Semi-slugs, also spelled semislugs, are land gastropods whose shells are too small for them to retract into, but not quite vestigial. [1] The shell of some semi-slugs may not be easily visible on casual inspection, because the shell may be covered over with the mantle .

But life isn’t simple, so of course there’s secret option #3 – the semi-slug, a bizarre creature that sits exactly between the snail and the slug. The semi-slug belongs to the family Helicarionidae, and is found all over the world, including the coastal regions of Australia.

Oct 29, 2021 · According to the evolutionary story, semi-slugs are a transitional state between snails and slugs. This argument, however, raises significant problems beyond the morphology problem posed by the number of genetic changes required to morph from a snail to a slug.

Apr 27, 2023 · A group of researchers and citizen-scientists have identified a new semi-slug species, Microparmarion sallehi, from the lowland rainforests of northern Borneo Island.

Aug 23, 2013 · Semi-slugs are snails who have a shell that's too small for them to retract into. They're dotted around the gastropod family tree, so there are several branches where a bunch of slugs, snails and semi-slugs are more closely related to each other than to …

Nov 3, 2022 · We can see this process happening in species known as semi-slugs. In semi-slugs, the shell is still present, but is no longer big enough for the snail to retreat into. For many slugs, however, some remnant shell is still present, hidden beneath their skin, but not visible.

Gaeotis flavolineata, the Puerto Rican Semi-slug, is an arboreal mollusk endemic to Puerto Rico. We found it in the El Yunque Natonial Forest.

Since shell reduction occurs gradually over the course of many generations, there are many species that have body forms intermediate between snails and slugs. These are referred to as semi-slugs. A semi-slug still has an external shell, but cannot fully retract into it.

The animal is generally called a semi-slug Semi-slug: A snail that possess a very reduced (no definite coiling) or small shell, that is often located on the posterior edge of the mantle. The animal is not able to retract into this minute shell.

Daudebardia brevipes is a species of air-breathing land snail or semi-slug, a terrestrial pulmonate gastropod mollusk in the family Oxychilidae which belongs to the "Limacoid clade".