Aequipecten macrotis (G. B. Sowerby I in Smith, 1847)
SMITH, J. 1847. On the Age of Tertiary Beds of the Tagus, with a Catalogue of the fossils. Quarterly Journal of the Geological Society, 3: 410-422, pls. 15-20. [p. 420, pl. 17, fig. 15]
J. Smith, 1847, plate 17.
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«P. testâ subinaequivalvi, aequilaterali, radiatim costatâ; costis viginti scabris, dorso acutiusculis, lateribus utroque costellatis, interstitiis angustioribus, costellâ unicâ medianâ; auriculis magnis, radiatim striatis, scabris. Long. 1.5, lat. 0.6, alt. 1.6 poll.
Found at Adiça, south of Lisbon, and near Piedade. This species somewhat resembles P. opercularis; it may however easily be distinguished from that species by the great depth of one valve and the much larger ears. In Mr. Sharpe's collection.»
GEORGE BRETTINGHAM SOWERBY I IN JAMES SMITH, 1847
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«Material: A single complete left valve and one fragment (BSPG 2007 X 55).
Description: Small, relatively slender specimen (disc angle ~ 95°) with 20 costae. Costae prominent; well-rounded in cross-section. Surface moderately abraded, obscuring ornamentation details. Pronounced commarginal lirae in rib interspaces only partially preserved.
Remarks: SCHULTZ (2001) mentions close affinities of A. macrotis macrotis and A. macrotis miotransversus to A. submalvinae, but still regards the latter as a separate species. Based on hundreds of specimens, representing all states of preservation from the Eggenburgian and Ottnangian strata in Lower Bavaria, the present author regards the Central Paratethys records of A. macrotis, A. macrotis miotransversus, and A. submalvinae as conspecific, as they do not differ significantly from each other with regard to disc angle, number and shape of costae, and ornamentation of the auricles and disc surface. Less prominent variation in the strength of the costae and degree of lateral symmetry is attributed to intraspecific variability. A. scabrellus (LAMARCK) is distinguished from A. macrotis by the smaller number of more pronounced costae and by the typically narrow disc angle especially in early growth stages.
Occurrence: This is the most abundant Aequipecten species in the Eggenburgian and Ottnangian of the Paratethys. It also frequently occurs in the Miocene of the Mediterranean and Atlantic regions.»
SCHNEIDER, S., B. BERNING, M. A. BITNER, R.-P. CARRIOL, M. JÄGER, J. KRIWET, A. KROH & W. WERNER. 2009. A parautochthonous shallow marine fauna from the Late Burdigalian (early Ottnangian) of Gurlarn (Lower Bavaria, SE Germany): Macrofaunal inventory and paleoecology. Neues Jahrbuch für Geologie und Paläontologie, Abhandlungen, 254 (1-2): 63-103, figs. 1-11. [p. 71, 72]
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Aequipecten macrotis (Sowerby, 1847); S. Schneider, B. Berning, M. A. Bitner, R.-P. Carriol, M. Jäger, J. Kriwet, A. Kroh & W. Werner, 2009, A parautochthonous shallow marine fauna from the Late Burdigalian (early Ottnangian) of Gurlarn (Lower Bavaria, SE Germany): Macrofaunal inventory and paleoecology, figure 3I.
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«Remark: With 18 to 24 ribs, this characteristic species has significantly fewer ribs than Aequipecten malvinae. Aequipecten macrotis is tipically represented in the Early Badenian sediments of Ground and Niederleis. At Niederleis, it is the most typical molluscan species of the maerl facies (Mandic et al. 2002). In the latter locality it has been characteristically found is a marl facies. In the Paratethys it is present in the Burdigalian Upper Marine Molasse of the Western Paratethys. In the Central Paratethys the oldest findings are from the "late Ottangian" of Bantapuszta in Hungary (see Shultz 2001).
Stratigr./Geogr. range: Late Ottangian to Badenian of the Central Paratethys. Miocene of the Mediterranean to NE Atlantic.»
MANDIC, O. 2004. Pectinid bivalves from the Grund Formation (Lower Badenian, Middle Miocene, Alpine-Carpathian Foredeep) - Taxonomic revision and stratigraphic revision. Geologica Carphatica, 55 (2): 129-146, figs. 1-7. [p. 138]
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Aequipecten macrotis (Sowerby in Smith); O. Mandic, 2004, Pectinid bivalves from the Grund Formation (Lower Badenian, Middle Miocene, Alpine-Carpathian Foredeep) - Taxonomic revision and stratigraphic revision , figures 5.1, 5.2.
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«Material: Mühlbach (Mül) – one distally fragmented right valve and one fragment of the posterodorsal region of one left valve; the original height of the left valve did not exceed 15 mm.
Shell biconvex, with 18 regularly arranged, prominent, highly convex ribs, which initiate synchronously. The ribs of the central region are smooth (abraded?); the ribs on the lateral region bear scales on the tops. The interspaces are somewhat narrower than the ribs, weakly concave, ornamented by projecting, commarginal lamellae and an antimarginal microsculpture. The lamellae climb up the ribs, especially in the lateral regions. The right anterior ear is pointed anteriorly; the active ctenolium is well developed with 4 strong denticles; the ears bear scaly riblets and projecting commarginal lirae. The left posterior ear is large with a concave posterior margin. Interior shell side develops interior rib carinae; the right hinge has pronounced resiliar teeth and thin dorsal teeth.
The ctenolium development of the right valve indicates a byssate mode of life. Usually the young Aequipecten preferably live fixed to substrate, whereas the large adult specimens recline on the sediment (WALLER 1991).Paragraph. Haz clic aquí para editar.
Aequipecten macrotis is typically represented in the Early Badenian Sediments of Grund and Niederleis (MANDIC & al. 2002). In the latter locality it is characteristically found is a maerl facies. In the Paratethys it is present since the Ottnangian. In the Mediterranean and Atlantic it seems to be represented throughout the Miocene (SCHULTZ 2001).»
MANDIC, O. & M. HARTZHAUSER. 2003. Molluscs from the Badenian (Middle Miocene) of the Gaindorf Formation (Alpine Molasse Basin, NE Austria) – Taxonomy, Paleoecology and Biostratigraphy. Annalen der Naturhistorischen Museums in Wien, 104 A: 85-127. [p. 102, 103]
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Aequipecten macrotis (Sowerby, 1847); O. Mandic & M. Hartzhauser, 2003, Molluscs from the Badenian of the Gaindorf Formation, plate 5, figures 2a-d (above); plate 6, figures 1a-d (below).
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Aequipecten macrotis (G.B. Sowerby, 1847) was originally described from Miocene (Tortonian) strata near Lisbon (Portugal). Material from the type area was illustrated by Roger (1939, p. 114, pl. 14, figs. 7-10; pl. 15, figs 7, 8; text-fig. 58), who considered Chlamys (Aequipecten) multiscabrella Sacco, 1897, Ch. plubiensis Ugolini, 1906, Ch. (A.) vasconiensis, Ch. (A.) raulini, Ch. (A.) raouli, Ch. (A.) degrangei and Ch. (A.) liberata to be subjective junior synonyms. With the exception of the second, these taxa are here considered to be valid. Portuguese material of A. macrotis differs from A. wagenaari in having 18-24 radial ribs with small squame, but without spines, while its disc shape comes close to that of A. opercularis.
MARQUET, R. & H. H. DIJKSTRA. 2000. Pliocene species of Aequipecten (Mollusca, Bivalvia, Pectinidae) from the North Sea Basin. Contributions to Tertiary and Quaternary Geology, 37 (3-4): 39-55, pls. 1, 2.
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«RAPPORTS ET DIFFÉRENCES. — La forme est plus équilatérale et plus allongée dans le sens umbono-palléal que Ch. scabrella; alors que le nombre des côtes principales de Ch. scabrella est de 15-18, celui de Ch. macrotis est de 18-20 et, en y ajoutant les côtes econdaires, 24-26. L'ornementation des côtes est moins écailleuse.
RÉPARTITION. — EN HONGRIE, dans l'Helvélien: Mogyoród, Várpalota, Egyházasgerge (com. Nógrád); dans le Tortonien: Sámsonháza, Matraverebély-Szentkut, Mátraszöllös, Nógrádszakál, Szupatak, Tótmarokháza (Márkháza), Piliny; Kemence, Balaton (com. Heves), Bóta (com. Borsod). — Faciès: calcaire, sable argileux, grès. — Très répandue.
AUTRES LOCALITÉS: bassin de Vienne dans l'Helvétien et le Tortonien; Italie, fréquente dans l'Helvétien; Tchécoslovaquie orientale, Portugal, Catalogne, très fréquente dans le Tortonien; Sicile dans le Miocène moyen.»
CSEPREGHY-MEZNERICS, I. 1960. Pectinidés du Néogène de la Hongrie et leur importance stratigraphique. Mémoires de la Société Géologique de France [Nouvelle série], 92: 1-58, pls. 1-35. [p. 22, 23]
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Chlamys macrotis (Sowerby); I. Csepreghy-Meznerics, 1960, Pectinidés du Néogène de la Hongrie, plate 15, figures 1, 3-21.
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«Características e Refêrencias
Ch. macrotis foi confundida com Ch. scabrella da qual se distingue pelas características atrás referidas. Foi confundida, também, com Ch. opercularis e outras espécies deste grupo, distingue-se no entanto fàcilmente de Ch. opercularis pela sua convexidade muito mais acentuada e pelo seu vértice muito mais curvo. Distribuição
Aparece no Helveciano Vᵇ de Lagos. Na região de Lisboa é conhecida desde o Helveciano Vᵇ até ao Tortoniano VIIᵇ. No estrangeiro é conhecida no Burdigaliano do Sudoeste da França e da Bacia de Viena, no Helveciano do Sudoeste da França, da Itália e da Bacia de Viena; finalmente, no Tortoniano de Espanha e da Bacia de Viena.» VEIGA FERREIRA, O. DA. 1951. Os Pectinídeos do Miocénico do Algarve. Comunicações dos Serviços Geológicos de Portugal, 32 (1): 153-176, pls. 1-11. [p. 168]
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Chlamys macrotis Sowerby; O. da Veiga Ferreira, 1951, Os Pectinídeos do Miocénico do Algarve, plate 10, figures 45.
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«Rapports et différences.— Cette espèce se distingue de Ch. scabrella par ses côtes plus nombreuses, plus faibles, moins saillantes, et, son omementation plus fine.
De Ch. opercularis et atttres espèces de ce groupe, Ch. macrotis se distingue essentieilement par sa convexité plus grande, soll sommet nettement recourbé. Répartition géographique et stratigraphique.— Ch. macrotis se trouve dès le BurdigaIien en Autriche (Ch. opercularis var. mio-transversa SCHAFFER) à Grund, Windpassing, etc., et en Aquitaine (Ch. liberata COSS. et PEYROT), mais elle est rare. Dans I'Helvétien elle devient abondante, bien typique et se répand dans Ie domaine méditerranéen et atlantique. Dans le premier, elle se trouve en Italie (Colline de Turin, Mte Vallassa), dans le bassin de Vienne et à Passau; dans le second, elle a été dissociée dans I'Aquitaine en toute une série d'espèces, indiquées dans la synonymie, par Cossmann et Peyrot. Dans le Tortonien, elle est toujours répandue dans le Bassin de Vienne, en Catalogne (Montjuich), où elle est nommée dans les collections, par Almera, P. Menkel GOLDF. et P. variusculus ALM. var. orbiculata et dans le domaine atlantique au Portugal (différentes localités des environs de Lisbonne).» ROGER, J. 1939. Le genre Chlamys dans les formations néogènes de l'Europe. Conclusions générales sur la répartition géographique et stratigraphique des Pectinidés du Tertiare Récent. Mémoires de la Société Géologique de France [Nouvelle Série], 17 (2-4): 1-294, pls. 1-28. [p. 116]
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Chlamys macrotis Sowerby; J. Roger, 1939, Le genre Chlamys dans les formations néogènes de l'Europe, plate 14, figures 7-10; plate 15, figures 7, 8.
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