The Guadeloupe big-eyed bat (''Chiroderma improvisum'') is a species of

bat Bats are mammals of the order Chiroptera.''cheir'', "hand" and πτερόν''pteron'', "wing". With their forelimbs adapted as wings, they are the only mammals capable of true and sustained flight. Bats are more agile in flight than most bi ...

in the family Phyllostomidae. It is found in

Guadeloupe Guadeloupe (; ; gcf, label=Antillean Creole, Gwadloup, ) is an archipelago and overseas department and region of France in the Caribbean. It consists of six inhabited islands—Basse-Terre, Grande-Terre, Marie-Galante, La Désirade, and the ...

and

Montserrat Montserrat ( ) is a British Overseas Territories, British Overseas Territory in the Caribbean. It is part of the Leeward Islands, the northern portion of the Lesser Antilles chain of the West Indies. Montserrat is about long and wide, with r ...

. It is threatened by

habitat loss Habitat destruction (also termed habitat loss and habitat reduction) is the process by which a natural habitat becomes incapable of supporting its native species. The organisms that previously inhabited the site are displaced or dead, thereby ...

mostly because of

Hurricane Hugo Hurricane Hugo was a powerful Cape Verde tropical cyclone that inflicted widespread damage across the northeastern Caribbean and the Southeastern United States in September 1989. Across its track, Hugo affected approximately 2 million peop ...

, which destroyed 90% of its population in 1989. The species may be locally extinct in some areas of Guadeloupe.

Taxonomy and etymology

The Guadeloupe big-eyed bat was described in 1976. The

holotype A holotype is a single physical example (or illustration) of an organism, known to have been used when the species (or lower-ranked taxon) was formally described. It is either the single such physical example (or illustration) or one of several ...

was collected in July 1974 in

Baie-Mahault Baie-Mahault is a commune in the overseas department and region of Guadeloupe, France. It is the second most populated commune of Guadeloupe, after Les Abymes. The extensive industrial zone of Jarry in Baie-Mahault is by far the most industrializ ...

commune of

Basse-Terre Island Guadeloupe (; ; gcf, label=Antillean Creole, Gwadloup, ) is an archipelago and overseas department and region of France in the Caribbean. It consists of six inhabited islands—Basse-Terre, Grande-Terre, Marie-Galante, La Désirade, and the ...

. Its

species name In taxonomy, binomial nomenclature ("two-term naming system"), also called nomenclature ("two-name naming system") or binary nomenclature, is a formal system of naming species of living things by giving each a name composed of two parts, bot ...

is of

Latin Latin (, or , ) is a classical language belonging to the Italic branch of the Indo-European languages. Latin was originally a dialect spoken in the lower Tiber area (then known as Latium) around present-day Rome, but through the power of the ...

origin and means "unforeseen" or "unexpected." Baker and Genoways chose this species name because they "did not expect to find ''

Chiroderma ''Chiroderma'' – big-eyed bats or white-lined bats – is a genus of leaf-nosed bat found in North America, Central America, and South America and the Lesser Antilles. Species The following species were recognized , and a total of seven specie ...

'' on

because the nearest known representative from the

Caribbean The Caribbean (, ) ( es, El Caribe; french: la Caraïbe; ht, Karayib; nl, De Caraïben) is a region of the Americas that consists of the Caribbean Sea, its islands (some surrounded by the Caribbean Sea and some bordering both the Caribbean Se ...

occurs on

Trinidad and Tobago Trinidad and Tobago (, ), officially the Republic of Trinidad and Tobago, is the southernmost island country in the Caribbean. Consisting of the main islands Trinidad and Tobago, and numerous much smaller islands, it is situated south of ...

, 550 kilometers to the south." Baker and Genoways, when initially describing the species, speculated that it might be closely related to the

Brazilian big-eyed bat The Brazilian big-eyed bat (''Chiroderma doriae'') is a species of phyllostomid bat from South America. The scientific name honours Italian naturalist Giacomo Doria. Description The Brazilian big-eyed bat is small, with a total length of , and ...

, and that the current two species were

relicts A relict is a surviving remnant of a natural phenomenon. Biology A relict (or relic) is an organism that at an earlier time was abundant in a large area but now occurs at only one or a few small areas. Geology and geomorphology In geology, a r ...

of a single, once-widespread species. Conversely, in the same paper, they conceded that the two species may be similar to each other only through

convergent evolution Convergent evolution is the independent evolution of similar features in species of different periods or epochs in time. Convergent evolution creates analogous structures that have similar form or function but were not present in the last com ...

. However, in a 1994 study, Baker and others examined the

mitochondrial DNA Mitochondrial DNA (mtDNA or mDNA) is the DNA located in mitochondria, cellular organelles within eukaryotic cells that convert chemical energy from food into a form that cells can use, such as adenosine triphosphate (ATP). Mitochondrial D ...

of the big-eyed bats and found that it is actually most closely related to the

hairy big-eyed bat The hairy big-eyed bat (''Chiroderma villosum'') is a bat species from South America, South and Central America. References

Chiroderma Bats of Central America Bats of South America Bats of Brazil Mammals described in 1860 Taxa named by ...

, which is its

sister taxa In phylogenetics, a sister group or sister taxon, also called an adelphotaxon, comprises the closest relative(s) of another given unit in an evolutionary tree. Definition The expression is most easily illustrated by a cladogram: Taxon A and t ...

. The Guadelouope big-eyed bat and the hairy big-eyed bat diverged from the Brazilian big-eyed bat and the little big-eyed bat around 2.6 million years ago. The Guadeloupe big-eyed bat then diverged from the hairy big-eyed bat 2.1 million years ago.

Description

It is the largest member of its genus, ''

''. Its body length is . Its forearm is . Its

nose-leaf A nose-leaf, or leaf nose, is an often large, lance-shaped nose, found in bats of the Phyllostomidae, Hipposideridae The Hipposideridae are a family of bats commonly known as the Old World leaf-nosed bats. While it has often been seen as a su ...

is approximately long. Its hind foot is long, and its ear is long. Its fur has a woolly texture. Individual hairs are long on its back. Its hairs are mostly a pale brownish-gray; the bases of the hairs are darker, while the tips are a rich, dark brown. Some individuals have a distinct white stripe down their backs. In some individuals, the coloration of individual hairs is distinctly tricolored. Fur on its belly is grayish-brown, with individual hairs tipped in white.

Biology

It is a

diploid Ploidy () is the number of complete sets of chromosomes in a cell, and hence the number of possible alleles for autosomal and pseudoautosomal genes. Sets of chromosomes refer to the number of maternal and paternal chromosome copies, respectively ...

species, with 26

chromosome A chromosome is a long DNA molecule with part or all of the genetic material of an organism. In most chromosomes the very long thin DNA fibers are coated with packaging proteins; in eukaryotic cells the most important of these proteins are ...

s. Its

fundamental number A karyotype is the general appearance of the complete set of metaphase chromosomes in the cells of a species or in an individual organism, mainly including their sizes, numbers, and shapes. Karyotyping is the process by which a karyotype is disce ...

is 48. It is

frugivorous A frugivore is an animal that thrives mostly on raw fruits or succulent fruit-like produce of plants such as roots, shoots, nuts and seeds. Approximately 20% of mammalian herbivores eat fruit. Frugivores are highly dependent on the abundance and ...

. Little is known about its reproduction. A

lactating Lactation describes the secretion of milk from the mammary glands and the period of time that a mother lactates to feed her young. The process naturally occurs with all sexually mature female mammals, although it may predate mammals. The proces ...

female was once encountered in July. It is known to be parasitized by

mites Mites are small arachnids (eight-legged arthropods). Mites span two large orders of arachnids, the Acariformes and the Parasitiformes, which were historically grouped together in the subclass Acari, but genetic analysis does not show clear evid ...

of the family

Spinturnicidae Spinturnicidae is a family of mites in the order Mesostigmata. The mites are highly specialized parasites of wing or tail membrane or bats. Some species infest eyelids and eye canthi. The species of Spinturnicidae are found in bat habitats throug ...

(''

Periglischrus iheringi ''Periglischrus'' is a genus of mites in the family Spinturnicidae. There are more than 30 described species in ''Periglischrus'', found in South, Central, and North America, and in Africa. The species of ''Periglischrus'', like the other membe ...

''). This mite species is a common ectoparasite of

leaf-nosed bat The New World leaf-nosed bats (Phyllostomidae) are found from southern North America to South America, specifically from the Southwest United States to northern Argentina. They are ecologically the most varied and diverse family within the order ...

Range and habitat

It has been documented on the islands of

and

, both of which are part of the

Lesser Antilles The Lesser Antilles ( es, link=no, Antillas Menores; french: link=no, Petites Antilles; pap, Antias Menor; nl, Kleine Antillen) are a group of islands in the Caribbean Sea. Most of them are part of a long, partially volcanic island arc betwe ...

of the

Caribbean Sea The Caribbean Sea ( es, Mar Caribe; french: Mer des Caraïbes; ht, Lanmè Karayib; jam, Kiaribiyan Sii; nl, Caraïbische Zee; pap, Laman Karibe) is a sea of the Atlantic Ocean in the tropics of the Western Hemisphere. It is bounded by Mexico ...

. In 2016, it was documented for the first time on

Saint Kitts Saint Kitts, officially the Saint Christopher Island, is an island in the West Indies. The west side of the island borders the Caribbean Sea, and the eastern coast faces the Atlantic Ocean. Saint Kitts and the neighbouring island of Nevis cons ...

Island, which is also part of the

. This discovery expanded the known range of the species by .

Conservation

It is currently evaluated as

endangered An endangered species is a species that is very likely to become extinct in the near future, either worldwide or in a particular political jurisdiction. Endangered species may be at risk due to factors such as habitat loss, poaching and inva ...

by the

IUCN The International Union for Conservation of Nature (IUCN; officially International Union for Conservation of Nature and Natural Resources) is an international organization working in the field of nature conservation and sustainable use of natu ...

. The 2016 listing as endangered was an uplisting from its 2008 listing as vulnerable. In 2008, individuals of this species were captured in Montserrat, alleviating fears that it had gone extinct. Before this individual was captured, the last Guadeloupe big-eyed bat documented on Montserrat was in 1984. It is thought that the bat species of Montserrat could be threatened by dramatic natural events, such as hurricanes and volcanic eruptions.

References

{{Taxonbar, from=Q308771 Chiroderma Mammals described in 1976 Bats of the Caribbean Taxonomy articles created by Polbot