A shark fauna from the Campanian of Hornby Island, British Columbia, Canada: an insight into the diversity of Cretaceous deep-water assemblages

Cappetta, Henri; Morrison, Kurt; Adnet, Sylvain

doi:10.1080/08912963.2019.1681421

Cited by 17 publications

(20 citation statements)

References 80 publications

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“…For instance, the extant Galeorhinus galeus and the odontaspidid genus Odontaspis occur from the surface to the outer shelves and down the slopes to possibly 1600 m, whereas Carcharias (the only other living representative of the para‐ or polyphyletic family Odontaspididae) is observed from 0 to 131 m depth, but mostly occurs between 15 and 25 m (Compagno 1984a , 1984b , 2003 ; Cappetta et al . 2019 ; Froese & Pauly 2019 ). However, extrapolating the palaeoecology of G. cuvieri and B. lerichei from only three extant sharks might represent a limitation because some triakids and odontaspidids in the past may have had different habitat preferences (e.g.…”

Section: Resultsmentioning

confidence: 99%

Diversity, palaeoecology and palaeoenvironmental significance of the Eocene chondrichthyan assemblages of the Bolca Lagerstätte, Italy

Marramà

Carnevale

Kriwet

2021

LET

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Over the last few years, the morphology, taxonomy and systematics of the cartilaginous fish taxa of the two main sites of the Bolca Lagerstätte, Italy, (Pesciara and Monte Postale sites) have been extensively discussed in a series of papers, resulting in a complete revision of this neglected component of the Eocene Tethyan ichthyofauna. Here, we provide a comprehensive overview of the diversity, palaeoecology and palaeoenvironmental significance of the two chondrichthyan assemblages of the Pesciara and Monte Postale sites. The assemblages include 14 shark species (Lamniformes and Carcharhiniformes) and batoids (Torpediniformes, Rhinopristiformes, Myliobatiformes, Platyrhinidae and Zanobatidae), as well as a single putative chimaeriform. The Pesciara and Monte Postale sites are characterized by eight chondrichthyan taxa each, but the taxonomic compositions are distinctly different reflecting the dissimilarities in the overall composition of both fish assemblages. Palaeoecological interpretations and habitat preferences of the two chondrichthyan assemblages are consistent with previously hypothesized palaeoenvironmental settings based on sedimentological, palaeontological and geochemical evidence. The chondrichthyan assemblages of the two sites appear to be constituted by ecologically vicariant taxa, with both characterized by a predominance of benthic species with durophagous/cancritrophic feeding modes. Taxonomic composition, habitat preferences and palaeobathymetric analyses support the hypothesis that both assemblages occupied tropical marine shallow waters (likely up to 50 m deep) of the inner portion of the Lessini Shelf. The taxonomic composition of both sites is considerably different from that of any other contemporaneous Tethyan and Boreal chondrichthyan assemblages.

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Section: Resultsmentioning

confidence: 99%

Diversity, palaeoecology and palaeoenvironmental significance of the Eocene chondrichthyan assemblages of the Bolca Lagerstätte, Italy

Marramà

Carnevale

Kriwet

2021

LET

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“…The validity of a fourth genus, Proteothrinax (Pfeil, 1983) is questionable due to the inadequate type material (Richter & Ward 1990; Cappetta et al . 2021). Teeth of the recently described genus Dykeius possess very slender and needle‐like cusps and are extraordinarily large, which excludes this genus for further comparison with the specimens reported here.…”

Section: Methodsmentioning

confidence: 99%

Earliest Danian outer neritic elasmobranch assemblages reveal an environmentally controlled faunal turnover at the Cretaceous–Palaeogene boundary in the northern Tethyan Realm (Austria)

Feichtinger,

Pollerspöck,

Harzhauser

et al. 2024

Papers in Palaeontology

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This study reports elasmobranch remains from two fossil‐rich horizons in the earliest Danian Olching Formation at Waidach, Austria. These outer neritic assemblages complement previous fine‐scale bulk‐sampling of latest Maastrichtian horizons at Waidach and document a regional elasmobranch faunal turnover across the Cretaceous–Palaeogene (K–Pg) boundary. The Danian assemblages show homogeneity in species richness and are dominated by squaliforms. The fauna comprises 16 species belonging to 12 genera including several new taxa (Centrodeania rugosa gen. et sp. nov., Centrodeania annae gen. et sp. nov., Incognitorapax fernsebneri gen. et sp. nov., Scyliorhinus alaformis sp. nov.). Comparison with latest Maastrichtian assemblages from Waidach revealed a marked faunal turnover across the K–Pg boundary associated with an increase in species richness and shift in abundance from Squaliformes to Carcharhiniformes. This is associated with marked environmental changes from a deep marine, dysoxic setting in the Maastrichtian to a more oxygenated, shallower environment in the earliest Danian. The turnover was driven by environmentally induced regional changes in species geographic ranges. High diversity in the Danian fauna suggests that the habitability of the corresponding palaeoenvironment was preserved or recovered immediately after the K–Pg event. Comparison with other elasmobranch assemblages across the K–Pg boundary highlights a strong control of local palaeoenvironmental settings over the timing and magnitude of the turnover. Our study emphasizes the importance of successive sampling to disentangle local from general patterns of faunal turnover during the K–Pg event and to better assess the consequences of this extinction event over elasmobranch diversity.

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“…Previously, all fossil material assigned to Propristiophorus was synonymized with Pristiophorus . Other Cretaceous pristiophorid remains have been found in Antarctica, Canada, Japan and Madagascar (Cappetta, Morrison, & Adnet, 2019; Cione et al., 2018; Gottfried & Rabarison, 1997; Nishimoto & Morozumi, 1979; Otero et al., 2014), while those reported for Australia (Kemp, 1991) apparently belong to teleost fish (Adnet & Cappetta, 2001). Remains of the extant genus Pliotrema are rarer, with only two finds reported thus far (Case, 1973; Welton, 1974), but indicate that the genus has existed since at least the Palaeocene (~66–56 Ma).…”

Section: Evolutionary History and Taxonomymentioning

confidence: 97%

“…The locations of fossil pristiophorid remains suggest that sawsharks had a much broader distribution in the past compared to the distributions shown by extant species, with regions such as Antarctica, Europe, New Zealand, western North America and South America once being inhabited by sawsharks (e.g. Cappetta et al., 2019; Engelbrecht et al., 2017; Keyes, 1982; Villafaña, Nielsen, Klug, & Kriwet, 2019; Welton, 1974). Keyes (1982) hypothesizes that the ancestor of all pristiophorids may have originated in Asia, particularly the ancestor of the genus Pristiophorus .…”

Section: Evolutionary History and Taxonomymentioning

confidence: 99%

The Sawshark Redemption: Current knowledge and future directions for sawsharks (Pristiophoridae)

Nevatte

Williamson

2020

Fish and Fisheries

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Sawsharks (Order: Pristiophoriformes, Family: Pristiophoridae) are a highly distinctive group of sharks, characterized by a tapering saw-like rostrum with a pair of elongate barbels on the ventral surface. Their unusual characteristics should attract attention; however, very few studies have been dedicated to sawsharks. As a result, our understanding of their biology and ecology is limited. However, information on aspects of their biology and ecology can be found in studies not directly focussing on sawsharks. This review provides a synthesis of information pertaining to the 10 recognized sawshark species following a comprehensive search of the scientific literature. We cover their distributions, habitat utilization, life histories, reproduction, trophic dynamics and sensory biology. Current knowledge on their unique rostral structures, the evolutionary history of pristiophorids, taxonomy, behaviour and threats to sawshark populations are also reviewed. This compilation serves as a foundation for sawshark researchers and highlights key knowledge gaps in this unique group of elasmobranchs, thereby beginning the sawshark redemption.

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A shark fauna from the Campanian of Hornby Island, British Columbia, Canada: an insight into the diversity of Cretaceous deep-water assemblages

Cited by 17 publications

References 80 publications

Diversity, palaeoecology and palaeoenvironmental significance of the Eocene chondrichthyan assemblages of the Bolca Lagerstätte, Italy

Diversity, palaeoecology and palaeoenvironmental significance of the Eocene chondrichthyan assemblages of the Bolca Lagerstätte, Italy

Earliest Danian outer neritic elasmobranch assemblages reveal an environmentally controlled faunal turnover at the Cretaceous–Palaeogene boundary in the northern Tethyan Realm (Austria)

The Sawshark Redemption: Current knowledge and future directions for sawsharks (Pristiophoridae)

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