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Cytotaxonomy of Californian myctophoid fishes
Chen, T.R.; Ebeling, A.W. (1974). Cytotaxonomy of Californian myctophoid fishes. Copeia 1974(4): 839-848
In: Copeia. American Society of Ichthyologists and Herpetologists: New York, N.Y., etc.. ISSN 0045-8511; e-ISSN 1938-5110
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  • Chen, T.R.
  • Ebeling, A.W.
Abstract
    Thirteen Californian species representing three marine families of myctophoid myctophiform fishes were compared cytotaxonomically. Having specialized spindle-shaped sperm and a relatively high DNA content, the 11 mesopelagic and bathypelagic species of lanternfishes (Myctophidae) examined are easily distinguishable from their relatively close bathypelagic relative Scopelengys tristis (Neoscopelidae) and from a more distant shallow-benthic relative Synodus lucioceps (Synodontidae). Karyotypes of most myctophoid fishes equal or approximate the "basic" teleostean complement of 2n = 48 uniarmed chromosomes. Synodus, however, has mostly biarmed chromosomes, perhaps derived by pericentric inversions and translocations from uniarmed elements. Lanternfish nuclei vary among five cytologically-defined groups of species in chromosome number and form, and in the expression of heterochromatic meiotic bodies, some of which may represent the sex elements. These variations generally follow the main taxonomic subdivisions of the family, but not necessarily the secondary ones. Two of three bathypelagic lanternfishes have "atypical" karyotypes in that they have chromosome numbers other than 2n = 48 and up to 4 especially long (L) chromosomes. All mesopelagic species examined have only the shorter "fundamental" (F) chromosomes. Possible derivations of "atypical" karyotypes are discussed in light of their taxonomic significance
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