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(invertebrate zoology)
The tadpole shrimps, an order of crustaceans generally referred to the Branchiopoda, having a cylindrical trunk that consists of 25-44 segments, a dorsoventrally flattened dorsal shield, and two narrow, cylindrical cercopods on the telson.
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 It might be outdated or ideologically biased.



a suborder of invertebrates of the order Phyllopoda. Almost the entire body is covered with a broad carapace. A pair of closely placed compound eyes and an unpaired simple eye are grouped in the front of the carapace. There are no fewer than 40 pairs of thoracic phylloid appendages, the first two pairs of which are equipped with long filiform tactile processes. The abdomen consists of many segments and ends in a pair of long filiform processes.

The Notostraca inhabit shallow bodies of fresh water that dry up seasonally. They feed on decaying organic remains, plants, and small animals. The females lay eggs into pouches on the 11th appendages and release the eggs on the bottom. The eggs can withstand high and low temperatures in the course of several years. Males are considerably less common than females.

The subphylum embraces nine genera. In the USSR the most common are Lepidurus apus, which measures as much as 12 mm in length, and Triops cancriformis, which measures as much as 7.5 cm in length. Some species serve as food for fish and swimming birds. Others are pests in rice fields, uprooting seedlings and eating shoots.

The Notostraca are considered very old. They have been in existence since the Triassic.


Beklemishev, V. N. Osnovy sravnitel’noi anatomii bespozvonochnykh, 3rd éd., vols. 1–2. Moscow, 1964.
Zhizrí zhivotnykh, vol. 2. Moscow, 1968.
Dogel’, V. A. Zoologiia bespozvonochnykh, 6th ed. Moscow, 1975.
The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Eastward range extension of the tadpole shrimp, Triops longicaudatus (Leconte), in Oklahoma.
longicaudatus as the only North American Triops species and on the basis of this treatment, specimens were identified as T.
Artemia franciscana and Triops longicaudatus cysts (Carolina Biologicals) were hatched and cultured in the laboratory.
One characteristic example is the tadpole shrimps (the notostracan crustaceans of the genus Triops, see figure 86, p.
Dodson (1987) lists five species of branchiopods in rock pools in Utah, two species each of Anostraca and Conchostraca, and Triops longicaudatus.
Although these taxa could have come from upstream perennial water sources, they also could have come from other sources, such as cryptobiotic states (e.g., the tadpole shrimp genus Triops) or the hyporheic zone, or as transients on birds and other wildlife (e.g., the leech E.
triops, Melanoplus sp., Osmilia flavolineata De Geer, T.
It is true, that after several negative tests carried out with substrates like ours, Trusheim (1931: 236) had finally obtained Triops cancriformis trackways by using "a natural calcareous mud Tubifex" with better results when he added "a fine algae and diatoms layer".
The invertebrate fauna is little known, but there are some remarkable crustaceans of the genus Imnadopsis and the tadpole shrimp Triops australiensis, which is thought to have existed in its current form for more than 150 million years.
Box 1632, Beaverton, OR 97075 at the airmail price of $36.00, and in Germany from TRIOPS Tropical Scientific Books), Raiffenstrasse 24, D-6070 Langen, FRG.
To explore the diversity in the heartbeat pacemaker mechanisms of crustaceans, we examined the electrophysiology of the heart of the primitive crustacean Triops longicaudatus (Notostraca, Branchiopoda).