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An Introduction to Animal Morphology and Systematic Zoology
No preview available - 2019
abdomen absent animal anus appear arise arms attached axis base becomes blood body body cavity branches bristles calcareous called canals cavity cells chitinous ciliated circular close common connective consists containing covered developed disc divided dorsal double duct eggs embryo exist eyes families female fibres five foot forms four front ganglia ganglion genital gills glands groove head heart hinder hollow hooks includes inner intestine jaws jointed larvŠ lateral layer living lobes longitudinal male mantle marginal mass membrane mouth muscle muscular narrow nerve numerous opening oral Order organs outer oval pair parasitic pass pharynx placed plates pores pouches proboscis processes protoplasm radial rarely ring round rows segments separate shell short side simple single sometimes species spicules spines stomach suckers surface surrounded teeth tentacles terminal thick tissue transverse tube tubular usually valve ventral vesicle vessels wall