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Arthropoda
Arthropoda
Arthropoda A highly diverse phylum of jointed-limbed animals, which includes the crustaceans, arachnids, and insects as the major components, as well as the classes Symphyla, Pauropoda, Chilopoda (centipedes), Diplopoda (millipedes), and the extinct
Trilobita and eurypterids (see
CHELICERATA; and
MEROSTOMATA). Arthropods first appeared in the
Cambrian, already well diversified with such forms as the trilobites, trilobitoids,
Ostracoda, and crabs present, implying an earlier, hidden history, reaching back into the Precambrian. Embryological evidence shows that they are derived either from primitive
Polychaeta,
Annelida, or from ancestors common to both. Arthropods share with annelid worms a metamerically segmented body (see
METAMERIC SEGMENTATION), at least in the embryo, a dorsal heart, a dorsal anterior brain, and a ventral nerve cord that has segmental, ganglionic swellings. The limbs of all arthropods are paired, jointed, and segmental, and the body has a chitinous
exoskeleton. Primitively, the limbs and cuticular plates correspond to the metameric segmentation of the body, but in many groups there is considerable loss and/or fusion of segments.
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California Inventor Develops Arthropoda Species Visible Electromagnetic Spectrum Emissions Emulating Method
News Wire article from: US Fed News Service, Including US State News; 5/9/2007; 418 words
; ...visible electromagnetic spectrum emissions for member species of Arthropoda. According to the U.S. Patent & Trademark Office...visible electromagnetic spectrum emissions of member species of Arthropoda: Insecta: Coleoptera: Lampyridae by convergence of a programmable...
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ACMNPV IN PERMISSIVE, SEMIPERMISSIVE, AND NONPERMISSIVE CELL LINES FROM ARTHROPODA
Magazine article from: In Vitro Cellular & Developmental Biology; 9/1/2005; ; 700+ words
; SUMMARY Insect cell lines from Arthropoda represented by Lepidoptera, Coleoptera, Diptera, and Homoptera were evaluated for their ability to support replication of AcMNPV...
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CAMBRIAN NARAOIIDS (ARTHROPODA): MORPHOLOGY, ONTOGENY, SYSTEMATICS, AND EVOLUTIONARY RELATIONSHIPS
Magazine article from: Journal of Paleontology; 9/1/2007; ; 700+ words
; ABSTRACT - Naraoiids. defined as lightly sclerotized arthropods with a dimidiate tergum of two sclerites separated by a single transverse articulation, have been found in the Cambrian and Silurian. During the Cambrian they had a wide distribution coinciding with trilobite realms. This pattern may
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A new study of Marrella splendens (Arthropoda, Marrellomorpha) from the Middle Cambrian Burgess Shale, British Columbia, Canada.
Magazine article from: Canadian Journal of Earth Sciences; 6/1/2006; ; 700+ words
; Abstract: Study of over 1000 specimens of Marrella splendens Walcott, 1912, out of the more than 9000 collected by the Royal Ontario Museum (ROM) since 1975, has produced new information on the anatomy, functional morphology, and behaviour of this most common arthropod in the Burgess Shale fauna.
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A new early Cambrian bradoriid (arthropoda) from East Antarctica
Magazine article from: Journal of Paleontology; 7/1/2003; ; 700+ words
; ABSTRACT-Although bradoriids locally are common components of the Cambrian biota, they have been reported previously from Antarctica only from Tertiary glacial deposits. Here, we describe the bradoriid, Bicarinella evansi new genus and species, collected in situ from the upper Lower Cambrian
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Immunolocalization of serotonin in Onychophora argues against segmental ganglia being an ancestral feature of arthropods.(Research article)(Report)
Magazine article from: BMC Evolutionary Biology; 7/15/2007; ; 700+ words
; ...Due to their basal position within the Arthropoda, Onychophora represent a key group...concerning the phylogenetic position of Arthropoda within the Bilateria: (1) the traditional...sistergroup relationship of Annelida and Arthropoda, a rope ladder-like nervous system...
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The summer diet of the Yellow Rail in southern Quebec.
Magazine article from: Wilson Bulletin; 12/1/1997; ; 700+ words
; ...feathers, plants, Gastropoda, seeds, or Arthropoda. For each sample, grains of sand and...counted using shell apex, while seeds and Arthropoda were specifically counted and identified...found in studied habitats. Nearly all Arthropoda were highly digested and fragmented...
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Investigators at University of Georgia, Department of Entomology publish new data on life sciences.
Magazine article from: Women's Health Weekly; 2/5/2009; 700+ words
; A report, 'Gonadal ecdysteroidogenesis in arthropoda: occurrence and regulation,' is newly published data...Annual Review of Entomology (Gonadal ecdysteroidogenesis in arthropoda: occurrence and regulation. Annual Review of Entomology...
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Mitochondrial genome sequence and gene order of Sipunculus nudus give additional support for an inclusion of Sipuncula into Annelida.(Research article)(Report)
Magazine article from: BMC Genomics; 1/16/2009; ; 700+ words
; ...Malaskova [18]. Other analyses found Sipuncula to be sister group of Mollusca, Annelida and Arthropoda [19], Articulata (Annelida and Arthropoda) [14], Echiura [20], Mollusca [21], Annelida [22] or Annelida+Echiura [23...
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Trilobite systematics: The last 75 years
Magazine article from: Journal of Paleontology; 11/1/2001; ; 700+ words
; ...part to play in the new systematics. TRILOBITA: PLACE IN ARTHROPODA That trilobites were arthropods has been accepted for nearly...been at issue is the place that the group occupies within the Arthropoda, sensu lato. Inevitably this is entangled with the phylogenetics...
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Arthropoda
Book article from: A Dictionary of Zoology
Arthropoda A highly diverse phylum of jointed-limbed animals, which includes the...an earlier, hidden history, reaching back into the Precambrian. The Arthropoda comprise more than 75% of all animal species that have been described...
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Metamorphosis
Encyclopedia entry from: The Gale Encyclopedia of Science
...mollusks), Annelida (segmented worms), Arthropoda (insects and others), Echinodermata...significance of metamorphosis is in barnacles (Arthropoda phylum). Adult barnacles are sessile...metamorphosis occur in insects, a class of the Arthropoda phylum. There are about a half million...
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Trilobita
Book article from: A Dictionary of Zoology
Trilobita ( trilobites ; phylum Arthropoda ) The most primitive arthropod class (or in some classifications a phylum, where the Arthropoda rank as a superphylum), known from more than 3900 fossil species. Inhabitants of Palaeozoic seas, the...
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trilobites and related fossils
Book article from: The Oxford Companion to the Earth
...trilobites are among the best-known fossil examples of the phylum Arthropoda, an extensive group of organisms in which the body is segmented...and finally the Trilobita. In other schemes the phylum Arthropoda is retained and the major taxa are given subphylum or class...
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Crustaceans
Encyclopedia entry from: UXL Encyclopedia of Science
...of animals that belong to the class Crustacea in the phylum Arthropoda (organisms with segmented bodies, jointed legs or wings...attachment extending from the main part of an animal's body. Arthropoda: The largest single animal phylum, consisting of organisms...
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