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This family comprises small to medium-sized flies,
with long legs and comparatively broad wings characterised by a
net-like pattern of folds. Mouthparts are usually well-developed in
females and reduced in males. Two genera are represented in the
Czech Republic and Slovakia, Blepharicera Macquart, 1843 and
Liponeura Loew, 1844. In the former, the eyes are divided
transversely into two regions, the upper one with larger ommatidia
than the lower one. The larvae are aquatic, living in rapidly
flowing streams, often in waterfalls, and feeding on periphyton (algae,
bacteria and other organic matter). Adults occur in the immediate
vicinity. Females are predatory, but males possibly feed on flower
nectar.
Altogether 40 species and subspecies are known to
occur in Europe (Zwick
2007a, after adjustments), of which seven taxa are listed in the
present checklist, including two subspecies of Liponeura
cinerascens: six from the Czech Republic (five in Bohemia,
six in
Moravia) and six from Slovakia. There have been no additions or
corrections since the PCV2. No
additional species are expected from either the Czech Republic or
Slovakia.
Larvae, pupae and males of the Czech and Slovak
species may be identified using the keys by Tuša (1986,
1992a,
b). The nomenclature is adopted from Zwick (2007a),
but Blepharicera fasciata is not ranked as a subspecies.
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