LACERTID LIZARDS: A Guide (original) (raw)

Last updated 24 March 2009: added an Update section on the latest suggested classification of the Lacertidae, as well as making a few slight amendments and updating the Links section.

LACERTID LIZARDS

and other members of the family Lacertidae

Introduction

Lacertids is a term that is more or less synonymous with the lizards of the family Lacertidae, particularly the Lacerta species themselves. Most Europeans will probably unconsciously think of a lacertid if the word "lizard" is mentioned, and indeed Lacertids are very much an Old World family, centred in Europe (not a continent renowned for its reptiles) but also with species in Africa and Asia. Many make good pet lizards, but there is still no single popular English language book dedicated to them, unlike the more widely kept Leopard Geckos, Blue-Tongued Skinks and Bearded Dragons, for example.

What follows is a rough guide to the Lacertidae family, its genera and species, with a special emphasis on the Lacerta and Podarcis species. The data herein has been compiled from several sources, and also from a bit of personal experience with these marvellous lizards.

The family Lacertidae

Lizard taxonomy (classification) is in a state of flux at the moment, and a number of traditional designations have been overthrown in the last few years, both by fairly certain methods (eg mitochondrial DNA testing) and the more controversial "splitting", whereby established groupings are broken up into smaller units and further subspecies are added, often on the basis of unsure characteristics such as colouring. This guide will try to give both the long-established species names and the new ones.

The Lacertidae are members of the infraorder Scincomorpha, a group that also includes the skinks (Scincidae), cordylids or sungazers (Cordylidae), plated lizards, zonosaurs and relatives (Gerrhosauridae) and tegus and racerunners (Teiidae), plus the lesser known night lizards (Xantusiidae) and dibamids (Dibamidae). As the name "scincomorph" implies, most of these lizards have similar shaped bodies, ie skink-like, although the night lizards outwardly might seem to resemble geckos. Unlike skinks, however, lacertids are fairly conservative in structure, with little or no limb reduction and a fairly similar body design throughout the different genera: pointed snout, long whiplike tail and sexual differentiation through colour and pores, and often jowls in older males. Most are egg layers.

The table further down should, strictly speaking, be divided into two subfamilies, the Gallotiinae (Gallotia and Psammodromus) and Lacertinae (all the rest) (see also 2009 Update further down).

Characteristics of the family

Lacertids are characterised by the following traits:

• Tail is almost always longer than the body.
• Upper temporal arches are completely ossified.
• Pterygoid and palatine bones are paired and lie close together anteriorly: pterygoids often bear a group of palatal teeth
• Dentition is pleurodont: teeth rather uniform, with 1-3 points, and set on paired maxilla and single premaxilla of upper jaw, and on paired dentary bones of lower jaw.
• No dermal ossifications on trunk and tail, but shields on top of head are underlain by bony elements which are inseparably fused to bones of skull: dermal ossifications at temples and on back part of jaw.
• Head shields are partly if not wholly enlarged and symmetrically arranged.
• Dorsal scales may be flalt or have bosses or keels, and may be flush or imbricate (overlapping).
• Ventral scales are always larger than the dorsal scales and are arranged in distinct transverse and longitudinal rows.
• Tail scales are set in whorls.
• Throat scales are usually set off from breast scales by a transverse fold. The edge of this fold points backwards and bears enlarged scales.
• Femoral pores are usually present. A smaller lower eyelid window is found in L. perspicillata and in the genera Philochortus, Latastia and Holaspis. Ophisops has an entirely transparent eyelid.

Distribution of the family

Lacertidae are most often associated with Europe (at least in the minds of Europeans!), but it remains true that seven genera in the family are found on that continent if one takes Turkey as part of Europe. Lacerta are found in every part of the continent, including the fairly reptile-free areas such as Ireland and Scandinavia, and Podarcis is a large European genus whose species furthermore have in some cases a very high number of subspecies.

There is a surprisingly large number of little-known Lacertidae genera in Africa. Most of these seem to be based in East Africa, but some have spread as far as North, West and Central Africa. There is little information commonly available on these interesting lizards, partly no doubt due to the difficult climatic, geographical and political conditions of the continent, but also due to the shy or secretive nature of many of these species. It is an interesting anomaly that in southern Africa, separated from their European, North African and Asian brethren, exist eight genera of the Lacertidae. How this separation came about is still uncertain. Nor have these lizards greatly diverged in form from their more northerly relatives.

Asia is somewhat underrepresented since - depending on one's definition of Asia - there are really only two or three genera of Asian lacertids, of which only Takydromus, the Grass Lizards, can be considered tropical. Nevertheless these are widespread and found as far afield as Indonesia. Eremias has a wide distribution in the colder parts of Asia, being found in the steppes from its most westerly point in SE Europe as far east as Mongolia and China. The genus Timon is placed here also since it is little known and two of its three species occur in Turkey, which might just qualify as Asia. This would be less anomalous if the genus did not also include (according to some authorities, including EMBL) the Ocellated Lizard Timon lepidus (formerly known as Lacerta lepida) of southern France, northern Spain and northern Italy.

For those wishing to consider the lacertids by rough area of distribution and/or genus size, I offer the following table:

Availability and Breeding

Time was when virtually all European hobbyists started in their youth by keeping one of the European Lacerta or Podarcis species. The change of political and ecological climate have however caused a complete alteration of the situation, so that nowadays aspiring lizard keepers are far more likely to keep admittedly non-difficult species from Central Asia or Australia, while lacertids are now seen as a specialisation rather than a stepping stone. At present members of the Lacerta and Podarcis genera are still seen in the pet trade, albeit infrequently, along with a number of Takydromus and a very much smaller number of Eremias (the latter being reportedly difficult to keep alive, being short-lived in the wild in any case). At the moment virtually all non-European individuals (South African species are all prohibited from export) are wild-caught, and while this does not seem to be placing a strain on the indigenous populations, in the interests of conservation we ought to be making every effort to produce more captive offspring. This is especially so as nearly all European lizards are now protected by law, while those in Africa and Asia are subject to ongoing environmental degradation of their habitats and political uncertainty.

| | QUICK INDEX | | | | -------------------------------------------------------------- | ------------------------------------------------------------ | ------------------------------------------------ | | Acanthodactylus, Fringe-Fingered Lizards | Adolfus, Forest Lizards | Algyroides, Algyroides | | Austrolacerta, Rock Lizards | Darevskia, Rock Lizards | Eremias, Steppe Runners | | Gallotia, Canary Island Lizards | Gastropholis, Keel-Bellied Ground Lizards | Heliobolus, Bushveld Lizards | | Holaspis, Blue-Tailed Tree Lizard | Ichnotropis, Rough-Scaled Lizards | Lacerta, Green Lizards | | Latastia, Long-Tailed Lizards | Meroles, Desert Lizards | Mesalina, Tiger Lizards | | Nucras, Sandveld Lizards | Ophisops, Snake-Eyed Lizards | Pedioplanis, Sand Lizards | | Philochortus, Orange-Tailed Lizards | Podarcis, Wall Lizards | Poromera, Striped Lizard | | Pseuderemias, Greater Racerunners | Psammodromus, Psammodromus | Takydromus, Asian Grass Lizards | | Timon, Jewelled Lizards | Tropidosaurus, Mountain Lizards | |

2009 Update

A search on Lacertidae in the JCVI Reptile Database in March 2009 shows the following amendments to the above table:

• The genus Anatolalacerta is formed of three species (anatolica, danfordi and oertzeni) taken from the genus Lacerta;
• The genus (or subgenus) Apathya receives the two former Lacerta species cappadocica and yassujica;
• Archaeolacerta is now the genus (or subgenus, depending on the authority) for the species formerly known as Lacerta bedriagae;
• Atlantolacerta is now the genus for the species formerly known as Lacerta andreanskyi;
• Dalmatolacerta takes over Lacerta oxycephala;
• Lacerta mosorensis is split into two species and reassigned to the new genus Dinarolacerta (containing D. mosorensis and new species D. montenegrina);
• Lacerta graeca becomes Hellenolacerta graeca;
• The genus Iberolacerta is assigned the species aranoi, aurelioi, bonnali, cyreni, galani, horvathi and monticola;
• The Iranian Lacerta species brandtii and zagrosica are assigned to the new genus Iranolacerta;
• The genus Omanosaura contains the Middle Eastern lacertids cyanura and jayakara;
• Two small lacertids, L. parva and L. fraasii, are assigned to the new genus Parvilacerta;
• Three other Lacerta species, cyanisparsa, kulzeri and laevis, are assigned to the new genus Phoenicolacerta;
• Scapteira, formerly a subgenus of Eremias, is affirmed as a valid genus for S. aporosceles (otherwise assigned to Eremias).
• The species perspicillata, formerly assigned to Lacerta or Podarcis, gets its own genus, Scelarcis.
• Podarcis dugesii becomes Teira dugesii.
• Finally, the subfamilies Gallotinae and Lacertinae are now joined by Eremiainae, which contains the African genera including Acanthodactylus and Eremias but excluding Australolacerta. Of these changes, Archaeolacerta, Iberolacerta, Omanosaura and Teira have been around for a few years and appear to have gained acceptance. Some of the others are rather newer, and I take the view that it is worth waiting for a while to see whether they become set in stone, given the frenzy of reclassification in the world of zoology at the moment.

Bibliography

There does not seem to be a single contemporary English-language book devoted to the Lacertidae, either their care in captivity or their natural history in the wild. However, several books offer sections on their care or ecology, and the Internet has proven to be a useful source of taxonomic information, especially the ever-reliable TIGR Reptile Database, which has a slender but very useful reference at the end.

Collins Field Guide: Reptiles & Amphibians of Britain & Europe, E N Arnold, J A Burton and D W Ovenden, HarperCollins, 2nd edition 2002. Follows the fairly conservative approach I have adopted here, ie most of the lacertids are still Lacerta or Podarcis.

Field Guide to Snakes and Other Reptiles of Southern Africa, Bill Branch, Struik, Cape Town 1998.

PraxisRatgeber: Eidechsen, Manfred Rogner, Edition Chimaira 2002, Frankfurt am Main. This German-language book is so far the only one I know that is dedicated to the Lacertidae, including their husbandry and breeding. It covers all the genera, although some (notably the Africans) are discussed fairly generally and briefly. The major European species are well covered and a bonus is a listing of each genus and species at the back of the book. Hopefully the publishers will produce an English translation soon.

A-Z of Lizard Care, Bartlett & Bartlett, Barrons, 1995. Good but brief sections on a few Lacerta lizards.

Keeping and Breeding Lizards, Mattison, Blandford 1996. A good chapter on the entire Lacertidae family that covers many of the lizards, even some not normally seen in captivity.

Echsen [Lizards] Vol 2, Rogner, Ullmer Verlag, 1992. Usually a very good source of information, although it has been pointed out to me by one source in at least one section there was a "theoretical" guess as to the captive requirements of a particular species that is in reality very hard to keep alive.

Animal Life Encyclopedia Volume 6: Reptiles

, Grzimek,1975.

Links

www.lacerta.de is an excellent site, the chief drawback for English speakers being that it is in German.

The Lacertidae page of the JCVI reptile database contains a good summary, a phylogeny and a bibliography. I am indebted to the database for some of the information on this page concerning recent taxonomic changes.

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