Porca

Polar bar

 

Pore field

A transapical undulation, or elevated ridge, of the external valve face. The porca is particular to the genus Surirella. Plural form is porcae.


Alternative Term

ridge surface

corrugation ridge

transapical valve undulation

Citations

Bramburger, A.J., Haffner, G.D., Hamilton, P.B., Hinz, F. and Hehanussa, P.E. (2006). An examination of species within the genus Surirella from the Malili Lakes, Sulawesi Island, Indonesia, with descriptions of 11 new taxa. Diatom Research 21(1): 1-56. 10.1080/0269249X.2006.9705650

Karthick, B., Hamilton, P.B. and Kociolek, J.P. . (2012). Taxonomy and biogeography of some Surirella Turpin (Bacillariophyceae) taxa from Peninsular India. Nova Hedwigia, Beiheft 141: 81–116. 1438-9134/2012/0141 - 0081

Van de Vijver, B., Cocquyt, C., de Haan, M., Kopalová, K. and Zidarova, R. (2012). The genus Surirella (Bacillariophyta) in the sub-Antarctic and maritime Antarctic region. Diatom Research 28: 92-108. 10.1080/0269249X.2012.739975

Veselá, J., Johansen, J.R. and Potapova, M. (2013). Surirella terryi and S. cruciata: two rare diatoms in North America. Diatom Research . 10.1080/0269249X.2013.853697