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(invertebrate zoology)
A forked process as the last abdominal segment of certain crustaceans, and as part of the spring in collembolans.
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 It might be outdated or ideologically biased.



special organs in some insects and crustaceans.

(1) A part of the internal chitinous skeleton of an insect thorax, also known as apophysis. The furca projects into the body in the form of a furcate outgrowth (on the ventral side of the thoracic segments), to which muscle tendons are attached.

(2) A springing organ of insects of the order Collembola, also known as furcula. The furca consists of a pair of out-growths grown together at their base on the ventral side of the fourth abdominal segment. When at rest these outgrowths are folded under the abdomen and secured to a special outgrowth on the third abdominal segment. The furca can unfold downward and backward with force, and when it strikes the ground, it can propel the insect into the air.

(3) A pair of appendages at the end of the last abdominal segment in some crustaceans, such as copepods.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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References in periodicals archive ?
Repair of furcal perforations with mineral trioxide aggregate: two case reports.
The use of Biodentinetm for repair of furcal perforations is associated with a good short-term clinical outcome.
lividus have three minute outer spines on the furcal arms of the telson, while there are only two in the Pacific population.
The Furcal deal comes on the heels of an eight-player swap with the Toronto Blue Jays on Wednesday that brought starting pitcher Edwin Jackson, relievers Marc Rzepczynski and Octavio Dotel and outfielder Corey Patterson to St.
Las relaciones biometricas se realizaron a traves de la aplicacion del modelo de regresion lineal (LT=a+b (LF); LT=a+b (LPC), donde: LT=Longitud total, LF=Longitud furcal, LPC=Longitud precaudal, a=ordenada al origen, b=pendiente).
The Dodgers then loaded the bases in the sixth to give themselves the opportunity of taking the lead but shortstop Rafael Furcal grounded out.
Nymphs of Cultus can be separated from other North American Perlodinae genera by the combination of the following characters; lacinia bidentate with few marginal setae, pronotal setae restricted to 2-3 at corners, and mesosternal Yarms well developed, reaching posterior corners of furcal pits, transverse suture connecting furcal pits absent (Stewart and Stark, 2002).