Bivalvia from the English Lower Oxford Clay (Middle Jurassic)

Duff, Keith

doi:10.1080/25761900.2022.12131739

Cited by 38 publications

(13 citation statements)

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“…Recently, Hryniewicz et al (2014, p. 16) followed Duff's (1978) view and assigned some Jurassic Palaeoneilo species, such as P. elliptica (Goldfuss, 1837) from the Rhaetian-Pliensbachian of Europe (Palmer, 1973;Hodges, 2000) and P. morrisi (Deshayes, 1853) from the Callovian of England and France (Duff, 1978), to Mesosaccella, but on the basis of shell outline and ornamentation. Therefore, there is some confusion in the literature about the assignment of Mesozoic species to Palaeoneilo or Mesosaccella.…”

Section: Methodsmentioning

confidence: 99%

“…The general shell morphology of Palaeonucula is similar to Nucula Lamarck, but the shell is non-nacreous and has smooth shell margins (Damborenea and Pagani, 2019, p. 929). In addition, species of Nucula should be restricted to forms with radial ribbing on the shell surface, which clearly distinguishes them from both Palaeonucula and Nuculoma (Duff, 1978, p. 23). Recently, Hodges (2000, p. 13) stated that the main differences between Palaeonucula and Nuculoma are that the latter has more strongly enrolled opisthogyrate umbones and fine, regular commarginal growth lines on the shell surface.…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…The genus is also known from the Triassic of Europe, Mexico, Chile, New Zealand, China, and Japan and from the Jurassic of Switzerland, England, Sweden, Russia, India, and Japan (Damborenea, 1987, p. 54). Duff (1978) included some Jurassic species of Palaeoneilo in Mesosaccella Chavan, 1946, due to the lack of a resilifer and presence of a shallow radial sulcus close to the posterodorsal side. Mesosaccella originally had been erected on specimens from Campanian–Maastrichtian rocks (Upper Cretaceous) of Germany and had been placed in the family Nuculanidae by Müller (1847, p. 17, pl.…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…24c, 30b), fine and dense commarginal ribs, and in lacking anterior umbonal ridges. Nuculoma kathrynae Duff, 1978 (p. 21, pl. 1, figs.…”

Section: Systematic Paleontologymentioning

confidence: 99%

“…Recently, Hodges (2000, p. 13) stated that the main differences between Palaeonucula and Nuculoma are that the latter has more strongly enrolled opisthogyrate umbones and fine, regular commarginal growth lines on the shell surface. For more details, see Duff (1978), Hodges (2000), and Damborenea and Pagani (2019, p. 929). The paleogeographic distribution of Palaeonucula during Middle–Late Triassic and Early Jurassic has been summarized by Ros et al (2014, p. 10, fig.…”

Section: Systematic Paleontologymentioning

confidence: 99%

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Revision of Jurassic Protobranch Bivalves from Gebel Maghara, northern Sinai, Egypt

2023

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The Jurassic rocks of Gebel Maghara, northern Sinai, Egypt, contain a well-preserved and highly diverse macrobenthic fauna, dominated by bivalves. This fauna, particularly bivalves and gastropods, have received little attention in the last 100 years. In an attempt to provide a sound database on the marine bivalve diversity of Egypt during the Jurassic period, a first faunal group, the protobranch bivalves, is reviewed in detail. Sixteen taxa (three of them new), belonging to two orders, five families, and nine genera are systematically described and compared to closely related Jurassic taxa from various locations, particularly in Europe and India. New species are Nuculoma douvillei n. sp., N. sinaiensis n. sp., and Palaeoneilo aegyptiaca n. sp. In addition, Palaeonucula cuneiformis (J. de C. Sowerby), P. muensteri (Goldfuss), Dacryomya diana (d'Orbigny), D. lacryma (J. de. C. Sowerby), and Praesaccella juriana Cox are identified from Jurassic strata of Egypt for the first time. The younger records of the genus Palaeoneilo have not been accepted by some researchers, since almost all exhibit only limited features. The genus occurs with certainty in the Middle Jurassic (Bajocian‒Bathonian) rocks of Egypt, based on well-preserved external and internal characters. Similarly, Dacryomya and Ryderia from Bathonian‒Kimmeridgian rocks of Egypt are younger than previously recorded from other parts of the world. The identified genera have wide geographic ranges and have been reported from different faunal provinces, which suggests that latitudinal climate differences did not influence their distribution pattern to a great extent.UUID: https://zoobank.org/7f3a9185-d690-4563-bdc0-df1c8d42ec0d

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