Monday, 28 June 2010

Prehistoric Animal Alphabet



Prehistoric Animal Alphabet
Colour pencil illustrations
June 2010

Above is a collection of twenty-six illustrations, each a stylised letter of the alphabet. They are styled to look like various prehistoric creatures, some are based loosely on existing types, others completely made up. All of them have been given a binomial, with each name beginning with the letter the animal represents, and a bit of geological/biological 'information' has been made up to go with each animal. To reiterate, none of these animals actually exists or have ever existed, and I cannot guarantee that all the names I have given them are unique and not synonyms (technically these are all nomina nuda, but anyway, enjoy...)



Alpharaptor aetonyx (meaning 'eagle-clawed "A" plunderer) was a purple-feathered theropod from late Cretaceous China. It had large, eagle-like talons on all four limbs and preyed upon small birds and mammals.



Betasaurus beryllinus ('beryl-like "B" lizard) was a medium-sized hadrosaur from late Cretaceous Alberta. It lived in large herds to defend itself from large tyrannosaurs, and fed upon cycads. The B-shaped head enabled Betasaurus to produce a sound somewhat like a euphonium.



Cyanosuchus cadaverinus ('corpse-like blue crocodile', from the colour and odour of the fossil remains) was a mesoeucrocodylian from Early Cretaceous southern England. It was a fish-eater and swam in freshwater lagoons.



Deltaceratops dipsomanius ('alcoholic "D" horned face') was a protoceratopsid from Late Cretaceous Mongolia. It lived in deserts and fed upon whatever ground cover it could find. Its specific epithet 'dipsomanius' was derived from the sprawled position of the type specimen.



Epsilonodactylus erebennus ('gloomy "E" finger) was a pteranodontid pterosaur from Late Cretaceous Argentina. It was discovered on a particularly gloomy day. It was a fish-eater, being most partial to sharks. It is thus believed to be an oceanic wanderer, like today's albatrosses.



Falcunguis ferox ('ferocious sickle claw') is only known from the claws and phalanges of two digits. It is believed to be an ancestor of the therizinosaurs, due to its geological and geographical distribution in Early Cretaceous China.



Gammasaurus geophagus ('earth eating "G" lizard) was a small coelurosaur with a very long tail which curved backwards over its body. It used the elongated tail to carry leaves which it used to shade itself in hot weather. It dates from the late Jurassic of Bavaria and ate large subterranean insects. Fossilised beetle remains were found in the stomachs of several well-preserved specimens of Gammasaurus geophagus, but these were erroneously believed to be examples of fossilised earth (so basically, rocks).



Hypsiloura helioscopus ('sky gazing high tail') was a camarasaurid from late Jurassic Montana. It was a medium-sized sauropod, capable of reaching tall monkey puzzles in search of foliage and pine cones. It was able to camouflage itself against the trunks of such trees by erecting its neck and tail and pretending to be a tree.



Iotatitan ischyrus ('strong "I" giant) was a titanosaurid from late Cretaceous Argentina. It was the largest sauropod ever known, and it is only known from a single partial cervical vertebra, but its total length has been extrapolated as anywhere from 27 m at the most conservative to 1.3 km at the other extreme. Since nothing is known of the skull or dentition, we cannot say anything about the diet of Iotatitan, except that it definitely ate something, and a lot of it.



Jovigyrinus jocosus ('joking Bon Jovi's salamander') was an early tetrapod from Devonian New Jersey. It was named after local rock band Bon Jovi. Jon Bon Jovi, the lead singer of the band, who is also an unsuccessful actor, has been quoted as saying about the animal, "Wow, at last something in the last two decades I can be proud of!" The animal was probably a predator of small fish and aquatic invertebrates such as trilobites in shallow seas, and would have had external gills like modern salamander larvae and axolotls.



Kappatherodon keiolophus ('cloven-crested "K" mammal-tooth') was a sphenacodontid therapsid related to Dimetrodon, but can be distinguished from it by its cloven back sail. Like its relative, it dates from the Permian of Texas and was a predator of smaller therapsids. It could only be active on hot days, between the hours of 10 and 11 a.m. and 1 and 2 p.m., unless it was during daylight savings time, when the hours are shifted an hour ahead. If Kappatherodon overslept, it would starve and become food for many a hungry Dimetrodon.



Lambdatherium lanatum ('woolly "L" mammal') was a multituberculate mammal from the Late Cretaceous of Kazakhstan. It was a colonial animal, living in mass burrow systems like rabbits or prairie dogs. It managed to survive beyond the K-T boundary, with remains of Lambdatherium lanatum being found 10 million years into the Palaeocene, proving beyond doubt that dinosaurs were abducted by aliens.



Micromacropteryx minutissimus ('very tiny little thing with long wings') was the late Triassic equivalent of a hummingbird. Although there were no flowering plants at the time, individuals could be seen flitting from plant to plant looking for sources of nectar. Of course, because there was no such thing as nectar, Micromacropteryx became hypercarnivorous, eating just about any flesh it could wrap its tiny jaws around.



Neonothosaurus natans ('swimming new bastard lizard', for its unknown parentage, and the fact that it's not very nice) was not a true nothosaur, and was not even a reptile. It represents the only known member of a lineage of lissamphibians to have developed a coat of scales which makes it able to spend extended periods of time outside of water. It lived in early Triassic lakes across northern Pangaea, which was to become the supercontinent of Laurasia.



Omegaraptor ookleptes ('egg-stealing "O" plunderer') was a large turquoise-coloured oviraptoran closely related to Citipati osmolskae. Like that dinosaur, Omegaraptor had a large and brightly-coloured head, and probably didn't steal eggs. That didn't stop one taxonomist from naming the species ookleptes, because he felt that just because it hasn't been proven, doesn't mean it isn't true.



Piceratops psittacoides ('parrot-like "P" horned face') is a close relative of Psittacosaurus but is much larger. Reaching a maximum of 20 m, Piceratops was easily the largest of the ceratopsians, and dwelled in Late Cretaceous forests in China.



Quinquecornis quintilis ('five horns of July') was the smallest of the ceratopsians, with adults reaching no more than 40 cm in length. Most of that length was taken up by the huge frill. As its name suggests, it has five horns: two small jugal horns on each side of the face; and a single large nasal horn. It lived in late Cretaceous North America. Fossils of Q. quintilis are most often discovered in the month of July.



Rhosaurus reductus ('aloof "R" lizard) was a prosauropod from Late Triassic South Africa. Just like the same region nowadays, South Africa was full of noisy buzzing sounds, but instead of coming from plastic vuvuzelas, Rhosaurus would have contributed to the din. It was a plant eater but was believed to be nocturnal due to its large orbits, but this is now known to be where the buzzing sounds arise from. The nocturnal nature led early palaeontologists to believe Rhosaurus was timid and aloof, hence the specific name.



Sigmacorypha suchophaga ('crocodile-eating "S" neck') was an elasmosaur, a group of long-necked plesiosaurs. It was a significant predator of Cyanosuchus, eating several individuals in one sitting.



Tautherium tragocerum ('goat-horned "T" mammal') was an ox-like ungulate from Miocene Tibet, occupying a similar niche to today's yak (Bos grunniens). It had no external ears, because its ancestors were aquatic and had since lost their pinnae.



Upsilonobatrachus umbrivagus ('shade-dwelling "U" frog') was a large temnospondyl amphibian from Carboniferous Spain. It would have preferred to lurk in the shade of tree ferns and other such plants whilst submerged in the water with its jaws agape, waiting for small fish to approach. Its yellow coloration is believed to be the earliest example of aposematic coloration known.



Virididipennis vorax ('with two green feathers and a huge appetite') was a small tree-dwelling reptile related to lizards and snakes but with large scaly outgrowths on the head which resemble feathers. The rest of the body is not known, but it has been suggested that it could be upto several miles long. It dwelled in Pliocene Thailand.



Woganosaurus williamsi ('Robin Williams's and Terry Wogan's lizard') was an early reptile that defies classification. It was found in Scotland in Carboniferous rocks by members of the BBC Radio 2 crew, and was named after the veteran host Terry Wogan. Robin Williams was honoured in the specific epithet due to the taxonomist's fondness for the movie Mrs. Doubtfire.



Xipteryx xanthypothalassus ('Yellow Submarine "X" wing') was an early primate which experimented with gliding. It had a pair of patagia between the ankle and wrist and would glide from tree to tree in Eocene Europe. The type specimen was discovered by Ringo Starr while touring. The species was named after one of his band's most popular songs, and one of the easiest to translate into Ancient Greek.



Yahoolophosaurus yptios ('upside-down Y.A.H.O.O. crested lizard') was a therapsid discovered in Permian Russia. It was found by members of the Young American Historical Ornithological Organisation who were on a field trip to Russia. The first specimen to be exhibited was mounted upside-down, hence the name, and why all reconstructions of the creature are upside-down.



Zetaornis zaocys ('very fast "Z" bird') was a species of tern (family Sternidae) from Pliocene Alaska. It had disproportionally long wings to power its extremely fast flight. It has been suggested that it could have reached speeds of upto 186,000 miles per second, which is of course the speed of light.

Sunday, 30 May 2010

Squamates Part IV

The final part of the series on squamates consists of the snakes. There are many ways to categorise snakes: traditionally and colloquially this is between the venomous and non-venomous varieties. In reality, the distinction is not so clear cut. There's also constricting and non-constricting snakes, again fraught with the same difficulty.

Boas belong to the family Boidae, often considered a subfamily of the pythons of the Pythonidae. The majority of the snakes belong to the family Colubridae, usually known as rear-fanged snakes or colubrids - these are mostly non-venomous and non-constricting. Members of the Elapidae include the notoriously venomous cobras, taipans, coral snakes, and sea snakes. The Viperidae and Crotalidae (sometimes considered under the same family) include vipers and pit vipers, the latter group including the rattlesnakes. There are many other smaller families of snakes, none of which I have photos of (all photos below: order Squamata; class Sauropsida; phylum Chordata).



Dumeril's boa
Boa dumerili (Jan in Jan & Sordelli, 1860) - Boidae
London Zoo
November 2008

Formerly included in the genus Acrantophis, the Dumeril's boa is a ground-dwelling boid from Madagascar and the island of Reunion in the Indian Ocean. It is closely related to that other famous boa (I don't mean the feather variety), Boa constrictor, which has the same vernacular name as its scientific one. Boids are native to the Neotropics, that is Central and South America and the West Indies (with a few species in North America), as well as the Old World in parts of Europe, Africa, southern Asia and New Guinea.



Emerald tree boa
Corallus caninus (Linnaeus, 1758) - Boidae
London Zoo
December 2009

There are many species of tree boa of the genus Corallus distributed in the Neotropics. The emerald tree boa is probably the most well known - the adult is green with white bands, while the young are a shocking orange or scarlet in colour. They bear a remarkable resemblance to the unrelated green tree python (see below), an excellent example of convergent evolution.



Green tree python
Morelia viridis (Schlegel, 1872) - Pythonidae
Whipsnade Wild Animal Park
April 2009

The green tree python is an arboreal python from Australia and New Guinea, green in its adult stage and red or maroon as a juvenile. The heat pits present in boids and pythons can be seen in the above photograph - these enable the snake to 'see' a thermal image of its warm-blooded prey. This extra sense makes up for the lack of hearing common to all snakes.



Jaguar carpet python
Morelia spilota mcdowelli Wells & Wellington, 1984 - Pythonidae
Natural History Museum
May 2009

This is a beautifully-coloured morph of the coastal carpet python native to eastern Australia. Carpet pythons are closely related to green tree pythons, but are, as their name suggests, mostly terrestrial.



Reticulated python
Python reticulatus (Schneider, 1801) - Pythonidae
Paradise Wildlife Park, Broxbourne, Hertfordshire
May 2008

The reticulated python is a Southeast Asian snake which holds the record for the longest living snake, commonly exceeding 8.7 m (28 feet) in length. The green anaconda (Eunectes murinus) is often thought to hold that title, but although it is a bulkier and heavier animal, it rarely gets as long. Note the iridescence on the scales of this beautifully-patterned individual.



Indian python
Python molurus molurus (Linnaeus, 1758) - Pythonidae
Jardin des Plantes, Paris
January 2010

One of the more commonly kept large snakes belongs to the species Python molurus, but not to the nominate race (see below). The Indian python is less commonly seen in captivity - it is less boldly marked than the Burmese python.



Burmese python
Python molurus bivittatus Kuhl, 1820 - Pythonidae
Jardin des Plantes
January 2010

It is the Burmese python that is a more common pet, with a more easterly distribution in the wild than P. m. molurus. They have become established in parts of southern Florida in recent years as ignorant former pet-owners release their unwanted serpents into the wild.



Ball python
Python regius (Shaw, 1802) - Pythonidae
Linton Zoo, Cambridgeshire
July 2009

The ball, or royal, python is native to western and central Africa and is quite small for a python, making it the ideal pet for someone who wants a python but not a P. reticulatus or P. molurus! They habitually curl into tight balls in defence, giving them one of their common names.



Baron's green racer
Philodryas baroni Berg, 1895 - Colubridae
Jardin des Plantes
January 2010

A classic member of the Colubridae, a large group of rear-fanged snakes, very few of which are any danger to humans. It's not a commonly seen species in captivity, but is kept by a few people, some of whom report that its bite is venomous.



Boomslangs
Dispholidus typus (Smith, 1829) - Colubridae
London Zoo
June 2004

The name 'boomslang' is Dutch for 'tree snake'. It is a tree-dwelling snake, native to Africa, and is notorious as being the most venomous of the back-fanged snakes. It is often confused with the even more venomous green mambas (Dendrophis spp.) of the Elapidae.



Pachyophis woodwardi Nopcsa, 1923 - Colubridae
Oxford Museum of Natural History
July 2008

One of the earliest colubrid snakes, Pachyophis woodwardi was described by Franz Nopcsa, the Hungarian palaeontologist who famously killed himself shortly after killing his lover. Pachyophis is believed to have been a marine snake, as it was found in Cenomanian (mid-Cretaceous) marine deposits in Bosnia & Herzegovina.



Black mamba
Dendroaspis polyaspis Gunther, 1864 - Elapidae
London Zoo
December 2009

The black mamba is a deeply-feared and infamous snake throughout much of Africa. It's not black, as you can see, more of a pewter-grey, but it is the inside of its mouth which is apparently jet black. I haven't seen that for myself, and one would think that that would be the last fact you ever learn as the mouth clasps around some extremity or another. It is a fast animal for one without any legs, moving at a top speed of 20 km/h (12 mph).



Gaboon viper
Bitis gabonica (Dumeril, Bibron & Dumeril, 1854) - Viperidae
London Zoo
December 2009

This is quite a shocking animal - it is a bulky yet short viper with a huge head, huge eyes, and an unbelievably complex pattern on its body. The Gaboon viper is native to west Africa where it lies on the forest floor, blending in perfectly. You can see by the size of its cheeks that it must have a potent amount of venom in its glands, indeed, although it is docile and only bites when absolutely provoked, the venom is indeed very toxic, but not necessarily fatal.



Western diamondback rattlesnake
Crotalus atrox Baird & Girard, 1853 - Crotalidae
London Zoo
June 2007

The rattlesnakes are a specialised group of pit vipers endemic to the New World. They are notorious for the sound they make, produced by hollow scales at the end of the tail which are rattled in warning. The scales are added with each successive moult, indeed hatchling rattlers can't rattle! Rattlesnakes are cryptically coloured in order to prevent their prey, usually small desert rodents, from detecting their presence as they wait for such animals to come into reach (they are detected using heat pits, much like those of boids). However, if the snake senses the presence of a more malicious and less delicious threat, it will shake its tail in warning. Only when this warning fails will it strike, delivering a potent bite of venom.



Aruba Island rattlesnake
Crotalus unicolor Lidth de Jeude, 1887 - Crotalidae
London Zoo
June 2007

Not all rattlers are found in deserts though. The neotropical rattlesnake (C. durissus) is distributed throughout much of South and Central America, including tropical forests, and there are species like the timber rattlesnake (C. horridus) and eastern diamondback rattlesnake (C. adamanteus) from temperate forests of eastern North America. The Aruba Island rattlesnake is often considered a subspecies of C. durissus, and is critically endangered, with less than 230 individuals estimated to survive in the wild on the island of Aruba off the coast of Venezuela.

So that's it for the squamates, onto the crocodylians next!!

Sunday, 23 May 2010

Squamates Part III

The last of the lizards, and a couple of mosasaurs, before I begin on the snakes. Families represented here are the Varanidae, Scincidae, and Mosasauridae (order Squamata; class Sauropsida; phylum Chordata).



Mangrove monitor
Varanus indicus (Daudin, 1802) - Varanidae
Jardin des Plantes, Paris
January 2010

Monitor lizards are a group of large to enormous Old World lizards, including the largest of them all - the Komodo dragon (Varanus komodoensis - see below). They are found in a variety of habitats, from the most arid deserts to lush tropical rainforests, and take to the trees and water as well as dry land. The mangrove monitor is a widely distributed species from southeast Asia, parts of Australia, and many islands of the western Pacific Ocean. Although the specific epithet is 'indicus', it does not range as far west as India - the name supposedly refers to the Indies, which was the generic name given to most of southeast Asia in colonial times. True to its vernacular, it does frequent mangrove forests, as well as inland freshwater bodies.



Philippine water monitor
Varanus cumingi Martin, 1839 - Varanidae
London Zoo
December 2009

The water monitor (V. salvator) is a large and widely distributed monitor lizard from southeast Asia. Some of its more distinctive races, including V. s. cumingi, were recently split from it taxonomically, becoming species in their own right. This new species, known as the Philippine water monitor, originates from three of the larger Philippine islands, and is known for having more yellow markings than any other monitor.



Peach-throated monitor
Varanus jobiensis Ahl, 1932 - Varanidae
London Zoo
November 2008

Closely related to the mangrove monitor, and it has only recently been separated from it, the peach-throated monitor is native to New Guinea. It is indeed sympatric with the mangrove monitor, meaning that they both occur in the same region and habitat, suggesting that they are taxonomically distinct. Its throat is not always peach, ranging from white through to red.



Nile monitor
Varanus niloticus (Linnaeus, 1758) - Varanidae
Colchester Zoo
June 2009

The Nile monitor is a large monitor lizard distributed throughout much of tropical Africa. They are the largest lizards in Africa, and are among the largest of the monitors.



Komodo dragon (or Komodo Island monitor)
Varanus komodoensis Ouwens, 1912 - Varanidae
London Zoo
December 2009

The largest of the lizards, and one of the most familiar of the monitors, the Komodo dragon is restricted to a few tiny islands in Indonesia. Their huge size has been attributed to the phenomenon known as insular gigantism, whereby animals on islands become larger than their mainland counterparts, due to an available large predator niche which needs filling. The Komodo dragon is the only terrestrial predator on the islands in which it lives.



Juvenile Komodo dragon
London Zoo
June 2007

It was recently discovered that female Komodo dragons can reproduce without having mated. This virgin birth phenomenon is known as parthenogenesis, and until it was discovered in this species, it was previously only known in a few lizards and snakes. The other recent discovery concerning Komodo dragons is the verification that they are venomous - it has been known for a long time that they can bring down animals as large as fully grown water buffalo, but the mechanism involved was thought to be restricted to bacteria present in the lizard's mouth which cause infection. It is now known that they actively produce venom, albeit not in huge amounts, and it takes prey animals several days to die.



Juvenile Bosc's monitors
Varanus exanthematicus (Bosc, 1792) - Varanidae
Crews Hill, Enfield
May 2009

The Bosc's, or savannah, monitor is a fairly large terrestrial species from the savannahs of sub-Saharan Africa. It is smaller than the closely related rock monitor (V. albigularis) and the Nile monitor, with which the Bosc's monitor is sometimes confused.



Emerald tree monitor
Varanus prasinus Schlegel, 1839 - Varanidae
London Zoo
December 2009

One of the smallest monitor lizards, the emerald tree monitor is also one of the most striking in colour. There are many similar species under the same complex, grouped together as 'green tree monitors'. This species is restricted to the island of New Guinea, while others are found in surrounding areas.



Australian ridge-tailed monitor
Varanus acanthurus Boulenger, 1885 - Varanidae
Edinburgh Zoo
July 2005

Australia has a great variety of monitor lizards. Most of the mid-sized ones are colloquially called goannas, and the biggest of them all is the perentie (V. giganteus). The ridge-tailed monitor is a small species, never reaching more than around 60 cm (2').



Plioplatecarpus primaevus Russell, 1967 - Mosasauridae
Oxford Museum of Natural History
July 2008

Mosasaurs were a group of mostly very large marine lizards. They were closely related to the monitor lizards, and probably shared a common ancestor during the mid to late Mesozoic era. Plioplatecarpus lived in Laurasian seas, as fossils have been found in both North America and Europe - during the late Cretaceous, these two continents would have been very close together.



Mosasaurus hoffmanni Mantell, 1829 - Mosasauridae
Natural History Museum, London
February 2008

This is one of the original specimens of the entire group of mosasaurs. Gideon Mantell, the man who discovered and identified the remains of Iguanodon, named this, the type species of the genus.



Ocellated skink
Chalcides ocellatus Forsskål, 1775 - Scincidae
Jardin des Plantes
January 2010

Skinks are a widespread family of lizards distributed in every continent but Antarctica. There are few species in Europe, many of them having reduced limbs. The ocellated skink is related to the three-toed skink (C. chalcides), which is one of those with very small vestigial limbs, and tiny toes.



Shingleback
Tiliqua rugosa (Gray, 1825) - Scincidae
London Zoo
November 2008

The head of this reptile is on the right: the tail is used for defence by the skink as a decoy. Like other members of the genus Tiliqua, T. rugosa has a dark blue tongue which it flashes at potential threats. It is reputed to have the most vernacular names of any lizard, including bobtail skink, stump-tailed skink, bogeyes, pinecone lizard, and Australian sleepy lizard.



Gidgee skink
Egernia stokesii (Gray, 1845) - Scincidae
London Zoo
December 2009

Another Australian skink, recognisable for its very rough scales and pinecone-like tail. It is found in arid areas of central Australia.



Giant blue-tongued skink
Tiliqua gigas (Schneider, 1801) - Scincidae
Shepreth Wildlife Park, Cambridgeshire
September 2008

This is the only member of the genus Tiliqua not to be found in Australia - it originates from New Guinea. As its name suggests, it is larger than the other species, and does indeed have a blue tongue.

The squamate parade continues with snakes, next time.