ZOO 2700 Lecture Notes - Lecture 8: Jet Propulsion, Manowar, Motility

• School: University of Guelph
• Department: Zoology
• Course: ZOO 2700
• Professor: Alex Smith

Document Summary

Apomorphies: medusa stage, linear mitochondrial dna. Reproduction: release gametes into the water and releases larva that look a lot like placozoans, medusa planula polyp medusa. Apomorphies: medusa with, rhopalia (sense organs, mesogleal, gastrodermal and epidermal, gastrodermal statocyst, mechano, photo, and chemoreceptor, gastric filaments, bear nematocysts and digestive cells, strobilation. Have a nervous system, no brains: light reception. Apomorphies: small polyps lacking septa, cubic medusa, tentacles on pedalia at 4 corners of bell, 4 rhopalia with ocelli, velarium: very powerful waterjet (developmentally different from velum) A lineage of hydrozoans largest predatory fish. Made of hundreds of reproductive, digestive and fishing zoids beneath a float (pneumatophore) Jet propulsion movement (moves it backwards: collocytes, glue bear cells, creating a sticky substance for prey capture, on epidermis and tentilla (cid:494)spin-capture(cid:495) So many undescribed because: poorly preserved, poorly sampled, extremely difficult to collect and identify, cannot be preserved, many species inhabit hard-to-reach locations.