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32 relations: Agnostida, Ainiktozoon, Arthropod, Arthropod head problem, Calymene blumenbachii, Cambrian, Carapace, Cephalothorax, Chelicerata, Crustacean, Devonian, Ecdysis, Ecological niche, Fallotaspis, Harpetida, Head, Hypostome (trilobite), Itagnostus, Journal of Paleontology, Malacostraca, Olenellina, Order (biology), Phylogeny of Malacostraca, Praecambridium, Proarticulata, Pygidium, Segmentation (biology), Silurian, Tagma (biology), Thorax, Thylacocephala, Trilobite.
Agnostida
Agnostida is an order of arthropod which first developed near the end of the Early Cambrian period and thrived during the Middle Cambrian.
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Ainiktozoon
Ainiktozoon loganense is an enigmatic fossil organism from the Silurian of Scotland.
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Arthropod
An arthropod (from Greek ἄρθρον arthron, "joint" and πούς pous, "foot") is an invertebrate animal having an exoskeleton (external skeleton), a segmented body, and paired jointed appendages.
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Arthropod head problem
The arthropod head problem is a long-standing zoological dispute concerning the segmental composition of the heads of the various arthropod groups, and how they are evolutionarily related to each other.
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Calymene blumenbachii
Calymene blumenbachii, sometimes erroneously spelled blumenbachi, is a species of trilobite discovered in the limestone quarries of Wren's Nest Hill in Dudley, England.
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Cambrian
The Cambrian Period was the first geological period of the Paleozoic Era, and of the Phanerozoic Eon.
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Carapace
A carapace is a dorsal (upper) section of the exoskeleton or shell in a number of animal groups, including arthropods, such as crustaceans and arachnids, as well as vertebrates, such as turtles and tortoises.
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Cephalothorax
The cephalothorax, also called prosoma in some groups, is a tagma of various arthropods, comprising the head and the thorax fused together, as distinct from the abdomen behind.
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Chelicerata
The subphylum Chelicerata (New Latin, from French chélicère, from Greek khēlē "claw, chela" and kéras "horn") constitutes one of the major subdivisions of the phylum Arthropoda.
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Crustacean
Crustaceans (Crustacea) form a large, diverse arthropod taxon which includes such familiar animals as crabs, lobsters, crayfish, shrimp, krill, woodlice, and barnacles.
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Devonian
The Devonian is a geologic period and system of the Paleozoic, spanning 60 million years from the end of the Silurian, million years ago (Mya), to the beginning of the Carboniferous, Mya.
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Ecdysis
Ecdysis is the moulting of the cuticle in many invertebrates of the clade Ecdysozoa.
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Ecological niche
In ecology, a niche (CanE, or) is the fit of a species living under specific environmental conditions.
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Fallotaspis
Fallotaspis is a genus of redlichiid trilobite genus found in Early Cambrian-aged strata of the United States and Morocco.
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Harpetida
Harpetida is one of the nine orders of the extinct arthropod class Trilobita.
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Head
A head is the part of an organism which usually includes the eyes, ears, nose, and mouth, each of which aid in various sensory functions such as sight, hearing, smell, and taste, respectively.
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Hypostome (trilobite)
The hypostome is the hard mouthpart of trilobites found on the ventral side of the cephalon (head).
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Itagnostus
Itagnostus is a genus of trilobite restricted to the Middle Cambrian.
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Journal of Paleontology
The Journal of Paleontology is a peer-reviewed scientific journal covering the field of paleontology.
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Malacostraca
Malacostraca is the largest of the six classes of crustaceans, containing about 40,000 living species, divided among 16 orders.
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Olenellina
Olenellina is a suborder of the order Redlichiida of Trilobites that occurs about halfway during the Lower Cambrian, at the start of the stage called the Atdabanian.
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Order (biology)
In biological classification, the order (ordo) is.
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Phylogeny of Malacostraca
Although the class Malacostraca is united by a number of well-defined and documented features, which were recognised a century ago by William Thomas Calman in 1904, the phylogenetic relationship (the evolutionary tree) of the orders which compose this class is unclear due to the vast diversity present in their morphology.
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Praecambridium
Praecambridium sigillum is an extinct organism that superficially resembles a segmented trilobite-like arthropod, though the majority of experts now place it within the Proarticulata.
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Proarticulata
Proarticulata is an extinct phylum of very early, superficially bilaterally symmetrical animals known from fossils found in the Ediacaran (Vendian) marine deposits, and dates to approximately.
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Pygidium
The pygidium (plural pygidia) is the posterior body part or shield of crustaceans and some other arthropods, such as insects and the extinct trilobites.
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Segmentation (biology)
Segmentation in biology is the division of some animal and plant body plans into a series of repetitive segments.
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Silurian
The Silurian is a geologic period and system spanning 24.6 million years from the end of the Ordovician Period, at million years ago (Mya), to the beginning of the Devonian Period, Mya.
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Tagma (biology)
In biology a tagma (Greek: τάγμα, plural tagmata – τάγματα) is a specialized grouping of multiple segments or metameres into a coherently functional morphological unit.
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Thorax
The thorax or chest (from the Greek θώραξ thorax "breastplate, cuirass, corslet" via thorax) is a part of the anatomy of humans and various other animals located between the neck and the abdomen.
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Thylacocephala
The Thylacocephala (from the Greek θύλακος or thylakos, meaning "pouch", and κεφαλή or cephalon meaning "head") are a unique group of extinct arthropods, with possible crustacean affinities.
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Trilobite
Trilobites (meaning "three lobes") are a fossil group of extinct marine arachnomorph arthropods that form the class Trilobita.
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Cephalon (arthropod anatomy), Cephalon (head), Cephalon (trilobite anatomy), Cephalon (trilobite), Cranidium, Fixigena, Glabella (trilobite anatomy), Glabella (trilobite), Librigena.
References
[1] https://en.wikipedia.org/wiki/Cephalon_(arthropod_head)
