Results 1 to 10 of about 468 (168)

Also looking like Limulus? – retinula axons and visual neuropils of Amblypygi (whip spiders) [PDF]

Frontiers in Zoology, 2018
Background Only a few studies have examined the visual systems of Amblypygi (whip spiders) until now. To get new insights suitable for phylogenetic analysis we studied the axonal trajectories and neuropil architecture of the visual systems of several ...
Tobias Lehmann, Roland R. Melzer
doaj   +4 more sources

New perspectives on the evolutionary history of xiphosuran development through comparison with other fossil euchelicerates

Frontiers in Ecology and Evolution, 2023
IntroductionEuchelicerata is a diverse group encompassing Xiphosura, Chasmataspidida, Eurypterida, and Arachnida. Xiphosura represents an extant group with a rich fossil record dating back to the Ordovician period.
Lorenzo Lustri, Jonathan B. Antcliffe, Farid Saleh, Carolin Haug, Lukáš Laibl, Russell J. Garwood, Russell J. Garwood, Joachim T. Haug, Allison C. Daley   +8 more
doaj   +2 more sources

The phylogeny and systematics of Xiphosura. [PDF]

PeerJ, 2020
Xiphosurans are aquatic chelicerates with a fossil record extending into the Early Ordovician and known from a total of 88 described species, four of which are extant. Known for their apparent morphological conservatism, for which they have gained notoriety as supposed ‘living fossils’, recent analyses have demonstrated xiphosurans to have an ...
Lamsdell JC.
europepmc   +4 more sources

New specimens of Bunaia woodwardi Clarke, 1919 (Euchelicerata): a new member of Offacolidae providing insight supporting the Arachnomorpha [PDF]

Royal Society Open Science
The rapid early diversification of arthropods has made understanding internal relationships within the group fiendish. Particularly unresolved is the origin of Euchelicerata, a clade consisting of the Prosomapoda (comprising the extant Xiphosura and ...
Lorenzo Lustri, Jonathan B. Antcliffe, Pierre Gueriau, Allison C. Daley   +3 more
doaj   +2 more sources

Digestion in the arachnid Mischonyx squalidus as a probable source of lipids to synthesize opiliones defense and communication molecules [PDF]

Scientific Reports
Opiliones (Arachnida) comprises approximately 7,000 species. Due to their lack of venom glands, their defense is mainly based on the secretion of scent glands, which also play roles in communication and antimicrobial activity.
Jefferson Oliveira Silva, Vincent Louis Viala, Renata Oliveira Dias, Clelia Ferreira, Walter R. Terra, Ricardo Pinto-da-Rocha, Adriana Rios Lopes   +6 more
doaj   +2 more sources

The effect of prolonged starvation on blood chemistry of horseshoe crab, Carcinoscorpius rotundicauda (Chelicerata: Xiphosura) [PDF]

Songklanakarin Journal of Science and Technology (SJST), 2018
This study investigated the effects of prolonged starvation on oxygen consumption, ammonia-N excretion, and blood chemistry of the horseshoe crab, Carcinoscorpius rotundicauda.
Saweit Chaimongkol, Itsara Intanai
doaj   +2 more sources

Diversity and evolutionary history of RNA viruses among different horseshoe crab species [PDF]

Journal of Virology
Horseshoe crabs (Xiphosura: Limulidae) are the sole surviving species of the class Merostomata, with only four extant species remaining today. Recent advances in metagenomic next-generation sequencing have unveiled a vast diversity of RNA viruses and non-
Yu-Hua Qi, Zhuang-Xin Ye, Ke-Hui Feng, Xiao-Wan Ma, Chuan-Xi Zhang, Meng-Hong Hu, Mang Shi, Jian-Ping Chen, Jun-Min Li   +8 more
doaj   +2 more sources

A Critical Appraisal of the Placement of Xiphosura (Chelicerata) with Account of Known Sources of Phylogenetic Error [PDF]

Systematic Biology, 2019
AbstractHorseshoe crabs (Xiphosura) are traditionally regarded as sister group to the clade of terrestrial chelicerates (Arachnida). This hypothesis has been challenged by recent phylogenomic analyses, but the non-monophyly of Arachnida has consistently been disregarded as artifactual. We re-evaluated the placement of Xiphosura among chelicerates using
Jesus A Ballesteros, Prashant P Sharma, Sharma Prashant P   +2 more
exaly   +3 more sources

Postembryonic development of the Tri-spine Horseshoe Crab Tachypleus tridentatus (Merostomata: Xiphosura) in a nursery habitat in the Philippines

Journal of Threatened Taxa, 2018
Populations of the Tri-spine Horseshoe Crab Tachypleus tridentatus have dramatically decreased over their distribution range and conservation efforts are now crucial.
Dorkas Kaiser, Sabine Schoppe
doaj   +2 more sources

An annotated catalogue of the horseshoe crabs (Xiphosura) held in the Museum für Naturkunde Berlin

Zoosystematics and Evolution, 2012
An annotated catalogue of the horseshoe crabs (Chelicerata: Xiphosura) in the collections of the Museum fur Naturkunde Berlin is presented. The collection contains no type material, but representatives of all four currently recognised living species are present.
Jason A Dunlop
exaly   +2 more sources