''Boucardicus monchenkoi'' is a

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

land snail A land snail is any of the numerous species of snail that live on land, as opposed to the sea snails and freshwater snails. ''Land snail'' is the common name for terrestrial molluscs, terrestrial gastropod mollusks that have gastropod shell, shel ...

with an operculum, a

terrestrial Terrestrial refers to things related to land or the planet Earth, as opposed to extraterrestrial. Terrestrial may also refer to: * Terrestrial animal, an animal that lives on land opposed to living in water, or sometimes an animal that lives on o ...

gastropod Gastropods (), commonly known as slugs and snails, belong to a large Taxonomy (biology), taxonomic class of invertebrates within the phylum Mollusca called Gastropoda (). This class comprises snails and slugs from saltwater, freshwater, and fro ...

mollusc Mollusca is a phylum of protostome, protostomic invertebrate animals, whose members are known as molluscs or mollusks (). Around 76,000 extant taxon, extant species of molluscs are recognized, making it the second-largest animal phylum ...

in the family

Alycaeidae Alycaeidae is a taxonomic family of small to large tropical land snails with an operculum, terrestrial gastropod mollusk Mollusca is a phylum of protostomic invertebrate animals, whose members are known as molluscs or mollusks (). ...

. This species is

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

Madagascar Madagascar, officially the Republic of Madagascar, is an island country that includes the island of Madagascar and numerous smaller peripheral islands. Lying off the southeastern coast of Africa, it is the world's List of islands by area, f ...

, and occurs near

Tôlanaro Fort-Dauphin (Malagasy Tolagnaro or Taolagnaro) is a city (''commune urbaine'') on the southeast coast of Madagascar. It is the capital of the Anosy Region and of the Taolagnaro District. It has been a port of local importance since the early 150 ...

Etymology

The specific name, ''monchenkoi'', honors the collector of the first known specimen,

Professor Professor (commonly abbreviated as Prof.) is an Academy, academic rank at university, universities and other tertiary education, post-secondary education and research institutions in most countries. Literally, ''professor'' derives from Latin ...

Vladislav Monchenko,

Academician An academician is a full member of an artistic, literary, engineering, or scientific academy. In many countries, it is an honorific title used to denote a full member of an academy that has a strong influence on national scientific life. Accor ...

National Academy of Sciences of Ukraine The National Academy of Sciences of Ukraine (NASU; , ; ''NAN Ukrainy'') is a self-governing state-funded organization in Ukraine that is the main center of development of Science and technology in Ukraine, science and technology by coordinatin ...

, founder of the Department of Invertebrate Fauna and Systematics of I.I. Schmalhausen Institute of Zoology.

Shell description

The

shell Shell may refer to: Architecture and design * Shell (structure), a thin structure ** Concrete shell, a thin shell of concrete, usually with no interior columns or exterior buttresses Science Biology * Seashell, a hard outer layer of a marine ani ...

of ''B. monchenkoi'' is pupilloid-like and clearly

ribbed ''Ribbed'' is the third studio album by the American punk rock band NOFX, released in 1991 through Epitaph Records. It was their last album to feature Steve Kidwiler on guitar; he was replaced by El Hefe. ''Ribbed'' is also the last NOFX album ...

, reaching 2.6–2.9 mm in height, and 1.3–1.5 mm in diameter. The

aperture In optics, the aperture of an optical system (including a system consisting of a single lens) is the hole or opening that primarily limits light propagated through the system. More specifically, the entrance pupil as the front side image o ...

is ovate-triangular with a single well developed columellar lamella that goes from the beginning of the

body whorl The body whorl is part of the morphology (biology), morphology of the gastropod shell, shell in those gastropod mollusks that possess a coiled shell. The term is also sometimes used in a similar way to describe the shell of a cephalopod mollusk ...

until the edge of the aperture, where it is clearly visible. The shell's peristome is complete and not reflected.

References

Boucardicus Molluscs of Madagascar Gastropods described in 2015 Endemic fauna of Madagascar {{Cyclophoridae-stub