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  • 1
    Electronic Resource
    Electronic Resource
    Dasyatis laosensis, a new whiptailed stingray (family Dasyatidae), from the Mekong River of Laos and Thailand (1987)
    Springer
    Environmental biology of fishes 20 (1987), S. 161-167 
    Details
    ISSN: 1573-5133
    Keywords: Freshwater elasmobranchs ; Southeast Asia ; China ; West River ; Dasyatis akajei
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Dasyatis laosensis, a new species, is described from the Mekong River where it forms the border between Laos and Thailand. It is the first member of the genus Dasyatis to be described as an endemic freshwater species from Southeast Asia. Bright orange color on the ventral surface of the disc and similar meristic characters indicate that it may be closely related to Dasyatis akajei, a marine species from southern Japan and China, and to Dasyatis sp. undetermined, from the West River in Guangxi, southern China.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00004951
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Chromosome study of hybrid and gynogenetic offspring of artificial crosses between members of the catfish families Clariidae and Pangasiidae (1993)
    Springer
    Environmental biology of fishes 37 (1993), S. 317-322 
    Details
    ISSN: 1573-5133
    Keywords: Interfamilial hybridization ; Hybrid morphotypes ; Triploid ; Clarias macrocephalus ; Pangasius sutchi ; Fishes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Artificial hybridization between species of the catfish families Clariidae (Clarias macrocephalus) and Pangasiidae (Pangasius sutchi) resulted in first generation offspring comprising two intermediate morphotypes and one morphotype indistinguishable from its clariid parent. The two intermediate morphotypes apparently correspond to hybrid morphotypes 2 and 4 resulting from earlier hybridization experiments between the same parent species (Tarnchalanukit 1986). We did not obtain morphotypes 1 and 3. Chromosome spreads of the relatively pangasiid-like morphotype 2 reveal a diploid number of 57, presumably comprising one set of Clarias (n=27) and one of Pangasius (n=30) chromosomes. The relatively clariid-like morphotype 4 is a triploid with 84 chromosomes, presumably comprising two sets from Clarias (2n=54) and one from Pangasius (n=30). Finally, the morphotype indistinguishable from Clarias, is a diploid with 54 chromosomes, apparently arising from gynogenesis.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00004639
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Freshwater stingrays (Dasyatidae) of Southeast Asia and New Guinea, with description of a new species ofHimantura and reports of unidentified species (1982)
    Springer
    Environmental biology of fishes 7 (1982), S. 321-339 
    Details
    ISSN: 1573-5133
    Keywords: Himantura krempfi (Chabanaud) ; Himantura signifer new species ; Kapuas River ; Mekong River ; Fly River ; Elasmobranchs
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Three species of dasyatid stingrays in Southeast Asia are presumed to be endemic freshwater species or are known only from freshwater habitats:Himantura krempfi (Chabanaud, 1923), known mainly from specimens obtained at Pnom Penh, Kampuchea, without precise indication of habitat;Himantura signifer new species, described from specimens caught in the Kapuas basin, western Borneo, and tentatively identified as occurring also in the Indragiri River, Sumatra, Perak River, western Malay Peninsula, and Chao Phrya River, Thailand; and an unidentifiedDasyatis orHimantura from the Mekong River in Laos. In addition to these, an unidentifiedHimantura is reported from the Fly River basin; this is the first record of a stingray from fresh water in New Guinea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00005567
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Danionella translucida, a new genus and species of cyprinid fish from Burma, one of the smallest living vertebrates (1986)
    Springer
    Environmental biology of fishes 16 (1986), S. 231-241 
    Details
    ISSN: 1573-5133
    Keywords: Danioins ; Transparency ; Eggs ; Skeletal anatomy ; Alcian blue-alizarin red preparations ; Danioin notch ; Maxillo-mandibulary cartilage ; Weberian apparatus ; Cyprinid vertebral formulae
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Synopsis Danionella translucida, a new genus and species of danioin cyprinid fishes, is described from Burma. Females are mature at 10–11 mm standard length, and the largest known specimen is only 12 mm. Ripe eggs are few in number and relatively large, 0.4–0.6 mm in diameter. Adults are scaleless and largely transparent, with a complex pattern of large melanophores on the ventral surface of the abdomen. Specializations observed in skeletal preparations include the ‘danioin notch’ in the medial surface of the mandibles; a large maxillo-mandibulary cartilage; a cartilage (epibranchial 5?) uniting the branchial arches 4 and 5; pharyngeal bones with a single row of 4 tricuspid teeth; and pectoral, pelvic, and caudal fins with fewer rays than reported or observed in any other members of the family Cyprinidae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00842977
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    Paper (German National Licenses)
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