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The outermost cell layer of the cortex of plants. Also known as exodermis.
(invertebrate zoology)
The layer of cells that underlies and secretes the cuticle in arthropods and some other invertebrates.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.



in invertebrates (for example, crustaceans, arachnids, and insects), the thin layer of usually cylindrical epithelium lying immediately under the cuticle (which is formed by the secretory activity of the cells of the hypodermis). The various cutaneous glands and the tactile and olfactory hairs are located in the hypodermis. In nematodes, gastrotrichs, and several other worms, the hypodermis is a syncytium that secretes the cuticle.

In plants, the hypodermis is one or more layers of cells located under the epidermis of the stems, leaves, seeds, and fruits, or under the epiblem (piliferous layer) of the roots. The hypodermis is part of the primary cortex of stems, often consisting of cells with thickened walls, and may be classified by function as mechanical tissue. It is most characteristic of succulents. In leaves the hypodermis consists of one, or more often several, layers of cells of aquiferous tissue (for example, in a number of tropical plants) or of mechanical tissue (for example, in pines and sago palms). In the leaf the hypodermis is formed when the cells of the epidermis are divided by septa that are parallel to the surface of the leaf, such as in Ficus and Begonia, or from cells of the mesophyll of the leaf tissue lying under the epidermis, such as in some palms. In roots the outer layers of cells of the primary cortex are sometimes called the exodermis.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
On squeezing the nodule, larvae came out which provide tentative diagnosis for Hypoderma spp.
Keywords: Hypoderma bovis, Hypoderma lineatum, Oestridae, mitochondrial DNA and sequencing.
The commercial ELISA kit developed for bovine hypodermosis can be considered as a useful tool for the serodiagnosis of goat warble fly infestation due to the confirmed cross-reactivity between the antigen of Hypoderma lineatum and anti-P.
(2005), level as10% of antihypoderma antibody in adults of reindeer declined significantly with age, and levels were significantly lower in animals of 4 to 11 years of age than in one year old animals during the same one year period indicating reducing exposure of animals to hypoderma infestation.
However, in cases of internal ophthalmomyiasis caused by larvae from other species such as Hypoderma, the larvae can penetrate the sclera and burrow into subretinal space leading to iridocyclitis, endophthalmitis or loss of vision4.
Effect of temperature on pupal development and eclosion dates in the reindeer oestrids Hypoderma tarandi and Cephenemyia trompe (Diptera: Oestridae).
Hypoderma diana (Diptera, Oestridae) and Lipoptena cervi (Diptera, Hippoboscidae) as parasites of reindeer (Rangifer tarandus) in Scotland with notes on the second stage larva of Hypoderma Diana.
Caribou maximize their nutritional intake through large-scale migratory movements to areas of higher habitat quality, changes in seasonal and annual distribution in response to changes in plant phenology and availability, and rapid movements to limit harassment by the mosquito (Culex spp.) and oestrid fly (Hypoderma spp.
The "Gadfly" is more commonly known in the farming community as the "Warble Fly" ( Hypoderma bovis or Hypoderma lineata.
The survey, carried out by the Veterinary Laboratories Agency between November 2002 and March 2003 and to be published in the Veterinary Record, involved taking serum samples from 200,769 animals in 5,189 herds, to see if there was any evidence of antibodies to the cattle warble flies, Hypoderma lineatum and Hypoderma bovis.