| Meiosimyza rorida (Fallén , 1820) |
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Scientific name: Meiosimyza rorida (Fallén , 1820) Common name: Other names: Other scientific name: Lyciella rorida. French name: Order: Diptera Family: Lauxaniidae Wingspan : 3.5 to 4 mm. Biotope: Damp forests. Low growing plants in deciduous woodlands. The larvae grow in the litter of dead leaves. Geographic area: Palaearctic region. Observation period : May to October. |
The flies of the Meiosimyza genus are small pale yellow flies, with a narrow waist. They are rather used to hiding under leaves than to flying away when you approach. They differ from those of the Sapromyza genus by the presence of dorsocentral bristles on the front part of the thorax, ahead of the suture. The old scientific name, Sapromyza rorida, is no more used following a change in the classification. Meiosimyza rorida has a pale russet yellow body with a shiny mesonotum (in the centre of the thorax). The apex of the antennae is slightly brownish. The acrostical bristles, at the middle of the thorax, are drawing irregular rows, the longest ones being in the centre. There is one dorsocentral bristle ahead of the suture and three after. You can distinguish two sternopleural bristles (on the side of the thorax, between the base of the two first pairs of legs). The wings are slightly yellow coloured. |
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I have photographed this small fly on a nettle leaf on the side of a forest track. The sternopleural bristles are clearly visible on the non-reduced picture. |
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I have been able to observe the acrostical and dorsocentral bristles with this upper side view. |
André Bon July 2013