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  • 1
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary We have studied the chromosomes of 11 of the 15 known species of the notothenioid family Channichthyidae, the specialized whiteblooded Teleosts endemic to the Southern Ocean (ice-fishes). In the female sex, all studied species have the same diploid number of forty eight mostly acrocentric (uniarmed) chromosomes; however there is an interspecific variability in the chromosome morphology, type and quantity of repetitious DNA (usually seen as heterochromatin) localization of silver-stained nucleolar organizers. At least five of the studied species show a multiple sex-chromosome system possibly originated by the translocation of an autosome on an early Y gonosome morphologically similar to the X: the digametic males (2n = 47) show a X1Y X2 and the homogametic females (2n = 48) a X1X1X2X2 gonosomic constitution. This peculiar sex determining mechanism, otherwise rare in Teleosts, can be considered apomorphic in the same way as other morphofunctional characters usually interpreted as adaptive in these fishes.
    Type of Medium: Electronic Resource
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  • 2
    ISSN: 1432-2056
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The notothenioids are an Antarctic suborder of perciform fishes to which increasing interest is being devoted. To investigate their origin, one must address two questions. First, are Bovichtidae (Bovichtus, Cottoperca, Pseudaphritis), the sister-group of the rest of the suborder, monophyletic ? Secondly, what is the sister-group of the Notothenioidei ? These questions were addressed by determining the complete nucleotide sequence of the D2 and D8 domains of 28S rDNA (759 sites, among which 158 informative for parsimony), for 6 notothenioids and a collection of 6 outgroup taxa including the Trachinoidei and Zoarcoidei. Different outgroups (or combinations of outgroups) and different weighting schemes support the inference that Pseudaphritis is closer to the rest of the Notothenioidei than Cottoperca and Bovichtus are. Relationships of Cottoperca and Bovichtus remain unclear with respect to outgroups. Our molecular data therefore clearly show that the Bovichtidae are paraphyletic, but their relationships are not those suggested by Balushkin in 1992. Our data provide no indication of the monophyly of the Notothenioidei in its classical sense. Most of the homoplasy is due to outgroup sequences and interrelationships of outgroups are unresolved. Some morphological synapomorphies shared by Pseudaphritis and the rest of the non-bovichtid Notothenioidei are proposed, including some that were identified by Voskoboynikova in 1993.
    Type of Medium: Electronic Resource
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  • 3
  • 4
    Publication Date: 1995-12-01
    Description: A cytogenetic study on the bovichtid species Cottoperca gobio from the Magellan Strait and Pseudaphritis urvillii from Tasmania showed both species have a plesiomorphic number of chromosomes (2n=48). However, C.gobio has a more conservative karyotype composed entirely of acrocentric chromosomes (Fundamental Number=48); the presence of two metacentric pairs in P. urvilli (FN=52) makes this species karyologically more derived. The differences in the number of chromosomal arms, and the chromosomal location of the nucleolar organizer regions indicate karyological divergence in the two separating stocks from which C.gobio and P.urvillii originated. During the diversification of this notothenioid family, probably coincident with the fragmentation of Gondwana, the stock that split off with the Australian Plate gave rise to the Tasmanian species and experienced more chromosomal modifications than the stock from which C. gobio is derived. The pattern of constitutive heterochromatin suggests a possible homology between a pair of chromosomes in bovichtids and other notothenioids.
    Print ISSN: 0954-1020
    Electronic ISSN: 1365-2079
    Topics: Biology , Geography , Geosciences
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  • 5
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    FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS
    In:  FOOD AND AGRICULTURE ORGANIZATION OF THE UNITED NATIONS, Rome, 233 pp. ISBN 9251023573
    Publication Date: 2019-03-05
    Description: This publication presents the marine living resources of the Southern Ocean considered to be of interest to fisheries or of major importance for the conservation of the Antarctic environment, in the form of a practical, illustrated field guide following the format of the by non well-established series of FAO Species Identification Sheets for Fishery Purposes. The major groups included are seaweeds, euphausiids, king crabs/stone crabs, bivalves, gastropods, cephalopods, hagfishes/lampreys, sharks, batoid fishes, bony fishes and marine mammals. Every group section includes an explanation of relevant technical terminology, general remarks, guides or keys to suborders, families or genera, and identification sheets for selected families and species. Identification sheets include an alpha-numerical family or species code, valid scientific names and synonyms still in use, proposed CCAMLR/FAO common names in English, French, Russian and Spanish, an illustration of the family or species in question, a diagnosis, illustrated differential diagnoses of similar families or species, and information on size, geographical distribution and behaviour (with a map), and fisheries. The publication ends with a comprehensive alphabetical index of scientific and common names.
    Type: Book , NonPeerReviewed
    Format: text
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