Apical pore field

1. An area of small pores at the apices of the valves; the pores are usually arranged in longitudinal rows, otherwise similar to the ocellus of the centric diatoms (Hasle & Syvertsen, 1996).
2. A differentiated area of porelli at the apices of raphid and araphid pennate diatom valves (Round, Crawford, & Mann, 1990).
   

References

• Hasle, G.R. & Syvertsen, E.E., 1996. Marine Diatoms. In C.R. Tomas (ed), Identifying Marine Diatoms and Dinoflagellates. Academic Press, Inc., California. pp. 5-385.

• Round, F.E., Crawford, R.M. & Mann, D.G., 1990. The Diatoms: Biology and morphology of the genera. Cambridge: Cambridge University Press. 747 pp.

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