Limuloidea :: Limuloidea (n. pl.) An order of Merostomata, including among living animals the genus Limulus, with various allied fossil genera, mostly of the Carboniferous period. Called also Xiphosura..

Molluscoidea :: Molluscoidea (n. pl.) A division of Invertebrata which includes the classes Brachiopoda and Bryozoa; -- called also Anthoid Mollusca.

Nematoidea :: Nematoidea (n. pl.) An order of worms, having a long, round, and generally smooth body; the roundworms. they are mostly parasites. Called also Nematodea, and Nematoda..

Nematoidean :: Nematoidean (a. & n.) Nematoid.

Neomenoidea :: Neomenoidea (n. pl.) A division of vermiform gastropod mollusks, without a shell, belonging to the Isopleura..

Ophiurioidea :: Ophiurioidea (n. pl.) Alt. of Ophiuroide.

Ophiuroidea :: Ophiuroidea (n. pl.) A class of star-shaped echinoderms having a disklike body, with slender, articulated arms, which are not grooved beneath and are often very fragile; -- called also Ophiuroida and Ophiuridea. See Illust. under Brittle star..

Orchidean :: Orchidean (a.) Orchidaceous.

Ostracoidea :: Ostracoidea (n. pl.) An order of Entomostraca possessing hard bivalve shells. They are of small size, and swim freely about..

Paleechinoidea :: Paleechinoidea (n. pl.) An extinct order of sea urchins found in the Paleozoic rocks. They had more than twenty vertical rows of plates. Called also Palaeechini.

Paleocrinoidea :: Paleocrinoidea (n. pl.) A suborder of Crinoidea found chiefly in the Paleozoic rocks.

Percoidea :: Percoidea (n. pl.) Same as Perciformes.

Phalangoidea :: Phalangoidea (n. pl.) A division of Arachnoidea, including the daddy longlegs or harvestman (Phalangium) and many similar kinds. They have long, slender, many-jointed legs; usually a rounded, segmented abdomen; and chelate jaws. They breathe by tracheae. Called also Phalangides, Phalangidea, Phalangiida, and Opilionea..

Polycystidea :: Polycystidea (n. pl.) A division of Gregarinae including those that have two or more internal divisions of the body.

Proboscidea :: Proboscidea (n. pl.) An order of large mammals including the elephants and mastodons.

Proboscidean :: Proboscidean (a.) Proboscidian.

Proteidea :: Proteidea (n. pl.) An order of aquatic amphibians having prominent external gills and four legs. It includes Proteus and Menobranchus (Necturus). Called also Proteoidea, and Proteida..

Pycnaspidean :: Pycnaspidean (a.) Having the posterior side of the tarsus covered with small irregular scales; -- said of certain birds.

Rideau :: Rideau (n.) A small mound of earth; ground slightly elevated; a small ridge.

Salamandroidea :: Salamandroidea (n. pl.) A division of Amphibia including the Salamanders and allied groups; the Urodela.

Scincoidea :: Scincoidea (n. pl.) A tribe of lizards including the skinks. See Skink.

Scorpionidea :: Scorpionidea (n. pl.) Same as Scorpiones.

Silicioidea :: Silicioidea (n. pl.) Same as Silicoidea.

Silicoidea :: Silicoidea (n. pl.) An extensive order of Porifera, which includes those that have the skeleton composed mainly of siliceous fibers or spicules..

Sipunculoidea :: Sipunculoidea (n. pl.) Same as Gephyrea.

Sipunculoidea :: Sipunculoidea (n. pl.) In a restricted sense, same as Sipunculacea..

Solpugidea :: Solpugidea (n. pl.) Same as Solifugae.

Spatangoidea :: Spatangoidea (n. pl.) An order of irregular sea urchins, usually having a more or less heart-shaped shell with four or five petal-like ambulacra above. The mouth is edentulous and situated anteriorly, on the under side..

Stelleridean :: Stelleridan (n.) Alt. of Stelleridea.

Struthioidea :: Struthio (n.) A genus of birds including the African ostriches.

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