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n. pl. ligu·lae (-lē′) or ligu·las
A strap-shaped or tonguelike structure, especially the terminal portion of the labium in the mouthparts of certain insects.


a genus of tapeworms in the family Diphyllobothriidae.

Ligula intestinalis
the plerocercoids are found in the body cavity of freshwater fish, where they cause infertility and loss of condition. The adults are found in the alimentary tract of piscivorous birds.
References in periodicals archive ?
These 2 genera are hypothesized to be closely related as both share the same ecological character (habitat) and many morphological characters such as lacinia of maxilla without isolated spines in distal comb; labium with ligula divided into 2 lobes at base; 2 medial setae widely separated; lateral pseudopores absent on prementum; mesoventral process pointed at apex; legs relatively long; and empodial seta distinctly longer than claw.
5) with ligula protruded, parallel-sided, divided in apical three-fourths, almost as long as labial palpomere 1, labial palpus with two palpomeres, palpomere 1 longer than 2, one medial seta present on prementum, medial pseudopore field of prementum narrow and without pseudopore, mentum not emarginated in anterior margin.
When the Tyne Anglers Alliance supplied the EA with the necessary samples they were found to contain the tape worm ligula ( and permission was refused.
IF) with conspicuous mentum and prementum; mentum about as long as wide, with 2 pairs of setae and prementum with 1 pair of setae and 1 pair of sensilla; ligula rounded anteriorly, 1 pair of setae and microtrichia anteriorly; labial palpi 2-segmented and widely separated at base.
2F) with conspicuous mentum and prementum; mentum about as long as wide, with 3 pairs of setae, prementum with 3 pairs of setae; ligula transverse, with anterior microtrichia; labial palpi 2 segmented.
Ligula magma, auriculata manifeste; pulvinus residuus triangularis, persistens, ca 2 cm longum et 1.
8) consisting of distinctly separated prementum, mentum, and submentum; ligula elongate, labial palps with 2 articles, article 1 about 2.
Urogomphus shorter than tergite X, cylindrical; conical ligula much longer than 1st labial palpomere; mala with 3 setae on apex C.
49, conical ligula reaching end of labial palpomere 1, pubescent at base.
REMARKS: This species can be distinguished from other Cafius species by the combination of the following features: 2nd antennomere as long as 3rd, mala longer than lacinia, 2 articled urogomphi, 1st article of urogomphi as long as tergite X, conical ligula subequal to 1st labial palpomere, and mandible without serration.
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