Gastropods from the Early/Middle Jurassic transition of Franconia (Southern Germany)

Schulbert, Christian; Nützel, Alexander

doi:10.3140/bull.geosci.1418

Cited by 23 publications

(42 citation statements)

References 26 publications

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“…Moreover, there are examples of species with multiwhorled larval shells of the planktotrophic type which show a gradual indistinct transition to the teleoconch, for example, in Jurassic aporrhaids and cerithioids (Gründel ; Gründel et al . ; Schulbert and Nützel ). Thus, the transition from the larval shell to the teleoconch alone should not be used as diagnostic for larval traits but is useful in combination with other criteria.…”

Section: Planktotrophy As Inferred From Protoconch Morphology and Dimmentioning

confidence: 99%

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Larval ecology and morphology in fossil gastropods

Nützel

2014

Palaeontology

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The shell of marine gastropods conserves and reflects early ontogeny, including embryonic and larval stages, to a high degree when compared with other marine invertebrates. Planktotrophic larval development is indicated by a small embryonic shell (size is also related to systematic placement) with little yolk followed by a multiwhorled shell formed by a free‐swimming veliger larva. Basal gastropod clades (e.g. Vetigastropoda) lack planktotrophic larval development. The great majority of Late Palaeozoic and Mesozoic ‘derived’ marine gastropods (Neritimorpha, Caenogastropoda and Heterobranchia) with known protoconch had planktotrophic larval development. Dimensions of internal moulds of protoconchs suggest that planktotrophic larval development was largely absent in the Cambrian and evolved at the Cambrian–Ordovician transition, mainly due to increasing benthic predation. The evolution of planktotrophic larval development offered advantages and opportunities such as more effective dispersal, enhanced gene flow between populations and prevention of inbreeding. Early gastropod larval shells were openly coiled and weakly sculptured. During the Mid‐ and Late Palaeozoic, modern tightly coiled larval shells (commonly with strong sculpture) evolved due to increasing predation pressure in the plankton. The presence of numerous Late Palaeozoic and Triassic gastropod species with planktotrophic larval development suggests sufficient primary production although direct evidence for phytoplankton is scarce in this period. Contrary to previous suggestions, it seems unlikely that the end‐Permian mass extinction selected against species with planktotrophic larval development. The molluscan classes with highest species diversity (Gastropoda and Bivalvia) are those which may have planktotrophic larval development. Extremely high diversity in such groups as Caenogastropoda or eulamellibranch bivalves is the result of high phylogenetic activity and is associated with the presence of planktotrophic veliger larvae in many members of these groups, although causality has not been shown yet. A new gastropod species and genus, Anachronistella peterwagneri, is described from the Late Triassic Cassian Formation; it is the first known Triassic gastropod with an openly coiled larval shell.

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Section: Planktotrophy As Inferred From Protoconch Morphology and Dimmentioning

confidence: 99%

“…Most Early Jurassic caenogastropods with preserved protoconchs have been reported from Germany (Schröder ; Gründel and Nützel ; Gründel , b, , ; Gründel et al . ; Schulbert and Nützel ). Again, the great majority had planktotrophic larval development.…”

Section: Gastropod Larval Ecology Through Timementioning

confidence: 99%

Larval ecology and morphology in fossil gastropods

Nützel

2014

Palaeontology

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“…The Jurassic Cryptaulax may have had a similar mode of nutrition (Kaim, 2012), preferring a soft-bottom substrate (cf. Schulbert and Nützel, 2013), but the Minas Viejas Cryptaulacids are clearly shallow water settlers. Nerineids are represented by Nerinea gachupinae and point to a low energy lagoonal environment (e.g., Sirna, 1995).…”

Section: Depositional Environment As Inferred By Mollusks Identified mentioning

confidence: 97%

Mollusks of the Upper Jurassic (upper Oxfordian-lower Kimmeridgian) shallow marine Minas Viejas Formation, northeastern Mexico

Zell

Beckmann

Stinnesbeck

et al. 2015

Journal of South American Earth Sciences

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“…Coelodiscus and Tatediscus are closely related to each other and form the family Coelodiscidae Gründel, 2013 (in Schulbert & Nützel), which ranges from the Early Pliensbachian to the Early Aalenian (Schulbert & Nützel 2013, Teichert & Nützel 2015. They occur in oxygen-controlled environments in Central Europe and England (for 236 Figure 6.…”

Section: Discussionmentioning

confidence: 99%