Dimensions: Female- L = 0.87-1.065 mm, a = 22.59-25.35, b
= 4.07-4.53, c = 8.28-14.44, V = 48.08-50, Stoma = 0.32mm
Male- L = 0.825-0.93mm, a = 23.57-26.57, b = 4.13-4.22, c =
11.46-12.65, Stoma = .032mm, Spicules 0.032-0.036mm, Gubernaculum 0.009-0.011mm.
Female: Cuticle thick and clearly annulated. Longitudinal
stripes appear with fine knot-like thickenings (it appears, from Rühm's
illustrations that four longitudinal alae are present in each wing area).
Scattered setae on body of adults and larvae. Six distinct lips,
each exhibits two granular structures. Four thin cephalic setae,
two ventral submedian and two dorsal submedian. Amphids clearly visible.
Prorhabdions strongly cuticularized, slightly curved and non-articulate.
Esophagus begins on posterior portion of prostom. Meso-metastom funnel-shaped,
uniformly cuticularized. Esophagus, at first, slender, then widens
regularly to isthmus; posterior bulb oval. Triradiate denticulated
valve of posterior bulb well developed. Nerve ring at junction of
corpus and isthmus. Vulva equatorial. Gonads paired, short
with swollen club-like ovaries. Tail slender, terminates with a spinneret.
(Descriptions and measurements after Rühm 1956.)
Male: Similar to female. Two preanal supplementary
tubuli consistently present. Two postanal papillae. Spicules
paired, gubernaculum well-developed. Tail terminates with spinneret.
Habitat: Spruce mold in larval galleries of Ips typographus. Locality- Regensburg, Germany
This species may be distinguished from other species of Plectus
by the four longitudinal alae in each wing area. Rühm felt that
this species should be placed close to Anaplectus granulosus (used
as Plectus granulosus in Ruhm's paper). Rühm's illustrations,
however, indicate that this is a species of Plectus and not Anaplectus.
(Description- Maggenti, 1961)