Ordered phylogenomic subsampling enables diagnosis of systematic errors in the placement of the enigmatic arachnid order Palpigradi

On December 2019 the paper Ordered phylogenomic subsampling enables diagnosis of systematic errors in the placement of the enigmatic arachnid order Palpigradi was published (another result of an going fruitful collaboration between the laboratory of the Israel National Arachnid Collection and the Sharma Lab at University of Wisconsin-Madison).

This paper deals with the phylogentic position of the arachnid order Palpigradi. It is suggested that Palpigradi are sister to Solifugae with moderate support, yet agrees with a morphological homology of the position and structure of the coxal glands near the pedipalp coxa, found only in these two arachnid orders.

Palpigradi (micro-whip scorpions) is an enigmatic arachnid order with less than 100 described species, all are eyeless miniature (up to 3 mm) creatures with flagellum that are using their palps for walking, while their first pair of legs are used for sensing the environment.

It is very hard task to find paligradi in the field, and the knowen species are usually inhabit humid soil and caves.

Still there is no agreement among arachnologists on the topology of the arachnid phyologenetic tree and the relation between many arachnid orders. One broadly accepted phylogenetic relation is the clade Tetrapulmonata that include the arachnid orders with 4 booklungs (Araneae, Amblypygi, Uropygi and Schizomida).

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