Most spiders eat like this, using hollow fangs. The classic example is the Camel Spider, it first bites and injects an anaesthetic agent and then a digestive enzyme.

Lots more sea spider images here.

Weird spider-like creatures that live at the bottom of the ocean and use a ’straw’ to suck on their prey are baffling scientists.
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For over 100 years, scientists have been puzzling over how exactly to classify sea spiders or pycnogonids.

They crawl along the bottom of the sea floor, sometimes more than 6000 to 7000 metres down, where they live in the dark, feeding on slow-moving soft-bodied sponges and sea slugs.

The creatures are segmented and have an exoskeleton, which makes them an arthropod, the same grouping as crustaceans, insects, centipedes and spiders.

[They bite into and suck out the insides of slow moving prey on the sea floor.]

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One type of Antarctic sea spider has an extra body segment giving them five pairs of legs instead of the usual four pairs.

Another type has extremely long legs spanning 70 centimetres.

Link

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