gill

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gill

(gĭl)
n.
Zoology The respiratory organ of most aquatic animals that obtain oxygen from water, consisting of a filamentous structure of vascular membranes across which dissolved gases are exchanged.

gilled adj.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.

gill

  1. the respiratory organ of aquatic animals. External gills, as in tadpoles, are produced by the embryonic ECTODERM; internal gills, as in fish, are developed from the pharynx and are thus endodermal (see ENDODERM). Gills are usually well supplied with blood vessels, and interchange of oxygen and carbon dioxide takes place across the extensive surface area (see COUNTERCURRENT EXCHANGE). Gills also occur in many invertebrates, for example, in insects such as the caddis fly larva and molluscs such as oysters. Occasionally, unusual structures act as gills, for example, the walls of the rectum in certain dragonfly nymphs, water being pumped in and out via the anus.
  2. the spore-carrying lamellae in basidiomycete fungi, located underneath the cap or ‘pileus’.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
References in periodicals archive ?
(17.) Lo CM, Morand S (2000) Spatial distribution and coexistence of monogenean gill parasites inhabiting two damselfishes from Moorea island in French Polynesia.
A total of 237 northern rock soles from 8 trawl hauls was examined at sea for gill parasites: 90 fish appeared to have at least one gill parasite and their heads were frozen at sea (Table 2).
A seasonal variation of the specific diversity in the community of monogeneans gill parasites of Rutilus rutilus was equally observed in Finland [10].
[36.] Arafa SZ, Reda ES (2011) Surface features of the monogenean gill parasites Pseudodactylogyrus anguillae and Pseudodactylogyrus bini from the European eel Anguilla anguilla in Egypt.
Effects of the gill parasite Zeuxapta seriolae (Monogenea: Heteraxinidae) on the sea cage-cultured Amberjack Seriola dumerili (Risso, 1810) at Penghu Island (Pescadores), Taiwan.