biramous


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biramous

[bī′rā·məs]
(biology)
Having two branches, such as an arthropod appendage.
References in periodicals archive ?
Immediately after hatching, the first free-living zoea larval stage is characterized by three pairs of well-developed thoracic biramous maxillipeds located immediately posterior to the cephalic maxillary appendages (St.
Segments 2-9 with biramous parapodia, with 5-12 simple chaetae per rami, and filiform and smooth interramal cirri.
Sex was determined by the presence of biramous pleopods in females and uniramous pleopods in males (Morgan 1980).
The first pedigerous somite is cephalically incorporated and the three succeeding free pedigerous somites each bear a pair of biramous swimming legs.
Four pairs of biramous swimming legs composed of a precoxa, coxa, basis, exopod, and endopod; with plumose setae on all exopods, endopods, coxae, and bases.
Crab sex was determined as follows: females have a gonopore on the coxa of each third pereopod and elongated biramous pleopods, whereas males have a gonopore on the coxa of each fifth pereopod and short uniramous pleopods.
The biramous antennules of decapods, in particular, are considered the primary sensory organs for olfactory chemoreception and exclusively contain, on the outer flagellum, the aesthetasc sensilla, each innervated by hundreds of olfactory receptor neurons (Schmidt and Mellon, 2011 ).
Segments 4 and 5 of the male abdomen are partly fused, whereas the mature female abdomen is broad with free segments and biramous pleopods on segments 2-5.
All thoracic parapodia biramous; thoracic postchaetal lobes of both rami inconspicuous.