The paleontology of the Zorritos formation of the north Peruvian oil fields, by Edmund M. Spieker.

Spieker, Edmund M.

doi:10.5962/bhl.title.22419

Cited by 4 publications

(11 citation statements)

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“…3A, B), with a less opisthogyrate umbo, and a rumored Peruvian Miocene species, likely Spieker's (1922) account of E. nelsoni (Grzybowski, 1899). Oddly, Stewart (1930) also implied that fossil American Eucrassatella lacked opisthogyrate umbones, a claim belied by the existence of the Miocene species E. berryi (Spieker, 1922) and E. elassa Woodring, 1982 (Fig. 3C, D).…”

Section: Resultsmentioning

confidence: 99%

“…They do not reside in the collections of his home institution, the Jagiellonian University in Kraków (Jolanta Gruza, personal communication 15 February 2016). Emended description based on illustrations of Nelson (1870) and Grzybowski (1899) and Spieker's (1922) specimen. Type locality: Caleta Grau, Peru.…”

Section: Resultsmentioning

confidence: 99%

“…By reason of this character suite (Table 1) and associated characters described in the systematics section, a new genus is proposed for Philippi's (1887) species and two new species from southern Peru: Tilicrassatella gen. nov., with the type species designated as Crassatella ponderosa Philippi, 1887. (Spieker, 1922), USNM 562399, early Miocene, lower Zorritos Formation, Zorritos, Peru; exterior of left valve (C 1 ), dorsal view of paired valves (C 2 ), anterior at right. D. Hybolophus elassa Woodring, 1982, USNM 647424, late Miocene, Gatun Formation, Panama; exterior of left valve.…”

Section: Resultsmentioning

confidence: 99%

“…Type horizon: Miocene, indeterminate formation. Material.-USNM 562398, ridge at head of Quebrada Heath, northern Peru (Spieker 1922).…”

Section: Resultsmentioning

confidence: 99%

“…The bivalve subfamily Crassatellinae Férussac, 1822, is represented on the west coast of South America by two living species, Eucrassatella gibbosa (Sowerby, 1832) and E. antillarum (Reeve, 1842), and up until now, one Eocene species (Olsson 1931); Miocene, Pliocene, and Pleistocene species in northern Peru and Ecuador (Spieker 1922;Olsson 1932;Marks 1951;DeVries 1986); and one early Miocene species in Chile (Philippi 1887). Discoveries of new fossil species in Peru provide an opportunity to re-examine systematic relationships among American crassatellines and between American and Australian/New Zealand crassatellines.…”

Section: Introductionmentioning

confidence: 99%

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Revisión de la Subfamilia Crassatellinae (Bivalvia: Crassatellidae) del Paleógeno—Neógeno de Argentina

Santelli

Río

2014

Ameghiniana

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

“…Type horizon: Miocene, indeterminate formation. Material.-USNM 562398, ridge at head of Quebrada Heath, northern Peru (Spieker 1922).…”

Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Revisión de la Subfamilia Crassatellinae (Bivalvia: Crassatellidae) del Paleógeno—Neógeno de Argentina

Santelli

Río

2014

Ameghiniana

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Diversity and preserved shell coloration patterns of Miocene Conidae (Neogastropoda) from an exposure of the Gatun Formation, Colón Province, Panama

Hendricks

2018

J. Paleontol.

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Extant members of the neogastropod family Conidae (cone snails) are renowned for their often dazzling shell coloration patterns and venomous feeding habits. Many cone snail species have also been described from the fossil record, but to date have been little used to understand the evolutionary history of extant clades. The cone snail fauna of the Miocene Gatun Formation of Colón Province, Panama is especially important for understanding the temporal and biogeographic history of tropical American Conidae. Intensive, focused collecting from an exposure of the lower Gatun Formation (deposited ca. 11–10 Ma) resulted in the discovery of nearly 900 specimens of Conidae. Remarkably, many of these well-preserved specimens exhibit revealed coloration patterns when exposed to ultraviolet light. The fluorescing coloration patterns were used in conjunction with other features of shell morphology to differentiate species and, in most cases, evaluate their potential relationships to members of the extant tropical American fauna. Nine species are fully described from this locality, one of which is recognized as new:Conus(Stephanoconus)woodringin. sp. At least one, and perhaps more, additional Conidae species are also present at the study locality. The diversity of this Conidae fauna is considered moderate relative to other recently analyzed tropical American fossil assemblages. The phylogenetic diversity of the assemblage, however, is noteworthy: six of the ten species can be confidently assigned to six different clades of extant Conidae, providing potentially useful calibration points for future phylogenetic studies.http://zoobank.org/8fe00c31-8f3f-4514-85af-29068e468cd3

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When domes are spandrels: on septation in turritellids (Cerithioidea) and other gastropods

Anderson

Allmon

2018

Paleobiology

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Although generally considered rare in gastropods, septation has long been noted in turritellids, but functional hypotheses do not survive strong scrutiny. Here we outline a methodology for testing spandrel hypotheses and apply it to the problem of turritellid septa. We follow Gould in using “spandrel” as a term for all features that are nonadaptive sequelae of adaptive features of organisms, including those that are structurally necessary, those that are developmentally correlated, and nondeterministic by-products that are correlated to features under selection.In turritellids, septa are constructed in microstructural continuity with secondary internal thickening of the shell, are highly variable features infraspecifically, and are strongly associated with degree of shell thickening. We therefore conclude that rather than being themselves adaptive, turritellid septa are spandrels of shell thickening. Turritellid septa are composed of crossed lamellar aragonite, which appears to be constructed by mantle epithelium over the visceral mass. Septation was also found in 22 of 24 gastropod families examined from a broad phylogenetic distribution. Septa thus appear to be a widespread feature of caenogastropods, in strong contrast to previous assertions that septa are less common in modern or high-spired shells.

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The paleontology of the Zorritos formation of the north Peruvian oil fields, by Edmund M. Spieker.

Cited by 4 publications

References 0 publications

Revisión de la Subfamilia Crassatellinae (Bivalvia: Crassatellidae) del Paleógeno—Neógeno de Argentina

Revisión de la Subfamilia Crassatellinae (Bivalvia: Crassatellidae) del Paleógeno—Neógeno de Argentina

Diversity and preserved shell coloration patterns of Miocene Conidae (Neogastropoda) from an exposure of the Gatun Formation, Colón Province, Panama

When domes are spandrels: on septation in turritellids (Cerithioidea) and other gastropods

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