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Rubicundus

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Rubicundus
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Myxini
Order: Myxiniformes
Family: Myxinidae
Subfamily: Rubicundinae
Fernholm et al., 2013
Genus: Rubicundus
Fernholm et al, 2013 [1]
Type species
Rubicundus rubicundus
(Kuo, Lee & Mok 2010)
Species

See text

Rubicundus is a genus of hagfishes, the only extant member of the subfamily Rubicundinae. All species in it were formerly classified in Eptatretus. R. eos, R. lakeside, and R. rubicundus are known from single specimens caught in the Tasman Sea, Galápagos, and Taiwan, respectively. They are named after the distinctive red coloration that all species share.[2]

They represent the sister lineage to all other extant lineages of hagfishes, and may represent the sister group to the Cretaceous fossil hagfish Tethymyxine, from which they potentially diverged during the Late Jurassic or Early Cretaceous. Both Rubicundus and Tethymyxine share an elongate snout, indented barbels, and numerous slime glands.[3] Phylogenetic studies indicate that the Rubicundinae lineage may have diverged from other extant hagfishes during the Permian, making them an extremely old lineage.[4]

Species

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Four recognized species are placed in this genus:[5][6]

References

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  1. ^ Fernholm, B., Norén, M., Kullander, S.O., Quattrini, A.M., Zintzen, V., Roberts, C.D., Mok, H.-K. & Kuo, C.-H. (2013): Hagfish phylogeny and taxonomy, with description of the new genus Rubicundus (Craniata, Myxinidae). Journal of Zoological Systematics and Evolutionary Research, 51 (4): 296–307.
  2. ^ "Rubicundus rubicundus". www.fishbase.se. Retrieved 2023-03-15.
  3. ^ Miyashita, Tetsuto; Coates, Michael I.; Farrar, Robert; Larson, Peter; Manning, Phillip L.; Wogelius, Roy A.; Edwards, Nicholas P.; Anné, Jennifer; Bergmann, Uwe; Palmer, A. Richard; Currie, Philip J. (2019-02-05). "Hagfish from the Cretaceous Tethys Sea and a reconciliation of the morphological–molecular conflict in early vertebrate phylogeny". Proceedings of the National Academy of Sciences. 116 (6): 2146–2151. Bibcode:2019PNAS..116.2146M. doi:10.1073/pnas.1814794116. ISSN 0027-8424. PMC 6369785. PMID 30670644.
  4. ^ Brownstein, Chase Doran; Near, Thomas (2024-06-13). "Colonization of the ocean floor by jawless vertebrates across three mass extinctions". BMC Ecology and Evolution. 24 (1): 79. doi:10.1186/s12862-024-02253-y. ISSN 2730-7182. PMC 11170801. PMID 38867201.
  5. ^ Van Der Laan, Richard; Eschmeyer, William N.; Fricke, Ronald (11 November 2014). "Family-group names of Recent fishes". Zootaxa. 3882 (1): 1–230. doi:10.11646/zootaxa.3882.1.1. PMID 25543675.
  6. ^ Froese, R.; Pauly, D. (2017). "Petromyzontidae". FishBase version (02/2017). Retrieved 18 May 2017.