Bistarkum bifurcum Yeh 1987 (radiolarian)

Polycystina - Spumellaria - Angulobracchiidae

Description: Ray shafts relatively narrow, subequal in length, terminating in long bifurcating tips. Tips usually four times as wide as ray shafts. Several small spines occurring at sides of rays and distal surface of tips. Test comprised mainly of triangular and tetragonal pore frame. Pore frames small, with nodes at vertices.

Etymology: Bifurcus-a-um (Latin, adj.) having two prongs of forks.

Full reference: K. Y. Yeh. 1987. Taxonomic Studies of Lower Jurassic Radiolaria from East-Central Oregon. National Museum of Natural Science Special Publications 2:1-169

Belongs to Bistarkum according to K. Y. Yeh 1987

Sister taxa: Bistarkum brevilatum, Bistarkum coriniforme, Bistarkum cylindratum, Bistarkum martiali, Bistarkum phantomense, Bistarkum rhaeticum, Bistarkum rigidium, Bistarkum saginatum

Type specimen: NMNS (000043). Its type locality is Suplee-Izee area, OR-589D, which is in a Toarcian marine mudstone/limestone in the Snowshoe Formation of Oregon.

Ecology: passively mobile planktonic omnivore


• Jurassic of Oman (1 collection), United States (2: Oregon)

Total: 3 collections each including a single occurrence

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Specimen images are retrieved through the ePANDDA API.

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