: spiral, determinate- Coelom formation: schizocoelousDeuterostomal- Blastopore → anus- Cleavage: radical indeterminate- Coclom formation: enterocoelousCurrently different views of animal phylogenetic relationships1. Opinion based on morphology, anatomy, and development2. Opinion based largely on molecular data, corroborated by morphological and developmental observationOpinions based on morphology, anatomy, and development1. Radiata (radial symmetry)2. Bilateria (bilateral symmetry)a. Protostomous developmentb. Deuterostomous developmentQuizlet link:
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