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Lantus praeobesus

Protozoa - Nassellaria - Eucyrtidiidae

Discussion

Named by Carter.

Original description: Test broadly conical, usually with four to five post-abdominal chambers. Cephalis small, conical, usually without a rudimentary horn. Cephalis imperforate, thorax and abdomen sparsely perforate covered with a layer of microgranular silica. Post-abdominal chambers trapezoidal, rapidly increasing in width an added, final chamber closed with a large ellipsoidal cap. Pore frames on post-abdominal chambers polygonal increasing in size distally.

Original remarks: This species differs from Lantus obesus (Yeh) 1987 in having a shorter, less inflated final post-abdominal chamber with smaller pore frames, and in lacking a constriction between the final two chambers. L. praeobesus n. sp. is the oldest species of Lantus included in this catalogue; it first appears in the basal Pliensbachian and is abundant throughout the stage.

Hemicryptocephalis dengquensis Li is questionably synonymized with L. praeobesus n. sp. because the description of the former is unclear (see remarks under genus Lantus).

Etymology: From the Latin, prae (prefix) and obesus (adj.) before obesus.

Taxonomy
Lantus praeobesus was named by Gorican et al. (2006). Its type specimen is GSC 111725 and is a 3D body fossil. Its type locality is Maude Island, west of Ells Bay; GSC loc. C-304566, which is in a Pliensbachian marine limestone in the Fannin Formation of Canada.

Synonymy list
YearName and author
2006Lantus praeobesus Gorican et al. p. 236 figs. Pl. LAN04

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RankNameAuthor
Life
Eukaryota()
classProtozoaGoldfuss 1820
subphylumSarcodinaSchmarda 1871
classReticulareaLankester 1885
subclassRadiolaria(Müller 1858)
RankNameAuthor
superorderPolycystina(Ehrenberg 1838)
orderNassellariaEhrenberg 1875
superfamilyEucyrtidiaceaEhrenberg 1847
familyEucyrtidiidaeEhrenberg 1847
genusLantus
speciespraeobesus

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.

Lantus praeobesus Gorican et al. 2006
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Diagnosis
No diagnoses are available