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Drowned in a farmland pool.
Body length: 5.5 mm.
Forewing length: 5.7 mm.
Antenna with 18 segments.

[Lacourt 2020]
Antennae inserted between the eyes above the clypeus.
Forewings with two or three cubital cells and two closed discoidals.
Radial cell of the forewing with at the most only one transverse vein.
Antennae different: the third segment normal, short and not dilated.
Apex of the fore tibias with two spurs.
Abdomen normal, more or less cylindrical.
Head not flat; clypeus with width clearly smaller than the distance between the eyes.
(Tenthredinoidea)
Antennae always with more than four segments.
Antennae not swollen into a club.
Abdomen not carinate laterally, more or less cylindrical.
Forewing with a stigma distinctly visible, normally developed and broader than the subcostal vein.
Antennae with between 17 and 22 segments, serrate in the female.
Ocelli almost aligned.
Diprionidae
Anal cell of forewing constricted in middle and without cross-vein.
Wings often densely pubescent with apical margin ciliated.
Monocteninae
Intercostal cell of forewing with a cross-vein.
Hindwing with petiole of anal cell 2 x longer than greatest width of cell.
Distance between posterior ocelli equal to that between ocellus and eye margin or posterior margin of head.
Monoctenus Dahlbom

Thorax completely black.
Legs [in part] black.
Size: 5-6 mm.
Hind legs with tibias and tarsi all yellow.
Wings hyaline; stigma pale yellow in middle.
Abdomen with yellow band laterally in female.
Monoctenus juniperi (L., 1758)