Simony's giant lizard

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Simony's giant lizard
Temporal range: 0.85–0  Ma
O
S
D
C
P
T
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Pg
N
Early Pleistocene–Recent
Lagarto Gigante de El Hierro, Canarias, Espana.JPG
El Hierro giant lizard (Gallotia simonyi machadoi)
CITES Appendix I (CITES) [2]
Scientific classification OOjs UI icon edit-ltr.svg
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Family: Lacertidae
Genus: Gallotia
Species:
G. simonyi
Binomial name
Gallotia simonyi
(Steindachner, 1889)
Synonyms

See text

Simony's giant lizard (Gallotia simonyi) is a large species of wall lizard endemic to the island of El Hierro and nearby islet Roque Chico de Salmor in the Canary Islands.

Contents

Etymology

The specific name, simonyi, honors Viennese naturalist Oskar Simony (1852–1915), [3] who collected the three individuals used to describe the species on Roque Chico de Salmor, in 1889. [4]

Taxonomy

Subspecies

Two subspecies are recognised:

Evolution

The genus Gallotia appeared on the eastern Canary Islands, older geologically, and expanded west as new islands emerged. Simony's giant lizard evolved from the La Gomera giant lizard after it colonized El Hierro less than 0,85 million years ago. Mitochondrial DNA studies suggest that the two subspecies separated recently, due to rising sea levels at the end of the Pleistocene. [5] Judging from subfossil remains, Simony's giant lizard was much larger before the Guanches colonized El Hierro at the end of the first millennium BC, with some individuals estimated to have surpassed one meter in total length. [4]

Description

Roque Chico de Salmor giant lizard. Lacerta simonyi.jpg
Roque Chico de Salmor giant lizard.

The species is very robust. Nasal openings touch the rostral, first supralabial, and postnasal. Five supralabials are usually before the subocular. Large temporal scales, between 25 and 81 in number. Two very large supratemporal scales. Maseteric and tympanic are present but small. The collar is serrated and made of 10 to 17 scales. There are 80-103 dorsal scales, small and on the center of the body. Ventral scales are almost square in shape, and present in 18-22 longitudinal series. [5]

Adults are black colored, with lighter legs and tail, and some light spots over the lips and the temporal region. The sides of the body have six to eight yellow ocelli, sometimes with a second row below. Ocelli are larger and more numerous in males than in females. The belly is dark brown, somewhat lighter in the external ventral scales and the posterior section of the belly. The submaxilar is black, with light spots and longitudial dark bands in the gular region. Juveniles are lighter colored than adults, with the anterior part of the back brown-reddish and the posterior gray-brown. They also have numerous ocelli on the back: yellow, green, or blueish. [5]

The species has 40 chromosomes. Males are generally larger than females, but also have proportionally larger head and longer legs. [5] The species grows and reproduces for life, which results in decreased size when animals are subjected to predation and prevented from reaching their full adult size. [4] The extinct nominate subspecies was slightly larger than the one from the mainland, even when the latter is raised in captivity without the action of predators. [5]

Related Research Articles

<span class="mw-page-title-main">Canary Islands</span> Spanish archipelago and region in the Atlantic Ocean

The Canary Islands, also known informally as the Canaries, are a Spanish autonomous community and archipelago in Macaronesia in the Atlantic Ocean. At their closest point to the African mainland, they are 100 kilometres west of Morocco and the Western Sahara. They are the southernmost of the autonomous communities of Spain. The islands have a population of 2.2 million people and are the most populous special territory of the European Union.

<span class="mw-page-title-main">El Hierro</span> Canary Island

El Hierro, nicknamed Isla del Meridiano, is the second-smallest and farthest south and west of the Canary Islands, in the Atlantic Ocean off the coast of Africa, with a population of 11,659 (2023). Its capital is Valverde. At 268.51 square kilometres (103.67 sq mi), it is the second-smallest of the eight main islands of the Canaries.

<i>Gallotia</i> Genus of lizards

The genus Gallotia are the lacertids of the Canary Islands. This genus consists of a group that has been evolving there ever since the first islands emerged from the sea over 20 million years ago. The endemic species and subspecies of this group have a number of characteristics that make them quite special within their family (Lacertidae); their only close relatives are the sandrunner lizards (Psammodromus) of the western Mediterranean region. Gallotia are characteristic for eating significant quantities of plants, and several lineages are often presented as classic examples for insular gigantism. However, a find of an even larger Gallotia species from the early Miocene of mainland Europe casts doubt on this assumption. Instead the ancestor of all modern Gallotia species of the Canary islands was probably already very large but carnivorous.

<span class="mw-page-title-main">La Gomera giant lizard</span> Species of lizard

The La Gomera giant lizard is a lacertid species that can be found on the island of La Gomera, one of the Canary Islands.

<span class="mw-page-title-main">El Hierro giant lizard</span> Subspecies of lizard

The El Hierro giant lizard is the only extant, critically endangered subspecies of Simony's giant lizard. It is endemic to El Hierro, the westernmost of the Canary Islands, where it is an official symbol.

The La Palma giant lizard is a large wall lizard endemic to the island of La Palma in the Canary Islands, currently extinct or critically endangered.

<span class="mw-page-title-main">Roque Chico de Salmor giant lizard</span> Extinct subspecies of lizard

The Roque Chico de Salmor giant lizard is the extinct nominate subspecies of Simony's giant lizard, which was endemic to the small islet Roque Chico de Salmor northwest of El Hierro, the westernmost of the Canary Islands.

<span class="mw-page-title-main">Tenerife speckled lizard</span> Species of lizard

The Tenerife speckled lizard is a recently discovered lacertid endemic to Tenerife in the Canary Islands. It is the smallest member of the clade containing the western islands' giant species.

<span class="mw-page-title-main">Boettger's lizard</span> Species of lizard

Boettger's lizard is a species of wall lizard in the family Lacertidae. The species is endemic to the Canary Islands. There are two recognized subspecies.

<i>Gallotia galloti</i> Species of lizard

Gallotia galloti, also known commonly as Gallot's lizard, the Tenerife lizard, and the Western Canaries lizard, is a species of wall lizard in the genus Gallotia. The species is native to the Canary Islands of Tenerife and La Palma. Unlike most larger species of its genus, G. galloti is a commonly found animal. There are four recognized subspecies.

<span class="mw-page-title-main">Tenerife giant rat</span> Extinct species of rodent

The Tenerife giant rat is an extinct species of rodent endemic to the island of Tenerife, the largest of the Canary Islands, Spain. Many remains have been found during archeological digs. Most remains are from the Pleistocene. Radiocarbon dating has placed some of the finds in the late Pleistocene.

Giant lizards include:

<i>Chalcides simonyi</i> Species of lizard

The Fuerteventura skink is an endangered ovoviviparous species of skink in the family Scincidae. Skinks are generally characterized by their smaller legs and less pronounced necks compared to typical lizards.

<span class="mw-page-title-main">Gran Canaria giant lizard</span> Species of lizard

The Gran Canaria giant lizard is a species of lizard in the family Lacertidae. The species is found in the Canary Islands.

<i>Gallotia goliath</i> Extinct species of lizard

Gallotia goliath is an extinct giant lizard species from the island of Tenerife of the Canary Islands, Spain. This reptile lived before the arrival of humans and is believed to have grown to at least 0.9 metres (3.0 ft) long. It was described by the German herpetologist Robert Mertens. Fossils of this lizard have been found in volcanic caves, where they often appear with those of other animals, like the Tenerife giant rat.

<span class="mw-page-title-main">Cape Verde giant skink</span> Extinct species of lizard

The Cape Verde giant skink, also called Bibron's skink, Cocteau's skink, and lagarto in Cape Verdean Portuguese, is a recently extinct species of large lizard (skink) that was endemic to some of the Barlavento Islands of Cape Verde before disappearing in the 20th century.

<span class="mw-page-title-main">Pico de Malpaso</span> Mountain in Spain

Pico de Malpaso is the highest point on the island of El Hierro in the Canary Islands, Spain.

References

  1. Jose Antonio Mateo Miras, Valentin Pérez-Mellado, Iñigo Martínez-Solano (2009). "Gallotia simonyi". IUCN Red List of Threatened Species . 2009: e.T8881A12935900. doi: 10.2305/IUCN.UK.2009.RLTS.T8881A12935900.en . Retrieved 18 November 2021.{{cite journal}}: CS1 maint: multiple names: authors list (link)
  2. "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  3. Beolens, Bo; Watkins, Michael; Grayson, Michael (2011). The Eponym Dictionary of Reptiles. Baltimore: Johns Hopkins University Press. xiii + 296 pp. ISBN   978-1-4214-0135-5. (Lacerta simonyi, p. 244).
  4. 1 2 3 4 Mateo, J. A., Barone, R., Hernández-Acosta, C. N., & López-Jurado, L. F. (2020) La muerte anunciada de dos gigantes macaronésicos: el gran escinco caboverdiano, Chioninia coctei (Duméril & Bibron, 1839) y el lagarto de Salmor, Gallotia simonyi (Steindachner, 1889). Bol. Asoc. Herpetol. Esp. Vol. 31 (2), pgs. 3-30.
  5. 1 2 3 4 5 6 Salvador, A. (2015) Lagarto gigante de El Hierro – Gallotia simonyi. In: Enciclopedia Virtual de los Vertebrados Españoles. Salvador, A., Marco, A. (Eds.). Museo Nacional de Ciencias Naturales, Madrid. http://www.vertebradosibericos.org/