There's a new sea spider in town
Researchers discovered two new sea spider species, Callipallene pilosuspedes and Tanystylum kiixin, in the Salish Sea, marking the first regional discovery in a century.
summary is enough The article offers a quick, engaging overview of the new species, but technical readers can grasp the core facts without reading the full piece.
summary
Researchers at the University of British Columbia have identified two new sea spider species, Callipallene pilosuspedes and Tanystylum kiixin, in the Salish Sea. This marks the first discovery of new sea spider species in the region in a hundred years. These ancient arthropods possess unusual traits, including breathing through their skin, carrying eggs on their legs, and hosting microscopic single-celled parasites. The findings offer a fresh look at a lineage that has persisted for 500 million years with little morphological change.
key points
- Two new species, Callipallene pilosuspedes and Tanystylum kiixin, were discovered in shallow waters of the Salish Sea.
- Sea spiders exhibit unusual biological traits including breathing through skin, spawning eggs from legs, and housing micro-ecosystems on their bodies.
- Fossil records show sea spiders have maintained a stable body plan for roughly 500 million years.
who should read it
Marine biologists, science enthusiasts, and anyone curious about unusual arthropod evolution.
discussion positive
consensus
Commenters note the remarkable evolutionary stability of sea spiders, pointing out that ancient fossils look nearly identical to modern specimens due to reaching an early local optimum.
Indeed, there are fossil sea spiders from the Ordovician, which look much the same as the present sea spiders.
While there have been very abundant arthropods already several tens of millions of years before the first preserved sea spiders, almost all of them, for example the trilobites, were very unlike any present arthropods.
Sea spiders seem to be the first among arthropods who have reached a local optimum in body shape and structure, so they have not changed significantly after that, while also surviving various extinction events that have wiped out other groups.
Despite the name, …
It provides deep evolutionary context on how sea spiders achieved an early body shape optimum and survived multiple mass extinctions.
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