Narenta dwarf beetle

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Narenta dwarf beetle
Systematics
Class : Insects (Insecta)
Order : Beetle (Coleoptera)
Subordination : Polyphaga
Family : Long- button water beetle (Hydraenidae)
Genre : Aulacochthebius
Type : Narenta dwarf beetle
Scientific name
Aulacochthebius narentinus
( Reitter , 1885)

The Narenta dwarf beetle ( Aulacochthebius narentinus ) from the family long-sea beetles (Hydraenidae) of the class of insects is one of the species that are particularly worthy of protection . With a maximum height of 1.2 mm, it is one of the smallest water beetles. It was first described by Edmund Reitter in 1885 .

features

The Narenta dwarf beetle is 1–1.2 mm long and has a rather compact body. On the pronotum there are two deep transverse furrows, in the rear part it is deeply cut out on both sides, in the front part it has laterally noticeable widenings that are formed by hyaline membranes. The dark brown wing-coverts are short-oval, covered with dense, roughly dotted stripes and rows of very fine hairs. The belly is yellow-red. The end link of the jaw probe is much smaller than the penultimate link and resembles a conical tip.

Occurrence

The distribution area extends from northern Germany and northern Italy to south-eastern Europe to Israel , although the species in central Europe can only be found in a few locations in Germany , the Czech Republic and Austria . Despite years of targeted search, the first record of this species in Austria was not made until 2002. The Narenta dwarf beetle is also extremely rare in the rest of the distribution area.

Habitat / biology

Very little is known about the habitat requirements of the Narenta dwarf beetle in Central Europe. In any case, it seems to prefer the bank areas of potamale and standing waters in the flat or hilly country, although it can also be found at some distance from the waterline . At the only site in Lower Austria, a large number of specimens were washed away from the loamy, vegetation -free, partially shaded, approx. 50 cm high steep bank of a former fish pond. This fish pond is located in the middle of a riparian forest, through which a small potamale channel flows. The Narenta dwarf beetle was also found in the sand of an extensively used fish pond in the Czech location, namely near Valtice , just under two km from the Austrian border.

Causes of danger and need for action

Loamy-sandy banks in natural surroundings are generally among the most threatened biotopes.

The Narenta pygmy beetle is rare in the entire range and largely restricted to isolated relict occurrences, which is why species protection has a particularly high responsibility with regard to the conservation of this species.

For more detailed research on the distribution of this species, targeted extensive faunistic investigations must be carried out on all near-natural potamal and stagnant waters, whereby the focus should be on poorly vegetated, loamy or fine sandy steep bank areas. The "Pranhartsberg marshland" (see Fahn 2002) in Lower Austria must be protected. In addition to Aulacochthebius narentinus , other endangered water beetle species (e.g. Hydraena paganettii ) also live there .

literature

  • Edmund Reitter: Fauna Germanica - The beetles of the German Empire . 5 volumes. KG Lutz, Stuttgart 1908-1917. (digital: Edmund Reitter: Fauna Germanica - Die Käfer des Deutschen Reiches. (= digital library. Volume 134). Directmedia Publishing, Berlin 2006, ISBN 3-89853-534-7 ).
  • P. Aguilera, I. Ribera, C. Hernando: Notes on the Palaearctic species of Aulacochthebius, with a description of A. libertarius sp. n. from the Moroccan Anti Atlas (Coleoptera: Hydraenide). In: European Journal of Entomology. Volume 95, 1998, pp. 629-637.
  • MA Jäch, M. Lederwasch, R. Schuh: Remarkable beetle finds from Austria (XI). In: Coleopterological review. Volume 72, June 2002, pp. 209-212.

Individual evidence

  1. ↑ Edmund Reitter: Coleoptera. In: A. Brauer (Ed.): Fresh water fauna of Germany. Issues 3 and 4, G. Fischer, Jena 1909, pp. 58–59
  2. ↑ Only occurrence in Austria
  3. ^ Red list of endangered animals in Austria: CR (threatened with extinction).
  4. ↑ Red List of Endangered Animals in Germany (Hess et al. 1999): endangered.
  5. ^ Red list of endangered animals in Lower Austria: CR (threatened with extinction).