Shell Heterostrophy in Early Ordovician Macluritella Kirk, 1927 and Its Implications for Phylogeny and Classification of Macluritoidea (Gastropoda)

Frýda, Jiří; Rohr, David M.

doi:10.1666/0022-3360(2006)080[0264:shieom]2.0.co;2

Cited by 15 publications

(39 citation statements)

References 36 publications

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“…A change in coiling direction during ontogeny is also present in other Palaeozoic gastropod groups but occurs within the teleoconch and therefore does not represent larval heterostrophy (e.g. Frýda and Rohr ; Frýda and Ferrová ). Heterobranch larvae are generally smaller than caenogastropod larvae (Page and Ferguson ).…”

Section: The Gastropod Protoconchmentioning

confidence: 99%

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: The Gastropod Protoconchmentioning

confidence: 99%

Larval ecology and morphology in fossil gastropods

Nützel

2014

Palaeontology

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“…The oldest evidence of shell heterostrophy in the class Gastropoda was documented by Frýda & Rohr (2006) in Macluritella stantoni Kirk, 1927, from the Early Ordovician of Colorado. The early whorls of this species are openly and dextrally coiled; the later teleoconch whorls are sinistrally coiled (as in all members of the Macluritoidea Carpenter, 1861).…”

Section: Shell Heterostrophy In Paleozoic Gastropodsmentioning

confidence: 99%

“…Macluritella may be interpreted as dextrally orthostrophic during its early ontogeny, and thus at this ontogenetic stage it had the same type of the soft bodyshell arrangement (anatomically dextral body in a dextrally coiled shell) as the vast majority of living and fossil gastropods. The latter interpretation of the oldest macluritid genus suggested that the Macluritoidea evolved from the dextrally orthostrophic gastropods, and dextral hyperstrophy is their derivative, and not a primary shell feature (Frýda & Rohr 2006). The phylogenetic relationships of the Macluritoidea, as well as their subsequent fate, are still a matter of discussion (Linsley & Kier 1984;Dzik 1983;Frýda 1992;Wagner 1999;Frýda & Rohr 2004.…”

Section: Shell Heterostrophy In Paleozoic Gastropodsmentioning

confidence: 99%

The oldest evidence of non-coaxial shell heterostrophy in the Class Gastropoda

Frýda¹,

Ferrová²

2011

Bull. Geosci.

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The term shell heterostrophy describes the condition where the shell whorls coil in one direction during one portion of a gastropod's life, and in the other direction for another portion. In the present paper, the oldest evidence of non-coaxial shell heterostrophy in the Class Gastropoda is documented in the new species Koneprusellia zaki sp. nov. (Porcellioidea, Archaeogastropoda), coming from the Early Devonian of the Barrandian area (Bohemia). A brief analysis of the occurrences of this shell's morphological features, among the Paleozoic gastropods, revealed that the shell heterostrophy was present in at least three unrelated gastropod lineages: in the clades Heterobranchia (Devonian-Recent), Macluritoidea (Ordovician), and Porcellioidea (Silurian-Cretaceous).•

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“…Use of fossil data reveals a more complicated evolutionary scenario than analyses based solely on living taxa due to extinction of several gastropod clades (Figure 10.3). Many Paleozoic (especially Early Paleozoic) gastropods had open-coiled protoconchs (e.g., Hynda 1986;Frýda 1999a;Dzik 1994Dzik , 1999Nützel and Frýda 2003;Rohr 2004, 2006;Nützel et al 2006, and references therein), which are known only among a few highly derived pteropods today (see Bandel and Hemleben 1995). Indeed, many of these protoconchs are nearly orthoconic, although most are simply widely umbilicate.…”

Section: Relationships Inferred From Protoconch Morphologymentioning

confidence: 99%