First Record of a Primitive Radiolitid Rudist from Japan

Sano, Shin–ichi; Massé, Jean-Pierre

doi:10.2517/1342-8144-17.4.317

Cited by 12 publications

(24 citation statements)

References 28 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…This new genus is proposed to embrace the distinctive grouping of south‐west Asian to Japanese radiolitid species that are characterized by a compact (non‐celluloprismatic) outer shell layer and which were formerly attributed to Eoradiolites by Masse and Gallo Maresca () and Sano and Masse (). Despite showing a similar configuration of radial bands to that in Eoradiolites , Auroradiolites differs from the former genus in its possession of the following characters: (1) an entirely compact fibrous prismatic, as opposed to celluloprismatic ol in the RV (contrary to the erroneous description of polygonal cells in a specimen of A. gilgitensis by Skelton, in Pudsey et al .…”

Section: Systematic Palaeontologymentioning

confidence: 99%

“…B–C can be excluded from the species as suggested above. In this respect, A. biconvexus also differs from the type species of the genus, A. gilgitensis (Douvillé, ), in which the LV is considered to be ‘not strongly convex’ (Sano and Masse , p. 320). The latter species, moreover, lacks any clear indication of the radial undulations of the ol inner margin seen in A. biconvexus (Sano and Masse ; see also Fig.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

“…; Pudsey et al . ; Mathur and Vogel ; Masse and Gallo Maresca ; Sano and Masse ; Upadhyay and see also Upadhyay , fig. 4b).…”

mentioning

confidence: 90%

“…However, in most cases, the diagnostic characters of the genera or even families have not been well established in these publications, so their identification remains problematic and in need of revision according to recent advances in rudist classification. Such revision is of particular interest given the intermediate palaeogeographical position of this fauna between the classically documented rudist faunas of the Mediterranean/Middle Eastern Tethyan region and those of Pacific provenance, largely described in the last few years (Masse and Shiba ; Sano and Masse ; Skelton et al . ; Sano et al .…”

mentioning

confidence: 98%

See 3 more Smart Citations

Mid‐Cretaceous rudists (Bivalvia: Hippuritida) from the Langshan Formation, Lhasa block, Tibet

Rao

Skelton

Sha

et al. 2015

Papers in Palaeontology

View full text Add to dashboard Cite

The Cretaceous Langshan Formation, which crops out along the northern portion of the Lhasa block, is composed mainly of grey or grey-black fine-grained limestones, argillaceous limestones and a few thin-bedded siltstones and silty mudstones. From specimens collected and/or photographed in the field, combined with a revision of taxa previously recorded from the Langshan Formation, four rudist taxa are recognized: (1) Auroradiolites gen. nov.; (2) Eoradiolites cf. davidsoni; (3) Magallanesia rutogensis sp. nov.; and (4) Sellaea sp. We propose Auroradiolites gen. nov. for the grouping of SW Asian to Pacific radiolitid species formerly attributed to Eoradiolites and characterized by a compact (non-celluloprismatic) outer shell layer. The new genus is represented in the Langshan Formation by A. biconvexus (Yang et al., 1982), including several other synonymized taxa. Taxonomic confusion in the literature has resulted from the varied appearance of the strongly developed ligamentary infolding in such forms: in the right valve, it has a forked inner termination, but common transverse sections through both valves show the latter juxtaposed against its broad, rounded counterpart in the left valve, giving the combined terminations a bulb-shaped appearance. Associated Eoradiolites cf. davidsoni is of smaller size and, by contrast, shows the celluloprismatic structure of the outer shell layer. The recently described canaliculate polyconitid genus, Magallanesia Sano et al., 2014, is represented by M. rutogensis sp. nov., which differs from the type species in possessing more numerous and ventrally extended canals in the left valve. Possibly belonging with the latter species are isolated right valves, similar to Horiopleura, but containing tabulae. A probable Sellaea sp. is represented by poorly preserved right valves nevertheless showing typical features, including a very thin outer shell layer and an erect posterior myophoral wall, separating off a broad posterior ectomyophoral cavity. Based on the presence of Magallanesia and the orbitolinid record, this rudist fauna is probably no older than late Albian, while a younger age cannot be excluded. Both Magallanesia and Auroradiolites are characteristic of a SW Asian/central Pacific faunal province, while the other two genera are more widely distributed.

show abstract

Section: Systematic Palaeontologymentioning

confidence: 99%

Section: Systematic Palaeontologymentioning

confidence: 99%

“…; Pudsey et al . ; Mathur and Vogel ; Masse and Gallo Maresca ; Sano and Masse ; Upadhyay and see also Upadhyay , fig. 4b).…”

mentioning

confidence: 90%

mentioning

confidence: 98%

See 2 more Smart Citations

Mid‐Cretaceous rudists (Bivalvia: Hippuritida) from the Langshan Formation, Lhasa block, Tibet

Rao

Skelton

Sha

et al. 2015

Papers in Palaeontology

View full text Add to dashboard Cite

show abstract

“…gr. gilgitensis (Douvillé) (Masse and Gallo‐Maresca ; Sano and Masse ), Radiolites ? costata Scott (Scott, ) and the genus Gorjanovicia (Polsak, ), are considered to be valid members of the Radiolitidae.…”

Section: Systematic Palaeontologymentioning

confidence: 99%

Evolution of the rudist bivalve Agriopleura Kühn (Radiolitidae, Hippuritida) from the Mediterranean region

Massé

Fenerci-Masse

2014

Palaeontology

Self Cite

View full text Add to dashboard Cite

The genus Agriopleura (Radiolitidae) is restricted to the Lower Cretaceous of the Mediterranean region, including the Middle East, and this rudist is apparently absent from the New World. Agriopleura underwent a size increase from late Hauterivian to mid‐late Barremian, matching Cope's rule, followed by a Lilliput phase in the early Aptian. The relative development of radial bands increased through time and represents a key evolutionary index. During its evolution, Agriopleura increased in species diversity and expanded geographically onto the European Mediterranean Tethyan margin from the late Hauterivian to Barremian, after which it disappeared from the region (pseudotermination). In the lower Aptian, after a Lazarus gap, the genus reappears in the southern Mediterranean Tethyan margin. Assuming that Archaeoradiolites is the direct descendant of Agriopleura, the disappearance of the genus in the mid‐Aptian was a pseudoextinction and this coincided with a major crisis of shallow carbonate settings and their associated biota. The definition of Agriopleura species is based on a set of qualitative and quantitative external and internal characters. Five species are recognized: three Barremian species, Agriopleura blumenbachi, the type species, A. marticensis and A. carinata; one lower Aptian species A. libanica; and a new species A. sequana restricted to the upper Hauterivian. Principal component analysis is used to test the distinctiveness of the species and the pattern of relationships of some of their key quantitative characters.

show abstract

Evolution and palaeogeographical dispersion of the radiolitid rudist genus Auroradiolites (Bivalvia, Hippuritida) with descriptions of new material from Tibet and archived specimens from Afghanistan

Rao

Skelton

Sano

et al. 2017

Papers in Palaeontology

Self Cite

View full text Add to dashboard Cite

Diagnostic characters of the recently established new genus of radiolitid rudist Auroradiolites include an entirely compact outer shell layer, a distinctly convex upper (left) valve and a robust myocardinal apparatus surrounding a strongly internally projected ligamentary infolding. Until now, A. biconvexus (previously considered to be exclusively late Albian in age) has been reported only from the Langshan Formation, which crops out along the northern portion of the Lhasa block, Tibet. Here, it is recorded for the first time from the Sangzugang Formation of the Xigaze Forearc Basin, situated on the southern margin of the Lhasa block. A. biconvexus differs from the south‐west Asian type species A. gilgitensis (late Aptian to Albian) by its relatively larger size, more strongly domed left valve and distinct radial undulations of the outer shell layer. The characters of A. gilgitensis are further clarified from archived material from central Afghanistan, also newly identified and described herein. All Auroradiolites records to date are revised. The recognition of examples of A. biconvexus from upper Aptian strata increases both the stratigraphical and geographical ranges of the species, indicating that it had already branched off from A. gilgitensis in the late Aptian. Some new radiolitid specimens that combine both compact and cellular calcitic outer shell layer structures are also described from the Langshan Formation, but a number of internal differences from Auroradiolites cast doubt on their constituting a sister group to the latter and we assign them to Eoradiolites cf. hedini. Rather, the evolution of Auroradiolites directly from the ancestral radiolitid genus Agriopleura is favoured on the grounds of parsimony. So far, the genus Auroradiolites has been recorded from Iran, central and eastern Afghanistan, the type locality of Yasin in north‐western Pakistan, southern and northern Ladakh, the Lhasa block, as well as Hokkaido in northern Japan. During the late Aptian to Albian interval, all of these localities were associated with terranes and blocks that were limited to the north‐eastern margin of Tethys and the western Pacific margin, making Auroradiolites an indicator of a SW Asian to Pacific faunal province.

show abstract

First Record of a Primitive Radiolitid Rudist from Japan

Cited by 12 publications

References 28 publications

Mid‐Cretaceous rudists (Bivalvia: Hippuritida) from the Langshan Formation, Lhasa block, Tibet

Mid‐Cretaceous rudists (Bivalvia: Hippuritida) from the Langshan Formation, Lhasa block, Tibet

Evolution of the rudist bivalve Agriopleura Kühn (Radiolitidae, Hippuritida) from the Mediterranean region

Evolution and palaeogeographical dispersion of the radiolitid rudist genus Auroradiolites (Bivalvia, Hippuritida) with descriptions of new material from Tibet and archived specimens from Afghanistan

Contact Info

Product

Resources

About