These unsegmented worms have been found in Cambrian rocks, such as the legendary Burgess Shale. |
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The fin rays sprouting from the ends are also unique in having a long, stiff unsegmented basal area. |
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To gain a more accurate understanding of the segmented or unsegmented nature of these four taxa, two types of data must be gathered. |
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In lancelets, the trunk somites extend and fuse ventrally to give the unsegmented periviscelar coelom. |
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The developmental mode of polychaetes is characterized by the production at hatching of an initially unsegmented trochophore larva. |
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Sipunculans, or peanut worms, have an unsegmented body with a retractable introvert. |
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Flatworms are unsegmented, bilaterally symmetrical worms that lack a coelom but that do have three germ layers. |
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In addition to the thorny proboscis, acanthocephalans are distinguished morphologically as cylindrical and unsegmented worms. |
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A regenerated lizard tail contains an unsegmented cartilaginous tube instead of a series of vertebrae as did the original tail. |
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Phylum Nemertea contains about 1,150 species of unsegmented worms that possess an eversible proboscis contained in a fluid-filled cavity or rhynchocoel. |
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At the front, or anterior end, of the body there is an unsegmented, presegmental region called the acron. |
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Slugs and snails have a soft, unsegmented body measuring 2 to 4 cm in length. |
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The spider has an unsegmented body with two main divisions and four pairs of walking legs. |
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Nematodes are microscopic, unsegmented round-worms. They are found world-wide in water, soil, decaying organic matter, plants and animals. |
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Nemertean worms are soft, leech-like, unsegmented and lack appendages. |
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Exopod unsegmented, with 2 long and 1 shorter unequal terminal aesthetascs, and 1 simple seta. |
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The head is enclosed in a hard, heavily sclerotized, unsegmented, exoskeletal head capsule, or epicranium, which contains most of the sensing organs, including the antennae, ocellus or eyes, and the mouthparts. |
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To be at sea is to experience life unsegmented into days, hours, minutes. |
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At the posterior end of the body there is another unsegmented region, the telson, that may bear two processes, or rami, which together form the furca. |
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This stage resembles the adult, but has a simple, unsegmented abdomen and only three pairs of thoracic limbs. |
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The most general characteristic of molluscs is they are unsegmented and bilaterally symmetrical. |
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The sub cylindrical body of the parasite was unsegmented with four cephalic horns around the mouth and two egg sacs located at the posterior of the body. |
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In an unsegmented network, everyone has access to everything. |
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