Paraphaenocladius pseudirritus

Author: Strenzke, 1950

Diagnosis (n=3) (in part after Saether and Wang, 1995a - in italics)
Exuviae 2.3-2.9mm long (m=2.7mm).
Cephalothorax: Frontal setae and warts absent. Thoracic horn elongate, 158-208µm long (m=179µm), toothed apically; ThR 8.3-10.5 (m=9.1). Thoracic horn 143-229µm long (m=183µm); 17-22µm wide (m=19µm); 1.65-2.27x (m=1.97) as long as longer terminal seta on anal lobe. Precorneal setae 45-93µm long (3) long. Median antepronotals 41-56µm long (2) long, lateral antepronotals 34µm long (1) long. Dorsocentrals each 23-47µm long, distance between setae 1 and 2: 23-36µm (n=2), between setae 2 and 3: 71-128µm (n=2), between setae 3 and 4: 34-39µm (n=3). Wing sheaths without nose, but with pearl row, with 37-60 pearls (m=49).
Abdomen: Hook row II absent. Tergite I bare, II-VI with extensive shagreen, less extensive on VI, tergites VII-VIII with strong median shagreen. Tergites II-V with the largest points forming a transverse band just anterior to setae D1 (068i.jpg). Segment VII and VIII with paratergites point free. Sternites I and II bare, III-VIII with a few posterior points. Shagreen grading over into small posterior spines distinct on tergites VI-VIII and sternites VI-VII (female) or VIII (male). Pedes spurii B present on segment II, but weak.
Anal segment: Tergite IX with a few anteriomedian points; sternite IX bare. Anal lobe ratio 1.8, 2.0. Anal lobes without fringe, usually folded inwards and so appearing parallel-sided and apically truncate. Two strong apical setae on the anal lobes, 80-95, 100-123µm long (065i.jpg). Anal lobe with 1 basal seta 15-34µm long (n=3), 0.5-0.8µm wide (n=3); 2 terminal setae 79-109µm (m=91µm) and 30-53µm long (n=3) long, 2.6-4.5µm (m=3.4µm) (or 2.6-6.0µm (m=3.6µm) at extreme base) and 0.7-1.5µm wide (n=3) wide; shorter terminal seta 0.35-0.52x (n=3) as long and 0.23-0.27x (n=3) as wide as longer seta. Apex of anal lobe with 5-16 spines (m=10, n=5).
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 806: Orthocladiinae 218 Paraphaenocladius of the Text Key.
Note: According to Sæther and Wang (1995) the pupa of Paraphaenocladius intercedens is almost identical to that of pseudirritus, but has no pedes spurii B on segment II and has the basal seta of the anal lobe missing.

Holarctic species: widespread in Europe and Mediterranean (W Mediterranean see Paraphaenocladius pseudirritus maurus).
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Larvae in vegetation at the water's edge.