Some observations on the geological history of the holoplanktonic gastropods

Hart, Malcolm B.; Wall-Palmer, Deborah; Janssen, Arie W.; Smart, Christopher W.

doi:10.1016/j.pgeola.2020.07.009

Cited by 3 publications

(1 citation statement)

References 54 publications

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“…Nor would it be easy to reconcile with their fossil record, which is based entirely on the shells. Heteropod-like gastropods may date back to the Triassic [25], underwent a rapid radiation in the early Jurassic, perhaps as a response to widespread bottom-water anoxia [26]. The five clades identified in the early Mesozoic have no obvious phylogenetic link to the younger heteropods that gave rise to the extant taxa [27].…”

Section: Discussionmentioning

confidence: 99%

A possible home for a bizarre Carboniferous animal: is Typhloesus a pelagic gastropod?

Morris

Caron

2022

Biol. Lett.

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By contrast to many previously enigmatic Palaeozoic fossils, the Carboniferous metazoan Typhloesus has defied phylogenetic placement. Here, we document new features, including possible phosphatized muscle tissues and a hitherto unrecognized feeding apparatus with two sets of ca 20 spinose teeth whose closest similarities appear to lie with the molluscan radula. The ribbon-like structure, located well behind the mouth area and deep into the anterior part of the body, is interpreted as being in an inverted proboscis configuration. Gut contents, mostly conodonts, in the midgut area demonstrate that Typhloesus was an active predator. This animal was capable of propelling itself in the water column using its flexible body and a prominent posterior fin. The affinity of Typhloesus as a pelagic mollusc remains problematic but may lie more closely with the gastropods. Heteropod gastropods share with Typhloesus an active predatory lifestyle and have a comparable general body organization, albeit they possess characteristic aragonitic shells and their origins in the Jurassic post-date Typhloesus . Typhloesus may represent an independent radiation of Mid-Palaeozoic pelagic gastropods.

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Section: Discussionmentioning

confidence: 99%

A possible home for a bizarre Carboniferous animal: is Typhloesus a pelagic gastropod?

Morris

Caron

2022

Biol. Lett.

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The mid-Cretaceous debate: Evidence from the foraminifera

Hart

2021

Cretaceous Research

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Holoplanktonic and Meroplanktonic Larvae in the Surface Waters of the Onnuri Vent Field in the Central Indian Ridge

Kim

Kang

Kim

2022

JMSE

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The dispersal of organisms in an isolated environment of a hydrothermal vent remains unclear. Here, we provide direct evidence that meroplanktonic larvae may migrate thousands of meters above the ocean floor. The morphological quantitative measurements of mesozooplankton were conducted in the Onnuri Vent Field (OVF), the Solitaire Fields (SF), and the reference site (ref-site). Only one species of bivalve larva that appeared at the OVF and the ref-site (0–200 m) was similar to Bathymodiolus spp. Sixteen species of gastropod larvae were distinguished, among which, species 1–4, 6, and 13 had holoplanktonic features (Atlanta, Oxygrus, and Limacina), whereas species 5, 7–12, and 14–16 had meroplanktonic features. Species 5, 11, and 12 appeared only at the OVF, 9 and 10 appeared only in the SF, 14–16 appeared only at the ref-site, and species 7 and 8 appeared in all surveyed stations. The species 5, 8, 12, 14, and 15 have morphological features similar to Vetulonia spp., and species 7 was similar to Lepetodrilidae; species 9–11 and 16 were similar to Phymorphynchus protoconchs. The morphologically distinguished mollusk larvae in the upper layers of the water column (0–200 m) indicate that larvae associated with deep-sea hydrothermal vents may disperse approximately 2000 m above the vents.

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Some observations on the geological history of the holoplanktonic gastropods

Cited by 3 publications

References 54 publications

A possible home for a bizarre Carboniferous animal: is Typhloesus a pelagic gastropod?

A possible home for a bizarre Carboniferous animal: is Typhloesus a pelagic gastropod?

The mid-Cretaceous debate: Evidence from the foraminifera

Holoplanktonic and Meroplanktonic Larvae in the Surface Waters of the Onnuri Vent Field in the Central Indian Ridge

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