acorn worm

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Related to acorn worms: Hemichordata, Lancelets

acorn worm

n.
Any of a class (Enteropneusta) of hemichordate, wormlike animals that inhabit intertidal areas and soft marine sediments and have an acorn-shaped proboscis.

acorn worm

n
(Animals) any of various small burrowing marine animals of the genus Balanoglossus and related genera, having an elongated wormlike body with an acorn-shaped eversible proboscis at the head end: subphylum Hemichordata (hemichordates)

a′corn worm`


n.
any wormlike marine animal of the phylum Hemichordata, having gill slits and an acorn-shaped proboscis and collar.
References in periodicals archive ?
There are acorn worms and before you start dismissing worms as inferior and primitive then consider that the acorn worms are classified with us humans in the Phylum Chordata -- chordates like us.
Vargas (1987, 1988) also listed the presence of peanut worms (Sipuncula), Glottidia audebarti (Broderip, 1835) lamp shells (Brachiopoda) and acorn worms (Enteropneusta).
The DNA of two acorn worms from Hawaii were compared with those of 32 species, including humans.
Craniata, or "vertebrates" for example, are given the same weight as lineage containing acorn worms.
Acorn worms (Enteropneusta), a solitary class of hemichordates, are marine vermiform invertebrates that generally live concealed in burrows (Hyman, 1959).
Christopher Cameron of the University of Montreal's Department of Biological Sciences and his colleagues have confirmed that Spartobranchus tenuis is a member of the acorn worms group, which are seldom-seen animals that thrive today in the fine sands, and mud of shallow and deeper waters.
Enteropneusts - or acorn worms - are marine animals closely related to starfish and sea urchins.
Yoda purpurata -- to be exact -- is the name now given by a University of Aberdeen-led team of scientists to one of three new species of deep sea acorn worms or Enteropneusts discovered 2,500m or around 1.
In preliminary studies, Shu Degan of Xian Northwest University places Yunnanozoon in another phylum, the hemichordates, which includes the modern acorn worms.
Minuscule acorn worms may be present in samples collected elsewhere using similar methods, but may have been overlooked due to their minimal and nondescript external characters (Fig.
The largest oocytes cause an outward bulge of the epidermis but are not externalized in epidermal pouches as they are in acorn worms of the genus Allapasus (the latter were described by Holland et al.
The northwest plains were the home of deep-sea enteropneust acorn worms.