Sciophila fractinervis
| Sciophila fractinervis | |
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| Species: | S. fractinervis
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| Sciophila fractinervis | |
Sciophila fractinervis is a species of fungus gnat in the family Mycetophilidae.
Distribution[edit]
Sciophila fractinervis is a tropical species and was originally described in 1940 by Frederick Wallace Edwards using specimens collected by Friedrich 'Fritz' Plaumann from the neighbourhood of Nova Teutonia, Santa Catarina, Brazil.[1] S. fractinervis has been found on cultivated greenhouse plants in the United Kingdom[2] and was recorded by Peter J. Chandler in 2010 on examples of commercially-grown Eustoma grandiflorum from Warwickshire. [3] This species was also recorded on greenhouse examples of Platycerium and Beaucarnea in the Netherlands in 2005.[4] S. fractinervis is considered by RINSE (Registry of non-native species in the Two Seas region countries) as a non-native species in Great Britain, France, Belgium and the Netherlands.[5]
Description[edit]
The larvae of Sciophila fractinervis are brown in colour and have a glossy appearance, due to being enclosed in a mucus tube created from labial glands around the mouth.[2]
The adults have a dark grey head with a yellowish face, a yellowish thorax, brown abdomen and yellow legs.[1][3] The mouthparts are black.[1] The wings of the male measure 2.5 - 2.7mm and the wings of the female are 2.9 - 3.2mm.[3][4] Females of the species have shorter antennae than males.[1]
Edwards observed that the macrotrichia (hairs or bristles) on the wings of S. fractinervis are less dense, and therefore more conspicuous than on the comparable species Sciophila ciliata.[1]
Life cycle[edit]
Sciophila fractinervis larvae build silky cocoons of webbing either on the basal leaves of their host plant or on the soil underneath.[3] The larvae eat fungus spores which grow upon the webbing to sustain themselves, mainly from saprophytic species of fungus that feed on decaying plant matter.[2] The webbing built by the larvae likely also provides a protective environment against predators as larvae have been observed retreating when the webbing is suddenly vibrated.[2] The leaves of the host plant do not appear to be damaged by the larval activity, at least in cultivated plant examples[2][3] but the webbing is considered unsightly by commercial plant growers.[2] The larvae take about 7-10 days to pupate and emerge as adults.[3][2]
References[edit]
- ^ a b c d e Edwards, Frederick Wallace (June 1940). "New Neotropical Mycetophilidae (IV) (Diptera)". Revista de Entomologia. 11 (1–2). Rio de Janeiro: 440–465.
- ^ a b c d e f g Deady, Rob J.; Delaney, Mark A.; Jones, Eleanor; Chandler, Peter J. "Further interceptions of the Neotropical fungus gnat Sciophila fractinervis Edwards, 1940 (Diptera, Mycetophilidae) in Britain with comments and observations on its biology and spread". Biodiversity Data Journal.
- ^ a b c d e f Chandler, Peter John (2010). "The South American fungus gnat Sciophila fractinervis (Edwards, 1940) (Diptera, Mycetophilidae) present in Britain" (PDF). Dipterists Digest. 17 (1): 50–52 – via dipterists.org.uk.
- ^ a b Chandler, Peter; Pijnakker, Juliette (January 2009). "Tropical fungus gnats established in nurseries in the Netherlands (Diptera: Keroplatidae and Mycetophilidae)". British Journal of Entomology and Natural History. 22 (2): 81–93 – via www.researchgate.net.
- ^ "Sciophila fractinervis". GBIF.org.