antapex


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Noun1.antapex - the point opposite in direction from the solar apexantapex - the point opposite in direction from the solar apex; the point the solar system is moving away from
celestial point - a point in the heavens (on the celestial sphere)
apex of the sun's way, solar apex, apex - the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars
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The antapex is rounded, and cells had well developed small knob-shaped posterior protrusions (Fig.
The abbreviations for cell measurements are as follows: Lb--body length measured from the furthest part of the epitheca to the antapex of the hypotheca, not considering appendages or processes (lists or spines); Lt--total length measured from the furthest part of the epitheca or the anterior cingular list to the furthest part of the posterior or posterior-lateral processes or lists; Db--maximum cell body depth measured in its widest part in lateral view, not considering the sulcal or cingular lists; Dt--total depth, considering the sulcal and/or cingular lists.
Sulcus expanding to P umbonatum antapex, epitheca > hypotheca 6b.
LSL is long and narrow, ending relatively close to the antapex, with barely visible supporting ribs.
Horiguchi & Pienaar (1991) have described some variation in cell shape from diamond to ovoid, and also some variation in the sulcus to antapex length in this species, related to the development of the intercalary bands.