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| − | # Abaxial - directed away from or far from shell axis.
| + | | [[Foraminifera]] | [[Feeding strategies]] | [[Benthic foraminifera]] | [[Planktic foraminifera]] | |
| − | # Aboral - opposite to apertural [oral] end.
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| − | # Accessory aperture (infralaminal aperture, auct.) - opening that does not lead directly into the main chamber lumen, but extends beneath accessory structures (e.g. in bullae). 100/7,8.
| + | [[Image:GLOBEpredrotatet.gif]] |
| − | # Acicular - needle-shaped.
| + | |
| − | # Acicular spine - see spine.
| + | * marine, brackish and freshwater habitats |
| − | # Acuminate - tapering, i.e. getting thinner or pointed; conical.
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| − | # Acute - shape with acute or sharp angles.
| + | * sea-floor ([[benthic foraminifera]]) and sea water column ([[planktic foraminifera]]) |
| − | # Adapertural depression (periapertural depression; cavity; apertural fissure, auct.) - space formed by a toothplate and separated by the latter partly or completely from the main chamber lumen. Interconnected adapertural depressions produce a canal. 115/4. 119/15. 120/7. 124/7.
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| − | # Adaxial - directed towards or positioned near the shell axis.
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| − | # Advolute chamber arrangement - in spirally coiled forms where chamber lumina in whorl cover laterally those of the preceding whorl to a considerable extent, but not entirely, on one or both sides. Compare: evolute, involute. 2/5,6.
| + | ---- |
| − | # Acervuline - chambers in irregular, clustered arrangement, as in Acervulina.
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| − | # Adauxiliary chamber - chamberlet arising from single radial stolon (additional in respect to apertures between proto- and deuteroconch) in the embryonic wall of orbitoidiform shells. Adventitious - produced by or with the help of foreign particles such as those forming an agglutinated test.
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| − | # Agamogony - asexual reproduction within the reproduction cycle, from the first mitotic division of the zygote to meiosis.
| + | see [http://ethomas.web.wesleyan.edu/marshweb/foramintro.htm Introduction to Marsh Foraminifera] by Elen Thomas |
| − | # Agamont - specimen grown from the zygote, producing either gamonts or schizonts in an asexual process involving apogamous nuclear divisions and/or meiosis. Foraminiferal agamonts, produced by a sexual reproduction, are microspheric (B - form).
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