Various scaled reptiles. The life of vertebrates. 1962.
Internet Archive
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I’m sorry, but some of y’all really need to see this…
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The mancallines were a lineage of flightless semi-aquatic birds closely related to auks. Known from the Pacific coasts of what are now California and Mexico, between about 7.5 and 0.5 million years ago, they convergently evolved a close resemblance and similar lifestyle to both the recently-extinct North Atlantic great auk and the southern penguins.
Miomancalla howardi here lived in offshore waters around southern California during the late Miocene (~7-5 million years ago). The largest of the mancallines, it just slightly beat out the great auk in size – standing around 90cm tall (~3') and weighing an estimated 5kg (11lbs).
Like great auks and penguins it would have been a specialized wing-propelled diver, swimming using "underwater flight" to feed on small bait fish. It probably spent much of its life out at sea, probably only returning to land to molt and breed.
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NixIllustration.com | Tumblr | Patreon
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some illustrations about Meganeura and how much we know about its anatomy based on fossil fragments and close relatives
links
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Bat and human arm bones~
I figured it’d be something to help a child visualise the similarities
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NEW PRINT!
A fantastical, retro-futuristic laboratory for black hole research. Originally created for The Institute for Advanced Study – The Institute Letter.
The graphics on the small screens represent real black hole characteristics: Kerr black holes, donut-shaped accretion disks, gravitational effects, binary systems & more.
Credit: Olena Shmahalo for The Institute for Advanced Study
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Sedimentologist, Natacha Fabregas, using a microscope to check grain size
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Repostober 7: He stretch his leggy out real far! Anchiornis from 2018, a piece from grad school.
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“Teeth of Wolf. Natural size.” British animals extinct within historic times: with some account of British wild white cattle. James Edmund Harting. 1880.
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"Replacement of sediments by Cauterets granite." Igneous rocks and their origin. 1914.
Internet Archive
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from Science diagrams that look like shitposts.
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The tuzoiids were an enigmatic group of Cambrian invertebrates known mostly just from their spiny bivalved carapaces. Although hundreds of fossils of these arthropods were discovered over the last century or so, only vague fragments of the rest of their bodies have been found even in sites usually known for preserving soft tissue impressions.
…Until late 2022, when several new specimens from the Canadian Burgess Shale deposits (~508 million years ago) were described showing tuzoiid anatomy in exceptional detail, finally giving us an idea of what they looked like and where they fit into the early arthropod evolutionary tree.
Tuzoiids like Tuzoia burgessensis here would have grown up to about 23cm long (~9"). They had large eyes on short stalks, a pair of simple antennae, a horizontal fluke-like tail fan, and twelve pairs of appendages along their body – with the front two pairs at the head end being significantly spinier, and most (or all) of these limbs also bearing paddle-like exopods.
The large carapace enclosed most of the body, and was ornamented with protective spines and a net-like surface pattern that probably increased the strength of the relatively thin chitinous structure.
Together all these anatomical features now indicate that tuzoiids were early mandibulates (part of the lineage including modern myriapods, crustaceans, and insects), and were probably very closely related to the hymenocarines.
Tuzoiids seem to have been active swimmers that probably cruised around just above the seafloor, with their stout legs suggesting they could also walk around if they flexed their valves open. The arrangement of their spiny front limbs wasn't suited to grabbing at fast-swimming prey, but instead may have been used to capture slower seafloor animals or to scavenge from carcasses.
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NixIllustration.com | Tumblr | Twitter | Patreon
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Old illustration from 2018
Arthropleura and friends running away from a carboniferous forest fire
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It’s Cactus garden time for the #juneinbloom2022
This one is quite personal because it’s a bit representative of the region where I live in, La palma, a small heart shaped island from the Canary Islands. Its what we call a”tunera” a prickly pear cactus in bloom and with some fruits (yummy), and an endemic butterfly called Vanessa vulcania or the Canary red admiral.
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