Environmental Engineering Reference
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FIGURE 9.5
Some representative mollusks (A-F), Annelids (G-J), Bryozoa (K-M), a tardi-
grade (N), and water mites (O, P). Organisms shown and their approximate lengths are as
follows: (A)
Quadrula,
7 cm; (B)
Corbicula,
3 cm; (C)
Dreissena,
3 cm; (D)
Pomacea,
4 cm;
(E)
Planorbella,
3 cm; (F)
Ferrissia,
4 cm; (G)
Branchiura,
10 cm; (H)
Ceratodrilus,
3 mm;
(I)
Placobdella,
16 mm; (J)
Hypaniola,
10 mm; (K)
Plumatella,
10 mm; (L) bryozoan tenta-
cles, 0.2 mm; (M)
Urnatella,
5 mm; (N) heterotardigrade, 0.3 mm; (O) generalized adult
water mite, 1 mm; (P) generalized larval water mite, 0.5 mm (reproduced with permission
from Thorp and Covich, 1991b).
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