venation


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ve·na·tion

(vē-nā'shŭn),
The arrangement and distribution of veins.
[L. vena, vein]
Farlex Partner Medical Dictionary © Farlex 2012

venation

(vē-nā′shŭn)
The distribution of veins to an organ or structure.
Medical Dictionary, © 2009 Farlex and Partners

venation

  1. (in insects) the arrangement of veins in the wing.
  2. (in plants) the arrangement of leaf veins.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005
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References in periodicals archive ?
Forewings transparent, basal cell large, costal area present (Pc+CP separated from CA), costal area lacking crossveins; forewing venation (Figs.
Also, none of the three species of Lomatia recognised from early Eocene, middle Eocene and late Oligocene-early Miocene sediments in Argentina (reviewed by Gonzalez et al., 2007) were described with the support of cuticular evidence, and leaves with similar bipinnatisect/imparipinnate architecture and venation occur elsewhere in Proteaceae.
This finding prompted a broadening of the scope of this contribution to include data on intra-specific wing venation variability in extant species, in order to assist delimitation of related fossil species.
Venation and setulae: Wing proportion 2.23, crossvein proportion 1.55-1.75.
Contributions to the morphology of Tectaria: venation pattern of sterile and fertile leaves.
Of the 25 remaining species, 12 present caeciliusid venation, including the amber fossil species M.
The Charaxidae (RYDON, 1971; SALAZAR & CONSTANTINO, 2001) is a group of tropical cosmopolitan butterflies that can be distinguished, according to ACKERY, DE JONG and VANE-WRIGHT (1999), due to the shared characteristic homologous conditions: partial parapatagia or entirely sclerotized and shortly anastomosed Rs3 and Rs4 venation (RYDON, 1971).
Key words: Fagaceae, leaf venation pattern, Quercus, stomates.
The genitalia and wing venation were examined in 60% euparal solution or dried condition, respectively.
Thorax black; pronotum black, hexagonal, with a median carina strongly marked; pronotum with anterior margin straight, lateral-anterior margins straight, lateral posterior margin slightly sinuous, posterior margin grooved; scutellum brownish with slight central concavity, with horizontal grooves strongly marked; tegmina black, apical plexus of veins developed; hindwings hyaline with dark brown venation, vein Cu1 not thickened at base; legs black; metathoracic tibia with two lateral spines (basal spine equal in size to spines in apical crown; apical spine larger than spines in apical crown); apical crown of spines on tibia consisting of two rows; basitarsus with two rows of spines covered by long setae; subungueal process present and quadrangular.