BIOL 2030 Chapter 1: Lab 1 Notes
26 Feb 2017
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Taxanomic characteristics (cid:120) protista kindgdom is paraphyletic (a group of taxa is said to be paraphyletic if the group contains its last common ancestor but does not contain all the descendants of that ancestor) (cid:120) Class euglenoidea: some are found to have a light-sensitive stigma or eyespot which allows light only from one direction to strike a light sensitive receptor. Euglena is a plant-like flagellate and may contain chloroplast. Spindle-shaped body that moves by means of a single anteriorly projected flagellum and a second very short flagellum also has a function in locomotion. Worm like and expansion of the body is known as (cid:498)euglenoid movement(cid:499) Stigma: found at the base of the flagellum, it s a photoreceptive pigment or eyespot. Contractile vacuole(used for osmoregulation) found posterior to the reservoir (flagellum arises from a clear pear-shaped area) Most obvious structure are the chloroplasts, the shape and arrangement of the chloroplasts are used to determine the species of euglena.
