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Bistarkum bifurcum

Protozoa - 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.

Bistarkum bifurcum was named by Yeh (1987). Its type specimen is NMNS (000043) and is a 3D body fossil. Its type locality is Suplee-Izee area, OR-589D, which is in a Toarcian marine mudstone/limestone in the Snowshoe Formation of Oregon.

Sister species lacking formal opinion data

Synonymy list
YearName and author
1987Bistarkum bifurcum Yeh p. 43 figs. Pl. 1, fig. 10; Pl. 22, figs. 5, 6

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classProtozoaGoldfuss 1820
subphylumSarcodinaSchmarda 1871
classReticulareaLankester 1885
subclassRadiolaria(Müller 1858)
orderSpumellariaEhrenberg 1875
familyAngulobracchiidaeBaumgartner 1980

If no rank is listed, the taxon is considered an unranked clade in modern classifications. Ranks may be repeated or presented in the wrong order because authors working on different parts of the classification may disagree about how to rank taxa.

Bistarkum bifurcum Yeh 1987
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No diagnoses are available
No measurements are available
Composition: silicap
Environment: marinep
Locomotion: passively mobilep
Life habit: planktonicp
Diet: omnivorep
Created: 2005-01-28 01:13:47
Modified: 2005-01-28 03:13:47
Source: p = phylum
Reference: Kiessling 1999

Age range: base of the Late/Upper Pliensbachian to the top of the Early/Lower Toarcian or 189.60000 to 182.00000 Ma

Collections (3 total)

Time interval Ma Country or state Original ID and collection number
Late/Upper Pliensbachian189.6 - 183.0USA (Oregon) Bistarkum bifurcum (124323)
Late/Upper Pliensbachian - Early/Lower Toarcian189.6 - 182.0Oman Bistarkum bifurcum (125209)
Early/Lower Toarcian183.0 - 182.0USA (Oregon) Bistarkum bifurcum (type locality: 124334)