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Hagfish embryos have characteristics of gnathostomes and may be plesiomorphic; [33] however, these characteristics drastically change morphologically as the hagfish matures. [33] The following hagfish and lamprey phylogeny is an adaptation based on the 2019 work of Miyashita et al. [ 69 ]
A related species, the Gulf hagfish (Eptatretus springeri), occurs in the Gulf of Mexico. [7]To distinguish these two types of hagfishes, we can look at their lateral line and eyes, the Myxine glutinosa has no lateral line system and also an unpigmented, cornea-like window in the skin overlying the eye.
Eptatretus springeri, the Gulf hagfish, [3] is a bathy demersal vertebrate which lives primarily in the northeastern Gulf of Mexico. [4] It has been observed feeding at and around brine pools : areas of high salinity which resemble lakes on the ocean floor that do not mix with the surrounding water due to difference in density .
Southern hagfish (Myxine australis) mid-19th century drawing by Günther. Myxine / m ɪ k ˈ s aɪ n iː / is a genus of hagfish, from the Greek μυξῖνος (myxinos, "slimy").It is the type genus of the class Myxini.
Eptatretus polytrema Girard, 1855 (Fourteen-gill hagfish) Eptatretus profundus Barnard, 1923 (Fivegill hagfish) Eptatretus sheni C. H. Kuo, K. F. Huang & H. K. Mok, 1994; Eptatretus sinus Wisner & C. B. McMillan, 1990 (Cortez hagfish) Eptatretus springeri Bigelow & Schroeder, 1952 (Gulf hagfish) Eptatretus stoutii Lockington, 1878 (Pacific hagfish)
The position of hagfish in the phylum Chordata is not settled. Phylogenetic research in 1998 and 1999 supported the idea that the hagfish and the lampreys form a natural group, the Cyclostomata, that is a sister group of the Gnathostomata. [3] [4]
Myxine limosa, or Girard's Atlantic hagfish, is a jawless fish in the genus Myxine. [1] [2] Description. The eellike species grows up to 79 centimetres (31 in) long ...
Myxine mcmillanae, the Caribbean hagfish, is a species of hagfish. [1] It is a scaleless, eel-like fish found in Caribbean waters that feeds off material from the surface that drifts down. It is rarely seen as it lives in very deep water from 2,300-4,950 ft (700-1,500 m) and likes to burrow into the mud.