Heterarthrus
vagans (Fallén, 1808) [Hymenoptera: Tenthredinidae]
Alder
sawfly
Tenthredo
melanorrhoea
Gmelin, 1790. [Unavailable]
Heterarthrus vagans (Fallén, 1808)
Hylotoma vagans Fallén, 1808
Phyllotoma vagans (Fallén, 1808)
Heterarthrus vagans vagans (Fallén, 1808)
Tenthredo amaura Klug, 1818
Tenthredo (Emphytus) amaura Klug, 1818
Phyllotoma vagans var. amaura (Klug, 1818)
Emphytus amaurus (Klug, 1818)
Emphytus (Phyllotoma) amaurus (Klug, 1818)
Phyllotoma melanopyga (Klug, 1818)
Tenthredo melanopyga Klug, 1818
Tenthredo (Emphytus) melanopyga Klug, 1818
Emphytus melanopygus (Klug, 1818)
Emphytus (Phyllotoma) melanopygus (Klug, 1818)
Phyllotoma vagans var. melanopygus Klug, 1818
Phyllotoma microcephala (Klug, 1818). [Unavailable]
Phyllotoma leucopoda Dahlbom, 1835
Phyllotoma vagans var. leucopoda Dahlbom, 1835
Phyllotoma melanopyga Healy, 1868. [Unavailable]
Phyllotoma kamtchatica Malaise, 1931 [not 1932]
Heterarthrus kamtchaticus (Malaise, 1931) [not 1932]
Heterarthrus vagans anatolicus Muche, 1983.
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Leaf
miner: A large, practically full depth brownish blotch, without an initial
corridor. The mine begins somewhere on the leaf and expands in all
directions, without having much consideration with even major veins.
In this respect the mine differs from that of Fenusa
dohrnii on the same host plant. Moreover, as a rule there
is just one mine per leaf. The full grown larva makes a disc-shaped
cocoon within its mine, with a diameter of about 7-9 mm. Unlike F. dohrnii the larva is rather vividly pigmented and can
easily be observed without dissecting the mine. Like most sawflies
the larva lies belly-up in its mine (Bladmineerders van Europa).
The
mine is also illustrated in British
leafminers.
Larva:
The larvae of sawflies have a head capsule, chewing mouthparts with opposable mandibles, six thoracic legs and abdominal legs (although they may be reduced) (see examples).
The larva is illustrated in British
leafminers and Bladmineerders van Europa.
Pupa:
The pupae of sawflies have visible head appendages, wings and legs which lie in sheaths.
Adult:
The adult is illustrated in ECatSym - Electronic World Catalog of Symphyta.
Hosts in Great Britain and Ireland:
Hosts
elsewhere:
Time
of year - larvae: Univoltine: autumn (British
leafminers).
Time
of year - adults: Currently unknown.
Comments:
Full synonymy and references are listed in ECatSym - Electronic World Catalog of Symphyta.
Distribution
in Great Britain and Ireland: Britain including Bedfordshire,
Cheshire, Cumberland, East Kent, Herefordshire, Monmouthshire, North Wiltshire, Oxfordshire, South Lancashire, Surrey, Warwickshire, West Kent and West Suffolk (NBN
Atlas).
Also
recorded in the Republic of Ireland (Fauna Europaea).
Distribution
elsewhere: Widespread in continental Europe Austria, Belgium,
Bulgaria, Corsica, Czech Republic, Danish mainland, Estonia, Finland,
French mainland, Germany, Hungary, Italian mainland, Latvia, Luxembourg,
Poland, Romania, Russia - Central, Slovakia, Spanish mainland, Sweden,
Switzerland, The Netherlands and Ukraine (Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere:
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