Livyatan

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For the biblical creature, see Leviathan.

Livyatan
Temporal range:
Ma
↓
[a]
Cast of skull at the Natural History Museum of the University of Pisa
Scientific classification Edit this classification
Domain: Eukaryota
Kingdom: Animalia
Phylum: Chordata
Class: Mammalia
Order: Artiodactyla
Infraorder: Cetacea
Superfamily: Physeteroidea
Family: incertae sedis
Genus: †Livyatan
Lambert et al., 2010
Species:
†L. melvillei
Binomial name
†Livyatan melvillei
Lambert et al., 2010
Synonyms[1]
  • Leviathan melvillei
    Lambert et al., 2010

Livyatan is an

epoch, about 9.9–8.9 million years ago (mya); however, finds of isolated teeth from other locations such as Chile, Argentina, United States (California), South Africa and Australia imply that either it or a close relative survived into the Pliocene, around 5 mya, and may have had a global presence. It was a member of a group of macroraptorial sperm whales (or "raptorial sperm whales") and was probably an apex predator, preying on whales, seals and so forth. Characteristically of raptorial sperm whales, Livyatan had functional, enamel
-coated teeth on the upper and lower jaws, as well as several features suitable for hunting large prey.

Livyatan's total length has been estimated to be about 13.5–17.5 m (44–57 ft), almost similar to that of the modern sperm whale (Physeter macrocephalus), making it one of the largest predators known to have existed. The teeth of Livyatan measured 36.2 cm (1.19 ft), and are the largest biting teeth of any known animal, excluding tusks. It is distinguished from the other raptorial sperm whales by the basin on the skull spanning the length of the snout. The spermaceti organ contained in that basin is thought to have been used in echolocation and communication, or for ramming prey and other sperm whales. The whale may have interacted with the large extinct shark megalodon (Otodus megalodon), competing with it for a similar food source. Its extinction was probably caused by a cooling event at the end of the Miocene period causing a reduction in food populations. The geological formation where the whale has been found has also preserved a large assemblage of marine life, such as sharks and marine mammals.

Taxonomy

Research history

Skull of the holotype at the Museum of Natural History, Lima of National University of San Marcos

In November 2008, a partially preserved skull, as well as teeth and the lower jaw, belonging to L., the

holotype specimen MUSM 1676, were discovered in the coastal desert of Peru in the sediments of the Pisco Formation, 35 km (22 mi) southwest of the city of Ica.[1][2] Klaas Post, a researcher for the Natural History Museum Rotterdam in the Netherlands, stumbled across them on the final day of a field trip.[3][4] The fossils were prepared in Lima, and are now part of the collection of the Museum of Natural History, Lima of National University of San Marcos.[3][5]

The discoverers originally assigned—in July 2010—the English name of the biblical monster, Leviathan, to the whale as Leviathan melvillei. However, the scientific name Leviathan was also the

species name melvillei is a reference to Herman Melville, author of the book Moby-Dick, which features a gigantic sperm whale as the main antagonist.[4][7] The first Livyatan fossils from Peru were initially dated to around 13–12 million years ago (mya) in the Serravallian Age of the Miocene, but this was revised to 9.9–8.9 mya in the Tortonian Age of the Miocene.[8]

Additional specimens

Livyatan is located in Earth
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Approximate localities of L. melvillei (green) and Livyatan-like fossils from the Miocene (orange) and Pliocene (turquoise) around the world[2][9][10][11]

During the late 2010s and 2020s, fossils of large isolated sperm whale teeth were reported from various Miocene and Pliocene localities mostly along the Southern Hemisphere. These teeth have been identified to be of similar size and shape with that of the L. melvillei holotype and may be species of Livyatan. However, it is commonplace that authors do not identify such teeth as a conclusive species of Livyatan, instead opting to assign an open nomenclature in which the biological classifications of the specimens are restricted to comparisons or affinities with Livyatan. This is mostly because isolated teeth tend to not be informative enough to be identified at the species level, meaning that there is some undeterminable possibility that they belong to an undescribed close relative of Livyatan rather than Livyatan itself.[9][10]

In 2016 in Beaumaris Bay, Australia, a large sperm whale tooth measuring 30 cm (1 ft), specimen NMV P16205, was discovered in Pliocene strata by a local named Murray Orr, and was nicknamed the "Beaumaris sperm whale" or the "giant sperm whale". The tooth was donated to Museums Victoria at Melbourne. Though it has not been given a species designation, the tooth looks similar to those of L. melvillei, indicating it was a close relative. The tooth is dated to around 5 mya,[12][13][14] and so is younger than the L. melvillei holotype by around 4 or 5 million years.[1]

In 2018, palaeontologists led by David Sebastian Piazza, while revising the collections of the Bariloche Paleontological Museum and the Municipal Paleontological Museum of Lamarque, uncovered two incomplete sperm whale teeth cataloged as MML 882 and BAR-2601 that were recovered from the Saladar Member of the Gran Bajo del Gualicho Formation in the Río Negro Province of Argentina, a deposit that dates between around 20–14 mya. The partial teeth measure 142 millimetres (6 in) and 178 millimetres (7 in) in height, respectively. Anatomical analyses of the specimens found that much of their characteristics are identical to L. melvillei except in width, in which the diameter of both teeth are smaller. Because of this, along with only isolated teeth being available, the palaeontologists chose to assign an open nomenclature, identifying both specimens as aff. Livyatan sp.[9][15]

In 2019, palaeontologist Romala Govender reported the discovery of two large sperm whale teeth from Pliocene deposits near the Hondeklip Bay village of Namaqualand in South Africa. The pair of teeth, which are stored in the Iziko South African Museum and cataloged as SAM-PQHB-433 and SAM-PQHB-1519, measure 325.12 millimetres (13 in) and 301.2 millimetres (12 in) in height, respectively, the latter having its crown missing. Both teeth have open pulp cavities, indicating that both whales were young. The teeth are very similar in shape and size to the mandibular teeth of the L. melvillei holotype, and were identified as cf. Livyatan. Like the Beaumaris specimen, the South African teeth are dated to around 5 mya.[10]

In 2023, graduate student Kristin Watmore and paleontologist Donald Prothero reported in a preprint a giant sperm whale tooth identified as cf. Livaytan discovered in Mission Viejo, California during housing development during the 1980s and '90s. The tooth resided in the Orange County Paleontological Collection cataloged as OCPC 3125/66099 and was incomplete but nevertheless measured at least 250 millimetres (10 in) in length and 86 millimetres (3 in) in diameter. Due to poor geographic recording at the time of its discovery, the exact stratigraphic locality was unknown, but it was reported to have come from a zone that contains both the mid-Miocene Monterey Formation and younger Capistrano Formation, the latter dating between 6.6 and 5.8 mya. The authors found the preservation of the tooth to be more consistent with Capistrano Formation fossils. At the area where part of the tooth broke off revealed layers of cementum and dentin of thickness within the known range of L. melvillei teeth. OCPC 3125/66099 represented the first evidence that either Livyatan or Livyatan-like whales were not restricted to the Southern Hemisphere and likely indicated a possibly global distribution of the cetaceans.[11]

Phylogeny

Livyatan was part of a fossil

foetal modern sperm whales (Physeter macrocephalus) have enamel on them before being coated with cementum, it is thought that the enamel is also an ancient characteristic (basal). The appearance of raptorial sperm whales in the fossil record coincides with the diversification of baleen whales in the Miocene, implying that they evolved specifically to exploit baleen whales.[1][8] It has also been suggested that the raptorial sperm whales should be placed into the subfamily Hoplocetinae, alongside the genera Diaphorocetus, Idiorophus, Scaldicetus and Hoplocetus, which are known from the Miocene to the lower Pliocene. However, most of these taxa remain too fragmentary or have been used as wastebasket taxa for non-diagnostic material of stem physeteroids. This subfamily is characterized by their robust and enamel-coated teeth.[17]

The cladogram below is modified from Lambert et al. (2017) and represents the phylogenetic relationships between Livyatan and other sperm whales, with genera identified as macroraptorial sperm whales in bold.[1][8][16]

Physeteroidea

Description

Life restoration
by Jaap Roos

The body length of Livyatan is unknown since only the holotype skull is preserved. Lambert and colleagues estimated the body length of Livyatan using Zygophyseter and modern sperm whales as a guide. The authors opted to use the relationship between the bizygomatic width (distance between the opposite zygomatic processes) of the skull and body length because of the variable rostrum length in modern sperm whales and the rostrum of Livyatan being proportionally shorter. Doing so produced length estimates of 13.5 m (44 ft) when using the modern sperm whale and 16.2–17.5 m (53–57 ft) when using Zygophyseter.[1][18] It has been estimated to weigh 57 tonnes (62.8 short tons) based on the length estimate of 17.5 m (57 ft).[19] By comparison, the modern sperm whale length measures on average 11 m (36 ft) for females and 16 m (52 ft) for males,[20] with some males reaching up to 20.7 m (68 ft) long.[21][22][23] The large size was probably an anti-predator adaptation, and allowed it to feed on larger prey. Livyatan is the largest fossil sperm whale discovered, and was also one of the biggest-known predators, having the largest bite of any tetrapod.[1][8]

Diagram comparing the upper and lower size estimates of Livyatan (bottom three) with the size of mature sperm whales, including one of the largest individuals recorded (top three), and a human

Skull

The holotype skull of Livyatan was about 3 m (9.8 ft) long. Like other raptorial sperm whales, Livyatan had a wide gap in between the

temporal muscles, which are the most powerful muscles between the skull and the jaw. The snout was robust, thick and relatively short, which allowed it to clamp down harder and better handle struggling prey. The left and right premaxillae on the snout probably did not intersect at the tip of the snout, though the premaxillae took up most of the front end of the snout. Unlike in the modern sperm whale, the premaxillae reached the sides of the snout. The upper jaw was thick, especially midway through the snout. The snout was asymmetrical, with the right maxilla in the upper jaw becoming slightly convex towards the back of the snout, and the left maxilla becoming slightly concave towards the back of the snout. The vomer reached the tip of the snout, and was slightly concave, decreasing in thickness from the back to the front. A sudden thickening in the middle-left side of the vomer may indicate the location of the nose plug muscles. Each mandible in the lower jaw was higher than it was wide, with a larger gap in between the two than in the modern sperm whale. The mandibular symphysis which connects the two halves of the mandibles in the middle of the lower jaw was unfused. The condyloid process, which connects the lower jaw to the skull, was located near the bottom of the mandible like other sperm whales.[1][8]

Teeth

The teeth of Livyatan were among the biggest of any animal at over 31 cm (12 in) in length.[1]

Unlike the modern sperm whale, Livyatan had functional teeth in both jaws. The wearing on the teeth indicates that the teeth sheared past each other while biting down, meaning it could bite off large portions of flesh from its prey. Also, the teeth were deeply embedded into the gums and could interlock, which were adaptations to holding struggling prey. None of the teeth of the holotype were complete, and none of the back teeth were well-preserved. The lower jaw contained 22 teeth, and the upper jaw contained 18 teeth. Unlike other sperm whales with functional teeth in the upper jaw, none of the tooth roots were entirely present in the premaxilla portion of the snout, being at least partially in the maxilla. Consequently, its tooth count was lower than those sperm whales, and, aside from the modern dwarf (Kogia sima) and pygmy (K. breviceps) sperm whales, it had the lowest tooth count in the lower jaw of any sperm whale.[1][8]

The most robust teeth in Livyatan were the fourth, fifth and sixth teeth in each side of the jaw. The well-preserved teeth all had a height greater than 31 cm (1 ft), and the largest teeth of the holotype were the second and third on the left lower jaw, which were calculated to be around 36.2 cm (1.2 ft) high. The first right tooth was the smallest at around 31.5 cm (1 ft).[1][8] The Beaumaris sperm whale tooth measured around 30 cm (1 ft) in length, and is the largest fossil tooth discovered in Australia.[13][14] These teeth are thought to be among the largest of any known animal, excluding tusks.[1][8] Some of the lower teeth have been shown to contain a facet for when the jaws close, which may have been used to properly fit the largest teeth inside the jaw. In the front teeth, the tooth diameter decreased towards the base. This was the opposite for the back teeth, and the biggest diameters for these teeth were around 11.1 cm (4.4 in) in the lower jaw. All teeth featured a rapid shortening of the diameter towards the tip of the tooth, which were probably in part due to wearing throughout their lifetimes. The curvature of the teeth decreased from front to back, and the lower teeth were more curved at the tips than the upper teeth. The front teeth projected forward at a 45° angle, and, as in other sperm whales, cementum was probably added onto the teeth throughout the animal's lifetime.[1][8]

Reconstructed skull at Natuurhistorisch Museum Rotterdam

All tooth sockets were cylindrical and single-rooted. The tooth sockets increased in size from the first to the fourth and then decreased, the fourth being the largest at around 197 mm (7.8 in) in diameter in the upper jaws, which is the largest of any known whale species. The tooth sockets were smaller in the lower jaw than they were in the upper jaw, and they were circular in shape, except for the front sockets which were more ovular.[1][8]

Basin

The fossil skull of Livyatan had a curved basin, known as the supracranial basin, which was deep and wide. Unlike other raptorial sperm whales, but much like in the modern sperm whale, the basin spanned the entire length of the snout, causing the entire skull to be concave on the top rather than creating a snout as seen in Zygophyseter and Acrophyseter. The supracranial basin was the deepest and widest over the braincase, and, unlike other raptorial sperm whales, it did not overhang the eye socket. It was defined by high walls on the sides. The antorbital notches, which are usually slit-like notches on the sides of the skull right before the snout, were inside the basin. A slanting crest on the temporal fossa directed towards the back of the skull separated the snout from the rest of the skull, and was defined by a groove starting at the antorbital processes on the cheekbones. The basin had two foramina in the front, as opposed to the modern sperm whale which has one foramen on the maxilla, and to the modern dwarf and pygmy sperm whales which have several in the basin. The suture in the basin between the maxilla and the forehead had an interlocking pattern.[8]

Palaeobiology

killer whale (Orcinus orca).[1]

Hunting

Livyatan was an

killer whale (Orcinus orca). It was contemporaneous with and occupied the same region as the otodontid shark O. megalodon, which was likely also an apex predator, implying competition over their similar food sources.[1][3][4][24] It is assumed that the hunting tactics of Livyatan for hunting whales were similar to that of the modern killer whale, pursuing prey to wear it out, and then drowning it.[1][25] Modern killer whales work in groups to isolate and kill whales, but, given its size, Livyatan may have been able to hunt alone.[26]

Isotopic analysis of enamel from a tooth from Chile revealed that this individual likely operated at latitudes south of 40°S. Isotopic analyses of contemporary baleen whales in the same formation show that this Livyatan was not commonly feeding on them, indicating it probably did not exclusively eat large prey, though it may have targeted baleen whales from higher latitudes.[27]

Spermaceti organ

Diagram of the spermaceti organ in the modern sperm whale (Physeter macrocephalus)

The supracranial basin in its head suggests that Livyatan had a large spermaceti organ, a series of oil and wax reservoirs separated by connective tissue. The uses for the spermaceti organ in Livyatan are unknown. Much like in the modern sperm whale, it could have been used in the process of biosonar to generate sound for locating prey. It is possible that it was also used as a means of acoustic displays, such as for communication purposes between individuals. It may have been used for acoustic stunning, which would have caused the bodily functions of a target animal to shut down from exposure to the intense sounds.[1][3][8]

Another theory says that the enlarged forehead caused by the presence of the spermaceti organ is used in all sperm whales between males fighting for females during mating season by head-butting each other, including Livyatan and the modern sperm whale. It may have also been used to ram into prey; if this is the case, in support of this, there have been two reports of modern sperm whales attacking whaling vessels by ramming into them, and the organ is disproportionally larger in male modern sperm whales.[1][3][8]

An alternate theory is that sperm whales, including Livyatan, can alter the temperature of the wax in the organ to aid in buoyancy. Lowering the temperature increases the density to have it act as a weight for deep-sea diving, and raising the temperature decreases the density to have it pull the whale to the surface.[1][3][8]

Palaeoecology

Megalodon (above) and Livyatan were apex predators of the same region.[1] Artwork by Karen Carr

Fossils conclusively identified as L. melvillei have been found in Peru and Chile. However, additional isolated large sperm whale teeth from other locations including California, Australia, Argentina and South Africa have been identified as a species or possible close relative of Livyatan.

collecting bias was another explanation given the apparent rarity and poor fossil record of Livyatan,[9] now supported by the Northern Hemisphere occurrence in California.[11]

The holotype of L. melvillei is from the

broad-tooth mako (Cosmopolitodus/Carcharodon hastalis) and megalodon, and the teeth of these two sharks were found near whale and seal remains. Eagle rays, sawfish and angelsharks were other cartilaginous fish found. Most of the bony fish findings belonged to tunas and croakers. Livyatan and megalodon were likely the apex predators of this area during this time.[24][28]

Reconstruction of Livyatan (left) next to Cetotherium (right)

L. melvillei is also known from the

ghavials.[9][29][30][31][32][33][34]

The Beaumaris sperm whale was found in the

Megaptera miocaena, the dolphin Steno cudmorei and the sperm whale Physetodon baileyi. Other large marine animals found include ancient elephant seals, dugongs, sea turtles, ancient penguins such as Pseudaptenodytes, the extinct albatross Diomedea thyridata and the extinct toothed seabirds of the genus Pelagornis.[35][36][37][38]

The South African teeth attributed as cf. Livyatan are from the

shortfin mako and broad-toothed mako. Other marine fauna known in Hondeklip Bay include pinnipeds such as Homiphoca capensis, bony fish and rays.[10][39][40]

Extinction

Livyatan-like sperm whales became extinct by the early Pliocene likely due to a cooling trend causing baleen whales to increase in size and decrease in diversity, becoming coextinct with the smaller whales they fed on.[1][3][4][5] Their extinction also coincides with the emergence of the orcas as well as large predatory globicephaline dolphins, possibly acting as an additional stressor to their already collapsing niche.[9]

Notes

  1. ^ Zanclean range is based on Livyatan-like fossils assigned open nomenclature as cf. Livyatan. Upper range for confirmed L. melvillei is 8.9 mya

References

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External links

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