Epithemia adnatavar. porcellus(Kutz.) Patr.

Length: 40.5

Width: 9


Costae: 3-4

Collection 1369

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Authority information

Epithemia adnata var. porcellus (Kutz.) Patr. comb. nov., Patrick and Reimer, pl. 24, fig. 6, 1975. (Patrick and Reimer 1975).

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The image of this specimen was captured using DIC. It helps to distinguish fine detail.

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The valve has a concave ventral margin and a convex ventral margin. The apices are narrow, turnicate to slightly capitate and sometimes a little reflexed. The raphe and costae ends are the same as Epithemia adnata: "The raphe is only apparent in the middle of the valve in valve view, curved towards dorsal margin. The central pores of the raphe are located below the mid-width of the valve. Poores in the central canal plate are indistinct. Distinct costae, in girdle view ends of costae indistinctly capitate or rounded." This taxon is most closely related to C. adnata var. proboscidea differing mainly in the apices, which are not as distinctly differentiated, and the length to breadth ratio3.7-4.1:1 rather than 5:1, it is also normally shorter than C. adnata var. proboscidea. (Patrick and Reimer 1975).

Type Locality

USA, New England states, Middle Atlantic states, Southeastern states, West Central states, Lake states; Arizona, California. (Patrick and Reimer 1975).


    Epithemia porcellus Kutz., Bacill., pl. 5, figs. 18,19. 1844 Epithemia zebra var. porcellus (Kutz.) Grun., Verh. Zool.-Bot. Ges. Wien, 12:328, pl. 6 (Grun. pl. 9), figs 3,4. 1862. Cytopleura zebra var. porcellus (Kutz.) DeT., Syll. Alg., vol. 2, sect. 2, p. 785. 1892 (Patrick and Reimer 1975).

Ecological distribution

Found in lakes, ponds, rivers, springs/streams, lagoons, oozing areas, thermal springs, swamps, and terrestrially. Acidobiontic, Acidophilous, indifferent, Alkaliphilous, Alkalibiontic. (Beaver 1981).

Size ranges and morphology

  • Length is 20 to 125 micrometers (Patrick and Reimer 1975).
  • Width is 8 to 14 micrometers (Patrick and Reimer 1975).
  • Costae are about 4 to 5 in 10 micrometers (Patrick and Reimer 1975).
  • Alveoli rows are 8 to 12 in 10 micrometers (Patrick and Reimer 1975).