Nuralagus Temporal range: | |
---|---|
Life restoration | |
Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Mammalia |
Order: | Lagomorpha |
Family: | Leporidae |
Genus: | † Nuralagus Quintana et al., 2011 |
Species: | †N. rex |
Binomial name | |
†Nuralagus rex Quintana et al., 2011 | |
Nuralagus is an extinct genus of leporid (the family of rabbits and hares), with a single species, Nuralagus rex, described in 2011. It lived on Menorca, one of the Balearic Islands in the western Mediterranean during the Pliocene epoch. It is the largest known lagomorph to have ever existed, with an estimated weight of 8–12 kilograms (18–26 lb), nearly double the weight of the average Flemish Giant rabbit. It likely went extinct at the Pliocene-Pleistocene transition when Mallorca and Menorca were united as one island, letting the mammalian fauna of Mallorca, including the goat-like ungulate Myotragus, colonize Nuralagus's habitat.
So far, all of the fossils have been found in fissure fill deposits in the northwest of Menorca, dating to sometime in the Pliocene. The material was originally preliminarily described by Pons-Moya et al. in 1981, who referred it to cf. Alilepus. The genus and species Nuralagus rex were described in 2011 in a full description of the material, which included the front half of a skull, as well as numerous isolated postcranial bones corresponding to most of the skeleton. [1]
With a height of half a meter and an estimated weight of 12 kg (26 lb), [1] [2] or 8 kg (18 lb) [3] the species is the largest known lagomorph, being ten times the weight of the average wild European rabbit ( Oryctolagus cuniculus ) and around double the weight of the average Flemish Giant rabbit. Its size was likely due to island gigantism. It had a comparatively small skull relative to its body size and small sensory receptors, including orbits and tympanic bullae, suggesting reduced senses of hearing and eyesight. [1] Nuralagus rex had a short and stiff spine which resulted in low mobility and an inability to jump like other leporids. [4] Bone histology analysis suggests that the species was sexually dimorphic, with females being larger than males. The growth lines within the bones suggest that the large body size was the result of growing over a longer period of time, rather than the result of increasing growth rates. The age of sexual maturity was estimated at 3.6 years for females and 6.2 years for males, considerably higher than would be expected solely based on bodymass. [5]
Nuralagus rex likely entered what is now Menorca during the Messinian Salinity Crisis 5.96-5.3 million years ago. During this event, the Strait of Gibraltar closed, leading to the desiccation of the Mediterranean Sea, resulting in the connection of the islands to the Iberian Peninsula, letting Nuralagus's ancestor colonize the area. The subsequent Zanclean flood 5.3 million years ago then returned the Mediterranean to its original sea levels, isolating Nuralagus's ancestor on Menorca. [6] There is a dearth of knowledge about the evolutionary history of Nuralagus rex in relation to other lagomorphs. However, similarities between the dental morphology of Nuralagus and Eurasian members of the extinct genus Alilepus have led to speculation that Alilepus is closely related to and, possibly, the ancestor of Nuralagus. [1] [7] The only other mammal native to Menorca during the Pliocene was the extinct giant dormouse species Muscardinus cyclopeus, which belongs to the same genus as the living hazel dormouse, with a herpetofauna including the giant tortoise Solitudo gymnesica, snakes, amphisbaenian, lacertid and gekkonid lizards, and alytid frogs. [8] Nuralagus probably became extinct around the end of the Pliocene and the beginning of the Pleistocene, corresponding with the colonisation of Menorca by the mammals that lived on Mallorca (comprising the goat-antelope Myotragus , the shrew Nesiotites and the dormouse Hypnomys ) due to the islands being connected during low sea level episodes as a result of Quaternary glaciation. [9] [10]
Nuralagus's unique traits were most likely the product of an insular environment containing no natural predators. Physical similarities between Nuralagus rex and Pentalagus furnessi (an extant insular lagomorph which until recently also did not have natural predators) despite the phylogenetic and geographical distance between the two species further supports this inference. [1]
Menorca or Minorca is one of the Balearic Islands located in the Mediterranean Sea belonging to Spain. Its name derives from its size, contrasting it with nearby Mallorca. Its capital is Mahón, situated on the island's eastern end, although Menorca is not a province and forms a political union with the other islands in the archipelago. Ciutadella and Mahón are the main ports and largest towns. The port of Mahón is the second biggest natural port in the world.
A pika is a small, mountain-dwelling mammal native to Asia and North America. With short limbs, a very round body, an even coat of fur, and no external tail, they resemble their close relative, the rabbit, but with short, rounded ears. The large-eared pika of the Himalayas and nearby mountains lives at elevations of more than 6,000 m (20,000 ft).
The Balearic shearwater is a medium-sized shearwater in the seabird family Procellariidae. Puffinus is a Neo-Latin loanword based on the English "puffin" and its variants, that referred to the cured carcass of the fat nestling of the Manx shearwater, a former delicacy. The specific mauretanicus refers to Mauretania, an old name for an area of North Africa roughly corresponding to Morocco and Algeria. The Balearic Shearwater is listed critically endangered by the IUCN and is one of Europe's most endangered seabirds.
The Sardinian pika is an extinct species of lagomorph that was endemic to the islands of Sardinia, Corsica and neighbouring Mediterranean islands until its extinction likely in Roman times. It was the last surviving member of Prolagus, a genus of lagomorph once widespread throughout Europe during the Miocene and Pliocene epochs, whose closest living relatives are pikas of the genus Ochotona.
Myotragus is an extinct genus of goat-antelope in the tribe Caprini which lived on the Balearic Islands of Mallorca and Menorca in the western Mediterranean until its extinction around 4,500 years ago. The fossil record of Myotragus on the Balearic Islands extends over 5 million years back to the early Pliocene on Mallorca, where it presumably arrived after the evaporation of the Mediterranean Sea during the Messinian Salinity Crisis.
The Ibiza rail is a recently discovered fossil species of rail, described from a late Pleistocene to Holocene cave deposit at Es Pouàs, on the island of Ibiza. Ibiza is in the Pityuses group of the Spanish Balearic Islands in the Mediterranean Sea. The Ibiza rail was a relative of the extant water rail and may be derived from it, but was a bit smaller and stouter, had shorter and more robust hind limbs and shorter wings, with probably reduced its flight capability. Consequently, it might have also occurred on neighbouring Formentera, where no possible locations have been surveyed.
Palaeoloxodon falconeri is an extinct species of dwarf elephant from the Middle Pleistocene of Sicily and Malta. It is amongst the smallest of all dwarf elephants at under 1 metre (3.3 ft) in height. A member of the genus Palaeoloxodon, it derived from a population of the mainland European straight-tusked elephant.
Candiacervus is an extinct genus of deer native to Pleistocene Crete. Due to a lack of other herbivores, the genus underwent an adaptive radiation, filling niches occupied by other taxa on the mainland. Due to the small size of Crete, some species underwent insular dwarfism, the smallest species, C. ropalophorus, stood about 40 centimetres (16 in) at the shoulders when fully grown, while other species were relatively large and comparable in size to mainland deer species. Some species are noted for their peculiar, elongate club-shaped antlers, though other species have more normal antlers.
Asoriculus is an extinct genus of terrestrial shrews in the subfamily Soricinae and tribe Nectogalini, native to Europe and North Africa.
The Balearic Islands are an archipelago in the western Mediterranean Sea, near the eastern coast of the Iberian Peninsula. The archipelago forms a province and autonomous community of Spain, with Palma de Mallorca being its capital and largest city.
Hypolagus is an extinct genus of lagomorph, first recorded in the Hemingfordian of North America. It entered Asia during the early Turolian and spread to Europe not much later, where it survived until the Middle Pleistocene. Though unknown in the Iberian Peninsula, fossils of this genus have been found in the Balearic Islands, suggesting an eastern migration during the dry period in the Mediterranean region known as the Messinian Salinity Crisis.
Hypnomys, otherwise known as Balearic giant dormice, is an extinct genus of dormouse (Gliridae) in the subfamily Leithiinae. Its species are considered examples of insular gigantism. They were endemic to the Balearic Islands in the western Mediterranean from the Early Pliocene until their extinction around 4,000 years ago. They first appeared in the fossil record on Mallorca during the Early Pliocene, presumably due to the Messinian salinity crisis causing a connection with mainland Europe. They later spread to Menorca, and a possible molar is also known from Ibiza. Hypnomys became extinct during the Holocene after human arrival on the Balearics. They were one of only three native land mammals to the islands at the time of human arrival, alongside the shrew Nesiotites and goat-antelope Myotragus.
Pterodromoides is an extinct genus of fulmarine petrel dating from the Late Miocene. It contains a single species, P. minoricensis. Its fossil remains were first discovered at the Punta Nati palaeontological site on the island of Menorca in the Balearic archipelago of the western Mediterranean. An additional specimen from North Carolina, USA has also been referred to this species, suggesting it lived across the North Atlantic. It was described in 2001, with the authors justifying the creation of a new genus by the large orbitonasal opening and characters of the postcranial skeleton, despite the similarity of the cranial osteology to that of Pagodroma.
Leithia is an extinct genus of giant dormice from the Pleistocene of the Mediterranean islands of Malta and Sicily. It is considered an example of island gigantism. Leithia melitensis is the largest known species of dormouse, living or extinct, being twice the size of any other known species.
Nesiotites is an extinct genus of large red-toothed shrews belonging to the tribe Nectogalini known from the latest Miocene/Early Pliocene to Holocene of the Balearic Islands of Mallorca and Menorca.
Dopasia is a genus of lizards in the family Anguidae. The genus contains seven species, which are native to Asia. They are most closely related to the North American Ophisaurus, and are sometimes considered part of that genus.
Titanochelon is an extinct genus of giant tortoises known from the Early Miocene to the beginning of the Pleistocene in Europe, extending from the Iberian Peninsula to Anatolia. Some members of the genus were larger than extant giant tortoises, with a shell length of up to 2 m.
Solitudo is an extinct genus of tortoise that was found during the Pliocene and Pleistocene on the Mediterranean islands of Menorca, Malta and Sicily. The genus includes three described species, Solitudo robusta, Solitudo gymnesica and Solitudo sicula as well as a likely fourth, undescribed species from Monte Pellegrino in Sicily. Solitudo sicula, the youngest of the species, died out approximately 12.5 thousand years BP. The largest species, Solitudo gymnesica, has been estimated to have reached a carapace length of 1.1–1.3 m (3.6–4.3 ft).