A new Ordovician eurypterid (Arthropoda: Chelicerata) from southeast Turkey: Evidence for a cryptic Ordovician record of Eurypterida

Lamsdell, James C.; Hoşgör, İzzet; Selden, Paul A.

doi:10.1016/j.gr.2012.04.006

Cited by 29 publications

(23 citation statements)

References 61 publications

(84 reference statements)

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“…The topology is predominantly congruent with that retrieved by Lamsdell et al [47], while the intrarelationships of the expanded Stylonurina is the same as in earlier analyses [48,49] and the resolution of the pterygotoids is identical to the analysis of Braddy et al [51]. The result differs from previous hypotheses in splitting the two constituent clades of Dolichopteridae, resulting in the family as presently defined being paraphyletic.…”

Section: Resultssupporting

confidence: 77%

“…For the phylogenetic analysis, the matrix of Lamsdell et al [47] was expanded and partially combined with the existing Stylonurina matrix [48-50] and the pterygotoid matrix of Braddy et al [51], resulting in a new matrix consisting of 104 characters and 63 taxa, which can be found in the Additional file 1 along with character descriptions. All of the taxa from Lamsdell et al [47] and Braddy et al [51] were included along with the addition of Laurieipterus elegans (Laurie, 1899), Hardieopterus macrophthalmus (Laurie, 1892), Kokomopterus longicaudatus (Clarke and Ruedemann, 1912), Drepanopterus pentlandicus (Laurie, 1892), Megarachne servinei Hünicken, 1980, and Hibbertopterus scouleri (Hibbert, 1836) from the Stylonurina matrix so that each major stylonurine clade was represented by at least two taxa.…”

Section: Methodsmentioning

confidence: 99%

“…All of the taxa from Lamsdell et al [47] and Braddy et al [51] were included along with the addition of Laurieipterus elegans (Laurie, 1899), Hardieopterus macrophthalmus (Laurie, 1892), Kokomopterus longicaudatus (Clarke and Ruedemann, 1912), Drepanopterus pentlandicus (Laurie, 1892), Megarachne servinei Hünicken, 1980, and Hibbertopterus scouleri (Hibbert, 1836) from the Stylonurina matrix so that each major stylonurine clade was represented by at least two taxa. Finally, Jakelopterus howelli (Kjellesvig-Waering and Størmer, 1952), Strobilopterus proteus sp.…”

Section: Methodsmentioning

confidence: 99%

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Babes in the wood – a unique window into sea scorpion ontogeny

Lamsdell

Selden

2013

BMC Evol Biol

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BackgroundFew studies on eurypterids have taken into account morphological changes that occur throughout postembryonic development. Here two species of eurypterid are described from the Pragian Beartooth Butte Formation of Cottonwood Canyon in Wyoming and included in a phylogenetic analysis. Both species comprise individuals from a number of instars, and this allows for changes that occur throughout their ontogeny to be documented, and how ontogenetically variable characters can influence phylogenetic analysis to be tested.ResultsThe two species of eurypterid are described as Jaekelopterus howelli (Kjellesvig-Waering and Størmer, 1952) and Strobilopterus proteus sp. nov. Phylogenetic analysis places them within the Pterygotidae and Strobilopteridae respectively, both families within the Eurypterina. Jaekelopterus howelli shows positive allometry of the cheliceral denticles throughout ontogeny, while a number of characteristics including prosomal appendage length, carapace shape, lateral eye position, and relative breadth all vary during the growth of Strobilopterus proteus.ConclusionsThe ontogeny of Strobilopterus proteus shares much in common with that of modern xiphosurans, however certain characteristics including apparent true direct development suggest a closer affinity to arachnids. The ontogenetic development of the genital appendage also supports the hypothesis that the structure is homologous to the endopods of the trunk limbs of other arthropods. Including earlier instars in the phylogenetic analysis is shown to destabilise the retrieved topology. Therefore, coding juveniles as individual taxa in an analysis is shown to be actively detrimental and alternative ways of coding ontogenetic data into phylogenetic analyses should be explored.

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Section: Resultssupporting

confidence: 77%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Babes in the wood – a unique window into sea scorpion ontogeny

Lamsdell

Selden

2013

BMC Evol Biol

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“…This diversity suggests a Gondwanan origin for Chelicerata, an idea that is also supported by the recent discovery of a eurypteroid in the Late Ordovician of SE Turkey (Lamsdell et al 2013). The Fezouata horseshoe crabs are among the most abundant fossils in the fauna and are remarkably modern in aspect, with the segments that make up the posterior division of the body partially fused in a step towards the morphology of modern Limulus (Fig.…”

Section: Extending Temporal Rangesmentioning

confidence: 54%

The Fezouata fossils of Morocco; an extraordinary record of marine life in the Early Ordovician

Roy

Briggs

Gaines

2015

JGS

127

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The discovery of the Fezouata biota in the latest Tremadocian of southeastern Morocco has significantly changed our understanding of the early Phanerozoic radiation. The shelly fossil record shows a well-recognized pattern of macroevolutionary stasis between the Cambrian Explosion and the Great Ordovician Biodiversification Event, but the rich soft-bodied Fezouata biota paints a different evolutionary picture. The Fezouata assemblage includes a considerable component of Cambrian holdovers alongside a surprising number of crown group taxa previously unknown to have evolved by the Early Ordovician. Study of the Fezouata biota is in its early stages, and future discoveries will continue to enrich our view of the dynamics of the early Phanerozoic radiation and of the nature of the fossil record.Supplementary material:A complete faunal list is available at http://www.geolsoc.org.uk/SUP18843.

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“…However, it is probable that the form of the metastoma in Houia is relatively derived because the lineage must have diverged from the dekatriatan stem prior to the Middle Ordovician (Lamsdell et al . 2013a), so the ancestral form of the metastoma cannot be known with certainty. The enlargement of the plate in Houia could be linked to the width of the carapace, which is much broader than in any eurypterid or chasmataspidid.…”

Section: Discussionmentioning

confidence: 99%

An unusual euchelicerate linking horseshoe crabs and eurypterids, from the Lower Devonian (Lochkovian) of Yunnan, China

2015

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Two new specimens of the xiphosuran Kasibelinurus yueya Lamsdell, Xue & Selden, 2013 are described, from the same horizon and locality as the type. The new specimens are conspecific with the type, but show ventral morphology, which considerably alters interpretation of the species. It can no longer be referred to Kasibelinurus Pickett, 1993, and a new genus, Houia n. gen., is erected. Houia shows a unique combination of xiphosurid and chasmataspidid/eurypterid characteristics such as lack of opisthosomal pleura and possession of a large, ventral metastomal plate. Phylogenetic analysis of all the major chelicerate orders suggests that Houia branched from the main euchelicerate lineage prior to the divergence of the three constituent clades of the Dekatriata Lamsdell, 2013 (Eurypterida, Arachnida, Chasmataspidida). Together with bunodids and pseudoniscids, Houia provides evidence for basal dekatriatans persisting into the middle Palaeozoic alongside eurypterids and arachnids and that the morphological diversity of these basal forms was greater than previously thought.

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A new Ordovician eurypterid (Arthropoda: Chelicerata) from southeast Turkey: Evidence for a cryptic Ordovician record of Eurypterida

Cited by 29 publications

References 61 publications

Babes in the wood – a unique window into sea scorpion ontogeny

Babes in the wood – a unique window into sea scorpion ontogeny

The Fezouata fossils of Morocco; an extraordinary record of marine life in the Early Ordovician

An unusual euchelicerate linking horseshoe crabs and eurypterids, from the Lower Devonian (Lochkovian) of Yunnan, China

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