A New Whalefish Species of the Genus Cetomimus (Cetomimidae) from the Tropical Part of the Central Atlantic

A new species of bathypelagic whalefishes of the genus Cetomimus is described; its two specimens were caught over the central tropical part of the Mid-Atlantic Ridge at the layers of 1500–0 and 2680–0 m. The species is characterized by the presence of 31/2 gill arches (with a small slit behind the t...

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Bibliographic Details
Published in:Journal of ichthyology 2023-06, Vol.63 (3), p.395-407
Main Authors: Kobyliansky, S. G., Gordeeva, N. V., Mishin, A. V.
Format: Article
Language:English
Subjects:
Anus
Biomedical and Life Sciences
Canals (anatomy)
Cetomimus
Divergence
DNA barcoding
Fins
Gills
Lateral line
Life Sciences
Mid-ocean ridges
Mitochondrial DNA
New species
Nucleotide sequence
Physical characteristics
Pores
Sharks
Vertebrae
Zoology
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Description
Summary:A new species of bathypelagic whalefishes of the genus Cetomimus is described; its two specimens were caught over the central tropical part of the Mid-Atlantic Ridge at the layers of 1500–0 and 2680–0 m. The species is characterized by the presence of 31/2 gill arches (with a small slit behind the third gill arch) and cavernous tissue developed only around the anus and above the bases of the first to sixth rays of the anal fin; large pores in the lateral line canal, which are approximately as wide as this canal; the absence of large, valve-shaped triangular outgrowths along the margin of septa between pores in the posterior part of the lateral line; 42–48 vertebrae; and 20, 17–18, and 18 rays in the pectoral, dorsal, and anal fins, respectively; 17–18 pores in the lateral line canal between the upper margin of the gill cover and the end of the caudal peduncle, as well as by some other diagnostic features. The first molecular genetic data for the described species (mtDNA COX-1 sequences, or DNA barcodes) and analysis of interspecific divergence in the genus Cetomimus are given.
ISSN:0032-9452
1555-6425
DOI:10.1134/S0032945223030074