Rhinusa neta
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Rhinusa neta |
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| Scientific name | ||||||||||||
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| ( Germar , 1821) |
Rhinusa neta is a beetle in the family of weevils .
features
The beetles are 2 to 3.5 mm in size. Their coloration varies between ash gray and olive brown. Their oval convex body is more rounded than that of other Rhinusa species. If Rhinusa neta and Rhinusa antirrhini occur together on the same food plants, the beetles of the former species are 50 percent larger. Rows of fine yellow-brown hairs run over the body of the beetle. The beetles have a stiff, straight trunk (rostrum) with a blunt tip. In contrast to that of the females, the proboscis of the males is shorter than the pronotum .
distribution
Rhinusa neta is native to the Mediterranean region as well as southern and central Europe. The species is absent in northern Europe (Denmark and Sweden). In the east, it occurs as far as the Caucasus and the Middle East (Iran). The species was introduced in North America. The species was first observed in New England in 1937 . For the Pacific Northwest (Oregon to British Columbia) there is first evidence from 1954.
Way of life
The beetles are mostly found in meadows, agricultural areas and roadsides where their food and host plants grow. These are in particular the true toadflax ( Linaria vulgaris ) and the Dalmatian toadflax ( Linaria genistifolia dalmatica ). Other plants the beetles are found on are: tail toadflax ( Linaria spartea ), Linaria supina and striped toadflax ( Linaria repens ), as well as egg-leaved barnacle ( Kickxia spuria ) and snapdragon ( Antirrhinum majus ).
Eggs are usually laid between June and August. The larvae develop in the fruit capsules of their host plants. The new Beetle generation appears in August and September. The adults hibernate and mate the following spring. They can then still be observed between May and August.
The beetle species is considered to be a possible means of biological pest control , as it specializes in the tobacco herbs introduced into North America.
Taxonomy
There are the following subspecies:
- Rhinusa neta liebmanni ( Hoffmann , 1962) - only found in Italy
- Rhinusa neta neta ( Germar , 1821)
The following synonyms can be found in the literature that are no longer used:
- Cionus netus Germar , 1821
- Gymnetron netum ( Germar , 1821)
Other spellings that are no longer valid are Rhinusa netum and Cionus neta .
Web links
Individual evidence
- ↑ a b c d e Arved Lompe: Rhinusa - determination table . coleonet.de. Retrieved December 16, 2018.
- ↑ a b c d e f g h i j Rhinusa neta (Germar) . Ministry of Forests, Lands and Natural Resource Operations, British Columbia. Retrieved December 15, 2018.
- ↑ a b c d e Rhinusa neta at Fauna Europaea. Retrieved December 15, 2018
- ↑ a b c d Species Rhinusa neta . bugguide.net. Retrieved December 15, 2018.
- ↑ a b Rhinusa neta . www.biolib.cz. Retrieved December 15, 2018.