Chaetotaxia

from Wikipedia, the free encyclopedia
Chaetotaxy of the head of a fly : 8: bristles of the cheek; 9: outer crown bristle; 10: orbital bristle; 11: inner crown bristle; 13: ocelle bristles; 17: Arista, feeler bristle; 18: vibrissae

The Chaetotaxie or Chaetotaxis is the specific arrangement of bristles and hair in the arthropods and annelid worms . The absence or presence of certain Chaetae (bristles) or Setae (bristle hairs) is used for the systematic classification of a group or the identification of species. Especially with mites , springtails , but also with the caterpillars of the butterflies or with the bristling of the antennae and pairs of legs of many crustaceans , chaetotaxy is used to depict phylogenetic relationships on the basis of morphological characteristics.

History of the term Chaetotaxie

The Chaetotaxie was first introduced by Carl Robert Osten-Sacken for two-winged people after Ernst August Girschner had created the basis for a comparative study with precise drawings and terminology. Osten-Sacken paid tribute to Girschner's services to chaetotaxia in his autobiography. Osten-Sacken chose the term chaetotaxia based on the theory of leaf position (phyllotaxia or phyllotaxis ), which since the 1830s has been about the description of the laws governing the arrangement of the leaves on the stem of the plants.

Bristle formula

Bristle formulas have been created to describe the number of bristles or thorns on the various limbs of the extremities of numerous arthropods. For example, the formula 3.4.4.3 applies to the end links of the outer branches of the swimming legs of most species of the copepod genus Metacyclops .

Individual evidence

  1. Louis Deharveng: Recent advances in Collembola systematics. Pedobiologia, 48, 415-433, 2004
  2. AM Gerasimov: The Chaetotaxie of the anal segment of the caterpillars. Journal of the Austrian Entomological Association, 24, pp. 36–39, 1939 ( PDF )
  3. ^ A b Carl Robert Osten-Sacken: An essay of comparative Chaetotaxy, or the arrangement of characteristic bristles of Diptera. Mittheilungen des Münchener Entomologische Verein, 5, pp. 121-138, 1881 digitized
  4. Carl Robert Osten-Sacken: A few more words about chaetotaxia, that is the distribution of the macrochaetes among the Diptera . Wiener Entomologische Zeitung, 1, 91–92, 1882 ( digitized version )
  5. Ernst August Girschner: A new muscid system based on the thoracic bristles and the segmentation of the abdomen. Illustrated weekly for entomology, 1, 1896
  6. ^ Carl Robert Osten-Sacken: Record of my life and work in entomology. Cambridge (Mass.) 1903, p. 156

literature

  • JF McAlpine: Morphology and terminology - Adults. In: JF McAlpine et al. (Ed.): Manual of Nearctic Diptera. Volume 1, pp. 9-63, Research Branch, Agriculture Canada, Monograph 27, Ottawa 1981

Web links