Xyelidae

Xyelidae

Taxobox



image_size = 230px
image_caption = "Xyela" the Type genus of Xyelidae. From "British Entomology".
name = Xyelidae
fossil_range=Triassic - Recent
regnum = Animalia
phylum = Arthropoda
classis = Insecta
ordo = Hymenoptera
subordo = Symphyta
superfamilia = Xyeloidea
familia = Xyelidae
subdivision_ranks = Genera
subdivision = see text

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.

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.

Extant genera

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


Wikimedia Foundation. 2010.

Игры ⚽ Нужен реферат?

Look at other dictionaries:

  • Xyelidae — ? Xyelidae Xyela pusilla Научная классификация Царство …   Википедия

  • Xyelidae —   Xyelidae Rango temporal: Triásico Reciente …   Wikipedia Español

  • xyelidae — xy·el·i·dae …   English syllables

  • xyelidae — zīˈeləˌdē noun plural Usage: capitalized Etymology: New Latin, from Xyela, type genus (from Greek xyēlē curved knife, from xyein to scratch, scrape) + idae : a small family of primitive sawflies having larvae that feed on the foliage of trees …   Useful english dictionary

  • Расницын, Александр Павлович — Александр Павлович Расницын А.П. Расницын Дата рождения …   Википедия

  • Пилильщики — ? Пилильщики Пилильщик Macrophya montana Научная классификация …   Википедия

  • Xyeloidea — ? Xyeloidea Научная классификация Царство: Животные Тип: Членистоногие Класс: Насекомые …   Википедия

  • Ксиелоидные — ? Xyeloidea …   Википедия

  • Гигантская мегаксиела — ? Гигантская мегаксиела Научная классификация Царство: Животные Тип: Членистоногие Класс: Насекомые …   Википедия

  • Сидячебрюхие — Пилильщик Macrophya montana …   Википедия

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”