| Echiuroidea (n. pl.) A division of Annelida which includes the genus Echiurus and allies. They are often classed among the Gephyrea, and called the armed Gephyreans. Thesaurus Entries C, Chilopoda, Chordata, Echiuroidea, Ectoprocta, Entoprocta, Monoplacophora, Nemertinea, Phoronidea, arachnid, arthropod, beetle, bicentenary, bicentennial, bug, caterpillar, cental, centare, centenarian, centenary, centennial, centennium, centigram, centimeter, centistere, centred, centref, centrev, centumvir, centumvirate, centurion, century, chilopod, cwt, daddy longlegs, diplopod, fly, gross, harvestman, hecatomb, hexapod, hundred, hundredweight, insect, larva, long hundred, maggot, millepede, millipede, mite, nymph, one C, scorpion, sesquicentenary, sesquicentennial, spider, tarantula, tercentenary, tercentennial, tick |