title: Claw tuft setae of tarantulas (Araneae, Mygalomorphae, Theraphosidae) and the production of fibrous materials. Do tarantulas eject silk from their feet?
metadata.name: dc.contributor.author
metadata.value: Hajer, Jaromír
metadata.lang: -
metadata.name: dc.contributor.author
metadata.value: Řeháková, Dana
metadata.lang: -
metadata.name: dc.date.accessioned
metadata.value: 2019-11-22T20:24:37Z
metadata.lang: -
metadata.name: dc.date.available
metadata.value: 2019-11-22T20:24:37Z
metadata.lang: -
metadata.name: dc.date.issued
metadata.value: 2019-09
metadata.lang: -
metadata.name: dc.identifier.citation
metadata.value: Hajer, J. and Řeháková, D. 2019. Claw tuft setae of tarantulas (Araneae, Mygalomorphae, Theraphosidae) and the production of fibrous materials. Do tarantulas eject silk from their feet? Bio. Comm. 64(3): 169–182.
metadata.lang: en_GB
metadata.name: dc.identifier.other
metadata.value: https://doi. org/10.21638/spbu03.2019.301
metadata.lang: -
metadata.name: dc.identifier.uri
metadata.value: http://hdl.handle.net/11701/16622
metadata.lang: -
metadata.name: dc.description.abstract
metadata.value: The study focused on the specialised tarsal setae of tarantulas Avicularia metallica
  and Heteroscodra maculata, and the fibrous and non-fibrous material produced
  by them. When irritated spiders moved along smooth, perpendicularlyoriented
  glass walls not covered in silk, the claw tuft setae, located at the tips
  of the tarsal segments, left behind footprints containing two types of fibrous
  material. Using electron scanning microscopy, it was discovered that these represent
  fragments of parallelly oriented bundles of hollow fibres forming the
  shafts of the setae and their lateral branches (1), as well as clusters of contracted
  nanofibrils which aggregated at the ends of these fibres (2). During climbing,
  this fibrous material was detected both on the substratum on which the spiders
  were moving, and also on their claw tuft setae. The climbing activity of irritated
  tarantulas is also associated with the secretion of a fluid which dries on contact
  with air. This secretion acts as an adhesive and facilitates the movement of tarantulas
  on smooth surfaces, but while doing so it also glues together the distal,
  lamellar parts of the groups of setae which are in contact with the substratum
  during climbing. There are no such claw tuft setae morphological changes observed
  in undisturbed tarantulas, moving freely around their tube-like shelters
  and on the surfaces of objects covered with silk which they have produced. The
  sources of the air-drying secretion are probably the tubular fibres forming the
  shafts of pretarsal setae. The bundles of hollow fibres are an example of a system
  that produces secretions via a surficial pathway. The spinnerets and silkproducing
  glands associated with them, located in the opisthosoma, represent
  a system that produces silk via a systemic pathway. However, the results of observational
  studies have not confirmed the ability of tarantulas’ feet to produce
  silk fibres of the same, or at least similar ultrastructure to that of the silk fibres
  produced by the activity of spinnerets and spinneret-associated silk glands.
metadata.lang: en_GB
metadata.name: dc.language.iso
metadata.value: en
metadata.lang: en_GB
metadata.name: dc.publisher
metadata.value: St Petersburg State University
metadata.lang: en_GB
metadata.name: dc.relation.ispartofseries
metadata.value: Biological Communications;Volume 64; Issue 3
metadata.lang: -
metadata.name: dc.subject
metadata.value: spiders
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: adhesive setae
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: claw tufts
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: tarsal secretions
metadata.lang: en_GB
metadata.name: dc.subject
metadata.value: tarantula silk
metadata.lang: en_GB
metadata.name: dc.title
metadata.value: Claw tuft setae of tarantulas (Araneae, Mygalomorphae, Theraphosidae) and the production of fibrous materials. Do tarantulas eject silk from their feet?
metadata.lang: en_GB
metadata.name: dc.type
metadata.value: Article
metadata.lang: en_GB
resources.filename: 169-182.pdf
resources.url: https://dspace.spbu.ru/bitstream/11701/16622/1/169-182.pdf
resources.format: Adobe PDF
resources.size: 3,03 MB