thumbnail, Female '' Chrysotoxum bicinctum'' The genus ''Chrysotoxum'' (Meigen, 1803) consists of large, wasp-mimicking species. The adults are distinguished by very long antennae, oval abdomen with yellow stripes, and yellow patterns on the thoracic pleurae (sides of the

thorax The thorax (: thoraces or thoraxes) or chest is a part of the anatomy of mammals and other tetrapod animals located between the neck and the abdomen. In insects, crustaceans, and the extinct trilobites, the thorax is one of the three main di ...

). The species of ''Chrysotoxum'' are chiefly

Holarctic The Holarctic realm is a biogeographic realm that comprises the majority of habitats found throughout the continents in the Northern Hemisphere. It corresponds to the floristic Boreal Kingdom. It includes both the Nearctic zoogeographical reg ...

in distribution. . The species in this genus, are mostly very uniform in structure and colour and are separated with difficulty. Larvae are specialized in preying upon root aphids associated with ant nests.

Taxonomy

''Chrysotoxum'' is the only genus in the tribe Chrysotoxini Features common to this genus are: The head is slightly wider than the thorax. The eyes are more or less pubescent and are contiguous (contacting each other medially) in males and widely separated in females. They have a prominent or angular frons and antennae base, features best seen in profile. The face is slightly concave. The antennae are long and erect, inserted on the frontal angle, with the first two segments nearly equal, and the third one (flagellum) is three to six times longer than the previous ones. Abdomen strongly convex dorsally, very deeply margined. Abdomen strongly convex dorsally, very deeply margined. The wings have the median transverse vein located before the middle of the discal cell. The wing vein R₄₊₅ clearly dipped into cell r₄₊₅. There are many Chrysotoxum taxonomy concerns yet to be resolved due to the few morphological features available for species characterisation. Characters frequently used: the color of legs, the overall size, the connections between the various abdominal stripes and spots have been found to vary considerably within a species Differences in male terminalia, often of great diagnostic value in other genera are, so far, unhelpful among the majority of Chrysotoxum species.

Species

*'' C. amurense'' Violovitsh, 1973 *'' C. arcuatum'' (

Linnaeus Carl Linnaeus (23 May 1707 – 10 January 1778), also known after ennoblement in 1761 as Carl von Linné,#Blunt, Blunt (2004), p. 171. was a Swedish biologist and physician who formalised binomial nomenclature, the modern system of naming o ...

1758 Events January–March * January 1 – Swedish biologist Carl Linnaeus (Carl von Linné) publishes in Stockholm the first volume (''Animalia'') of the 10th edition of ''Systema Naturae'', the starting point of modern zoologic ...

) *'' C. asiaticum''

Becker Becker () is one of the German-language surnames, along with Bäcker and Baecker, that derive from the root, which refers to baking. The surname began as a name for a baker (and thus his family). In northern Germany, it can also derive from th ...

, 1921 *'' C. bactrianum'' Violovitsh, 1973 *'' C. bajkalicum'' Violovitsh, 1973 *'' C. baphyrum'' Walker, 1849 *'' C. bicinctum'' (

) *'' C. caucasicum''

Sack A sack usually refers to a rectangular-shaped bag. Sack may also refer to: Bags * Flour sack * Gunny sack * Hacky sack, sport * Money sack * Paper sack * Sleeping bag * Stuff sack * Knapsack Other uses * Bed, a slang term * Sack (band), ...

, 1930 *'' C. cautum'' (

Harris Harris may refer to: Places Canada * Harris, Ontario * Northland Pyrite Mine (also known as Harris Mine) * Harris, Saskatchewan * Rural Municipality of Harris No. 316, Saskatchewan Scotland * Harris, Outer Hebrides (sometimes called the Isle ...

, 1776) *'' C. chakassicum'' Violovitsh, 1975 *'' C. chinook'' Shannon, 1926 *'' C. cisalpinum''

Rondani Rondani is an Italian surname. Notable people having this name include: * Camillo Rondani, (1808–1879), an Italian entomologist noted for his studies of Diptera * Giovanni Maria Francesco Rondani Giovanni Maria Francesco Rondani (15 July 1490 � ...

, 1845 *'' C. continum'' Bezzi, 1915 *'' C. coreanum'' Shiraki, 1930 *'' C. derivatum''

Walker Walker or The Walker may refer to: People *Walker (given name) *Walker (surname) *Walker (Brazilian footballer) (born 1982), Brazilian footballer Places In the United States *Walker, Arizona, in Yavapai County *Walker, Mono County, California * ...

, 1849 *''

C. elegans ''Caenorhabditis elegans'' () is a free-living transparent nematode about 1 mm in length that lives in temperate soil environments. It is the type species of its genus. The name is a blend of the Greek ''caeno-'' (recent), ''rhabditis'' ( ...

'' Loew, 1841 *'' C. fasciatum'' (

Müller Müller may refer to: Companies * Müller (company), a German multinational dairy company ** Müller Milk & Ingredients, a UK subsidiary of the German company * Müller (store), a German retail chain * GMD Müller, a Swiss aerial lift manufacturi ...

, 1764) *'' C. fasciolatum'' (

De Geer The De Geer family (, ; also: De Geer van Jutphaas and De Geer van Oudegein) is a prominent industrial family of Walloon origin that belongs to the Swedish and Dutch nobility. History The name derives from the town of Geer near Liège (in pre ...

, 1776) *'' C. festivum'' (

) *'' C. flaveolum'' Violovitsh, 1973 *'' C. flavifrons'' Macquart, 1842 *'' C. fratellum'' Shannon, 1926 *'' C. gracile''

, 1921 *'' C. graciosum'' Violovitsh, 1975 *'' C. grandis'' Matsumura, 1911 *'' C. hameleon'' Violovitsh, 1973 *'' C. impressum''

, 1921 *'' C. integrum'' *'' C. intermedium'' Meigen, 1822 *'' C. kozhevnikovi'' Smirnov, 1925 *'' C. kozlovi'' Violovitsh, 1973 *'' C. lanulosum'' Violovitsh, 1973 *'' C. laterale'' Loew, 1864 *'' C. latifasciatum''

, 1921 *'' C. lessonae'' Giglio-Tos, 1890 *'' C. lineare'' (

Zetterstedt Johan Wilhelm Zetterstedt (20 May 1785 – 23 December 1874) was a Swedish naturalist who worked mainly on Diptera and Hymenoptera. Biography Zetterstedt studied at the University of Lund, where he was a pupil of Anders Jahan Retzius. He receiv ...

, 1819) *'' C. lydiae'' Violovitsh, 1964 *'' C. montivagum'' Violovitsh, 1973 *'' C. octomaculatum''

Curtis Curtis or Curtiss is a common English given name and surname of Anglo-Norman origin, deriving from the Old French ''curteis'' (Modern French">-4; we might wonder whether there's a point at which it's appropriate to talk of the beginnings of Fren ...

, 1837 *'' C. parmense''

, 1845 *'' C. parvulum'' Violovitsh, 1973 *'' C. perplexum''

Johnson Johnson may refer to: People and fictional characters *Johnson (surname), a common surname in English * Johnson (given name), a list of people * List of people with surname Johnson, including fictional characters *Johnson (composer) (1953–2011) ...

, 1924 *'' C. przewalskyi'' Portschinsky, 1887 *'' C. pubescens'' Loew, 1864 *'' C. radha'' Violovitsh, 1971 *'' C. radiosum'' Shannon, 1926 *'' C. ramphostoma'' Mutin, 1999 *'' C. rhodopense'' Drensky, 1934 *'' C. robustum'' Portschinsky, 1887 *'' C. rossicum''

, 1921 *'' C. rubzovi'' Violovitsh, 1973 *'' C. sackeni'' Giglio-Tos, 1890 *'' C. sapporense'' Matsumura, 1916 *'' C. sibiricum'' Loew, 1856 *'' C. skufjini'' Violovitsh, 1973 *'' C. stackelbergi'' Violovitsh, 1953 *'' C. stenolomum'' Violovitsh, 1973 *'' C. subbicinctum'' Violovitsh, 1956 *'' C. testaceum''

, 1913 *'' C. triarcuatum'' Macquart in Webb & Berthelot, 1839 *'' C. verae'' Violovitsh, 1973 *'' C. vernale'' Loew, 1841 *'' C. verralli'' Collin, 1940 *'' C. villosulum''

Bigot Discrimination is the process of making unfair or prejudicial distinctions between people based on the groups, classes, or other categories to which they belong or are perceived to belong, such as race, gender, age, class, religion, or sexu ...

, 1883 *'' C. willistoni'' Curran, 1924 *'' C. ypsilon'' Williston, 1887

References

{{Taxonbar, from=Q1767522 Hoverfly genera Syrphinae Taxa named by Johann Wilhelm Meigen