Scutellum

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scutellum

[skü′tel·əm]
(botany)
A rounded apothecium with an elevated rim found in certain lichens.
The flattened cotyledon of a monocotyledonous plant embryo, such as a grass.
(invertebrate zoology)
The third of four pieces forming the upper part of the thoracic segment in certain insects.
(vertebrate zoology)
One of the scales on the tarsi and toes of birds.

Scutellum

 

one of the principal organs in the embryo of grasses of the family Gramineae. During seed sprouting, the scutellum secretes enzymes that make soluble the reserve substances of the endosperm that nourish the developing embryo. Some botanists regard the scutellum as a cotyledon, and others as a modified axis of the embryo.

References in periodicals archive ?
papei Buhl, 2011, in Buhl's (20116) key, but that species has more slender antennae, a longer and thinner scutellar spine, and longer marginal cilia of wings.
Similar patterns of scutellar development were observed in the field study of Wright's skullcap.
It is differentiated from the rest of South American species by this feature, by presenting the scutellar disc smooth and flat, and the spine extremely short (Fig.
1], the later producing the highest numbers of globular, early, and late scutellar embryoids.
A second, analogous example concerns changes in the number of scutellar bristles caused by the mutant scute of Drosophila melanogaster (Rendel 1979).
They were associated by the pigmentation of thorax and legs and by the number of scutellar setae.
Scutellar amylase activity in naturally aged accelerated aged wheat seeds.
Mesoscutellum uniformly coriaceous, with transverse depression anteriorly, scutellar foveae separated by median carina (in some paratypes median carina absent).
Among the eight genera known in the tribe Hoplinini, the new genus Cuscohoplininus resembles Parajalysus in general aspect and size, but can be easily distinguished by the following characters: Parajalysus is characterized by the four large, erect pronotal spines, one centered on the anterior lobe, and on the posterior lobe, one at each humeral angle and one at the base of the meson; whereas, Cuscohoplininus has a single spine on the anterior pronotal lobe, an elongate scutellar spine (a tubercle is present in Parajalysus), and lacks a process on the caudal edge of the male genitalia capsule.