Basal articulation of the palps and ovigers in Antarctic Colossendeis (Pycnogonida; Colossendeidae)

Cano-Sánchez, Esperanza; López–González, Pablo J.

doi:10.1186/s10152-016-0474-7

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…Articulation of podomeres is not preserved well enough to be interpreted, except for the proximalmost parts using RTI (Fig. 9): we are able to identify at least three distinct structures, which correspond either to the three proximalmost podomeres of the ovigers (coxae 1, 2 and 3) or the two first proximalmost podomeres of the ovigers (coxae 1 and 2) and the ovigers' basal process ( sensu Cano‐Sánchez & López‐González 2017). The geniculation at the oviger's mid‐length is interpreted as the femoro‐patellar geniculation.…”

Section: Systematic Palaeontologymentioning

confidence: 91%

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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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Section: Systematic Palaeontologymentioning

confidence: 91%

“…Cephalic knobs already spotted by Sabroux et al . (2019) are interpreted as palps or palp basal process sensu Cano‐Sánchez & López‐González (2017) (Fig. 9).…”

Section: Systematic Palaeontologymentioning

confidence: 99%

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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“…El tamaño de los picnogónidos varía entre 1 mm a 70 cm, son crípticos en el substrato que habitan (Cano-Sánchez & López-González, 2015). Se distribuyen desde profundidades de unos pocos metros (3 a 10 m) y hasta profundidades abisales a más de 7 000 m incluyendo ventilas hidrotermales (Sabroux et al 2017), por lo que se consideran los quelicerados de mayor profundidad (Ros-Santaella, 2004).…”

Section: Introductionunclassified

“…En su asociación con otros invertebrados, algunos actúan como depredadores o como parásitos, los depredadores consumen organismos enteros, entre ellos anélidos (Cano-Sánchez & López-González, 2015). Los parásitos pueden ser endoparásitos o ectoparásitos de moluscos y actinias (Dietz et al 2018).…”

Section: Introductionunclassified

Picnogónidos (Arthropoda: Pycnogonida: Pantopoda) de la bahía de Banderas, Pacífico mexicano

Villatoro-Ortiz¹,

Salazar-Silva²

2022

Rev. Cien. Mar. Cost.

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Este estudio reporta la composición de especies de picnogónidos asociados a la fauna incrustante de muelles de una marina turística recolectadas en septiembre y octubre del año 2011, y en abril y junio del año 2012, y las muestras de algas, coral muerto y de tubos de quetopteridos, anélidos tubícolas recolectados mediante buceo libre en sitios de playa de febrero a abril del 2018. Los sitios estudiados, la marina de la Cruz de Huanacaxtle y playas aledañas se localizan en el Pacífico mexicano, en la costa norte de la bahía de Banderas en el estado de Nayarit. Se examinaron en total 78 especímenes que pertenecen a cinco familias, seis géneros y nueve especies; se presenta una lista sistemática; para cada especie se incluye una descripción breve, información de su distribución y abundancia en los sitios estudiados. En los muelles de la marina de la Cruz de Huanacaxtle se registraron 56 especímenes correspondientes a tres especies. En las playas La Manzanilla, Burros, La Lancha y playa de la Isla María Cleofás se presentaron ochos especies, seis de ellas no presentes en los muelles. Las especies más abundantes fueron Anoplodactylus sp. con 32 especímenes (41%) y Nymphon lituus con 24 (31%), esta última fue dominante en los muelles de la marina. El estudio provee los primeros registros de picnogónidos para la costa norte de la bahía de Banderas, México, contribuye al conocimiento de la biodiversidad del Pacífico mexicano y documenta la pycnofauna asociada a comunidades bioincrustantes de una marina náutica.

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Analyzing drivers of speciation in the Southern Ocean using the sea spider species complex Colossendeis megalonyx as a test case

et al. 2020

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Colossendeis megalonyx Hoek, 1881 has the broadest distribution of all sea spiders in the Southern Ocean. Previous studies have detected several evolutionarily young lineages within this taxon and interpreted them as a result of allopatric speciation in a few shelf refuges during glacial maxima. However, alternative scenarios such as ecological speciation in sympatry have rarely been considered or tested. Here, we generated the most extensive genomic and morphometric data set on the C. megalonyx species complex to (i) comprehensively describe species diversity, (ii) explore intraspecific connectivity between populations located around Antarctica, and (iii) systematically test for positive selection indicative of adaptive speciation. We successfully applied a target hybrid enrichment approach and recovered all 1607 genes targeted. Phylogenomic analysis was consistent with previous findings and, moreover, increased the resolution of branching within lineages. We found specimens of phylogenetically well-separated lineages occurring in sympatry to be genetically distinct from each other and gene flow between geographically separated populations of the same lineages to be restricted. Evidence for positive selection was found for four genes associated with structural and neuronal functions. Hence, there is an indication for positive selection in the C. megalonyx species complex, yet its specific contribution to the speciation process remains to be explored further. Finally, morphometric analyses revealed multiple significant differences between lineages, but a clear separation proved difficult. Our study highlights the relevance of positive selection as a potential driver for speciation in the Southern Ocean.

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Basal articulation of the palps and ovigers in Antarctic Colossendeis (Pycnogonida; Colossendeidae)

Cited by 7 publications

References 15 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)

Picnogónidos (Arthropoda: Pycnogonida: Pantopoda) de la bahía de Banderas, Pacífico mexicano

Analyzing drivers of speciation in the Southern Ocean using the sea spider species complex Colossendeis megalonyx as a test case

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