Limuloidea

Limuloidea
Limuloidea Lim`u*loi"de*a (l[i^]m`[-u]*loi"d[-e]*[.a]), n. pl. [NL. See {Limulus}, and {-oid}.] (Zo["o]l.) An order of Merostomata, including among living animals the genus {Limulus}, with various allied fossil genera, mostly of the Carboniferous period. Called also {{Xiphosura}}. [1913 Webster]

Note: There are six pairs of leglike organs, surrounding the mouth, most of which terminate in claws; those of the first pair (probably mandibles) are the smallest; the others have the basal joints thickened and spinose, to serve as jaws, while the terminal joints serve as legs. This group is intermediate, in some characteristics, between crustaceans and certain arachnids (scorpions), but the respiration is by means of lamellate gills borne upon the five posterior abdominal appendages, which are flat and united in pairs by their inner edges, and are protected by the lidlike anterior pair, which also bear the genital orifices. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • Xiphosura — Limuloidea Lim u*loi de*a (l[i^]m [ u]*loi d[ e]*[.a]), n. pl. [NL. See {Limulus}, and { oid}.] (Zo[ o]l.) An order of Merostomata, including among living animals the genus {Limulus}, with various allied fossil genera, mostly of the Carboniferous …   The Collaborative International Dictionary of English

  • Merostomata — Mer o*stom a*ta, prop. n. pl. [NL., fr. Gr. me ros thigh + ?, ?, mouth.] (Zo[ o]l.) A class of Arthropoda, allied to the Crustacea. It includes the trilobites, {Eurypteroidea}, and {Limuloidea}. All are extinct except the horseshoe crabs… …   The Collaborative International Dictionary of English

  • Poecilopoda — P[oe] ci*lop o*da, n. pl. [NL., fr. Gr. ? variegated, manifold + poda.] (Zo[ o]l.) (a) Originally, an artificial group including many parasitic Entomostraca, together with the horseshoe crabs ({Limuloidea}). (b) By some recent writers applied to… …   The Collaborative International Dictionary of English

  • Xiphosura — Xiphura Xi*phu ra, n. pl. [NL., from Gr. xi fos sword + ? tail.] (Zo[ o]l.) Same as {Limuloidea}. Called also {Xiphosura}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Xiphura — Xi*phu ra, n. pl. [NL., from Gr. xi fos sword + ? tail.] (Zo[ o]l.) Same as {Limuloidea}. Called also {Xiphosura}. [1913 Webster] …   The Collaborative International Dictionary of English

  • Thoracetron — is an entire plate formed by the fusion of opisthosomal tergites behind opercular tergite (free abdominal segments) in Xiphosura of the order Xiphosurida, being considered a synapomorphy for this order (Anderson Selden, 1997). The order… …   Wikipedia

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  • Chelicerata (classification phylogenetique) — Chelicerata (classification phylogénétique) Cette page a pour objet de présenter un arbre phylogénétique des Chelicerata (ou Chélicérates), c est à dire un cladogramme mettant en lumière les relations évolutives complexes (relations groupes… …   Wikipédia en Français

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