Search results
Results from the WOW.Com Content Network
The chalaza (/ k ə ˈ l eɪ z ə /; from Ancient Greek χάλαζα (khálaza) 'hailstone'; pl.: chalazas or chalazae / k ə ˈ l eɪ z i /) is a structure inside bird eggs and plant ovules. It attaches or suspends the yolk or nucellus within the larger structure.
Invoking images of the open ocean's surface, the imagination can conjure up an endless empty space. A flat line parting the blue below from the blue above. But in reality a diverse array of species occupy this unique boundary layer. A tangle of terms exist for different organisms occupying different niches of the ocean's surface.
A pair of Macroolithus eggs. Macroolithus eggs are characterized by large size, measuring 16 to 21 cm (6.3 to 8.3 in) long, and by their particularly coarse ornamentation. [1] [2] Their microstructure is not well defined in the literature, [1] but generally follows the typical elongatoolithid pattern: [2] The eggshell is arranged into two structural layers (the mammillary layer and the ...
Six small non-avian dinosaur eggs, no bigger than grapes, were discovered during a field study in Ganzhou, China, in 2021. These eggs now mark the smallest-ever found in the world.
addled eggs Also, wind eggs; hypanema. [5] Eggs that are not viable and will not hatch. [6] See related: overbrooding. afterfeather Any structure projecting from the shaft of the feather at the rim of the superior umbilicus (at the base of the vanes), but typically a small area of downy barbs growing in rows or as tufts.
Stolon – A branch that forms near the base of the plant, grows horizontally, and roots and produces new plants at the nodes or apex. Stoloniferous – plants producing stolons. Semi-erect – Not growing perfectly straight. Suffrutescent – somewhat shrubby, or shrubby at the base. Upright – Growing upward.
The eggs are usually few in number, and the embryos have enough food to go through full fetal development in most groups. [7] Macrolecithal eggs are only found in selected representatives of two groups: Cephalopods and vertebrates. [7] [22] Macrolecithal eggs go through a different type of development than other eggs.
The micropyle is situated on top in eggs which are globular, conical, or cylindrical; in those eggs which are flattened or lenticular, the micropyle is located on the outer margin or rim. [18] [62] The eggs of Lepidoptera are usually rounded and small (1 mm) though they may be as large as 4 mm in the case of Sphingidae and Saturniidae.