Sundadanio
| Sundadanio | ||||||||||||
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Sundadanio cf. axelrodi |
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| Scientific name | ||||||||||||
| Sundadanio | ||||||||||||
| Kottelat & Witte , 1999 |
Sundadanio is a genus of very small freshwater fish from the order of the carp-like and consists of eight species. The genus occurs in tropical Southeast Asia on Sumatra , Bangka , Bintan and Singkep and inhabits peaty swamps and blackwater rivers .
features
The Sundadanio species are 1.6 to 2.3 cm long. The males have a light blue, emerald green, orange or red longitudinal band on the sides of the body, the width of which varies from species to species. The belly is wine-red to orange, with a black spot on the front half of the anal fin. Females are transparent and show small melanophores scattered over a large part of the body surface . In addition to the coloration, sexual dimorphism is also evident in the axial skeleton and the pelvic girdle . The male cleithrum , a pair of cover bones in the shoulder girdle, has a large membranous flange at the rear end. The males' shoulder girdle cartilage is completely ossified. The head of the fifth vertebra and the outer arm of one of the bones of Weber's apparatus (os suspensorium) are enlarged in males and up to 10 times thicker than in females. The males' fifth pectoral fin ray is greatly thickened and has a small, pointed, sometimes fluted crest on its dorsal surface. Males show conical tubercles on almost the entire surface of the trunk, the upper and lower sides of the head and on the upper and lower jaws.
Sundadanio's scales are thin and cycloid . They are absent on a dorsal midline in front of the dorsal fin and above the base of the anal fin, in S. axelrodi also on the caudal peduncle. The remaining species have 32 to 34 scales in a central longitudinal row and 12 around the caudal peduncle. The pharynx teeth are arranged in two rows, with one or two teeth in the outer row and five in the inner row.
- Fin formula : dorsal ii-iii / 6 / i; Anal iii / 6-7; Caudals 10 + 9 (9–12 dorsal and 8–11 ventral tributaries), pectorals 9; Ventral 6–7.
- Vertebrae: 34-36 (14-15 abdominal vertebrae and 19-21 caudal vertebrae).
- Hypuralia : 5-6.
Systematics
The genus Sundadanio was introduced in 1999 by the Swiss ichthyologist Maurice Kottelat and his German colleague Kai-Erik Witte . The database Fishbase the species is the Bärblingen assigned (Danioninae) in the Catalog of Fishes, which is updated monthly, they belong together with the equally diminutive species Fangfangia family Sundadanionidae after sundadanio was named.
species
To date, eight species have been described:
- Sundadanio atomus Conway, Kottelat & Tan, 2011
- Sundadanio axelrodi (Brittan, 1976)
- Sundadanio echinus Conway, Kottelat & Tan, 2011
- Sundadanio gargula Conway, Kottelat & Tan, 2011
- Sundadanio goblinus Conway, Kottelat & Tan, 2011
- Sundadanio margarition Conway, Kottelat & Tan, 2011
- Sundadanio retiarius Conway, Kottelat & Tan, 2011
- Sundadanio rubellus Conway, Kottelat & Tan, 2011
literature
- Kevin W. Conway, Maurice Kottelat & Tan Heok Hui: Review of the Southeast Asian miniature cyprinid genus Sundadanio (Ostariophysi: Cyprinidae) with descriptions of seven new species from Indonesia and Malaysia. Ichthyol. Explor. Freshwaters, Volume 22, No. 3, September 2011 © by Verlag Dr. Friedrich Pfeil, Munich, Germany - ISSN 0936-9902
Individual evidence
- ↑ a b Sundadanio on Fishbase.org (English)
- ↑ Sundadanio in the Catalog of Fishes (English)