Terms : Hide Images
| 52819002 | all protostomes must have | 3 germ layers, bilateral symmertry in at least one life stage, anterior brain that surrounds the entrance to the digestive tract, ventral nervous system with pair parallel nerve cords | |
| 52819003 | protosomes may have | spiral and determinate cleavage, schizocoelous body cavity formation, mouth develops from blastopore | |
| 52819004 | two groups of protostomes | lophotrochozoans and ecdysozoans | |
| 52819005 | lophotrochozoans | - internal skeletons, many have a trochophore larva, and some have a lophophore (a specialized feeding structure). | |
| 52819006 | ecdysozoans | external skeletons, grow by molting (ecdysis) | |
| 52819007 | arrow worms | Small predaceous worms that are common components of the marine plankton, | |
| 52819008 | lophophorates | polyphyletic, U-shaped fold in the body, lack distinct head | |
| 52819009 | phyla of lophophorates | ectoprocts, phoronids, brachiopods | |
| 52819010 | Ectoprocts | (moss animals) - microscopic, mostly marine forms that form branched colonies. | |
| 52819011 | phoronids | Distinctive U-shaped digestive tract. Both Phoronids and Brachiopods use lophophores for feeding. 20 species (all marine | |
| 52819012 | brachiopods | Have a mollusk-like bivalve shell, except that it is dorsal-ventral rather than lateral. | |
| 52819013 | Platyhelminthes | bilateral symmetry and no body cavity include flatworms fluckes and tapeworms | |
| 52819014 | Rotifers | small freshwater pseudocoelomates | |
| 52819015 | ribbon worms | a unique body cavity that houses a feeding organ | |
| 52819016 | Annelids | segmented coelomates with little body specialization | |
| 52819017 | annelid classes | oligochaete worms (earth worms) polychaete worms and leeches | |
| 52819018 | Mollusks | are unsegmented, but have a true coelom and most have shells and Soft-bodies in 3 parts: head-foot, visceral mass, and mantle | |
| 52819019 | mollusca classes | chitons (8 plates for shells) gastropods (snails) Bivalves (oysters) Cephaopods (squid) | |
| 52819020 | Ecdysozoans | have an external skeleton that periodically is shed (ecdysis) for growth. | |
| 52819021 | nematodes | include unsegmented free living and parasitic worms | |
| 52819022 | Onychophorans | closely are related to arthropods but lack specialization in appendages and body organization | |
| 52819023 | Arachnids (spiders, scorpions, ticks, mites) | Body having one or two main parts; six pairs of appendages (chelicerae, pedipalps, and four pairs of walking legs); nearly all terrestrial. | |
| 52819024 | Millipedes (class Diplopoda) | Body with distinct head bearing antennae and chewing mouthparts, segmented body with two pairs of walking legs per segment; terrestrial; herbivorous. | |
| 52819025 | Centipedes | Body with distinct head bearing large antennae and three pairs of mouthparts; appendages of first body segment modified as poison claws; trunk segments bear one pair of walking legs each; terrestrial; carnivorous. | |
| 52819026 | most successful arthropods | insects and crustacea | |
| 52819027 | insects | Body divided into head, thorax, and abdomen; 1 pair of antennae; mouthparts modified for chewing, sucking, or lapping; usually with two pairs of wings and three pairs of legs; mostly terrestrial, some freshwater. | |
| 52819028 | Crustacea | Body of two or three parts; 2 pairs of antennae; chewing mouthparts; three or more pairs of legs; mostly marine, some freshwater. | |
| 52819029 | success of insects because | good body, small size, high reproductive potential, wings for dispersal, complete metamorphosis |
