paragnath


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paragnath

[′par·əg‚nath]
(invertebrate zoology)
One of the paired leaflike lobes of the metastoma situated behind the mandibles in most crustaceans.
One of the paired lobes of the hypopharynx in certain insects.
One of the small, sharp and hard jaws of certain annelids.
References in periodicals archive ?
In the following page, Claparede (1868: 478) referred to the paragnath pattern in the pharynx and explained the etymology: "L'article basilaire de la trompe est renfle sur le dos en deux eminences portant quelques paragnathes plus gros que ceux des autres groups.
splendida due to the paragnath patterns of their pharynx: area VI with 4(-5) paragnaths in a group, and he indicated that his species was coincident with N.
For the third option, and its combinations, it must be reminded that two paragnath patterns in area VI are included under N.
Additionally, area VI has 4-10 paragnaths in two transverse series, and areas VII-VIII have paragnaths in 3-4 series.
Proboscis area I lacks paragnaths, area II with 8-10, area III with 1 large and 2 small paragnaths, area IV with 8-9.
There are 2 or 3 paragnaths in area VI and none in areas VII-VIII.
Paragnaths I = 2-4 in a line, II = 23-29, III = 21-41, IV = 34-38, V = 0, VI = 7-13, VII & VIII = 7 in a single line.
Diagnosis: The presence of paragnaths on all areas of the pharynx and transverse bars on area VI place this in the genus Perinereis.
The number of parapodia, biomass and length are widely variable; however, the paragnath number and their arrangement in four pharyngeal areas (V:I, VI:4, VII-VIII: >30) is remarkably stable.
Nereis Linnaeus is set apart from other nereidids because it has conical paragnaths in both pharyngeal rings and homogomph falcigers in posterior setigers (Wu et al.
Paragnaths in the following arrangement: I:15 cones in a group, II:32 median cones forming 2-3 lines in an arc, III:45 small and median cones in a rectangle, IV:36 small and median cones in 4 lines, V:1 large cone, VI:4 large cones in a diamond, VII-VIII: > 30 large cones in two irregular rows (Fig.
(1992) studied the role of "the anterior mouthparts" (Md, Mx1, Mx2, Mxp1, Lb, and paragnaths) in the penaeid prawn Penaeus merguiensis.