Uniramia was one of three phyla in the classification suggested by Sidnie Manton of the Arthropoda. Arthropods are Animals belonging to the Phylum Arthropoda (from Greek ἄρθρον arthron, " Joint " This classification suggested that the arthropods were a polyphyletic group with three phyla and phylum Uniramia included the Hexapoda (insects), Myriapoda (centipedes and millipedes) and the Onychophora (velvetworms). In Phylogenetics, a Taxon is polyphyletic ( Greek for "of many races" if the trait its members have in common evolved separately in different The subphylum Hexapoda (from the Greek for six legs) constitutes the largest (in terms of number of species grouping of Arthropods and includes the Myriapoda is a Subphylum of Arthropods containing Millipedes Centipedes and others The velvet worms ( Onychophora — literally "claw bearers" form a Clade within the Ecdysozoa and can be simply described as " Worms The discovery of fossil lobopods that are intermediate between onychophorans and arthropods however led to the separation of the Lobopoda and Onychophora as a separate group. FOSSIL is a standard protocol for allowing serial communication for Telecommunications programs under the DOS Operating system. Lobopodia is a group of poorly understood animals which mostly fall as a Stem group of Arthropods.

Onychophora like this Peripatoides indigo were originally included in the Phylum Uniramia

The name Uniramia thus became obsolete and was rejected as a polyphyletic group. UserPolbot. --> Peripatoides indigo is a species of Peripatus in the Peripatopsidae family The name Uniramia was later used for the Subphylum consisting of the insects + myriapods. The subphylum Uniramia was characterized by one pair of antennae and two pairs of mouthparts (single pairs of mandibles and maxillae). The mandible (from Latin mandibula, "jawbone" or inferior maxillary bone forms the lower Jaw and holds the lower teeth in place This article is about the Mammal maxilla For Arthropod maxillae see Mouthparts; for Insect maxillae in particular see Insect mouthparts Their body forms and ecologies are diverse, though (in contrast to the crustaceans) most unirames are terrestrial. This group, however, is more unambiguosly named the Atelocerata (Heymons, 1901) and is the preferred name for the clade uniting the Hexapoda (insects) + Myriapoda. The Atelocerata (Heymons 1901 is an obsolete Monophyletic group formed by the Hexapoda + Myriapoda, and sister group of the Eucrustacea, if A clade is a taxonomic group comprising a single Common ancestor and all the descendants of that ancestor The subphylum Hexapoda (from the Greek for six legs) constitutes the largest (in terms of number of species grouping of Arthropods and includes the Myriapoda is a Subphylum of Arthropods containing Millipedes Centipedes and others

The Crustacea were generally considered the closest relatives of the Uniramia, and sometimes these were united as Mandibulata. The subphylum Chelicerata constitutes one of the major subdivisions of the phylum Arthropoda including the Arachnids Horseshoe crabs and related forms Arachnids are a class ( Arachnida) of joint-legged Invertebrate Animals in the subphylum Chelicerata. Merostomata is a class of marine Chelicerata which includes Horseshoe crabs and Eurypterids It includes only four living Species but dozens Sea spiders, also called Pantopoda or pycnogonids ('pycnogonid' = Greek for 'thick knee' are marine Arthropods of class Pycnogonida The Trilobitomorpha ("three-lobed forms" is a subphylum of the phylum Arthropoda that includes the Trilobites Originally a variety of peculiar forms mostly Myriapoda is a Subphylum of Arthropods containing Millipedes Centipedes and others Symphylans, also known as garden centipedes or glasshouse symphylans, are Soil -dwelling Arthropods of the class Symphyla Centipedes (from Latin prefix centi-, "hundred" and Greek ποδός podos, " Foot " are Millipedes (Class Diplopoda, previously also known as Chilognatha are Arthropods that have two pairs of legs per segment (except for the first segment behind The subphylum Hexapoda (from the Greek for six legs) constitutes the largest (in terms of number of species grouping of Arthropods and includes the The Entognatha is a class of Ametabolous Arthropods which together with Insects makes up the hexapods. Structure of crustaceans As Arthropods crustaceans have a stiff Exoskeleton, which must be shed to allow the animal to grow ( Ecdysis or molting Structure of crustaceans As Arthropods crustaceans have a stiff Exoskeleton, which must be shed to allow the animal to grow ( Ecdysis or molting In arthropods the mandible is either of a pair of Arthropod Mouthparts used for biting cutting and holding food However, the competing hypothesis — that Crustacea and Hexapoda form a monophyletic group, the Pancrustacea, to which the Myriapoda are the closest relatives — has support from molecular and fossil evidence. Pancrustacea is a proposed Taxon, comprising all Crustaceans and hexapods  

Notes

References

• Paleos Metazoa: Arthropoda: Uniramia
• Bio 105-106 demo

External links

• A Cladistic Analysis of Arthropoda: Examining the Evolution of Biramous Appendages and Mandibles, Katherine McBride, Lindsey Moll, Whitney Zurat, Susquehanna University
• Uniramia at palaeos