Jordan’s organ
The Jordan organ , scientifically chaetosema of χαιτη (chaite) "hair" and σημα (sema) "feature, sign", is a pair of wart-like or (in rams of the genus Zygaena ) transversely bulbous elevations on the vertex behind the antennae of many butterflies that are provided with tufts of hair arranged radially and represent a sensory organ of unknown function. It is believed to be used to measure airflow during flight. The sensory cells are connected to a collection of bipolar ganglion cells, a pair of which pulls nerves into the protocerebrum of the pharyngeal ganglion . The Chaetosema was first interpreted as a sense organ by Karl Jordan in 1923 and was later named after him.
Individual evidence
- ^ Stefan von Kéler : Entomological dictionary . Akademie-Verlag, Berlin 1963.
- ^ Lajos Zombori, Henrik Steinmann: Dictionary of Insect Morphology. In: Handbook of Zoology. Volume 4, Arthropoda: Insecta, Teilband 34, de Gruyter 1999, ISBN 3-11-014898-6 , p. 93
- ↑ a b Holger H. Dathe (Hrsgb.): Textbook of special zoology. Volume I: Invertebrates. Part 5: Insecta. Spektrum, Berlin 2003. ISBN 3-8274-0930-6 , p. 684
- ^ Karl Jordan (1923): On a sensory organ found on the head of many Lepidoptera. Novitates Zoologicae 30: pages 155-158, plate II. ISSN 0950-7655