| Megadenus | |
|---|---|
Scientific classification  | |
| Kingdom: | Animalia |
| Phylum: | Mollusca |
| Class: | Gastropoda |
| Subclass: | Caenogastropoda |
| Order: | Littorinimorpha |
| Family: | Eulimidae |
| Genus: | Megadenus Rosén, 1910 |
| Type species | |
| Megadenus holothuricolaRosen, 1910 | |
Megadenus is a genus of sea snails, marine gastropod mollusks in the family Eulimidae. [1]
Species within this genus include the following: [1]
[2] This parasite was discovered to reside in the cloacal chamber of the black sea cucumber Holothuria atra. M. atrae differs from the other species by having moderately long and thick developed collar of the proboscis that contains a constricted apical pseudopallium. Its pseudopallium can be distinguished by its cauldron-like structure. In addition to a rounded basal lip of the shell aperture. M. atrae is found in black sea cucumbers of which are in India, Japan, Australia and New Caledonia.
M.atrae exhibit sexual dimorphism. Female species of M. atrae are slightly bigger than male species as they have a slightly larger shell. Males are able to switch sexes in the absence of a female. The parasite is suggested to have less tolerance to low water temperatures than its host species. Furthermore, this limits its ability to mate and confines it to specific water temperatures of which its host must be in alongside the opposite sex.
Eulimidae is a family of very small parasitic sea snails, marine gastropod mollusks in the superfamily Vanikoroidea.
Vanikoroidea is a superfamily of sea snails, marine gastropod molluscs in the clade Littorinimorpha. The superfamily Eulimoidea is a synonym of Vanikoroidea.
Thyca is a genus of small sea snails, marine gastropod mollusks in the family Eulimidae. These snails are ectoparasites of starfish; they are relatively unmodified, the underside having become a suction disc with a central mouth that draws nourishment from the host's tissues.
Entovalva nhatrangensis is a species of small marine bivalve mollusc in the family Lasaeidae. It was first described in 2010 and its specific name "nhatrangensis" derives from the locality where it was originally found, Nha Trang Bay in Vietnam. It lives inside the oesophagus of certain species of sea cucumbers. It is considered to be an endosymbiont rather than a parasite because it does not harm its host.
Apicalia is a genus of medium-sized sea snails, marine gastropod mollusks in the family Eulimidae.
Apicalia palmipedis is a species of sea snail, a marine gastropod mollusk in the family Eulimidae.
Echineulima is a genus of sea snails, marine gastropod mollusks in the family Eulimidae.
Eulitoma is a genus of sea snails, marine gastropod mollusks in the family Eulimidae.
Thyca stellasteris is a species of sea snail, a marine gastropod mollusk in the family Eulimidae. The species is one of a number within the genus Thyca.
Fusceulima is a genus of sea snails, marine gastropod mollusks in the family Eulimidae.
Gasterosiphon deimatis is a species of sea snail, a marine gastropod mollusk in the family Eulimidae. This is the only species known to exist within the genus, Gasterosiphon.
Halielloides is a genus of sea snails, marine gastropod mollusks in the family Eulimidae.
Mucronalia is a genus of very small parasitic sea snails, marine gastropod mollusks or micromollusks in the family Eulimidae.
Pelseneeria is a genus of very small ectoparasitic sea snails, marine gastropod mollusks or micromollusks in the family Eulimidae. This genus was first described by R. Koehler and C. Vaney in 1908.
Sabinella is a genus of very small ectoparasitic sea snails, marine gastropod mollusks or micromollusks in the Eulimidae family. This genus was first described by Monterosato in 1890.
Monogamus is a genus of small sea snails, marine gastropod mollusks in the family Eulimidae.
Paramegadenus is a genus of parasitic sea snails, marine gastropod mollusks in the family Eulimidae.
Parvioris is a genus of small ectoparasitic sea snails, marine gastropod mollusks in the family Eulimidae.
Thyonicola dogieli is a parasitic species of gastropod mollusc in the family Eulimidae. It parasitises sea cucumbers in the northeastern Pacific Ocean.
Holothuria arguinensis is a species of sea cucumber in the family Holothuriidae and subgenus Roweothuria. It is found in waters off the northeast Atlantic Ocean and Mediterranean Sea. According to some scholarly research, the species is actively expanding its range and colonizing the south-eastern coast of Spain.
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