Bi 212: Lecture 6 Phylum Echinodermata.

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Presentation transcript:

Bi 212: Lecture 6 Phylum Echinodermata

Phylum Echinodermata: Spiny-skinned

Evolutionary relationships Deuterostomes! and HOX genes

Echinodermata: 4 key features Calcareous internal skeleton Parts: Plates, spines and pedicellariae Why considered “internal”? Symmetry Bilateral symmetry (larvae) Pentamerous radial symmetry (adults) Water vascular system Derived from coelom Layout (next slide shows…) Key function: tube foot control Other functions Mutable connective tissue What does this mean?

Body plan: Other aspects Perivisceral coelom Houses organs Gas exchange Hydrostatic skeleton Digestive system Can be highly branched Complete in some Nervous system No brain Branches parallel water vascular system Sensory (sea stars) Eye spots Receptors associated with tube feet No circulatory system No excretory system

Class Asteroidea: sea stars Feeding Stomach eversion Enzymes Respiration Tube foot  ?  ? Dermal papulae  ? Protection Mechanisms?

Class Echinoidea: Sea urchins and others Feeding Aristotle’s lantern Main type of food? Respiration Tube foot  ?  ? Peristomial gills  ? Protection Mechanisms?

Class Holothuroidea: Sea cucumbers Symmetry? Feeding Deposit feeders (what does this mean?) Respiration Respiratory tree? Water entry into tree? Body surface ? Tube feet ? ? Protection Cuvarian tubules Evisceration…

Class Ophiuroidea: Brittle stars, basket stars

Class Crinoidea Sea lilies