Tears

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The tear saber (from the English lachrymal saber ) is a bone structure that was discovered in the skull of various fish species from the subordination of the dragon's head relatives .

function

The tear saber is a protruding bone in the skull area below the eye, which mostly rests on the head. However, in case of danger, the fish can spread this bone so that it protrudes like a blade. By doing this, they warn their enemies or defend themselves. In addition, some species produce a neurotoxin that is better able to get into the enemy's organism through wounds caused by tear sabers. The application and spreading of the tear saber is controlled by movements of the upper jaw.

The tear saber has only been found in dragon head relatives. The species that have this agile bone structure include Aetapcus maculatus , various stonefish and frontal finfish .

discovery

The teardrop saber was first described in 2018 by W. Leo Smith , Elizabeth Everman and Clara Richardson at the University of Kansas . Based on these discoveries, among other things, it was proposed to rearrange the systematics of the scorpionfish relatives and the wasp fish (Apistidae), the velvet fish (Aploactinidae), the Eschmeyeridae , the Gnathanacanthidae , the Indian fish (Pataecidae) and the Perryenidae as subfamilies of an extended family Synanceiidae (so far only stone fish). The family of the forehead fins (Tetrarogidae) is dissolved because their monophyly could not be proven, and the genera of the forehead fins are placed directly, without assignment to a subfamily, in the family Synanceiidae.

Web links

literature

  • W. Leo Smith, Elizabeth Everman, and Clara Richardson (2018) Phylogeny and Taxonomy of Flatheads, Scorpionfishes, Sea Robins, and Stonefishes (Percomorpha: Scorpaeniformes) and the Evolution of the Lachrymal Saber. Copeia : March 2018, Vol. 106, No. 1, pp. 94-119. doi: 10.1643 / CG-17-669

Individual evidence

  1. ↑ https://www.nationalgeographic.de/tiere/2018/05/fische-mit-eingebautem-springmesser-und-andere-versteckte-tierwaffen Accessed on April 29, 2020
  2. ^ A b c W. Leo Smith, Elizabeth Everman, and Clara Richardson (2018): Phylogeny and Taxonomy of Flatheads, Scorpionfishes, Sea Robins, and Stonefishes (Percomorpha: Scorpaeniformes) and the Evolution of the Lachrymal Saber. Copeia : March 2018, Vol. 106, No. 1, pp. 94-119. doi: 10.1643 / CG-17-669