Mascarenotus Sauzieri
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The
extinct Extinction is the termination of an organism by the death of its Endling, last member. A taxon may become Functional extinction, functionally extinct before the death of its last member if it loses the capacity to Reproduction, reproduce and ...
Mauritius scops owl (''Otus sauzieri''), also known as Mauritius owl, Mauritius lizard owl, Commerson's owl, Sauzier's owl, or Newton's owl, was
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 ...
to the
Mascarene The Mascarene Islands (, ) or Mascarenes or Mascarenhas Archipelago is a group of islands in the Indian Ocean east of Madagascar consisting of islands belonging to the Republic of Mauritius as well as the French department of Réunion. Their na ...
island of
Mauritius Mauritius, officially the Republic of Mauritius, is an island country in the Indian Ocean, about off the southeastern coast of East Africa, east of Madagascar. It includes the main island (also called Mauritius), as well as Rodrigues, Ag ...
. It is known from a collection of
subfossil A fossil (from Classical Latin , ) is any preserved remains, impression, or trace of any once-living thing from a past geological age. Examples include bones, shells, exoskeletons, stone imprints of animals or microbes, objects preserved ...
bones from the
Mare aux Songes The Mare aux Songes (English: "pond of taro"; ) swamp is a lagerstätte located close to the sea in south eastern Mauritius. Many subfossils of recently extinct animals have accumulated in the swamp, which was once a lake, and some of the first sub ...
swamp, a detailed sketch made by de Jossigny in 1770, a no less detailed description by Desjardins of a bird shot in 1836, and a number of brief reports about owls, the first being those of Van Westzanen in 1602 and Matelief in 1606.


Taxonomy

No descriptions of owls were recorded between the mid-17th and the late 18th century. This led to considerable confusion, especially since the bones were referred to ear tuft-less '' Strix'' or
barn owl The barn owls, owls in the genus '' Tyto'', are the most widely distributed genus of owls in the world. They are medium-sized owls with large heads and characteristic heart-shaped faces. They have long, strong legs with powerful talons. The ter ...
s, whereas the image and the description unequivocally show the presence of ear tufts. Thus, it was for a long time believed that 2 or even 3 species of owls occurred on the island. The supposed "barn owl" ''Tyto newtoni'' was described from
tarsometatarsus The tarsometatarsus is a bone that is only found in the lower leg of birds and some non-avian dinosaurs. It is formed from the fusion of several bird bones found in other types of animals, and homologous to the mammalian tarsus (ankle bones) a ...
bones of what probably was a male individual of this species, whereas the Mauritius owl's
type Type may refer to: Science and technology Computing * Typing, producing text via a keyboard, typewriter, etc. * Data type, collection of values used for computations. * File type * TYPE (DOS command), a command to display contents of a file. * ...
specimen seems to be a bone of a larger female bird. But the bird was neither a ''Strix'' nor a barn owl. Instead, the Mascarene owls of the genus ''Mascarenotus'' were most probably members of the scops owl lineage. The Mauritius bird was the largest species of its genus, with a total length of approximately 60 cm. Its scientific name honours Théodore Sauzier, who made the first bones available for scientific study. In 2018, a DNA study by Louchart and colleagues found that the ''Mascarenotus'' owls grouped among species of ''Otus'' (the scops owls), and therefore belonged to that genus. The cladogram below shows the placement of the Mauritius scops owl:


Extinction

The Mauritius scops owl was the largest carnivore on the island prior to human settlement. Thus, unlike other local species of birds, it was not much affected by the introduction of predators such as cats, rats, and
crab-eating macaque The crab-eating macaque (''Macaca fascicularis''), also known as the long-tailed macaque or cynomolgus macaque, is a cercopithecine primate native to Southeast Asia. As a synanthropic species, the crab-eating macaque thrives near human settlem ...
s. In the 1830s, the species seems to have been not uncommonly found in the southeastern part of the island, between Souillac and the Montagnes Bambous due east of
Curepipe Curepipe (), also known as ''La Ville-Lumière'' (The City of Light), is a town in Mauritius, located mainly in the Plaines Wilhems District. Its eastern part lies in the Moka District. The town is administered by the Municipal Council of Cure ...
, with the last testimony of observations referring to several encounters in 1837. However, as the cultivation of
sugarcane Sugarcane or sugar cane is a species of tall, Perennial plant, perennial grass (in the genus ''Saccharum'', tribe Andropogoneae) that is used for sugar Sugar industry, production. The plants are 2–6 m (6–20 ft) tall with stout, jointed, fib ...
and
tea Tea is an aromatic beverage prepared by pouring hot or boiling water over cured or fresh leaves of '' Camellia sinensis'', an evergreen shrub native to East Asia which probably originated in the borderlands of south-western China and nor ...
encroached upon its
habitat In ecology, habitat refers to the array of resources, biotic factors that are present in an area, such as to support the survival and reproduction of a particular species. A species' habitat can be seen as the physical manifestation of its ...
, combined with reckless shooting, it disappeared rapidly. In 1859, Clark wrote that the bird was extinct.


References

* Newton, Alfred & Gadow, Hans Friedrich (1893): On additional bones of the Dodo and other extinct birds of Mauritius obtained by Mr. Théodore Sauzier. ''Trans. Zool. Soc.'' 13: 281–302, plate 33: figures 11–18. {{Taxonbar, from=Q616205 Extinct birds of Indian Ocean islands Otus (bird) Bird extinctions since 1500 Birds of Mauritius Birds described in 1893 Extinct animals of Mauritius Species made extinct by human activities Taxa named by Hans Friedrich Gadow Mascarenotus Taxobox binomials not recognized by IUCN