Chaetocladius piger

Author: (Goetghebuer, 1913)

Exuviae 4.6mm long (n=1).
Cephalothorax: Frontal setae 55-135µm long (n=5). Thoracic horn elongate, 170-263µm long, small-toothed, pointed at apex; ThR 6.1-9.5 (n=6). Precorneal setae 1-3: 80, 153; 60, 115; 60, 70µm long (n=2).
Abdomen: Tergite I unarmed, or with a small patch of points postero-laterally, and/or antero-laterally. Tergites II-VIII posteriorly with a conspicuous narrow transverse band of teeth, the remainder of the tergites covered with small points. Very few points present behind the posterior transverse tooth row on segment II. Points of apical bands as large as those in mid-tergite on segments III-V. Paratergite II relatively densely armed. Lateral setae 1-3 of segments II-VI of similar diameter and length, flexible, the fourth narrower and shorter. Lateral setae 1-4 of segment IV: 130-163; 128-163; 130-158; 53-120µm long (n=7); 1-3 of similar diameter, 4 much narrower; length longest seta 0.29-0.4 length IV (n=7).
Anal segment: Anal lobes rounded laterally, fringe absent; the 3 apical macrosetae short and strong, spine-like, 95-135µm long (n=7); length 0.4-0.62x length of lobe (n=3).
Note: Of type Chaetocladius pe1 Langton, 1984.
(Linked adult male: Langton and Pinder, 2003a)

Species keys out at Page 793: Orthocladiinae 205 Chaetocladius of the Text Key.

Holarctic species: widespread in Europe.
(For more information see module IdentifyIt – file: Orthocladiinae).

Ecological notes
Larva in Enteromorpha (algae forming tubular colonies) in a slow-flowing ditch.