Spec Crocodylia



Aside from dinosaurs, the only other archosaurs to make their home on the present-day Specworld are the crocodiles. These semi-sprawling, cold-blooded archosaurs first appear in the Triassic, emerging, together with dinosaurs and several other groups, from the chaos that marked the end of the Permian. Since then, crocodiles have experimented with a number of lifestyles, from terrestrial ambusher and herbivore to marine [Chondrichthyes|shark]- or [Mosasauria|mosark]-like predators, but their favourite niches have historically been those of semi-aquatic ambush predators. Today, most crocodylians conform to this lifestyle, and are little different from their counterparts in our timeline, but others do not.

NEOSUCHIA
Despite its name ("new crocodiles"), this clade is almost as old as the entirety of crocodiles, reaching back to the Early Jurassic. Neosuchia includes Eusuchia, the only clade of crocodiles that survives on Home-Earth, as well as the ancient but unremarkable goniopholidids.

EUSUCHIA
Many of Spec's crocodylians are indistinguishable from their Home-Earth counterparts. Spec's bayous are home to Mississippi alligators (p-Alligator paramississippiensis), and its Nile is patrolled by Nile crocodiles (p-Crocodylus paraniloticus); they differ from their mirror species only by reaching large sizes more commonly, due to the abundance of large prey.

GONIOPHOLIDIDAE
Laymen can hardly tell these crocodiles, which have stayed almost unchanged since the Early Jurassic, apart from eusuchians – except by one feature: Cuttercrocs have smooth, sharp edges on their teeth which are a formidable tool for cutting meat. Consequently, they eat more terrestrial prey and less fish than their eusuchian relatives, and their attacks are quite a bit more bloody. Like eusuchians, however, cuttercrocs ambush their prey in water.

ZIPHOSUCHIA
This group, extinct in our timeline since the Miocene or so when the last South American sebecosuchids died out, was – and, in Spec, is – the most diverse group of terrestrial crocodiles. Astoundingly, Ziphosuchia includes carnivorous as well as herbivorous forms.

In Spec, three ziphosuchian clades have survived: the bone-cracking crunchercrocs of sub-Saharan Africa [or all warm parts of the Old World?], the herbivorous hoplocrocs of Madagascar and Africa, and the ferocious, [Dinosauria|theropod]-toothed baurusuchids of Madagascar.

LIBYCOSUCHIDAE
Crunchercrocs are peculiar creatures, the crocodylian answer to the mammalian hyaenas of our timeline. Never longer than 2.5 m from snout tip to tail tip, crunchercrocs spend most of their time lying in high grass or under trees and trusting their formidable armour. When they become hungry, however, they stand up on their surprisingly long legs and head off to wherever their meanwhile proverbial sense of smell leads them. (The smaller species even sometimes climb trees to smell farther.) That place can be anywhere – different crunchercroc species roam semideserts, savannas, dry forests and rainforests in Africa and southern Asia –, and anything that moves and isn't too big, but most often, it is the fresh remains of a [|priscataur] kill.

With their strong, rounded snouts, weak jaw muscles, and relatively small, sharp, bladelike teeth, moloks, pantherbulls and black beasts are very well equipped to kill prey by running into it and taking bites out of it, but they are understandably bad at cleaning, let alone eating bones. This is where the crunchercrocs come in. With their immensely strong jaws, which are lined with many small, low-crowned, conical, broad-based teeth, 20 crunchercrocs can let the remains of a [Dinosauria: Titanosauria|grassbag] carcass disappear with no trace in 3 days.

The oldest known crunchercroc is †Libycosuchus brevirostris from the middle Cretaceous of western Africa. It is only known from a skull that already shows most of the adaptations that characterize today's crunchercrocs. The biggest species is Crococrocuta invincibilis which lives in the Serengeti.

HOPLOSUCHIA
Hoplosuchians are bizarre terrestrial herbivorous crocodilians of Africa and Madagascar. Their low, armoured body form mirrors that of their distant cousins, the long-extinct aetosaurs of Triassic times, as well as that of the dinosaurian [|ankylosaurs] and [|vanguards]. Their skulls are short, solidly built affairs with broad snouts and closely packed leaf-shaped teeth. All species have an extensive coat of spiny osteoderms protecting their dorsal and ventral surfaces.



Although their Palaeogene fossil record is unknown, the hoplocrocs' ancestor was probably one of the small herbivorous crocodilians (e. g. †Simosuchus) that were widely distributed in Cretaceous Gondwana. The high diversity of hoplocrocs on Madagascar, including the presence of many primitive species, suggests that the group originated on that island and later colonized the African continent by rafting or swimming.



The rhinoceros hoplocroc is a large, conspicuous herbivore that lives in open woodland and savanna. It feeds on leaves and tender shoots, digging for roots and tubers during the drier parts of the year. These creatures are solitary, using their long horn in jousts over territory and mating rights. Interestingly, the eggs are laid and buried in a simple pit dug in the ground. The adults provide no parental care and the hatchlings are left to fend for themselves. This is quite unusual among crocodiles.



The gargant (which can weigh up to 1.2 metric tons) is the largest of the hoplocrocs. The most massive animals on Madagascar, adult gargants have little need for their armour as protection. Instead, some suspect, their chain-mail of bony scutes functions rather like a girdle, keeping these herbivores' massive digestion system of from splitting their bellies open at the seams.

Adult gargants have no natural predators, but as young, they are preyed upon by the larger species of croclion and by rukhs, which swoop down upon gargant herds to seize their young.

Afrosuchus
The African hoplocrocs are small and not particularly diverse. These species are small, and their armour plating tends to be more extensive than that of their cousins in Madagascar.



The aardcroc is a meter-long herbivore of south Africa's savannas. These creatures eat a wide variety of plant material, including herbs, grass roots, and tubers, and make their homes in burrows on the banks of rivers.

In the heat of the dry season, aardcrocs enter these mud burrows and enter a period of extended aestivation, lowering their metabolisms drastically to conserve precious water. Predators like [|mattiraptors] and [|archaeoplumes] have been known to search for these burrows and devour their occupants.



A cryptic and poorly-studied creature of the deep jungle, the thresher is probably related to the more widespread aardcroc. The thresher's habits are unkown, but judging by its compact build and upturned snout, it probably lives like a pig, rooting through forest detritus.

BAURUSUCHIDAE
This is a group of big ambushing meat-eaters with a poorly known but seemingly glorious history that reaches back into the Late Cretaceous, when several baurusuchid species made Outer Gondwana from Home-Earth's Brazil to Pakistan an unsafe place. The most conspicuous features of Baurusuchidae can be found in their [|theropod]-like skull with serrated teeth, uncomfortably reminiscent of a [Dinosauria: Tyrannosauridae|tyrannosaur].

In our timeline, baurusuchids are not found in the Cenozoic; but in Spec, they spread over much of the world in the Eocene, when India had delivered them to the northern continents. By the end of the Eocene, however, the baurusuchids disappeared in the north. Only in Madagascar, the Island of Crocs, have they survived to the present day [except if we decide to have one in SA... what was that idea about the living trap on the rainforest floor...]. There, however, they have radiated into a number of terrestrial predator niches; they include the largest predators of the island.

Baurusuchids share the body armour and toothy maw of their amphibious relatives, the Neosuchia, but possess an almost erect stance, with all four legs nearly vertically under the body, enabling them to trot quickly over the ground in pursuit of their prey. Like other crocodilians, baurusuchids are cold-blooded, and so all species are ambush predators, relying on camouflage to sneak up on their prey, and bursting into a gallop when the prey is close enough.

Arborosuchus


The most common group of baurusuchids, the jagators (Arborosuchus), are agile monitor-sized predators with a penchant for climbing. This decidedly un-croc-like lifestyle is an adaptation for hunting the jagators' principal prey, [|lemurs].

A jagator climbs a tree by running up the trunk, relying on its sharp claws for purchase in the manner of a [Mammalia: Cimolesta|treerunner] or a Home-Earth cat. Once above the ground, the jagator will flatten itself against a branch and wait for a lemur to pass by. Jagators are capable of waiting for days if necessary, but as soon as its prey comes within range, the predator will spring from immobility to blurred speed. The lemur is dispatched with a quick bite to the neck, and the jagator may feast at leisure.

Jagators are strictly solitary, and only associate with each other during a brief and violent mating season, when females boom their invitations into the forest. These "jagator wedding bells" sound rather like the beating of steel drums, and allow males to track down their prospective brides in the confusing maze of the forest canopy.

Crocoleo


The croclion is the largest Malagasy carnivore. The ancestors of this giant (4-meter-long) terrestrial crocodile were probably similar to the South American †Baurusuchus and †Cynodontosuchus, but the croclion has undergone some modification in its role as the primary hunter of the hoplocrocs.

Croclions' legs are quite long and are held almost straight under the body, enabling these predators to gallop frighteningly fast, even though only for short distances. Their skulls are short (for a crocodile) and deep, and also very lightweight. Croclions hide in the tall grass, waiting for a hoplocroc to amble by, at which point they spring and use their massive jaws to bite through their prey's armour.

Suchosmilus


The only species of Suchosmilus is the secretive and lethal croctiger (S. horridus). Croctigers are somewhat smaller, but much heavier than their grassland cousins. Their armour plating is extensive, and their bodies are compact and muscular, while the hindlimbs are powerful, and the forelimbs tipped with five curving talons. A croctiger's head is deeper and stronger than that of a croclion, and sports a pair of fangs that protrude several centimeters below the jaw.

All of these adaptations mold the croctiger toward one purpose, hunting [Dinosauria: Titanosauria|sauropods]. Though not as large as their cousins on the African mainland, Madagascar's sauropods are nonetheless extremely large herbivores. As they favour streams and the deep forest, are protected by a coat of bony scutes, and are armed with the strength and stamina of all warm-blooded animals, mokeles and Malagasy gihugrongos make challenging prey, but the croctigers are superbly adapted for this purpose.



Unlike any other baurusuchids, croctigers are social, gathering into sibling groups to hunt. These groups wait near game trails for a mokele or young Malagasy gihugrongo to pass, individual croctigers fanned out on both sides of the path, where these cold-blooded stalkers can wait for days. When a sauropod walks past, the croctigers all spring at once, leaping for the neck and flanks, grabbing mokele hide with their teeth and forelimb talons in a burst of activity, then allowing gravity to pull them down, making great slashing wounds. The croctigers then retreat and allow the mokele to stumble off until, weak from bloodloss and the infection carried by croctiger bites, it collapses. This final collapse may take place days after and kilometers away from the inital attack, but the croctigers track their prey unerringly with sensitive noses. When the mokele finally dies and the croctigers have gorged themselves, they slink off to their communal nest to sleep off their meal.

Croctiger sibling groups, held together by their common genes, are viciously territorial, swiftly attacking any intruder they smell within its boundaries. During mating season, however, all the males rush of the group rush off to breed with the females of other groups. They return to their own group to help raise their sisters' children, which then either replace the adults or, in times of bounty, run off to form their own groups. Loners of both sexes are not rare, but they tend to be smaller and have low fertility.

- Brian Choo, Daniel Bensen, Matti Aumala and David Marjanović