Some silicified strophomenacean brachiopods from the Ordovician of Kentucky, with comments on the genus Pionomena

Pope, John K.

doi:10.3133/pp1066l

Cited by 6 publications

(5 citation statements)

References 8 publications

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“…Because of the abundance of new material and the great diversity of the Cincinnati arch fauna, only the symmetrical molluscan univalves are covered herein. Previous reports on other invertebrate fossil groups from the new collections have dealt with trilobites (Ross, 1967(Ross, , 1979, brachiopods (Neuman, 1967;Alberstadt, 1979;Howe, 1979;Pope, 1982;Walker, 1982), echinoderms (Bell, 1979;Branstrator, 1979;Parsley, 1981), corals (Elias, 1983), ostracodes (Warshauer and Berdan, 1982;Berdan, 1984), and bryozoans (Karklins, 1984).…”

Section: Introductionmentioning

confidence: 99%

Middle and Upper Ordovician symmetrical univalved mollusks (Monoplacophora and Bellerophontina) of the Cincinnati Arch region

Wahlman¹

1992

Professional Paper

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although none were present in the fauna under consideration, are the sinuate planispiral families Bucanellidae, Grandostomatidae, Tremanotidae, and Euphemitidae.New taxa of Monoplacophora named herein are Micropileus variabilis, Archinacella alta, Archinacellal davisi, Archinacella area, Cyrtolites (Cyrtolites) claysferryensis, Cyrtolites (Cyrtolites) hornyi, and the subgenus Cyrtolites (Paracyrtolites). New taxa of Bellerophontacea named herein are subfamily Undulabucaniinae, genus Undulabucania, subfamily Bucanopsinae, Bucanopsis diabloensis, Bucania pojetai, and subfamily Pedasiolinae.

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Section: Introductionmentioning

confidence: 99%

Middle and Upper Ordovician symmetrical univalved mollusks (Monoplacophora and Bellerophontina) of the Cincinnati Arch region

Wahlman¹

1992

Professional Paper

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“…It was observed that shells of Flabellocyrtia flabellulum and of Thecocyrtella dagysii sometimes possess a deltidium and sometimes not (compare Figs 4.12, 4.24 and 4.14, 4.17, 4.25–4.29, 4.34 as well as 6.1, 6.2, 6.5, 6.7 and 6.3, 6.13, 6.18, 6.32, 6.34–6.37; specimens lacking the deltidium are more frequent). This is best interpreted as resulting from selective silicification; a very similar situation (pseudodeltidium lacking or more seldom present due to selective silicification) was described by Pope (1982, p. 4; see also Holdaway and Clayton, 1982). Hollow spaces appearing inside the shell are also an artifact explained by the silicification either proceeding from the external surfaces towards the internal layers and often remaining incomplete (for an example of a list of artifacts caused by silicification, see Caruthers and Stanley, 2008, p. 155) or occurring preferentially along certain layers of the shell (Crowley, 1988; Carson, 1991, p. 462).…”

Section: Methodsmentioning

confidence: 52%

Unusual brachiopod fauna from the Middle Triassic algal meadows of Mt. Svilaja (Outer Dinarides, Croatia)

Halamski¹,

Bitner²,

Kaim³

et al. 2015

J. Paleontol.

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Ladinian deposits at Mt. Svilaja in Dalmatia (Outer Dinarides, Croatia) yielded an abundant brachiopod fauna of low diversity interpreted as a parautochthonous assemblage representing an ecosystem of dasycladacean submarine meadow. The fauna consists of four named species and one left in open nomenclature. The most common is the spiriferinideFlabellocyrtia flabellulumChorowicz and Termier, 1975 (Spiriferinida) accounting for more than 70% of the material. The athyridideCassianospira humboldtii(von Klipstein, 1845) is the only species known from elsewhere (Anisian of Southern Alps). The new species of SpiriferinidaThecocyrtella dagysiiHalamski, Bitner, Kaim, Kolar-Jurkovšek, and Jurkovšek n. sp. differs from other representatives of the genus in having a deep ventral sulcus.Albasphe albertimagniHalamski, Bitner, Kaim, Kolar-Jurkovšek, and Jurkovšek n. gen. n. sp. is a new brachiopod that possesses a dorsal septum with an intra-septal cavity and dorsal submarginal ridges, both features in common with AalenianZellaniaMoore, 1855 from which it differs in lack of the ventral septum and of ventral submarginal ridges. They are interpreted as members of a sparsely recorded paedomorphic evolutionary line of terebratulides with secondarily lost loop, described formally herein as Gwyniidina Halamski and Bitner n. subordo and subdivided into newly emended Dispheniidae Grant, 1988 (Dispheniinae Grant, 1988 with the only genusDispheniaand Albasphinae Halamski and Bitner n. subfam. withAlbaspheandZellania) and Gwyniidae MacKinnon, 2006 (including RecentGwyniaandSimpliciforma). In contrast to previous interpretations, the trocholophe lophophore ofGwyniais interpreted herein as secondarily simplified.

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“…Evidence that other concavo-convex brachiopods could move was reported by Sardeson (1929), who showed ''Rafinesquina'' minnesotaensis (probably Oepikina minnesotaensis; see Pope, 1982) in a similar escape position to that seen in Sowerbyella. Evidence of movement also comes from traces associated with the widespread Cincinnatian brachiopod Rafinesquina alternata.…”

Section: Introductionmentioning

confidence: 81%

Escape traces associated with Rafinesquina alternata, an Upper Ordovician strophomenid brachiopod from the Cincinnati Arch Region

Dattilo¹,

Meyer²,

Dewing³

et al. 2009

PALAIOS

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Strophomenid brachiopods of the genus Rafinesquina, lying flat, convex-side up on limestone bedding surfaces in the Cincinnati Ordovician, are sometimes associated with moats, which are sediment depressions or gutters ,5-mm wide surrounding the commissure. Moats are interpreted as trace fossils, excavated by water expelled as the valves snapped shut. Other specimens vary from nearly horizontal to nearly vertical with the hinge line down and commissure up. Meniscate backfill beneath the anterior shell margin traces an arcing path formed as the shell rotated upwards around the posterior hinge line. Rotational tracks are interpreted as trace fossils, recording movement from an initial position buried horizontally to an inclined position as the brachiopod tried to escape burial. The traces form a continuum. Specimens lying flat on the bed surface have moats but no rotational tracks. Inclined shells are associated with deeper burial by obrution events and a greater arc of rotation. The moat shape is inconsistent with differential compaction. The precise association between moats and commissures and the independence of these structures on shell azimuth are inconsistent with current scour. If moats formed by rapid expulsion of water during valve snapping, then rotational tracks may have formed by a similar process. These traces are interpreted as fugichnia formed in response to catastrophic burial, but some moats could be equilibrichnia, formed by adjustment to minor sedimentary events. Rotational traces are similar to type 1 structures of Sowerbyella. If these two genera had similar tracemaking abilities, then other strophomenates probably shared these abilities.

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Some silicified strophomenacean brachiopods from the Ordovician of Kentucky, with comments on the genus Pionomena

Cited by 6 publications

References 8 publications

Middle and Upper Ordovician symmetrical univalved mollusks (Monoplacophora and Bellerophontina) of the Cincinnati Arch region

Middle and Upper Ordovician symmetrical univalved mollusks (Monoplacophora and Bellerophontina) of the Cincinnati Arch region

Unusual brachiopod fauna from the Middle Triassic algal meadows of Mt. Svilaja (Outer Dinarides, Croatia)

Escape traces associated with Rafinesquina alternata, an Upper Ordovician strophomenid brachiopod from the Cincinnati Arch Region

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