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Morphology | Ecology and taphonomy | External Literature Search | Age range and collections |
Lantus praeobesus
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.
Year | Name and author |
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2006 | Lantus praeobesus Gorican et al. p. 236 figs. Pl. LAN04 |
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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.