| Apoda | ‖n. pl. [ NL., fr. Gr. &unr_;, &unr_;. See Apod, n. ] (Zool.) (a) A group of cirripeds, destitute of footlike organs. (b) An order of Amphibia without feet. See Ophiomorpha. (c) A group of worms without appendages, as the leech. [ 1913 Webster ] | | Apodal | { } a. [ See Apod, n. ] 1. Without feet; footless. [ 1913 Webster ] 2. (Zool.) Destitute of the ventral fin, as the eels. [ 1913 Webster ] Variants: Apod | | Apodan | a. (Zool.) Apodal. [ 1913 Webster ] | | Decapoda | ‖prop. n. pl. [ NL., fr. Gr. de`ka ten + poy`s, podo`s, foot. ] 1. (Zool.) The order of Crustacea which includes the shrimps, lobsters, crabs, etc. [ 1913 Webster ] ☞ They have a carapace, covering and uniting the somites of the head and thorax and inclosing a gill chamber on each side, and usually have five (rarely six) pairs of legs. They are divided into two principal groups: Brachyura and Macrura. Some writers recognize a third (Anomura) intermediate between the others. [ 1913 Webster ] 2. (Zool.) A division of the dibranchiate cephalopods including the cuttlefishes and squids. See Decacera. | | Decapodous | { } a. (Zool.) Belonging to the decapods; having ten feet; ten-footed. [ 1913 Webster ] Variants: Decapodal | | Hexapoda | ‖n. pl. [ NL., fr. Gr. "e`x six + -poda.] (Zool.) The true, or six-legged, insects; insects other than myriapods and arachnids. [1913 Webster] ☞ The Hexapoda have the head, thorax, and abdomen differentiated, and are mostly winged. They have three pairs of mouth organs, viz., mandibles, maxillæ, and the second maxillæ or labial palpi; three pairs of thoracic legs; and abdominal legs, which are present only in some of the lowest forms, and in the larval state of some of the higher ones. Many (the Metabola) undergo a complete metamorphosis, having larvæ (known as maggots, grubs, caterpillars) very unlike the adult, and pass through a quiescent pupa state in which no food is taken; others (the Hemimetabola) have larvæ much like the adult, expert in lacking wings, and an active pupa, in which rudimentary wings appear. See Insecta. The Hexapoda are divided into several orders. [1913 Webster] | | Myriapoda | ‖n. pl. [ NL., fr. Gr. &unr_; numberless + -poda. ] (Zool.) A class, or subclass, of arthropods, related to the hexapod insects, from which they differ in having the body made up of numerous similar segments, nearly all of which bear true jointed legs. They have one pair of antennae, three pairs of mouth organs, and numerous tracheae, similar to those of true insects. The larvae, when first hatched, often have but three pairs of legs. See Centiped, Galleyworm, Milliped. [ 1913 Webster ] ☞ The existing Myriapoda are divided into three orders: Chilopoda, Chilognatha or Diplopoda, and Pauropoda (see these words in the Vocabulary). Large fossil species (very different from any living forms) are found in the Carboniferous formation. [ 1913 Webster ] | | Stomapoda | ‖n. pl. [ NL. See Stoma, and -poda. ] (Zool.) An order of Crustacea including the squillas. The maxillipeds are leglike in form, and the large claws are comblike. They have a large and elongated abdomen, which contains a part of the stomach and heart; the abdominal appendages are large, and bear the gills. Called also Gastrula, Stomatopoda, and Squilloidea. [ 1913 Webster ] | | Tetradecapoda | ‖n. pl. [ NL. See Tetra-, and Decapoda. ] (Zool.) Same as Arthrostraca. [ 1913 Webster ] |
|
