Latest Articles from Zoosystematics and Evolution Latest 2 Articles from Zoosystematics and Evolution https://zse.pensoft.net/ Thu, 28 Mar 2024 13:10:39 +0200 Pensoft FeedCreator https://zse.pensoft.net/i/logo.jpg Latest Articles from Zoosystematics and Evolution https://zse.pensoft.net/ Genetic evidence for the recognition of two allopatric species of Asian bronze featherback Notopterus (Teleostei, Osteoglossomorpha, Notopteridae) https://zse.pensoft.net/article/51350/ Zoosystematics and Evolution 96(2): 449-454

DOI: 10.3897/zse.96.51350

Authors: Sébastien Lavoué, Siti Zafirah Ghazali, Jamsari Amirul Firdaus Jamaluddin, Siti Azizah Mohd Nor, Khaironizam Md. Zain

Abstract: The fish genus Notopterus Lacepède, 1800 (Notopteridae) currently includes only one species, the Asian bronze featherback Notopterus notopterus (Pallas, 1769). This common freshwater species is widely distributed in the Oriental region, from the Indus basin in the west, the Mekong basin in the east and Java Island in the south. To examine the phylogeographic structure of N. notopterus across its range, we analysed 74 publicly available cytochrome oxidase I (COI) sequences, 72 of them determined from known-origin specimens, along with four newly-determined sequences from Peninsular Malaysian specimens. We found that N. notopterus is a complex of two allopatric species that diverge from each other by 7.5% mean p-distance. The first species is endemic to South Asia (from Indus basin to Ganga-Brahmaputra system), whereas the distribution of the second species is restricted to Southeast Asia. The exact limit between the distributions of these two species is not known, but it should fall somewhere between the Ganga-Brahmaputra and Salween basins, a region already identified as a major faunal boundary in the Oriental region. The name N. notopterus is retained for the Southeast Asian species, while the name Notopterus synurus (Bloch & Schneider, 1801) should be applied to the South Asian species. A comparative morphological study is needed to reveal the degree of morphological differentiation between the two species.

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Short Communication Wed, 1 Jul 2020 16:18:03 +0300
Reproduction and development of the asian bronze featherback Notopterus notopterus (Pallas, 1769) (Osteoglossiformes, Notopteridae) in captivity https://zse.pensoft.net/article/13341/ Zoosystematics and Evolution 93(2): 299-324

DOI: 10.3897/zse.93.13341

Authors: Honesty Yanwirsal, Peter Bartsch, Frank Kirschbaum

Abstract: Experimental data demonstrate that the environmental factors decreasing conductivity, slight variation of temperature, and water level have no influence on gonad development or courtship behavior in Notopterus notopterus. Spawning occurs during day time at a temperature of 25–28 °C. Newly spawned 3.8–4 mm adhesive eggs are guarded by the male until hatching. The egg envelope has external spiraling ridges, which are centered round the micropyle. Hatching occurs within 168–204 hours depending on temperature and even with some variability at 27°C constant incubation temperature. Exogenous feeding then starts on day 17 with a total length of 16.2 mm and yolk-sac remnants still present. The larval period lasts until day 36. Dark brown stripes appear on the body as one of the characteristic pigment patterns of juvenile N. notopterus at day 70 with a total length of around 34 mm, replacing the dotted pigment pattern of larvae and early juveniles. Later again a spectacular color change to uniformly gold-bronze coloration occurs. The genital papilla can macroscopically be recognized at day 80. Sexual maturity of N. notopterus in captivity as indicated by courtship behavior is first observed in 30-month old specimens of both sexes of the F1 generation with a total length of around 275 mm in males and 230 mm in females, whereas this might occur at smaller size in the P generation and in natural environment. Generally, in N. notopterus the embryonic period lasts longer and the onset of the larval period starts much delayed as compared to a typical indirect or saltatory development. The larval period before onset of the juvenile period with its spectacular color changes, shows few discernible stages of morphological development. It is immediately a pterygiolarva with the jaws, branchial arches, most fins differentiated, a distinct pigmentation pattern and the mouth opened during the embryonic and free embryonic phases.

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Research Article Wed, 12 Jul 2017 10:18:42 +0300