Pyropelta seca, Kiel & Hybertsen & Hyžný & Klompmaker, 2020
|
publication ID |
https://doi.org/ 10.4202/app.00631.2019 |
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persistent identifier |
https://treatment.plazi.org/id/F104879E-3B2F-AD22-F66B-75E2FDF4FBFF |
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treatment provided by |
Felipe |
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scientific name |
Pyropelta seca |
| status |
sp. nov. |
Pyropelta seca View in CoL sp. nov.
Fig. 11 View Fig .
Zoobank LCID: urn:lsid:zoobank.org:act:005AF820-5BD6-42C1-9AE6-F1F03A3EC479
Etymology: For Quebrada Seca river valley.
Type material: Holotype: NRM Mo 187036 from Cerro La Salina block 6 . Paratypes: NRM Mo187035, 187037–187039 from block 6 .
Type locality: Cerro La Salina block 6, Talara Basin, Peru .
Type horizon: Early Oligocene part of the Heath shale.
Material.— The type material and a few further unnumbered specimens from Cerro La Salina blocks 6 and 9, and one unnumbered specimen from Cerros El Pelado block 2. All upper Oligocene, Talara Basin, Peru .
Dimensions (in mm).—The largest specimen, L = 2.5, H = 1.4.
Diagnosis.—Tall, oval to elongate-oval shell; apex with a slight forward inclination; shell with cone-in-cone layering, surface smooth; base flat to concave.
Description.—Small limpet shell, tall, posterior slope gently and irregularly convex, anterior slope irregular, more-orless straight; base oval to elongate-oval, flat or convex with lateral margins lower than anterior and posterior margins; apex in central or very slightly anterior position, slightly inclined towards anterior; shell surface smooth, with cone-in-cone layering.
Remarks.—Although the shell microstructure and protoconch are unknown, this species is placed in Pyropelta based on its cone-in-cone type layered shell. This type of layering is regularly seen in Pyropelta ( McLean and Haszprunar 1987; McLean 1992; Sasaki et al. 2003, 2008; Zhang and Zhang 2017) but not in other cocculiniform genera, and results from alternating layers with crossed lamellar or crossed acicular structure and prismatic structure ( Kiel 2004).
Compared to Pyropelta seca , Pyropelta elongata Zhang and Zhang, 2017 , from methane seeps in the South China Sea is similarly elongated, but not as tall ( Zhang and Zhang 2017). Pyropelta ryukyuensis Sasaki, Okutani, and Fujikura, 2008 , from hydrothermal vents in the Okinawa Trough ( Sasaki et al. 2008) is broader and less tall than Pyropelta seca . Even broader and lower are Pyropelta musaica and Pyropelta craigsmithi McLean, 1992 ; Pyropelta corymba McLean and Haszprunar, 1987 , is also broader but can be as tall as Pyropelta seca ( McLean and Haszprunar 1987; McLean 1992).
Stratigraphic and geographic range.—Early Oligocene of the Talara Basin, northern Peru.
| NRM |
Swedish Museum of Natural History - Zoological Collections |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.