Trident arrow owl

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The trident arrow (Acronicta tridens), also called the trident arrow, is a butterfly (night butterfly) from the family of owl butterflies (Noctuidae).

Features
The moths have a wingspan of 36 to 44 millimeters. The primary colour of the forewings is grey, usually dark grey and relatively uniformly coloured. Root line and tornal line are clearly developed, as are the inner and outer transverse lines. These are drawn black and double. On the other hand, the middle shadow is only clearly visible at the front and rear edges, the hem line is unclear. The ring mark and the kidney mark are clearly visible in the region of the intermediate mark. The fringes are white with narrow internal lines. The hind wings of the males are usually completely white, in some forms there is a black sputtering of the vein in the distal parts of the veins. In females, the hind wings are grey at the base and become darker towards the outer edge. The middle transverse line and the discal spot can only be seen indistinctly, but the hem line is drawn clearly black. The underside of the front and rear wings is grey, with the underside of the front wing being slightly darker. Both undersides have a central transverse line and a discal spot, the transverse line on the underside of the rear wing having a weak design. The head and thorax are colored grey.

The egg is very flattened and conical. The surface is provided with strong longitudinal ribs. It has a pale yellow colour with a red-brown spot in the middle and three other spots of the same colour.

The black-gray, relatively long and slender caterpillars have relatively little hair. The red-yellow back strip is divided by a black midline. It has a short, black pin on the 4th segment on its back. The 11th segment has a black, red and yellow dotted elevation. The broad, yellow-white sidelines are spotted red. The head is black gray.

The doll is red-brown with a bristled Kremaster.

The moths of the alder arrow (Acronicta cuspis), the arrow owl (Acronicta psi) and the moths of the trident arrow (Acronicta tridens) are very similar and can only be safely distinguished by genital examinations. The following are listed:
The moths of A. cuspis and A. tridens are slightly larger on average, but the absolute size range is almost the same.
The shades of the primary color differ slightly, A. cuspis often has a stitch in the bluish. The root line and the tornal line are very clearly developed. The hind wings of the male are dark gray with a relatively clear midline and discal spot. For the other two species, the hind wings are white, except for the hemline (for A. tridens) or black sputtered along the vein at A. psi.
The leading wing of A. psi is by far the most variable in terms of the primary color; This var