(redirected from furcae)
Also found in: Dictionary, Medical.


(invertebrate zoology)
A forked process as the last abdominal segment of certain crustaceans, and as part of the spring in collembolans.



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.

Mentioned in ?
References in periodicals archive ?
Furcae 154-230 (204 [+ or -] 26) long and 201-34 (27 [+ or -] 5) wide, with spines smaller than tail stem spines.
At resting position, the cercariae maintained themselves suspended in the water with their bodies directed downward, body and tail stem in a straight line and furcae spread at an angle of approximately 90[degrees] (Fig.
Furcae 126-149 (142 [+ or -] 5) long and 11-18 (14 [+ or -] 2) wide, with spines smaller than body spines.
According to Bray (1988), nonoculate cercariae carrying long trichocercous tails without furcae, with fin-like setae joined by a membrane and spinose tegument belong to the subfamily Baccigerinae Yamaguti, 1958.