• Category
  • Length Range
    16.6-24.4 µm
  • Width Range
    3.2-4.0 µm
  • Striae in 10 µm
    25-28

Identification

Description

Valves are narrowly linear to linear-lanceolate and slightly dorsiventral. Dorsal and ventral margins are weakly convex. The apices are rostrate and deflected slightly to the ventral side. The axial area is narrow and located near the apical axis. The central area is very small, barely wider than the axial area. The raphe is filiform. Proximal raphe ends are unexpanded and deflected toward the dorsal margin. Distal raphe fissures are hooked toward the ventral margin. Striae are weakly radiate to parallel.

Autecology

Encyonopsis anacondae is known only from Upper Seymour Lake in the Anaconda Range of southwest Montana (photo below). Upper Seymour Lake lies at an elevation of 2512 m and has circumneutral water with low dissolved solids.

Upper Seymour Lake
Credit: panoramio.com
Upper Seymour Lake, Anaconda-Pintler Wilderness, Deer Lodge County, Montana: type locality of Encyonopsis anacondae.

Original Description

Valves narrowly linear to linear-lanceolate, slightly dorsiventral. Dorsal and ventral margins weakly convex. Valve length 16.6–24.4 µm; valve width 3.2–4.0 µm. Apices rostrate, deflected slightly to the ventral side. Axial area narrow, near valve median line. Central area very small, barely wider than the axial area. Raphe filiform. Proximal raphe ends unexpanded, deflected toward the dorsal margin. Distal raphe fissures hooked toward the ventral margin. Striae weakly radiate, 25–28 in 10 µm.

  • Author
    Bahls 2013
  • Length Range
    16.6-24.4 µm
  • Width
    3.2-4.0 µm
  • Striae in 10µm
    25-28

Original Images

Encyo Anacondae Origimag Cropped
Encyo Anacondae Origidesc001

Cite This Page

Bahls, L. (2013). Encyonopsis anacondae. In Diatoms of North America. Retrieved February 28, 2025, from https://diatoms.org/species/49294/encyonopsis_anacondae