Author: (Holmgren, 1869)
Diagnosis (in part after Saether, 1989a - in italics)
Exuviae small, 3.09-5.53mm (n=3).
Cephalothorax: All setae 11-38µm long.
Abdomen: Armament of tergites of minute points. Tergite I bare; II with few weak postero-median, blunt points; III-IX with extensive, but not dense, blunt points and additional bands of stronger, pointed, grouped points. Flattened teeth of the posterior transverse rows without pleating, semicircularly rounded off at apex. Tergites without longitudinal ridges posteriorly. Tergites VI-VIII without a median circular patch of spinules. Sternites not armed posteriorly with teeth. Sternites I-II each with median hump with pointed points, otherwise essentially bare except for posterior bands of pedes spurii A; VII with few anterior points; VIII with stronger and more extensive shagreen; IX bare. Pedes spurii A present on ternites I-VII, interrupted medially on I, in complete rows on II-VII.
Anal segment: Anal lobe 248-281µm long; with 3 anal macrosetae, 34-41µm and 0.14x as long as anal lobe. Genital sheaths in male overreaching by 49-75µm long (n=2), in female short by 38µm long (n=1).
See Thienemann 1941b, p. 22.
(Linked adult male: Langton and Pinder, 2003a)
Species keys out at Page 787: Orthocladiinae 199 Metriocnemus of the Text Key.
Note: The pupa of Metriocnemus corticalis is very similar, but present material suggests that the anterior transverse bands of tergites III-V are composed of spinules grouped principally in twos or threes in corticalis, in transverse rows of five or six in ursinus.
Distribution
Holarctic species: widespread in Europe.
(For more information see module IdentifyIt – file: Orthocladiinae).
Ecological notes
Mountain ranges and northern (arctic) Scandinavia.