Revision of the Pragian Rutoceratoidea Hyatt, 1884 (Nautiloidea, Oncocerida) from the Prague Basin

Manda, Štěpán; Turek, Vojtěch

doi:10.3140/bull.geosci.1118

Cited by 11 publications

(22 citation statements)

References 12 publications

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“…The conch became straight and sometimes developed a slight endogastric curvature. The body chamber was directed forward, moderately inclined toward the bottom, which provides better access to the sea floor (Flower 1955(Flower , 1957Stridsberg & Turek 1997;Manda & Turek 2009a. A prominent and deep ocular sinus indicates that the eyes played an important role when searching for food, and was probably higher than in Nautilus.…”

Section: Autecology Of Specimens Reaching Coiled Conch Stagementioning

confidence: 99%

Early ontogeny, anomalous growth, and healed injuries in the Silurian nautiloid Ophioceras Barrande - Implications for hatching and the autecology of the Tarphycerida

Turek¹,

Manda²

2016

Bull. Geosci.

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Our study of the early ontogeny of the Silurian Ophioceras has led to the revision of the current concept that many juvenile tarphycerids possessed a coiled conch upon hatching and thus resembled adults in habit as is in extant Nautilus. In fact, there is no evidence that any Early Palaeozoic coiled nautiloid possessed an embryonic conch exceeding half a whorl. A change in conch coiling, occasionally accentuated by a dorsolateral groove analogous to the nepionic constriction and the appearance of conspicuous growth anomalies indicate that, after hatching, Ophioceras possessed a cap-shaped, slightly curved conch, usually approximately a quarter whorl long. A hatchling thus differed substantially from the likely nektonic late juveniles with coiled conchs and their obliquely oriented aperture as in Nautilus. A relatively large first phragmocone chamber and very short body chamber possibly resulted in positive buoyancy and a planktonic habit of hatchlings. The embryonic conch size is highly variable and the height of the first chamber varies between 1.2-2.6 mm. Changes in sculpture across the embryonic/juvenile conch boundary are sometimes gradual, but frequently, hatching is manifested by an abrupt increase in growth line spacing and the appearance of longitudinal ridges. The cicatrix is here documented in the Tarphycerida for the first time. A distinct chamber length decrease, commonly present close to the end of the first whorl, is not linked with hatching. Anomalous conch structures in Ophioceras including healed injuries, atypical shapes of ribs, atypical courses of septa and pits occurring in late juvenile growth stages are described in the light of the autecology of Ophioceras and the determination of early post-embryonic growth anomalies. •

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Section: Autecology Of Specimens Reaching Coiled Conch Stagementioning

confidence: 99%

Early ontogeny, anomalous growth, and healed injuries in the Silurian nautiloid Ophioceras Barrande - Implications for hatching and the autecology of the Tarphycerida

Turek¹,

Manda²

2016

Bull. Geosci.

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“…Hyatt (1883-84, 1894, 1900, and Foerste (1926) were the first authors who undertook a taxonomic revision of Barrande's cephalopod species (a detailed historical review of taxonomic studies on Bohemian cephalopod faunas was published by Gnoli 1997). However, the majority of these revisions were not based on studies of the actual fossils, but only on a re-evaluation of Barrande's descriptions and figures (see Manda & Turek 2009a). Only a limited number of the published studies were based on direct examinations of Barrande's original materials plus newly collected cephalopod specimens from Bohemia (Horný 1956(Horný , 1965Marek 1971;Turek 1975Turek , 1976Turek , 2008Turek , 2010Kolebaba 1977;Stridsberg & Turek 1997;Manda & Turek 2009c).…”

Section: Cephalopod Biodiversity Datamentioning

confidence: 99%

Silurian-Devonian boundary events and their influence on cephalopod evolution: evolutionary significance of cephalopod egg size during mass extinctions

Manda¹,

Frýda²

2010

Bull. Geosci.

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Diversity evolution of 197 of the latest Ludlow-Lochkovian cephalopod species from Bohemia (representing more that 70 percent of all species known worldwide) was analysed and compared with changes in the global carbon cycle in the marine ecosystem. Our results show a distinct relationship between cephalopod species diversity and the global carbon cycle. A progressive increase in δ 13 C values in marine carbonates from the Monograptus lochkoviensis Zone to the end of the Monograptus transgrediens Zone reflects an increase of bioproductivity in the marine ecosystem. This increase was probably caused by a shallowing of the upwelling system, thus importing nutrient-rich water. A progressive cooling during the Přídolí and earliest Lochkovian triggered these changes in the upwelling system. Our data also show an increase in total diversity of cephalopod species, which may be explained by greater availability of new food sources for a period corresponding to the progressive increase in δ 13 C values. In the latest Silurian, δ 13 C reached its maximal values while the Lochkovian is characterized by steady conditions with a decreasing tendency in δ 13 C values. Strong, selective extinction started in the latest Silurian Monograptus transgrediens Zone and continued to the earliest Devonian Monograptus uniformis Zone. This extinction affected benthic and demersal cephalopod species with relatively large eggs and long incubation times. The change in dynamics of the global carbon cycle thus coincides with the beginning of this extinction. An anoxic or hypoxic event in the period between the LAD Monograptus transgrediens Zone (Transgrediens Event) in the latest Přídolí and the base of the Devonian Monograptus uniformis Zone (documented also from offshore sequences from Poland) is considered to be a cause for the extinction of non-pelagic cephalopods. Our study also revealed a need to revise and define all earlier established bioevents in the Silurian-Devonian boundary interval more clearly. •

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“…Rutoceratoids arose close to the Lochkovian/Pragian boundary, disappeared in the early Frasnian (for summary, see Manda and Turek 2009 a ) and formed a characteristic component of the temperate‐water faunas of the Early/Middle Devonian Old World (e.g. Zhuravleva 1974, Dzik and Korn 1992, Turek 2007) and Middle Devonian Eastern American realms (Flower 1945, 1957).…”

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confidence: 99%

Late Emsian Rutoceratoidea (Nautiloidea) from the Prague Basin, Czech Republic: morphology, diversity and palaeoecology

Manda

Turek

2011

Palaeontology

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Nautiloids of the superfamily Rutoceratoidea from the late Emsian (late Early Devonian) of the Prague Basin (Czech Republic) are commented upon. Species recognized include the hercoceratids Hercoceras mirum, H.? transiens, Ptenoceras proximum, P. nudum, P. minusculum and Anomaloceras anomalum, as well as the rutoceratids Adelphoceras bohemicum, Homoadelphoceras devonicans, Pseudorutoceras bolli and Goldringia? devonicans. In addition, four new species are described: Parauloceras regulare sp. nov., Roussanoffoceras chlupaci sp. nov., Otomaroceras sp. nov. and Goldringia sp. nov. Morphology and distribution patterns of Pragian and late Emsian rutoceratoid faunas from the Prague Basin are compared. They show that an increased diversity was accompanied by a higher level of specialization of rutoceratoids, which manifested itself in low abundance, increased facies dependence and greater variation in shell size during the Early Devonian. The evolution of sculpture and a contracted aperture, both regarded as protective adaptive features, was also examined, but no adaptive trend towards more pronounced sculpture and constriction of the aperture was found to have occurred in the Early Devonian. A more distinctive sculpture was, however, observed in shallow-water assemblages of P. proximum in comparison with deeper-water faunules, and two additional cephalopod species were examined in order to obtain comparative data. The presence of distinct sculpture patterns in coeval shallowand deeper-water assemblages suggests limited migration between them and consequently reflects some degree of territoriality in Devonian nautiloids. New data on early shell development in P. proximum are presented. During the Choteč Event, rutoceratoid generic diversity dropped dramatically, one family became extinct and the Early Devonian diversification of the group came to an end. The recovery of nautiloid faunas was slower than that of other cephalopods and associated, unrelated invertebrates. The absence of change in abundance patterns between Pragian and late Emsian rutoceratoid faunas, i.e. prior to and subsequent to ammonoid radiation, suggests that the appearance and radiation of the latter group in the early Emsian did not affect the structure of nautiloid assemblages, i.e. these two clades did not occupy the same niches.

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Revision of the Pragian Rutoceratoidea Hyatt, 1884 (Nautiloidea, Oncocerida) from the Prague Basin

Cited by 11 publications

References 12 publications

Early ontogeny, anomalous growth, and healed injuries in the Silurian nautiloid Ophioceras Barrande - Implications for hatching and the autecology of the Tarphycerida

Early ontogeny, anomalous growth, and healed injuries in the Silurian nautiloid Ophioceras Barrande - Implications for hatching and the autecology of the Tarphycerida

Silurian-Devonian boundary events and their influence on cephalopod evolution: evolutionary significance of cephalopod egg size during mass extinctions

Late Emsian Rutoceratoidea (Nautiloidea) from the Prague Basin, Czech Republic: morphology, diversity and palaeoecology

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