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Bistarkum bifurcum

Protozoa - Spumellaria - Angulobracchiidae

Discussion

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.

Taxonomy
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
B. equalum

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

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RankNameAuthor
—Life
—Eukaryota()
classProtozoaGoldfuss 1820
subphylumSarcodinaSchmarda 1871
classReticulareaLankester 1885
RankNameAuthor
subclassRadiolaria(Müller 1858)
orderSpumellariaEhrenberg 1875
familyAngulobracchiidaeBaumgartner 1980
genusBistarkum
speciesbifurcum

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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Diagnosis
No diagnoses are available
Measurements
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 192.90000 to 182.90000 Ma

Collections (3 total)


Time interval Ma Country or state Original ID and collection number
Late/Upper Pliensbachian192.9 - 184.2USA (Oregon) Bistarkum bifurcum (124323)
Late/Upper Pliensbachian - Early/Lower Toarcian192.9 - 182.9Oman Bistarkum bifurcum (125209)
Early/Lower Toarcian184.2 - 182.9USA (Oregon) Bistarkum bifurcum (type locality: 124334)