Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 COMMUNITIES IN RUNNING WATERS 315 ilies Blepharoceridae (Fig. 89a) and Psychodidac (Fig. 896) is found a longitudinal row of sucking disks. Many of the may-fly nymphs have organs of attachment in the form of thickened and spiny rims on the tracheal gills, and an adhesive, disk-like thorax. The organs of attach- ment are especially unique in fishes and tadpoles of mountain streams; mouth, lower lip and ve

---

Ecological animal geography; an authorized, Ecological animal geography; an authorized, rewritten edition based on Tiergeographie auf ockologischer grundlage ecologicalanimal00hess Year: 1937 COMMUNITIES IN RUNNING WATERS 315 ilies Blepharoceridae (Fig. 89a) and Psychodidac (Fig. 896) is found a longitudinal row of sucking disks. Many of the may-fly nymphs have organs of attachment in the form of thickened and spiny rims on the tracheal gills, and an adhesive, disk-like thorax. The organs of attach- ment are especially unique in fishes and tadpoles of mountain streams; mouth, lower lip and ventral surface, and on fishes the fins also, may be reconstructed into sucking apparatus. This may occur in very

---

Size: 817px × 2448px
Photo credit: © Bookworm / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: archive, book, drawing, historical, history, illustration, image, page, picture, print, reference, vintage