Dionycha

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Dionycha
Marpissa muscosa front (aka).jpg
Marpissa muscosa
Scientific classification e
Kingdom: Animalia
Phylum: Arthropoda
Subphylum: Chelicerata
Class: Arachnida
Order: Araneae
Infraorder: Araneomorphae
Clade: Entelegynae
Clade: Dionycha
Diversity[citation needed]
17 families

The Dionycha are a clade of spiders (Araneomorphae:Entelegynae), characterized by the possession of two tarsal claws with tufts of hairs (setae) beside them, which produce strong adhesion, enabling some species to climb glass.[1] The circumscription of the group has varied widely; a 2014 analysis resulted in about 20 families, including Salticidae (jumping spiders), Thomisidae (crab spiders), and Clubionidae.[2] Spiders in this group have better senses (sight, hearing) than others, some even show courtship dances and songs.[citation needed]

The Dionycha are now considered to be a subgroup of the larger RTA clade.[1] Most species hunt their prey instead of building webs.

There are no cribellate members in the Dionycha.[3]

Today it is thought that the reduction of the third claw present in ancestral spiders evolved several times independently,[2] so this alone is not a criterion that defines the clade.

Families[edit]

In 2014, Martín J. Ramírez published a major study of the phylogeny of Dionycha. He included the families listed below, where * means that the family may not be monophyletic or there is some other reason why its inclusion is not straightforward. Two subclades were found: the "OMT clade", marked by the possession of an oblique median tapetum, and the "CTC clade", nested within the OMT clade, marked by a particular kind of claw tuft clasper.[2]

Dionycha

Footnotes[edit]

  1. ^ a b Garrison, Nicole L.; Rodriguez, Juanita; Agnarsson, Ingi; Coddington, Jonathan A.; Griswold, Charles E.; Hamilton, Christopher A.; Hedin, Marshal; Kocot, Kevin M.; Ledford, Joel M. & Bond, Jason E. (2015). "Spider phylogenomics: untangling the Spider Tree of Life". PeerJ PrePrints. 3: e1852. doi:10.7287/peerj.preprints.1482v1. 
  2. ^ a b c Ramírez (2014).
  3. ^ Griswold et al. 1999

References[edit]

  • J. Bosselaers and R. Jocqué. 2002. Studies in Corinnidae: cladistic analysis of 38 corinnid and liocranid genera, and transfer of Phrurolithinae. Zoologica Scripta 31:241-270.
  • J. A. Coddington and H. W. Levi. 1991. Systematics and evolution of spiders (Araneae). Annual Review of Ecology and Systematics 22:565-592.
  • Griswold, C.E., Coddington, J.A., Platnick, N.I. and Forster, R.R. (1999). Towards a Phylogeny of Entelegyne Spiders (Araneae, Araneomorphae, Entelegynae). Journal of Arachnology 27:53-63. PDF
  • Ramírez, M. (2014). The morphology and phylogeny of Dionychan spiders (Araneae: Araneomorphae). Bulletin of the American Museum of Natural History. Retrieved 2015-10-31. 

External links[edit]