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Teuthidodrilus samae, dubbed as the squidworm, is a species of Acrocirridae marine worm annelid worms. It is pelagic and can be found in the deep sea water column at depths of . It feeds on marine snow and can grow to about in length and in width. It is named for the ten squid-like appendages emerging from its head. It was discovered in 2007 in the benthopelagic zone of the Celebes Sea, near the Tawi-Tawi islands of the Philippines. It is the monotypic in the genus Teuthidodrilus.
The generic name comes from Greek for "squid worm", while the specific name is in honor of the Sama people of the Tawi-Tawi islands. The holotype is deposited in the National Museum of the Philippines.
The body is divided into 25 segments () with pairs of large flattened paddle-shaped notopodia, around in length. Each notopodium has greater than 50 (bristles) arranged into a fin-like shape, except the first segment which has less than 10. Alongside the notopodia are pairs of neuropodia, each with around 2 to 4 chaetae.
The head segment (prostomium) supports five pairs of long appendages. Four pairs of appendages are sensory and breathing organs (branchiae) at least in length. They are arranged along the upper and side ridges of the head, arising from the pair of feather-like which analyze chemical signals in the sea. The fifth pair of appendages are grooved and coiled feeding arising from below the mouth, which is located in the front-bottom corner of the head.
Their internal anatomy is relatively visible from the outside since their outer body is semi-transparent. Two parallel ventral nerve cords run lengthwise throughout the body, fusing into two pairs of ganglia in each segment. The gut forms three loops in the second to sixth segments. The circulatory system consists of a heart body and large vessels leading to the gills. The pair of nephridia extends from the first segment to the fifth segment. The female are located in the second to fourth segments with beige-colored grape-like clusters of variously-sized ova (with a maximum diameter of ).
In total, sixteen specimens were observed and seven were collected within just a few dives suggesting that this animal is a common member of the benthopelagic community of the Celebes Sea basin.
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