Longitarsus ochroleucus

Taxonomy

  • Polyphaga
  • Chrysomeloidea
  • Chrysomelidae
  • Longitarsus
  • Longitarsus ochroleucus

Description

Size: 2-2.5mm
Basic colour: Pale dusky yellow
Pattern colour: None
Number of spots: None
Pronotoum: As basic colour
Leg colour: As basic colour, hind femora black (at least in apical half)
Confusion species: Longitarsus gracilis

Palaearctic, including North Africa.

Biology

Status: Widely scattered records but has declined, hence recent records only from England and may once have been common in arable fields. Scarce (Notable B)
Habitat: Grassland, commons, woodland, sand & chalk pits, beaches (around high-water mark), and possibly on disturbed ground.
Host plant: Ragworts (Senecio spp.); sometimes other Asteraceae.
Overwintering: As early instar larvae (adults die before winter)
Food: Adults on leaves (possibly also flower buds and/or pollen), larvae on roots.
Other notes: Similar to L. gracilis var. poweri (note colour of hind femora)

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Longitarsus obliteratus

Taxonomy

  • Polyphaga
  • Chrysomeloidea
  • Chrysomelidae
  • Longitarsus
  • Longitarsus obliteratus

Description

Size: 1.1-1.5mm
Basic colour: Blackish, usually with a weak metallic reflection.
Pattern colour: None
Number of spots: None
Pronotoum: As basic colour
Leg colour: Yellow-orange, hind femora darkened.
Confusion species: Longitarsus obliteratoides

Palaearctic (not Scandinavia), including the Middle East and North Africa.

Biology

Status: Scattered south of the Humber estuary, plus an old record from Armagh, Ireland.
Habitat: Various
Host plant: Various Lamiaceae, especially Breckland thyme, Thymus serpyllum
Overwintering: As adults, eggs and early instar larvae.
Food: Adults on leaves, larvae at roots.
Other notes: Elytral punctures coarser than in L. obliteratoides

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Longitarsus pellucidus

Taxonomy

  • Polyphaga
  • Chrysomeloidea
  • Chrysomelidae
  • Longitarsus
  • Longitarsus pellucidus

Description

Size: 2-2.5mm
Basic colour: Dusky yellow
Pattern colour: None (head reddish)
Number of spots: None
Pronotoum: As basic colour
Leg colour: As basic colour, hind femora darkened (usually reddish-brown)
Confusion species: Longitarsus succineus

Palaearctic; also Middle East to India, plus North Africa. Introduced into Canada.

Biology

Status: Widespread in England, rare in Wales, old records only in Ireland, no records in Scotland.
Habitat: Various
Host plant: Various Convolvulaceae
Overwintering: Only as larvae (adults die before winter)
Food: Adults on leaves, larvae in roots.
Other notes: Antennal segment 11 the same colour as segment 10 (in the similar L. succineus, segment 11 is slightly darker). L. pellucidus also has more strongly developed elytral 'shoulders', but dissection of the aedeagus may be required to separate these species.

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Longitarsus parvulus

Taxonomy

  • Polyphaga
  • Chrysomeloidea
  • Chrysomelidae
  • Longitarsus
  • Longitarsus parvulus
Common name
Flax & linseed flea beetle

Description

Size: 1.3-1.5mm
Basic colour: Shiny reddish-brown, dark brown or black.
Pattern colour: None
Number of spots: None
Pronotoum: As basic colour
Leg colour: Orange-brown, hind femora darkened.

Palaearctic, also Macaronesia, Cape Verde and North Africa. Expansion in the UK may be due to increased acreage of flax/linseed cultivation.

Biology

Status: Widespread and fairly common. Previously considered Scarce (Notable), but has increased in range and abundance, hence not now threatened. No records from Scotland, only old records from Ireland
Habitat: Various
Host plant: Linum spp (wild and cultivated)
Overwintering: As adults
Food: Adults on leaves, larvae at roots - can cause economically significant damage to seedlings of commercial flax/linseed crops.
Other notes: Adults parasitised by a braconid wasp (probably Perilitus sp.), a nematode (Howardula phyllotretae) and a mite (Trombidium sp.). Eggs parasitised by a mymarid wasp (Anaphes regulus).

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