Xyelidae
Scientific classification
Kingdom: Animalia Phylum: Arthropoda Class: Insecta Order: Hymenoptera Suborder: Symphyta Superfamily: Xyeloidea Family: Xyelidae
Genera
see text Scientific classification or biological classification is a method by which biologists group and categorize species of organisms. ... Animalia redirects here. ... Subphyla and Classes Subphylum Trilobitomorpha Trilobita - Trilobites (extinct) Subphylum Chelicerata Arachnida - Spiders, Scorpions, etc. ... Orders Subclass Apterygota Symphypleona - globular springtails Subclass Archaeognatha (jumping bristletails) Subclass Dicondylia Monura - extinct Thysanura (common bristletails) Subclass Pterygota Diaphanopteroidea - extinct Palaeodictyoptera - extinct Megasecoptera - extinct Archodonata - extinct Ephemeroptera (mayflies) Odonata (dragonflies and damselflies) Infraclass Neoptera Blattodea (cockroaches) Mantodea (mantids) Isoptera (termites) Zoraptera Grylloblattodea Dermaptera (earwigs) Plecoptera (stoneflies) Orthoptera (grasshoppers, crickets... Suborders Apocrita Symphyta Many families, see article Hymenoptera is one of the larger orders of Insects, comprising the sawflies, wasps, bees, and ants. ... Families (Cephoidea)   Cephidae-stem sawflies (Megalodontoidea)   Megalodontidae   Pamphilidae-leaf-rolling      & web-spinning sawflies (Orussoidea)   Orussidae-parasitic wood wasps (Siricoidea)   Siricidae- horntails (Tenthredinoidea)   Argidae-argid sawflies   Blasticotomidae   Cimbicidae-cimbicid sawflies   Diprionidae-conifer sawflies   Pergidae-pergid sawflies   Tenthredinidae-common sawflies (Xyeloidea)   Anaxyelidae-cedar sawflies   Xyelidae-xyelid sawflies   Xiphydriidae-wood wasps Symphyta is... A Wood Wasp, also known as a parasitic wood wasp or horntail, is a mostly harmless flying insect, about 23 mm long, common for example in the United Kingdom. ...

The Xyelidae is a small family of sawflies known from fewer than 50 extant species in 5 genera, but with an extensive fossil record; they are the oldest fossil Hymenoptera, dating back to the Triassic, some 200 million years ago. Most species occur in the Northern Hemisphere, especially in boreal regions, though there are a few neotropical species. Most are associated with conifers (esp. Pinus and Abies), where the larvae feed on pollen or within buds, though larvae of a few species feed on the leaves of deciduous trees. (SUPERFAMILY) Families (Cephoidea)   Cephidae-stem sawflies (Megalodontoidea)   Megalodontidae   Pamphilidae-leaf-rolling      & web-spinning sawflies (Orussoidea)   Orussidae-parasitic wood wasps (Siricoidea)   Siricidae- horntails (Tenthredinoidea)   Argidae-argid sawflies   Blasticotomidae   Cimbicidae-cimbicid sawflies   Diprionidae-conifer sawflies   Pergidae-pergid sawflies   Tenthredinidae-common sawflies (Xyeloidea)   Anaxyelidae-cedar sawflies   Xyelidae-xyelid sawflies   Xiphydriidae-wood wasps Ref. ... Suborders Apocrita Symphyta Many families, see article Hymenoptera is one of the larger orders of Insects, comprising the sawflies, wasps, bees, and ants. ... The Triassic is a geologic period that extends from about 251 to 200 Ma (million years ago). ... Neotropical or Neotropic relates to a biogeographical region in the New World, bordered in the north by the dry areas in Mexico and the southern states of the USA. in the south by southern Patagonia. ... Orders & Families Cordaitales † Pinales   Pinaceae - Pine family   Araucariaceae - Araucaria family   Podocarpaceae - Yellow-wood family   Sciadopityaceae - Umbrella-pine family   Cupressaceae - Cypress family   Cephalotaxaceae - Plum-yew family   Taxaceae - Yew family Vojnovskyales † Voltziales † The conifers, division Pinophyta, are one of 13 or 14 division level taxa within the Kingdom Plantae. ... This article deals with the tree; for the e-mail client see Pine email client Species About 115. ... Species See text. ... A larva (Latin; plural larvae) is a juvenile form of animal with indirect development, undergoing metamorphosis (for example, insects or amphibians). ... SEM image of pollen grains from a variety of common plants: sunflower (Helianthus annuus), morning glory (Ipomoea purpurea), prairie hollyhock (Sidalcea malviflora), oriental lily (Lilium auratum), evening primrose (Oenothera fruticosa), and castor bean (Ricinus communis). ... Deciduous means temporary or tending to fall off (deriving from the Latin word decidere, to fall off). ...

The family is characterized by the appendages of the head, which are truly remarkable in that the antennae and palpi are nearly leg-like in structure, with a long basal segment followed by a series of tiny segments, as in the tibia-tarsus. It is tempting to speculate that there is a homeobox-gene explanation for this unusual anatomy, as mutations of this gene region in other insects can cause the mouthparts and antennae to become leg-like. For other uses, see Antenna. ... Pedipalps, the second pair of appendages of the cephalothorax in Arachnida, is homologous with mandibles in Crustacea, and corresponding to the mandibles of insects. ... An insect leg The arthropod leg is a form of jointed appendage of arthropods, usually used for walking. ... A homeobox is a DNA sequence found within genes that are involved in the regulation of development (morphogenesis) of animals, fungi and plants. ...

Extant Genera

• Macroxyela Kirby, 1882
• Megaxyela Ashmead, 1898
• Pleroneura Konow, 1897
• Xyela Dalman, 1819
• Xyelecia Ross, 1932