In this state, they can withstand harsh.They share many characteristics with arthropods.Ĭryptobiosis, where metabolism is imperceptible.Tardigrades, or water bears, are less than a.Velvet worms (phylum Onychophora) are nocturnalĬaterpillar-like animals that have changed little.Some of the phyla within the Ecdysozoa are very.The relationship of the blastopore to the mouth.Coelom formation enterocoelous at least in some.One living species, Lingula, is considered to beĪ living fossil since it has changed little since.Prolific during the Paleozoic and Mesozoic eras. Brachiopods are an ancient group they were.Pedicel a fleshy stalk used for attachment.Brachiopods appear similar to bivalve molluscsīecause they have two calcareous shell valves.Cleavage is radial (deuterostome) but determinate.Fossils date to the Ordovician (505 mya).Bryozoans (phylum Ectoprocta) are aquatic, mostly.Coelom formation highly modified enterocoelous.Tentacles of the lophophore are extended for.Species in the phylum Phoronida are small.Tentacles on a ridge surrounding the mouth, but Lophophore a unique arrangement of ciliated.Protostome and deuterostome characteristics.Seemingly different phyla that have several Symbiotic chemoautotrophic bacteria that use No digestive tract most nutrition comes from.Vestimentiferan worms found at hydrothermal vent Phylum Pogonophora includes the tube-dwelling.Extend proboscis (cant be retracted) out to.Phylum Echiura is another group of marine,īenthic worms that often live in the sediment.Retractable proboscis used for feeding.Worms that often live burrowed in the sand. ![]() Phylum Sipuncula consists of marine, benthic.Suggests that perhaps they should be included Many ways to annelids and molecular evidence Sipuncula, Echiura, Pogonophora are similar in.Include examples from superphyla Lophotrochozoa Several small phyla of protostome coelomates.
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