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Hsuum gratum

Protozoa - Nassellaria - Hsuidae

Discussion

Original description: Test wide, subconical to subcylindrical in shape, with well-developed horn. Cephalis and thorax sparsely perforated with short ridges, covering with layer of microgranular silica. All but final post-abdominal chamber gradually increasing in width and length as added. Final post-abdominal chamber decreasing in width. Abdomen and post-abdominal chambers consisting of square to rectangualr pore frames with long costae superimposed between everyone or two rows of pore frames. Costae with short, transverse elements.

Original remarks: Hsuum gratum n. sp. differs from H. acutum n. sp. by having a wider subconical test, and by having thinner, more regular costae on the earlier chambers.

Etymology: Gratus-a-um (Latin, adj.) pleasing.

Taxonomy
Hsuum gratum was named by Yeh (1987). Its type specimen is NMNS (000087) and is a 3D body fossil. Its type locality is Suplee-Izee area, OR-600A, which is in a Toarcian marine tuff/limestone in the Hyde Formation of Oregon.

Synonymy list
YearName and author
1987Hsuum gratum Yeh p. 65 figs. Pl. 16, figs. 7, 13, 18, 21

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RankNameAuthor
—Life
—Eukaryota()
classProtozoaGoldfuss 1820
subphylumSarcodinaSchmarda 1871
classReticulareaLankester 1885
subclassRadiolaria(Müller 1858)
RankNameAuthor
superorderPolycystina(Ehrenberg 1838)
orderNassellariaEhrenberg 1875
superfamilyArchaeodictyomitraceaPessagno 1976
familyHsuidae
genusHsuumPessagno 1977
speciesgratum

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.

†Hsuum gratum 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: Early/Lower Toarcian or 184.20000 to 182.90000 Ma

Collections (3 total)


Time interval Ma Country or state Original ID and collection number
Early/Lower Toarcian184.2 - 182.9Japan Hsuum gratum (124830)
Early/Lower Toarcian184.2 - 182.9USA (Oregon) Hsuum gratum (type locality: 124328 124331)