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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.
The Pacific hagfish (Eptatretus stoutii) is a species of hagfish. It lives in the mesopelagic to abyssal Pacific Ocean , near the ocean floor . It is a jawless fish and has a body plan that resembles early Paleozoic fishes.
Eptatretus deani, the black hagfish, is a species of hagfish. Common to other species of hagfish, their unusual feeding habits and slime -producing capabilities have led members of the scientific and popular media to dub the hagfish as the most "disgusting" of all sea creatures.
1920s illustration of the body and mouth by Louis Thomas Griffin. The broadgilled hagfish or New Zealand hagfish (Eptatretus cirrhatus), also known by its Māori language name tuere, is a hagfish found around New Zealand and the Chatham Islands as well as around the south and east coasts of Australia, at depths between 1 and 900 metres.
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 .
The inshore hagfish (Eptatretus burgeri) is a hagfish found in the Northwest Pacific, from the Sea of Japan and across eastern Japan to Taiwan. It has six pairs of gill pouches and gill apertures. [4] These hagfish are found in the sublittoral zone. They live usually buried in the bottom mud and migrate into deeper water to spawn.
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.