BIOL10005 Lecture Notes - Lecture 26: Hexapoda, Heat Detector, Chelicerata
15 Aug 2018
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* triploblastic (ectoderm, endoderm, mesoderm) presence of second body cavity enables increased functionality. * body segmentation serial repetition of functional units (compare with flatworms) * coelom acts as a fluid-filled (hydrostatic) skeleton. * closed vascular system transport vital gases, food & excretory products (greater potential for increased size as no longer just relying on osmosis & diffusion) * movement antagonistic circular & longitudinal muscles (helped my parapodia or chaetae) * have unjointed leg-like (cid:858)parapodia(cid:859) o(cid:374) e(cid:448)ery (cid:271)ody seg(cid:373)e(cid:374)t. * reproduction mostly sexual (joining of sperm & egg) via spawning (release sperm & egg into atmosphere) or hypodermic impregnation; some species hermaphroditic. * trochopore larvae free swimming ciliated larvae. * mostly terrestrial live in soil (feed on organic matter important for maintaining & recycling nutrients) * react to vibrations (perception of environments can be exploited by birds & humans) * have thermo-sensors to detect prey heat detector.
