Early Triassic gastropods from Salt Range, Pakistan

Kaim, Andrzej; Nützel, Alexander; Hautmann, Michael; Bucher, Hugo

doi:10.3140/bull.geosci.1395

Cited by 18 publications

(12 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Only one younger occurrence of the bellerophontoid Dicellonema is reported from the Anisian of Tibet (Yü ), but remains controversial (see Kaim et al . for discussion). However, in the data from the Thaynes Group, there is no indication that the nekton crisis had an equivalent in benthic ecosystems.…”

Section: Discussionmentioning

confidence: 96%

“…from the Salt Range, Pakistan, Naticopsis from Oman (Kaim et al . ; Wheeley and Twitchett ). Due to a low number of shell characters, their taxonomy is very difficult especially if the preservation is not excellent.…”

Section: Discussionmentioning

confidence: 98%

“…The present material seems to be close to Strobeus batteni as described by Kaim et al . () from the early Smithian of Pakistan. These authors also included material from the Sinbad Formation, which was described as Strobeus cf.…”

Section: Systematic Palaeontologymentioning

confidence: 92%

See 2 more Smart Citations

Recovery of benthic marine communities from the end‐Permian mass extinction at the low latitudes of eastern Panthalassa

et al. 2013

View full text Add to dashboard Cite

show abstract

Section: Discussionmentioning

confidence: 96%

Section: Discussionmentioning

confidence: 98%

See 1 more Smart Citation

Recovery of benthic marine communities from the end‐Permian mass extinction at the low latitudes of eastern Panthalassa

et al. 2013

View full text Add to dashboard Cite

show abstract

“…Protoconchs are only known for very few Early Triassic gastropod species from the Sinbad Limestone (Utah), the Salt Range (Pakistan) and Far East Russia (Batten and Stokes ; Nützel and Erwin ; Nützel and Schulbert ; Kaim ; Kaim et al . ). The published protoconch images suggest that Early Triassic caenogastropods, neritimorphs and heterobranchs with preserved protoconchs had planktotrophic larval development, although more detailed studies are needed.…”

Section: Gastropod Larval Ecology Through Timementioning

confidence: 97%

Larval ecology and morphology in fossil gastropods

Nützel

2014

Palaeontology

View full text Add to dashboard Cite

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.

show abstract

“…) and from the Smithian–Spathian rocks of the Salt Range, Pakistan (Kaim et al . ). This material from Pakistan and China has also been reported in open nomenclature as Naticopsis sp.…”

Section: Resultsmentioning

confidence: 97%

New data from Oman indicate benthic high biomass productivity coupled with low taxonomic diversity in the aftermath of the Permian–Triassic Boundary mass extinction

Brosse

Bucher

Baud³

et al. 2019

LET

View full text Add to dashboard Cite

A new Early Triassic marine fauna is described from an exotic block (olistolith) from the Ad Daffah conglomerate in eastern Oman (Batain), which provides new insights into the ecology and diversity during the early aftermath of the Permian–Triassic Boundary mass extinction. Based on conodont quantitative biochronology, we assign a middle Griesbachian age to the upper part of this boulder. It was derived from an offshore seamount and yielded both nektonic and benthic faunas, including conodonts, ammonoids, gastropods and crinoid ossicles in mass abundance. This demonstrates that despite the stratigraphically near extinction at the Permian–Triassic Boundary, Crinoidea produced enough biomass to form crinoidal limestone as early as middle Griesbachian time. Baudicrinus, previously placed in Dadocrinidae, is now placed in Holocrinidae; therefore, Dadocrinidae are absent in the Early Triassic, and Holocrinidae remains the most basal crown‐group articulates, originating during the middle Griesbachian in the Tethyan Realm. Abundant gastropods assigned to Naticopsis reached a shell size larger than 20 mm and provide another example against any generalized Lilliput effect during the Griesbachian. Whereas the benthic biomass was as high as to allow the resumption of small carbonate factories, the taxonomic diversity of the benthos remained low compared to post‐Early Triassic times. This slow benthic taxonomic recovery is here attributed to low competition within impoverished post‐extinction faunas.

show abstract

Early Triassic gastropods from Salt Range, Pakistan

Cited by 18 publications

References 18 publications

Recovery of benthic marine communities from the end‐Permian mass extinction at the low latitudes of eastern Panthalassa

Recovery of benthic marine communities from the end‐Permian mass extinction at the low latitudes of eastern Panthalassa

Larval ecology and morphology in fossil gastropods

New data from Oman indicate benthic high biomass productivity coupled with low taxonomic diversity in the aftermath of the Permian–Triassic Boundary mass extinction

Contact Info

Product

Resources

About