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An Introduction to Animal Morphology and Systematic Zoology: PT. I ...
No preview available - 2016
abdomen ambulacral animal antennae anus axis body cavity branches branchial bristles caeca calcareous canals cartilage cells central capsule cephalothorax chitinous ciliated coenosarc consists contractile corpuscles cuticle developed dilated dioecious disc dorsal ducts ectoderm eggs elongated embryo endoderm eyes families female fibres foot forms four front ganglia ganglion genital gills glands groove head hinder hooks horny hydranth inner intestine jaws jointed labium laminae larvae lateral layer lobes longitudinal male mantle marginal maxillae membrane metameres mouth muscle muscular nerve ocelli oesophagus opening operculum organs outer oval ovary oviduct pair palps parasitic peristome pharynx pigment plastides plates pores posterior pouches proboscis processes protoplasm pseudopodia radial rarely retractile ring round rows rudimental segments separate sessile sexual shell simple sometimes species spermatozoa spicules spines spiral stalked stomach Sub-order suckers surface Synapta teeth tentacles thoracic thread-like tissue transverse tube tubular usually valves ventral vesicle wall yelk zooids