Increasing species sampling in chelicerate genomic-scale ... - Nature
2019年5月24日 · Here, the authors reconstruct the phylogeny of the Chelicerata using genomic-scale datasets, finding evidence for a monophyletic Acari and a single terrestrialisation of Arachnida.
螯肢亞門 - 维基百科，自由的百科全书
螯肢亞門 （學名： Chelicerata）是一類主要的 節肢動物，其下包括 鱟 、 蠍子 、 蜘蛛 及 蟎。 它們可能是於 寒武紀 演化 自海生 動物。 現存的水生 物種 包括 劍尾目 的4個 物種 及約1300種的 海蜘蛛。 陸地上已確認的螯肢亞門有超過7.7萬種，而未經確認的也有50萬種。 螯肢亞門像其他節肢動物般身體有節，並由 甲殼素 及 蛋白質 組成的 表皮 覆蓋。 它們的身體有兩個體區，即 頭胸部 及 腹部，而蟎在這兩部份的分隔則不可見。 它們口器前有一 螯肢。 大部份亞類都只會以螯肢 …
Mandibulate convergence in an armoured Cambrian stem …
2017年12月21日 · We found that a seven-segmented cephalon (or prosoma) and the modification of posterior trunk appendages initially involving the complete reduction of the endopod are characters potentially diagnostic of the “panchelicerate” or total-group Chelicerata clade and plesiomorphic conditions of Chelicerata.
Neuroanatomy in a middle Cambrian mollisoniid and the ... - Nature
2022年1月20日 · Our results suggest that M. symmetrica illustrates the ancestral organization of stem-group Chelicerata before the evolution of the derived neuroanatomical characters observed in Cambrian ...
4 Evolutionary tree of the major chelicerate groups and their …
Chelicerata is one of the major arthropod groups, characterized by a body divided into two tagmata, prosoma and opisthosoma, while the name Chelicerata refers to the chelicerae, the chelate first...
Higher-level phylogeny of Chelicerata showing well-resolved …
To assess these properties and their effects on tree stability, we constructed a phylogenomic dataset of Chelicerata wherein both lineages were sampled with three terminals, increasing the ...
Chelicerata - SpringerLink
What is the genetic basis for sexual dimorphism in Chelicerata, and is this mechanism homologous to its mandibulate equivalent? How does the visual system develop, and what is the developmental genetic relationship between faceted eyes (Xiphosura only), lateral eyes (most arachnids), and median ocelli (all Chelicerata)?
Chelicerate neural ground pattern in a Cambrian great ... - Nature
2013年10月16日 · Cambrian great appendage arthropods had heads that bore a claw-like appendage pair; neuroanatomical and phylogenetic analysis of a well-preserved Alalcomenaeus fossil reveals the relationship...
Chelicerata - Wikipedia
The subphylum Chelicerata (from Neo-Latin, from French chélicère, from Ancient Greek χηλή (khēlḗ) 'claw, chela ' and κέρας (kéras) 'horn') [1] constitutes one of the major subdivisions of the phylum Arthropoda. Chelicerates include the sea spiders, horseshoe crabs, and arachnids (including harvestmen, scorpions, spiders ...
(PDF) Chelicerata - ResearchGate
2015年1月1日 · Chelicerata is a subphylum of arthropods that includes terrestrial as well as marine animals. Both the fossil record and molecular data place the origin of the chelicerates over 500 million years...