Marsh narrow-necked river
| Marsh narrow-necked river | ||||||||||||
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Marsh narrow-necked river |
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| Oxypselaphus obscurus | ||||||||||||
| ( Autumn , 1784) |
The marsh narrow-necked runner ( Oxypselaphus obscurus , syn .: Platynus obscurus ) is a beetle from the family of ground beetles and the subfamily of Platyninae . The genus name Oxypselaphus was derived from Old Gr . οξύς oxýs "pointed" and ψηλαφάω pselapháo "I feel" for the jaw probe and refers to the fact that the jaw probe ends with a point. The species name obscurus ( Latin ) "dark, gloomy" alludes to the color of the beetle. The word "Enghals-" does not refer to the neck, but on the neck plate , "Rotor" is for ground beetles in use, the prefix "swamp" refers to one of the habitats where the beetle occurs.
Characteristics of the beetle
The head and pronotum are black or black-brown, the wing covers dark brown, antennae and legs, however, light brown. The body reaches a length of 4.5 to six millimeters.
Four long bristle hairs sit on the head, one each in front and behind over the upper edge of the eye (supraorbital bristles). More bristle hairs sit on the upper lip . Lip and jaw palpations are noticeably long and slender, the end links pointed spindle-shaped (name). The large eyes are elongated. The eleven-jointed antennae are long and thread-like, they reach about half of the wing cover. The antennae segments are all round and hairy and dull only from the fourth segment onwards, the second and third antennae segments only have individual tubercles at the tip and are shiny. The second antenna element is short but longer than it is wide, the third antenna element is shorter than the first and second combined.
The pronotum is very slender, heart-shaped, the inward curvature begins well before the base, the greatest width is reached in the first third. The base is straight forward. It is dotted very concisely on the sides, in particular, and the back angles are pointed. The pronotum also has four bristle hairs. One each sits on the back corners, one each directly above the side edge, around the widest part of the pronotum.
The elytra are elongated oval, the rows of coarse dots lie in furrows that are strongly developed far beyond the middle, only towards the back do they become increasingly flatter. In the third interval between the rows of points there are pore points with further bristle hairs. There are also long bristle hairs on the edge of the wing cover.
The legs are long and not too strong. The first three members of the five-membered tarsi are somewhat widened in the males. The slender front rails are only slightly widened towards the front. The claws are imperforate.
biology
The name swamp narrow-necked beetle suggests that the beetle can be found in swamps. Its occurrence is by no means limited to such, but it is only dependent on high humidity. It occurs in moist forests (for example alluvial forests), in floodplains on floodplain meadows, in the reed zone on the edge of water and in the sedge zone of cattle pastures, as well as on wet heath. Among the humid locations it prefers humus-rich biotopes, in comparative counts it is mostly most common in riparian forests.
The adult animals are usually found under leaves, loose bark and stones. They hibernate as adults . They develop their greatest activity in spring, with a second activity peak in autumn. The species is light-loving, in the light organ they prefer the middle area.
distribution
The species is found circumpolar , in Europe it is only absent in the south, but occurs even in the north of Spain , Italy and Greece .
literature
- Heinz Joy, Karl Wilhelm Harde, Gustav Adolf Lohse: The beetles of Central Europe . tape 2 . Adephaga 1. Elsevier, Spektrum, Akad. Verl., Munich 1976, ISBN 3-87263-025-3 .
- Ekkehard Wachmann , Ralph Platen, Dieter Barndt: Ground beetles - observation, way of life . 1st edition. Naturbuch-Verlag, Augsburg 1995, ISBN 3-89440-125-7 .
Individual evidence
- ↑ a b Oxypselaphus obscurus in Fauna Europaea. Retrieved February 8, 2011
- ↑ Sigmund Schenkling: Explanation of the scientific beetle names
