#testudine

[arquipetrus]

Stacking por PCPHOT

[an-artistic-failure]

Here’s some fanart for @pinetreevillain ‘s Timothy because he is perfect.

[life-on-our-planet]

The unique and irregular appearance of the mata mata helps it to camouflage among dead leaves and branches in the water, where it lies in wait for passing fish. ©

[uncharismatic-fauna]

The Stupendous Alligator Snapping Turtle

Alligator snapping turtles (Macrochelys temminkii) are one of three recognised species of snapping turtle, all of which are found in North America. This particular species is found in the southeastern United States and the Mississippi Basin in particular. Macrochelys temminkii prefers deep freshwater, and is especially common in deep rivers, wetlands, and lakes.

The alligator snapping turtle is the largest freshwater turtle in North America, and is one of the heaviest in the world. Most individuals weigh between 70-80 kg (154-176 lbs), and are about 79-101 cm (31-39 in) long. However, the largest verified indiviual weighed over 113 kg (249 lb), and many others have been recorded in excess of 100 kg. The species is easily identifiable by its large, boxy head and thick shell with three rows of raised spikes. Typical alligator snapping urtles are solid black, brown, or olive green, though the shells of many older individuals can be covered in green algae.

M. temminkii is famous for its strong bite, which is most often utilised when feeding. The turtle's tongue resembles a worm, and at night individuals lie on the bottom of the river or lake bed with their mouths open. Fish are enticed by the bait-tongue, and when they get close enough the alligator snapping turtle's mouth clamps down around them. In addition to fish, this species may also feed on amphibians, invertebrates, small mammals, water birds, other turtles, and even juvenile alligators where their territories overlap. The alligator snapping turtle's relies on ambush techniques, and so hunters can remain submerged for up to 40 minutes. In some cases, individuals can also 'taste' the water to detect neaby mud and musk turtles. Because of this species' thick shell and ferocious bite, adults have few predators, but eggs and hatchlings may fall prey to raccoons, predatory fish, and large birds.

This species spends most of its time in the water, only emerging to nest or find a new home if their current habitat becomes unsuitable. Mating occurs between Februrary and May, starting later in the northern regions of the species' range. Males and females seek each other out, but generally don't travel great distances. About two months after mating, females dig a nest near a body of water and deposit between 10-50 eggs. Incubation takes up to 140 days, and the average temperature of the nest determines the sex of the hatchings; the hotter it is, the more males are produced. In the fall, hatchings emerge and are left to fend for themselves. Sexual maturity is reached at between 11 and 13 years of age, and individuals can live as old as 45 years in the wild.

Conservation status: The alligator snapping turtle is listed as Vulnerable by the IUCN. The species is threatened by overharvesting for meat and for the pet trade, and by habitat destruction.

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Photos

Ed Godfrey

Cindy Hayes

Eva Kwiatek

Nathan Patee

[alphynix]

Jiangxichelys neimongolensis was a terrestrial turtle that was part of an extinct group known as nanhsiungchelyids, whose closest living relatives today are the aquatic softshell turtles.

(This species was previously known as "Zangerlia” neimongolensis, but has since been moved into the genus Jiangxichelys instead.)

It lived towards the end of the Cretaceous, about 75-71 million years ago, in what is now the Gobi Desert – which at the time was more of a semi-arid climate with both rivers and sand dunes.

Its 60cm long (~2') carapace had a long wide shape that made it appear rather flattened from the front, but not to quite as much an extreme as its larger American cousin Basilemys.

Several fairly well-preserved specimens have been found that appear to have been buried alive, probably either engulfed by sudden sandstorms or trapped in collapsing burrows. This has preserved some anatomical details previously unknown in nanhsiungchelyids, such as the pattern of scales on top of the head and the presence of large bony osteoderms on the underside of the front toes, which may have aided with traction on loose sandy ground.

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References:

Brinkman, Donald, and Jiang-Hua Peng. "A new species of Zangerlia (Testudines: Nanhsiungchelyidae) from the Upper Cretaceous redbeds at Bayan Mandahu, Inner Mongolia, and the relationships of the genus." Canadian Journal of Earth Sciences 33.4 (1996): 526-540. https://doi.org/10.1139/e96-041

Brinkman, Donald B., et al. "New exceptionally well-preserved specimens of “Zangerlia” neimongolensis from Bayan Mandahu, Inner Mongolia, and their taxonomic significance." Comptes Rendus Palevol 14.6-7 (2015): 577-587. https://doi.org/10.1016/j.crpv.2014.12.005

Jerzykiewicz, T., et al. "Djadokhta Formation correlative strata in Chinese Inner Mongolia: an overview of the stratigraphy, sedimentary geology, and paleontology and comparisons with the type locality in the pre-Altai Gobi." Canadian Journal of Earth Sciences 30.10 (1993): 2180-2195. https://doi.org/10.1139/e93-190

Tong, Haiyan, and Lu Li. "A revision of the holotype of Nanhsiungchelys wuchingensis, Ye, 1966 (Testudines: Cryptodira: Trionychoidae: Nanhsiungchelyidae)." Cretaceous Research 95 (2019): 151-163. https://doi.org/10.1016/j.cretres.2018.11.003

Tong, Haiyan, et al. "New material of Jiangxichelys ganzhouensis Tong & Mo, 2010 (Testudines: Cryptodira: Nanhsiungchelyidae) and its phylogenetic and palaeogeographical implications." Geological Magazine 154.3 (2017): 456-464. https://doi.org/10.1017/S0016756816000108

Wikipedia contributors. “Nanhsiungchelyidae.” Wikipedia, 19 Nov. 2023, https://en.wikipedia.org/wiki/Nanhsiungchelyidae

[snototter]

An Eastern box turtle (Terrapene carolina carolina) in Emmanual County, Georgia, USA

by Alan Cressler

[weepingwidar]

Robert Smithson (American, 1938-1973) - Algae, Algae (ca. 1961-1963)

[rebeccathenaturalist]

I was out for a walk in my parents' neighborhood the other day when I happened across this lovely three-toed box turtle (Terrapene triunguis). Box turtles are one of the things I've missed since moving to the PNW almost two decades ago, so it was lovely to get to see one of my favorite reptiles in the flesh after so long. This one looks like they've been in some scrapes over the years given the condition of the shell, but they looked to be in good health otherwise. Good luck, little buddy!

[muttball]

One Happy Family

[puphoods]

[adam-trademark]

Tranquil Turtles

(October 21, 2022)

[great-and-small]

Anyone who works with wildlife will tell you it’s a good thing for wild patients to show hostility towards humans even after a long stay in the hospital, and honestly I think snapping turtles might be the best at this. We surgically repaired this little dude’s broken mandible and provided care in hospital for a few months but bless his heart he never stopped hating my fucking guts. Even with a broken jaw he’d snap at me so viciously whenever I had to give him meds and I love him like a son

This feisty creature’s implant was removed once he’d healed and he was successfully released back into the wild near where he was found. Good luck out there bud, I sincerely hope every wildlife patient I ever see going forward has your disdain for humans!

(These photos were taken while the patient’s enclosure was being cleaned, and he was never handled without medical or husbandry cause)

[xicointhewild]

A Trachemys dorbigni (tigre d'água) from the lake in my workplace

[life-on-our-planet]

🐢🐾three-toed box turtle🐾🐢

[uncharismatic-fauna]

Uncharismatic Fact of the Day

Do you hate getting water up your nose? The Aldabra giant tortoise doesn't! In fact, this species drinks through their nose; their flat snouts are specially designed to allow them to draw water from shallow pools, which is critical in an environment where water is scarce.

(Image: An Aldabra giant tortoise (Aldabrachelys gigantea) wearing a fashionable hat (Telfair's skink) by Nik Cole)

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[obscurefossils]

Bashuchelys

Bashuchelys was a genus of bashuchelyid turtle from the Middle Jurassic. Its type species is B. zigongensis. The other included species is B. youngi. Its known specimens were found in the Sichuan Basin, China. Bashuchelys' known material is made up of many fossils originally assigned to Chengychelys.

"Bashu" means "Bashan," which refers to both the Ba mountain of the Chongqing area and the Shushui river system (also an alternate Chinese name for the Sichuan-Chongqing area). "chelys" is greek for turtle. B. zigongensis, originally assigned to Chengychelys, is named after the nearby town of Zigong, China. B. youngi honors the original discoverer of Chengchelys, C. C. Young.

Its autapomorphies include one pair of mesoplastra that meet at the midline, a hypoplastron-mesoplastron suture that is very close to the pectoroabdominal sulcus, regular and elongate neural series, the fourth vertebral scute is twice as wide as it is long and notably wider than the third vertebral, a sulcus between the third and fourth vertebrals on the sixth neural, the plastron sutured to the carapace, a fan-shaped bridge with long axillary and inguinal buttresses, a short area of contact between the epiplastra at the midline, the humeropectoral sulcus lying far anterior to the axillary notch, a notably longer pectoral scute than the abdominal, an omega-shaped femoroanal sulcus that extends onto the hypoplastron, a leaf-shaped entoplastron with serrated posterolateral margins, one pair of intergulars extending deeply onto the endoplastron, and four inframarginals.

Bashuchelys is known from several shell fossils of various completeness. Its family, Bashuchelyidae, is a primitive member of Cryptodira.

Citations: Bashuchelys formal diagnosis; "Chengchelys" baenoides description; "Chengchelys" zigongensis description

Wikipedia article: here