Scientific classification e
Kingdom: Animalia
Phylum: Chordata
Infraphylum: Agnatha
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)

See text

Rubicundus is a genus of hagfishes, the only 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 are considered the most basal extant lineage 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 the Rubicundinae and Tethymyxine share an elongate snout, indented barbels, and numerous slime glands.[3]

  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". 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. doi:10.1073/pnas.1814794116. ISSN 0027-8424. PMC 6369785. PMID 30670644.

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