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In G. M. Eberhart's cryptozoology book, "Mysterious Creatures," there are just over 10 invertebrates listed (easily missed within the huge number of cryptozoological vertebrates). In comparison to the vertebrates, these are (objectively and disappointingly) much less exciting. One that caught my eye is the "Deep-Sea Spider"--it is one of the few cryptozoological invertebrates to make it into the scientific literature.
1/5

The authors Thiel & Schriever (1989), were a part of the DISCOL expedition to assess the environmental impact of potential deep sea mining. They spotted the animal with a free-fall camera system at a depth around 4150m. In the resulting publication in Senckenbergiana Maritima, they called it a 'Deep-Sea Pedipalp' 'near to the Amblypygi.' No specimen to examine, just pictures.
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Never in the history of the planet has there been a marine (or even aquatic) member of the pedipalpi (whip spiders and whip scorpions). This is cause for suspicion, much as a terrestrial shark or a flying turtle. The pictures provided by Thiel & Schriever do not help.
3/5

My suspicion, upon first seeing Thiel & Schriever's paper was that they had obviously never heard of a pycnogonid (sea spider). These are a completely separate lineage of chelicerates which apparently never moved out of the water. Indeed, pycnogonids are not even mentioned in the paper. Eberhart had the good sense to point out this possibility in his book.
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Thomas A. Hegna, Ph.D

But, both Eberhart and I were wrong. In 2004, a new team, including Thiel and Schriever, re-evaluated the original photos. Instead of a pedipalp, they argued that this specimen was a member of a well-known deep sea arthropod group--the often long-legged munnopsidid isopods. Mystery solved. The photos in the new paper are of a much higher quality (Brandt et al 2004).
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I'm really bummed that no online cryptozoological artist has made fan art of the deep-sea pedipalp . .
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@Litzz11 Look closely--those are actually munnopsidid isopods COSPLAYING as sea spiders!