Phylogeny of sea spiders (Arthropoda: Pycnogonida) inferred from mitochondrial genome and 18S ribosomal RNA gene sequences

Sabroux, Romain; Corbari, Laure; Hassanin, Alexandre

doi:10.1016/j.ympev.2023.107726

Cited by 6 publications

(13 citation statements)

References 69 publications

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“…2021; Sabroux et al . 2023). However, this hypothesis relied on the interpretation of anterior cephalic features as chelifores, an interpretation that our new data do not support.…”

Section: Discussionmentioning

confidence: 99%

“…(2007a): Palaeopycnogonides gracilis as a member of Ammotheidae, calibrating the Ammotheidae + Pallenopsidae node (crown Ammotheoidea sensu Sabroux et al . 2023); Colossopantopodus boissinensis as a Colossendeidae, for the Colossendeidae + Pycnogonidae + Rhynchothoracidae node (crown Colossendeoidea sensu Sabroux et al . 2023); and Palaeoendeis elmii as an Endeidae, calibrating the Endeidae + Phoxichilidiidae node (crown Phoxichilidioidea sensu Bamber 2007).…”

Section: Discussionmentioning

confidence: 99%

“…2023); Colossopantopodus boissinensis as a Colossendeidae, for the Colossendeidae + Pycnogonidae + Rhynchothoracidae node (crown Colossendeoidea sensu Sabroux et al . 2023); and Palaeoendeis elmii as an Endeidae, calibrating the Endeidae + Phoxichilidiidae node (crown Phoxichilidioidea sensu Bamber 2007). Our reinvestigation of the La Voulte material either confirms ( Palaeoendeis ), refines ( Colossopantopodus ) or refutes ( Palaeopycnogonides ) these initial taxonomic interpretations.…”

Section: Discussionmentioning

confidence: 99%

“…Phylogenetic relationships are those supported by Sabroux et al . (2023). Node ages are shown as recovered by Ballesteros et al .…”

Section: Discussionmentioning

confidence: 99%

“…In the phylogenetic framework of Sabroux et al . (2023), these fossils are most appropriately used to calibrate the nodes Colossendeidae and Endeidae + Phoxichilidiidae. Finally, we suggest that rather than attributing Palaeopycnogonides gracilis to Ammotheidae, this fossil should be assigned to its own family: Palaeopycnogonididae.…”

Section: Discussionmentioning

confidence: 99%

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New insights into the sea spider fauna (Arthropoda, Pycnogonida) of La Voulte‐sur‐Rhône, France (Jurassic, Callovian)

Sabroux

Edgecombe

Pisani

et al. 2023

Papers in Palaeontology

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Three species of sea spider (Arthropoda, Pycnogonida) have been described from the Middle Jurassic (Callovian) Konservat‐Lagerstätte of La Voulte‐sur‐Rhône: Palaeopycnogonides gracilis, Colossopantopodus boissinensis and Palaeoendeis elmii. These fossils were initially attributed to three extant families or superfamilies, justifying their use as calibration points in a recent tree‐dating analysis. However, their taxonomic affinities are still debated. Our knowledge of the morphology of these Jurassic sea spiders is limited by prior investigation with only light microscopy and radiographs, such that further morphological details such as cephalic appendages (chelifores, palps, ovigers) remain poorly documented. Here, we reinvestigate the La Voulte‐sur‐Rhône fossils using x‐ray microtomography and reflectance transformation imaging. A new specimen, tentatively attributed to P. gracilis, was found using x‐ray microtomography, while another fossil initially interpreted as Palaeoendeis elmii may also be related to this species. We attribute all fossils to Pantopoda, crown‐group Pycnogonida. Palaeopycnogonides gracilis had ovigers in at least one sex and had chelifores and palps that were either reduced or absent. Together, the cephalic appendage set and the structure of the ovigers are unique among Pantopoda, and this species is reassigned to the new family Palaeopycnogonididae. Colossopantopodus boissinensis lacked chelifores but had palps and ovigers, the latter with the typical structure shown by extant Colossendeinae, to which we attribute the fossil. The absence of chelifores and palps in Palaeoendeis elmii and the structure of its ovigers indicate affinities with Endeidae. The impact of these new taxonomic assignments on the way Jurassic sea spiders can be used as fossil calibrations is discussed.

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“…2021; Sabroux et al . 2023). However, this hypothesis relied on the interpretation of anterior cephalic features as chelifores, an interpretation that our new data do not support.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

“…Phylogenetic relationships are those supported by Sabroux et al . (2023). Node ages are shown as recovered by Ballesteros et al .…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

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New insights into the sea spider fauna (Arthropoda, Pycnogonida) of La Voulte‐sur‐Rhône, France (Jurassic, Callovian)

Sabroux

Edgecombe

Pisani

et al. 2023

Papers in Palaeontology

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Spawning and larval development of Colossendeis megalonyx, a giant Antarctic sea spider

Moran,

Lobert,

Toh

2024

Ecology

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Newly discovered morphology of the Silurian sea spider Haliestes and its implications

Siveter,

Sabroux,

Briggs

et al. 2023

Papers in Palaeontology

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The three‐dimensionally preserved Haliestes dasos from the Silurian (Wenlock) Lagerstätte is the most complete fossil sea spider and the oldest unambiguous pycnogonid known from the fossil record. The discovery of two new specimens to add to the holotype reveals new features including proximal annulations of the appendages and segmentation of the trunk end, critical details for comparison with pycnogonids from the Devonian (Emsian) Hunsrück Slate and for the interpretation of the evolutionary significance of Palaeozoic genera. There is some evidence of sexual dimorphism. Haliestes dasos was nektobenthic and its morphology indicates an unusual mode of feeding compared with living pycnogonids. The new morphological features of H. dasos are closely similar to those in Palaeoisopus problematicus from the Hunsrück Slate and it clearly belongs, together with that species, in stem Pycnogonida and not the crown group.

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Phylogeny of sea spiders (Arthropoda: Pycnogonida) inferred from mitochondrial genome and 18S ribosomal RNA gene sequences

Cited by 6 publications

References 69 publications

New insights into the sea spider fauna (Arthropoda, Pycnogonida) of La Voulte‐sur‐Rhône, France (Jurassic, Callovian)

New insights into the sea spider fauna (Arthropoda, Pycnogonida) of La Voulte‐sur‐Rhône, France (Jurassic, Callovian)

Spawning and larval development of Colossendeis megalonyx, a giant Antarctic sea spider

Newly discovered morphology of the Silurian sea spider Haliestes and its implications

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