Costinuculana magharensis n. gen. n. sp. (Bivalvia, Nuculanidae) from the Middle Jurassic of Gebel Maghara, North Sinai, Egypt

The nuculanid bivalve Costinuculana magharensis new genus new species is described from the middle to upper Bathonian Kehailia Formation of Gebel Maghara, North Sinai, Egypt. Costinuculana differs from other genera of the family Nuculanidae by the presence of opisthocline ribs along the rostrum. The...

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Veröffentlicht in:Journal of paleontology 2017-05, Vol.91 (3), p.434-443
Hauptverfasser: Ayoub-Hannaa, Wagih S, Abdelhady, Ahmad A, Fürsich, Franz T
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description The nuculanid bivalve Costinuculana magharensis new genus new species is described from the middle to upper Bathonian Kehailia Formation of Gebel Maghara, North Sinai, Egypt. Costinuculana differs from other genera of the family Nuculanidae by the presence of opisthocline ribs along the rostrum. These ribs are variable in shape and size, straight to folded posteriorly, bifurcate ventrally and occasionally postero-dorsally, and cover an area ~45% of the total valve length from the posterior end. The life position of C. magharensis n. gen. n. sp. is reconstructed on the basis of a functional interpretation of its morphology and by comparison with closely related Recent forms. The asymmetrical commarginal ribs facilitated the burrowing process. The posterior oblique ribs are asymmetrical in cross-section with a steeply concave side in the burrowing direction and slightly convex side in the opposite direction. They probably kept the bivalve in a stable position once the desired depth had been reached. The thick oblique ribs probably also increased the strength of the rostrum and offered resistance against durophagous predators, being presumably partly exposed above the sediment-water interface. Based on the associated fauna, Costinuculana n. gen. lived in a low-energy environment characterized by a fine-grained, soft substrate.
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(Bivalvia, Nuculanidae) from the Middle Jurassic of Gebel Maghara, North Sinai, Egypt</title><source>Jstor Complete Legacy</source><source>Cambridge University Press Journals Complete</source><creator>Ayoub-Hannaa, Wagih S ; Abdelhady, Ahmad A ; Fürsich, Franz T</creator><creatorcontrib>Ayoub-Hannaa, Wagih S ; Abdelhady, Ahmad A ; Fürsich, Franz T</creatorcontrib><description>The nuculanid bivalve Costinuculana magharensis new genus new species is described from the middle to upper Bathonian Kehailia Formation of Gebel Maghara, North Sinai, Egypt. Costinuculana differs from other genera of the family Nuculanidae by the presence of opisthocline ribs along the rostrum. These ribs are variable in shape and size, straight to folded posteriorly, bifurcate ventrally and occasionally postero-dorsally, and cover an area ~45% of the total valve length from the posterior end. The life position of C. magharensis n. gen. n. sp. is reconstructed on the basis of a functional interpretation of its morphology and by comparison with closely related Recent forms. The asymmetrical commarginal ribs facilitated the burrowing process. The posterior oblique ribs are asymmetrical in cross-section with a steeply concave side in the burrowing direction and slightly convex side in the opposite direction. They probably kept the bivalve in a stable position once the desired depth had been reached. The thick oblique ribs probably also increased the strength of the rostrum and offered resistance against durophagous predators, being presumably partly exposed above the sediment-water interface. Based on the associated fauna, Costinuculana n. gen. lived in a low-energy environment characterized by a fine-grained, soft substrate.</description><identifier>ISSN: 0022-3360</identifier><identifier>EISSN: 1937-2337</identifier><identifier>DOI: 10.1017/jpa.2016.161</identifier><language>eng</language><publisher>New York, USA: The Paleontological Society</publisher><subject>Abbreviations ; Africa ; Asymmetry ; Autecology ; Autobiographies ; Bathonian ; Bifurcations ; Biostratigraphy ; Bivalvia ; Burrowing organisms ; Carbonates ; Classification ; Classification (sedimentation) ; Coastal environments ; Collections ; Corals ; Costinuculana magharensis ; Cross-sections ; Diagnosis ; Dimensions ; Ecological succession ; Egypt ; Elongation ; Facies ; Fauna ; Fossil animals ; functional morphology ; Gebel Maghara ; Genera ; Geographical variations ; Geology ; Height ; Invertebrata ; invertebrate ; Jurassic ; Kehailia Formation ; Limestone ; Macrofauna ; Magnesium ; Marketing ; Mesozoic ; Middle Jurassic ; Mineral resources ; Mollusca ; Mollusks ; Morphology ; Mountains ; Mud-water interfaces ; New genera ; new taxa ; North Africa ; Nuculanidae ; Orientation ; Palaeontology ; Paleobiology ; Paleoecology ; Paleontology ; Photography ; Physical characteristics ; Predators ; Preservation ; Protobranchia ; Riblets ; Rostrum ; Science ; Sediment ; Sediment-water interface ; Sediments ; Shells ; Sinai Egypt ; Strata ; Stratigraphy ; Taxonomy ; Terminology ; Valves ; Zoobenthos ; Zoology</subject><ispartof>Journal of paleontology, 2017-05, Vol.91 (3), p.434-443</ispartof><rights>2017, The Paleontological Society</rights><rights>Copyright © 2017, The Paleontological Society</rights><rights>GeoRef, Copyright 2020, American Geosciences Institute. 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(Bivalvia, Nuculanidae) from the Middle Jurassic of Gebel Maghara, North Sinai, Egypt</title><title>Journal of paleontology</title><addtitle>J. Paleontol</addtitle><description>The nuculanid bivalve Costinuculana magharensis new genus new species is described from the middle to upper Bathonian Kehailia Formation of Gebel Maghara, North Sinai, Egypt. Costinuculana differs from other genera of the family Nuculanidae by the presence of opisthocline ribs along the rostrum. These ribs are variable in shape and size, straight to folded posteriorly, bifurcate ventrally and occasionally postero-dorsally, and cover an area ~45% of the total valve length from the posterior end. The life position of C. magharensis n. gen. n. sp. is reconstructed on the basis of a functional interpretation of its morphology and by comparison with closely related Recent forms. The asymmetrical commarginal ribs facilitated the burrowing process. The posterior oblique ribs are asymmetrical in cross-section with a steeply concave side in the burrowing direction and slightly convex side in the opposite direction. They probably kept the bivalve in a stable position once the desired depth had been reached. The thick oblique ribs probably also increased the strength of the rostrum and offered resistance against durophagous predators, being presumably partly exposed above the sediment-water interface. 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The life position of C. magharensis n. gen. n. sp. is reconstructed on the basis of a functional interpretation of its morphology and by comparison with closely related Recent forms. The asymmetrical commarginal ribs facilitated the burrowing process. The posterior oblique ribs are asymmetrical in cross-section with a steeply concave side in the burrowing direction and slightly convex side in the opposite direction. They probably kept the bivalve in a stable position once the desired depth had been reached. The thick oblique ribs probably also increased the strength of the rostrum and offered resistance against durophagous predators, being presumably partly exposed above the sediment-water interface. Based on the associated fauna, Costinuculana n. gen. lived in a low-energy environment characterized by a fine-grained, soft substrate.</abstract><cop>New York, USA</cop><pub>The Paleontological Society</pub><doi>10.1017/jpa.2016.161</doi><tpages>10</tpages></addata></record>
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source Jstor Complete Legacy; Cambridge University Press Journals Complete
subjects Abbreviations
Africa
Asymmetry
Autecology
Autobiographies
Bathonian
Bifurcations
Biostratigraphy
Bivalvia
Burrowing organisms
Carbonates
Classification
Classification (sedimentation)
Coastal environments
Collections
Corals
Costinuculana magharensis
Cross-sections
Diagnosis
Dimensions
Ecological succession
Egypt
Elongation
Facies
Fauna
Fossil animals
functional morphology
Gebel Maghara
Genera
Geographical variations
Geology
Height
Invertebrata
invertebrate
Jurassic
Kehailia Formation
Limestone
Macrofauna
Magnesium
Marketing
Mesozoic
Middle Jurassic
Mineral resources
Mollusca
Mollusks
Morphology
Mountains
Mud-water interfaces
New genera
new taxa
North Africa
Nuculanidae
Orientation
Palaeontology
Paleobiology
Paleoecology
Paleontology
Photography
Physical characteristics
Predators
Preservation
Protobranchia
Riblets
Rostrum
Science
Sediment
Sediment-water interface
Sediments
Shells
Sinai Egypt
Strata
Stratigraphy
Taxonomy
Terminology
Valves
Zoobenthos
Zoology
title Costinuculana magharensis n. gen. n. sp. (Bivalvia, Nuculanidae) from the Middle Jurassic of Gebel Maghara, North Sinai, Egypt
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