Sheltopusik

Sheltopusik
Scientific classification Edit this classification
Kingdom: Animalia
Phylum: Chordata
Class: Reptilia
Order: Squamata
Suborder: Anguimorpha
Family: Anguidae
Genus: Pseudopus
Species:
P. apodus
Binomial name
Pseudopus apodus
(Pallas, 1775)
Synonyms
List

The sheltopusik, also spelled scheltopusik, sheltopusick, scheltopusick, sheltopusic, or scheltopusic /ˌʃɛltəˈpjuːzɪk/ (Pseudopus apodus), and also commonly known as Pallas's glass lizard, the European legless lizard, or the European glass lizard, is a species of large glass lizard in the family Anguidae. The species is found from Southern Europe to Central Asia. There are three recognized subspecies.

Taxonomy

The sheltopusik was previously included in the genus Ophisaurus, but has since been placed in its own genus Pseudopus, as Pseudopus apodus. It was originally described in 1775 by Peter Simon Pallas as Lacerta apoda.

Subspecies

There are three subspecies that are recognized as being valid, including the nominotypical subspecies.

Nota bene: A trinomial authority in parentheses indicates that the subspecies was originally described in a genus other than Pseudopus.

Despite only being described in 2021, P. a. levantinus is the largest and most genetically diverse of the subspecies, indicating an older and more complex evolutionary history compared to its sister subspecies.

Etymology

The scientific name, Pseudopus apodus, comes from Greek ψευδοποδος άποδος, literally meaning "fake foot, no foot".

The common name "sheltopusik" comes from Russian желтопузик (zheltopuzik), which translates most directly as "yellow-bellied".

Skull anatomy

In Greece

The skull of Pseudopodus apodus is elongated, twice as long as it is wide and widest at the posteroventral portions of the jugals, where the cheeks proceed to narrow into the snout. The exonarial fenestra (external naris) is similarly elongated and elliptical. The orbits, which lie in a posterior portion of the anterior part of the skull, are large.

The premaxillary–maxilla has an elongated opening and has rounded ends. It is positioned between the forked premaxillary process of the maxilla and the maxillary and vomeromaxillary processes of the premaxilla.

Description

The sheltopusik can reach a total length (tail included) of 135 cm (4.43 ft). It is tan-colored, paler on the ventral surface and the head, with a ring-like/segmented appearance that makes it look like a large earthworm, with a distinctive fold of skin down each side called a lateral groove. Small (2-mm) rear legs are sometimes visible near the cloaca. Though the legs are barely discernible, the sheltopusik can be quickly distinguished from a snake by its ears, eyelids, and lack of enlarged ventral scales. This species exhibits sexual dimorphism as males are on average larger than females.

Adult
Juvenile

Habitat and behaviour

Musking

Pseudopodus apodus inhabits open country, such as short grassland or sparsely wooded hills. A preference for microhabitats that exhibit areas with sunlight and shade close together has been observed. It consumes arthropods and small mammals. Snails and slugs appear to be its favorite prey, which may explain why it is particularly active in wet weather, although it prefers a dry habitat. Breaking through the shells of snails is an especially easy task due to its teeth and jaw structure.

Defensive behaviour

Shown here with a missing tail, the sheltopusik can autotomize its tail.

Due to its size, the sheltopusik tends to respond to harassment by hissing, biting, and musking. It is less likely to drop its tail than some other species that display caudal autotomy. However, these occasional displays of caudal autotomy are responsible for the name "glass lizard" (or "glass snake"). The released tail may break into pieces, leading to the myth that the lizard can shatter like glass and reassemble itself later. In reality, if the tail is lost, it grows back slowly, but is shorter and darker. The replacement tail may grow back to full length after an extended period of time.

Reproduction

About 10 weeks after mating, the female Pseudopodus apodus lays about eight eggs, which she hides under bark or a stone, and often guards them. The young hatch after 45 to 55 days. They are typically about 15 cm (5.9 in) long and usually start to eat after four days.

In captivity

With an ocellated lizard at the Artis Royal Zoo

The sheltopusik is frequently available in the exotic pet trade, though rarely captive-bred. It does not typically tolerate a large amount of handling, but it adaptsto captivity well, feeding on crickets, meal worms, small mice, eggs, snails, or pieces of meat. It is even known to accept these meals from a keeper's tweezers or hand, once it becomes used to captivity. However, the sheltopusik does get excited around food, and it has surprisingly powerful jaws. It makes a hardy captives, capable of living up to 50 years.

Relationship with humans

Remains of the Levant subspecies (Pseudopodus apodus levantinus) are known from Natufian sites in Israel, suggesting that it was eaten by the local population at the time.

References

  1. ↑ Aghasyan, A.; Avci, A.; Tuniyev, B.; Crnobrnja-Isailovic, J.; Lymberakis, P.; Andrén, C.; Cogalniceanu, D.; Wilkinson, J.; Ananjeva, N.B.; Üzüm, N.; Orlov, N.L.; Podloucky, R.; Tuniyev, S.; Kaya, U.; Disi, A.M.; Hraoui-Bloquet, S.; Sadek, R.; Tok, V.; Ugurtas, I.H.; Sevinç, M.; Haxhiu, I.; Borkin, L.; Shestapol, A.; Dujsebayeva, T.; Golynsky, E.; Chirikova, M.; Nuridjanov, D. (2021). "Pseudopus apodus ". IUCN Red List of Threatened Species. 2021 e.T157263A745759. doi:10.2305/IUCN.UK.2021-3.RLTS.T157263A745759.en. Retrieved 20 February 2022.
  2. 1 2 Species Pseudopus apodus at The Reptile Database www.reptile-database.org.
  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. (Pseudopus apodus, p. 199).
  4. ↑ Lacerta apoda. Peter Simon Pallas. Published: 1775.
  5. 1 2 3 Jablonski, Daniel; Ribeiro-Júnior, Marco Antônio; Meiri, Shai; Maza, Erez; Kukushkin, Oleg V.; Chirikova, Marina; Pirosová, Angelika; Jelić, Dušan; Mikulíček, Peter; Jandzik, David (2021). "Morphological and genetic differentiation in the anguid lizard Pseudopus apodus supports the existence of an endemic subspecies in the Levant". Vertebrate Zoology. 71: 175–200. doi:10.3897/vz.71.e60800. ISSN 2625-8498. S2CID 233422513. (Pseudopodus apodus levantinus, new subspecies). (in English, with abstracts in Hebrew and Arabic).
  6. ↑ Н. Б. Ананьева (2004). Атлас пресмыкающихся Северной Евразии: таксономическое разнообразие, географическое распространение и природоохранный статус. Зоол. инст. РАН. ISBN 978-5-98092-007-4. (in Russian).
  7. 1 2 Klembara, Jozef; Dobiašová, Karolína; Hain, Miroslav; Yaryhin, Oleksandr (2017). "Skull Anatomy and Ontogeny of Legless Lizard Pseudopus apodus (Pallas, 1775): Heterochronic Influences on Form". The Anatomical Record. 300 (3): 460–502. doi:10.1002/ar.23532. PMID 27981780 – via American Association for Anatomy.
  8. ↑ Glavaš, Olga Jovanović; Počanić, Paula; Lovrić, Vanja; Derežanin, Lorena; Tadić, Zoran; Lisičić, Duje (2020). "Morphological and ecological divergence in two populations of european glass lizard, Pseudopus apodus (Squamata: Anguidae)". Zoological Research 41 (2): 172–181. doi:https://doi.org/10.24272/j.issn.2095-8137.2020.025
  9. ↑ Vujović, Ana; Pešić, Vladimir; Meek, Roger (2025). "Thermal Ecology of Hermann's Tortoise, Testudo hermanni and Glass Lizard Pseudopus apodus in a Seasonal Environment". Diversity. 17 (9): 638. Bibcode:2025Diver..17..638V. doi:10.3390/d17090638. ISSN 1424-2818.
  10. ↑ Schuster, Ruth (2021). "Lizards Eaten by Prehistoric People in Today's Occupied Palestinian territory Were Unknown Subspecies". Haaretz. Archived from the original on April 14, 2021.

Further reading