Leptobrama pectoralis
| Leptobrama pectoralis | ||||||||||||
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| Scientific name | ||||||||||||
| Leptobrama pectoralis | ||||||||||||
| ( Ramsay & Ogilby , 1887) |
Leptobrama pectoralis is a species of fish known from the Arafura Sea in northernAustraliaand from rivers in southern New Guinea . Besides the Australian beach salmon ( Leptobrama muelleri ), it is the second known species in the Leptobramidae family.
features
Leptobrama pectoralis is loud-mouthed, elongated and strongly flattened on the sides. It is monochrome, shiny and silvery and, in contrast to the beach salmon, has no black spot on the distal end of the dorsal fin. Further differences between the sister species concern the morphometry . The head of Leptobrama pectoralis is longer (22.2 to 25.8% of the SL vs. 21.7 to 22.7%), the snout, and in fish the area between the tip of the mouth and the front edge of the eyes, but shorter (16, 9 to 22.6% of the head length vs. 19.9 to 24.5%). The upper jaw is longer with leptobrama pectoralis (61.8 to 66.1% of the head length vs. 53.0 to 61.3%). In Leptobrama pectoralis the palatal teeth on the vomer stand on a rhombus-shaped field, in L. muelleri the dentate area is round. In L. pectoralis , the tips of the pectoral fins extend slightly beyond the tips of the attached pelvic fins. In L. muelleri , the pectoral fins are somewhat shorter and only reach to the tips of the attached pelvic fins. On the fore body, the lateral line in L. pectoralis slopes downwards in a step-like manner, in L. muelleri the line runs gradually and curved downwards. Below the lateral line, L. pectoralis has 15 to 18 rows of scales, in L. muelleri there are 13 to 14. The number of gill rakes in L. pectoralis is 6 to 12, L. muelleri has 13 to 18.
Systematics
The fish species was first scientifically described in 1887 by the Australian zoologists Edward Pierson Ramsay and James Douglas Ogilby under the name Neopempheris pectoralis . The type specimen came from the Aird River in southern Papua New Guinea. In 1913 Ogilby synonymous the species with Leptobrama muelleri . The genus remained monotypical for more than 100 years , until two ichthyologists encountered three fish at the Ambon fish market , which looked similar to the beach salmon but also showed clear differences. Together with a colleague, they then revalidated the fish species as Leptobrama pectoralis .
literature
- Seishi Kimura, Teguh Peristiwady & Ronald Fricke. (2016): Taxonomic review of the genus Leptobrama Steindachner 1878 (Perciformes: Leptobramidae), with the resurrection of Leptobrama pectoralis (Ramsay and Ogilby 1887). Ichthyological Research, February 9, 2016.