Two New Otolith-Based Sciaenid Species of the Genus Plagioscion From South American Neogene Marine Sediments

Aguilera, Orangel; Aguilera, Dione Rodrigues de

doi:10.1666/0022-3360(2003)077<1133:tnosso>2.0.co;2

Cited by 14 publications

(9 citation statements)

References 8 publications

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“…A mounting body of evidence has now been presented for a long persistent, large river system originating far south in western Amazonia that flowed north in the Andean foreland basin (Hoorn, 1993(Hoorn, , 1994Hoorn et al, 1995;Lundberg et al, 1998). This "Paleo-AmazonOrinoco" river system would have contained a common freshwater fauna including fish species represented as fossils from Urumaco (Aguilera & Rodrigues de Aguilera, 2003;Sánchez-Villagra et al, 2003). At times marine and estuarine conditions extended southward into the Andean foreland basin from the Caribbean (Hoorn, 1994 a, b, c;Monsch, 1998) thus providing some opportunities for marine taxa to penetrate far into the South American continent (Lovejoy et al, 1998).…”

Section: Discussionmentioning

confidence: 99%

The late Miocene Phractocephalus catfish (Siluriformes: Pimelodidae) from Urumaco, Venezuela: additional specimens and reinterpretation as a distinct species

Lundberg¹,

Aguilera

2003

Neotrop. ichthyol.

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Based on additional specimens the fossil pimelodid catfish from the upper Miocene Urumaco Formation, Falcón State, Venezuela originally assigned to the extant species Phractocephalus hemioliopterus is described as a new, extinct species. †Phractocephalus nassi n. sp. is diagnosed by the following combination of characters: 1) posterior half of frontals and anterior half of supraoccipital with elongate, coarse ridges and sulci in addition to reticulating ridges and subcircular pits; 2) very broad and ornamented mesethmoid bone; 3) lateral ethmoid margin convex and eliminating orbital notch but not projecting far anteriorly over palatine condyle; 4) anterior cranial fontanelle closed or represented by a small pit; 5) supraoccipital process rounded laterally and posterolaterally, concave posteriorly and completely concealing Weberian complex in dorsal view; 6) opercle covered with reticulating ridges and pits; 7) cleithrum coarsely ornamented along ventral edge and bulging outward lateral to spine articulation; 8) pectoral spine mostly ornamented with coarse ridges and sulci. †Phractocephalus nassi is compared to modern P. hemioliopterus and an undescribed extinct species from the upper Miocene Solimões Formation, Acre, Brazil. New diagnostic characters of Phractocephalus are presented that apply to the modern and fossil species, including: 1) ornamentation of skull, pectoral girdle and fin spines comprising a coarse meshwork of reticulating ridges surrounding rounded pits plus some elongate ridges and sulci; 2) supraoccipital posterior process greatly expanded laterally and posteriorly behind occipital wall; 3) lateral ethmoid and sphenotic broadly sutured behind eye; 4) anterior cranial fontanelle reduced or completely closed and posterior cranial fontanelle closed; 5) vomerine tooth plate large, roughly pentagonal to triangular in form, and with fine teeth. Today Phractocephalus ranges widely throughout the lowland Orinoco, Amazon and Essequibo basins. However, the genus does not occur west or north of the Andes or Venezuelan coastal ranges. Recognizing the Urumaco Phractocephalus as a distinct species does not alter the obvious conclusion that this catfish marks a large river connection between the Caribbean coastal region and the Orinoco system during at least part of the Neogene. Other Urumaco fossils show this same biogeographic relationship.É descrita uma nova espécie fóssil de bagre pimelodídeo proveniente da Formação Urumaco do Mioceno superior no estado Falcón, Venezuela. O exemplar fóssil foi originalmente atribuído a espécie recente Phractocephalus hemioliopterus. Porém, com base em exemplares fósseis adicionais provenientes da Formação Urumaco, essa espécie extinta é descrita como uma nova espécie. As características diagnósticas da nova espécie †Phractocephalus nassi são as seguintes: 1) a metade posterior do frontal e a metade anterior do supraocciptal apresentam uma ornamentação caracterizada por altos relevos e sulcos alongados, assim como reticulações e algumas depressões subcirculares; 2) o mese...

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Section: Discussionmentioning

confidence: 99%

The late Miocene Phractocephalus catfish (Siluriformes: Pimelodidae) from Urumaco, Venezuela: additional specimens and reinterpretation as a distinct species

Lundberg¹,

Aguilera

2003

Neotrop. ichthyol.

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“…The presence of Plagioscion in the Rio Magadalena extends this age to the Middle Miocene, as was the case for Potamotrygonidae. Fossil Plagioscion otoliths have been reported by Monsch (1998) from Middle Miocene deposits of the Pebas Formation and by Aguilera and Rodrigues de Aguilera (2003) from Neogene marine sediments of Venezuela. Available fossil and biogeographic data appear to support Boeger and Kritsky's (2003) hypothesis that Plagioscion evolved sometime in the Early Miocene, probably in association with marine transgressions from western Venezuela that extended to the upper Amazon.…”

Section: Drumsmentioning

confidence: 95%

Miocene marine incursions and marine/freshwater transitions: Evidence from Neotropical fishes

Lovejoy

Albert

Crampton

2006

Journal of South American Earth Sciences

172

168

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“…This river system would have contained a common freshwater fauna, including fish species represented as fossils in Falcón Basin Miocene rocks and from the Acre region in southwestern Amazonia (Aguilera, 1994;Aguilera and Rodrigues de Aguilera, 2003;Lundberg and Aguilera, 2003;Sánchez-Villagra et al, 2003;Sánchez-Villagra and Clack, 2004;Sánchez-Villagra and Aguilera, 2006;Sabaj Pérez et al, 2007). These fossils include large specimens of the distinctive pimelodid catfish genus Phractocephalus, such as P. nassi from the late Miocene Urumaco Formation in the Falcón Basin (Lundberg and Aguilera, 2003).…”

Section: Discussionmentioning

confidence: 99%

The Oligocene-Miocene Transition on Coral Reefs in the Falcon Basin (Nw Venezuela)

Johnson

Sánchez‐Villagra

Aguilera

2009

PALAIOS

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Two New Otolith-Based Sciaenid Species of the Genus Plagioscion From South American Neogene Marine Sediments

Cited by 14 publications

References 8 publications

The late Miocene Phractocephalus catfish (Siluriformes: Pimelodidae) from Urumaco, Venezuela: additional specimens and reinterpretation as a distinct species

The late Miocene Phractocephalus catfish (Siluriformes: Pimelodidae) from Urumaco, Venezuela: additional specimens and reinterpretation as a distinct species

Miocene marine incursions and marine/freshwater transitions: Evidence from Neotropical fishes

The Oligocene-Miocene Transition on Coral Reefs in the Falcon Basin (Nw Venezuela)

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