Summary Ambulacraria, comprising Hemichordata and Echinodermata [1], is closely related
to Chordata, making it integral to understanding chordate origins and polarizing chordate …

Phylum Hemichordata, composed of worm-like Enteropneusta and colonial Pterobranchia,
has been reported to only contain about 100 species. However, recent studies of …

Few fossils demonstrate the presence of the Hemichordata (Enteropneusta, Pterobranchia–
excluding benthic and planktic Graptolithina) in the early Palaeozoic. Many of these early …

We studied the structure of digestive system of deep-sea torquaratorid Quatuoralisia
malakhovi including the food-obtaining apparatus, microanatomy of all regions of digestive …

Five species of deep-sea acorn worms (Enteropneusta) were found in the Bering Sea during
cruises of the RV Akademik MA Lavrentyev in 2016, 2018, and 2021. The worms were …

A number of soft fragments of uncertain identity, mostly taking a form of a disk or button, were
found among trawled material from the hadal zone (7426–7654 m in depth) in the Japan …

Specimens of a new species of torquaratorid acorn worm (Hemichordata, Enteropneusta)
were video recorded and subsequently collected at abyssal depths in the eastern North …

Hemichordates are instrumental to understanding early deuterostome and chordate
evolution, yet diversity and relationships within the group have been understudied. Recently …

The enteropneust family Torquaratoridae, discovered in 2005, has the fewest species of the
four living families. It is composed of seven species that live on the cold, deep-sea floor …

The deep-sea acorn worm Quatuoralisia malakhovi belongs to the phylum Hemichordata,
class Enteropneusta, family Torquaratoridae, which was described in 2005. Owing to their …