Isotopic position

Isopolar

 

Isotype

Applies to some concentrically undulate species of Stephanodiscus (e.g., S. niagarae) where fultoportulae on the valve face are in the central area of both the concave and the convex valves. From Greek for “same place”.

See contrasting term, heterotopic position.


Citations

Håkansson, H. and Meyer, B. (1994). A comparative study of species in the Stephanodiscus niagarae-complex and a description of S. heterostylus sp. nov. Diatom Research 9(1): 65-85. 10.1080/0269249X.1994.9705288

Houk, V., Klee, R. and Tanaka, H. (2014). Atlas of freshwater centric diatoms with a brief key and descriptions Part IV. Stephanodiscaceae B: Stephanodicsus, Cyclostephanos, Pliocaenicus, Hemistephanos, Stephanocostis, Mesodictyon & Spicaticribra. In: Poulícková, A. (ed.): Fottea 14 Supplement, 529 pp.