Eye-spot harlequin
| Eye-spot harlequin | ||||||||||||
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Eye spot harlequin ( Brevibora dorsiocellata ) |
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| Brevibora dorsiocellata | ||||||||||||
| ( Duncker , 1904) |
The Eyespot Rasbora ( Brevibora dorsiocellata ; formerly Rasbora dorsiocellata ) is a small freshwater fish , which on the Malay Peninsula and Sumatra occurs. Two subspecies have been described, the nominate form B. d. dorsiocellata and B. d. macrophthalma Meinken 1951, called Leuchtaugen-Rasbora in German .
features
The osprey has an elongated, laterally flattened body that reaches a maximum length of 6.5 cm, the subspecies B. d. macrophthalma is only 3.5 cm long. The body is from yellowish-silvery to delicate olive basic color and shimmers slightly grass-green or bluish to purple. The back is gray-brown or brown-olive, the belly silvery, the fins yellowish. The dorsal fin shows a characteristic black spot with a white border. Two dark, more or less distinct longitudinal bands extend along the sides of the body. The sideline is all or almost all of it.
- Fin formula : dorsal 2/7, anal 3/5, pectoral 1/12, ventral 2/8.
- Scale formula : SL 20–27.
In the subspecies B. d. macrophthalma , the eye is larger, the head shorter and the number of scales in the central longitudinal row less than in the nominate form. The lower half of the eye is iridescent gray-green. The longitudinal ties are barely visible.
Way of life
Ospreys live as schooling fish in flowing and standing waters. They stay close to the surface or in central water zones. They feed on insects that have fallen on the surface of the water, zooplankton, crustaceans and worms.
Systematics
The species was assigned by Duncker in the first description of the collective genus Rasbora . In 2009 Liao, Kullander & Fang established the genus Brevibora for the species . According to Tang et al. (2010) the species is located deep within Rasbora sensu lato .
literature
- Hans A. Baensch , Rüdiger Riehl : Aquariums Atlas, Volume 1 . Mergus Verlag, 1997, ISBN 3-88244-101-1 .
- Günther Sterba (Ed.), Gert Brückner: Encyclopedia of Aquaristics and Special Ichthyology. Neumann-Neudamm, Melsungen u. a. 1978, ISBN 3-7888-0252-9 .
- Günther Sterba: The world's freshwater fish. 2nd Edition. Urania, Leipzig / Jena / Berlin 1990, ISBN 3-332-00109-4 .
- Axel Zarske: Rasbora dosriocellata. In: Claus Schaefer, Torsten Schröer (Hrsg.): The large lexicon of aquaristics. Eugen Ulmer, Stuttgart 2004, ISBN 3-8001-7497-9 , p. 848.
Individual evidence
- ↑ Liao, TY, SO Kullander & F. Fang (2009): Phylogenetic analysis of the genus Rasbora (Teleostei: Cyprinidae). - Zoologica Scripta doi : 10.1111 / j.1463-6409.2009.00409.x
- ↑ Tang, KL et al. (2010): Systematics of the subfamily Danioninae (Teleostei: Cypriniformes: Cyprinidae). Molecular Phylogenetics and Evolution 57: 189-214.
Web links
- Osprey on Fishbase.org (English)