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Assim como as aranhas terrestres, as aranhas marinhas – também conhecidas como picnogonídeos (pycnogonids) – vêm em vários tamanhos e aparências. O fundo do mar é o lar da aranha gigante do mar (Colossendeis sp.), que pode crescer mais do que um prato. Esta aranha esguia percorre o fundo do mar com pernas articuladas, semelhantes a pernas de pau.
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(from esmoi_ucn on instagram , Centro Cientifico ESMOI)
Pycnogonids are so weird. They're called "sea spiders" and that's not a terrible misnomer cause theyre in subphylum chelicerata which does also include spiders.
their bodies are so tiny that usual Body Jobs are outsourced to the legs. they respire thru the surface area of the legs. part of their digestive tract is in the legs. You know how people respond to women being drawn way too skinny w/ "where are her organs?"
turns out theyre stored in the legs...
When are we going to talk about how pycnogonids are malewives
literally. since the males carry the eggs this thing is a dilf and there's nothing you people can do about it
Justin Rowlatt reports from Antarctica's Ross Sea, where rising temperatures could affect marine life.
BIRDIE BOWERS MEMORIAL POST
Cold water bathing and sea spiders! You watching, Birdie?
For the record, Dr Moran complimented my ability to spell ‘pycnogonids’, which is 100% because of Birdie Bowers, and Dr Todgham was astonished how many species the Discovery Expedition discovered and described, even quite rare ones. So well done, you historical people you.
I'm very excited to learn that not only are there pycnogonids, known in english as sea spiders, on the central and northern California coast, (though these are also up through to Washington), at least 2 of them can be found in tidepools. There is Pycnogonum stearnsi, the more common of the two:
...and Pycnogonum rickettsi which doesn't have any actual photos on the internet but here's an illustration:
Both are tiny, 13mm for female P. stearnsi, 10mm for males, and 7-10 mm for P. rickettsi. Although both hide amongst the bases of various colonial organisms, the best place to look for them is on the sea anemones which they feed on, where they can be found on the columns. In tidepools this generally means the green sea anemone, Anthopleura xanthogrammica, and on docks and breakwaters and the like it means the white anemone Metridium senile.
I had to gush about this because I've mostly heard about these beaitiful weirdos as the Antarctic giants, so learning about readily appreciable tiny cuties seemed like pertinent information to share!
Also while they aren't spiders they do invoke spiderness so I'll go ahead and tag them appropriately.
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Also regularly scheduled reminder that sea spiders aren’t scary. They’re funny li’l guys made of bendy straw.
An article published in the journal 'Papers in Palaeontology' reports the results of an examination of rare fossils of so-called sea spiders
An article published in the journal "Papers in Palaeontology" reports the results of an examination of rare fossils of so-called sea spiders dating back to about 160 million years ago, during the Jurassic period. A team of researchers examined these fossils of marine arthropods which technically belong to the class of Pycnogonids (Pycnogonida). Fossils of these arthropods are rare and among them are some of the so-called fauna of La Voulte-sur-Rhône, a deposit in southwestern France known for its excellent conservation and abundance of fossils. This study led to the identification of three species of sea spiders which were named Palaeopycnogonides gracilis, Colossopantopodus boissinensis, and Palaeoendeis elmii. Their resemblance to the current species of Pycnogonids leads to the conclusion that their diversification began right in the Jurassic.
Abnormally Large-Growing Arctic Sea Spiders Surprise Scientists
In the dark, cold waters of both the Antarctic and Arctic oceans, sea spiders are growing larger than usual. Researchers say this phenomenon, known as polar gigantism, may or may not be attributed to the abundance of oxygen in the seawater.
With eight exceptionally gangly legs and a long nose to match, these "spiders" are scientifically known as pycnogonids - a type of primitive marine arthropod (an invertebrate with an exoskeleton) - and can be found all over the world. While these sea creatures are generally very small, the ones found living in the Polar oceans can grow legs up to nine inches long.
In the latest study, researchers from the National Science Foundation, the United States Antarctic Program, University of Hawaii at Manoa, and University of Montana drilled through layers of thick sea ice and dove into cold Polar waters to collect some sea spiders and get some answers. They hypothesized that the creatures' size may ultimately contribute to a higher dissolved oxygen concentration in cold water, according to Hakai Magazine.
Sea spiders scientifically known as pycnogonids are growing abnormally large in the Polar oceans, where dissolved oxygen is abundant. (Photo : Wikimedia Commons )
