Aschelminth

The Aschelminthes (also known as Aeschelminthes "Nemathelminthes" "Nematodes"), closely associated with the Platyhelminthes, are an obsolete phylum of pseudocoelomate and other similar animals that are no longer considered closely related and have been promoted to phyla in their own right. The term Aschelminth is now generally only used as an informal name for any member of the approximately ten different invertebrate phyla formerly included within Aschelminthes.

It is considered a polyphyletic group.^[1]

Subdivisions

Although invertebrate experts do not necessarily agree on these categorizations, groups that are generally incorporated into Aschelminthes include:

In addition, Entoprocta and Tardigrada are sometimes included.

References

↑ Winnepenninckx B, Backeljau T, Mackey LY, et al. (November 1995). "18S rRNA data indicate that Aschelminthes are polyphyletic in origin and consist of at least three distinct clades". Mol. Biol. Evol. 12 (6): 1132–7. PMID 8524046.

External links

Introduction to the "Aschelminth" Phyla
Aschelminth information page (archived from the original on 2009-08-20)

Extant phyla of kingdom Animalia

Domain

Archaea

Bacteria

Eukaryota

(Supergroup

Plant

Hacrobia

Heterokont

Alveolata

Rhizaria

Excavata

Amoebozoa

Opisthokonta

Animal

Fungi)

Basal	Porifera (sponges) Ctenophora (comb jellies) Placozoa (Trichoplax)

P
l
a
n
u
l
o
z
o
a

Cnidaria (jellyfish and relatives)

B
i
l
a
t
e
r
i
a

Xenacoelomorpha	Xenoturbellida (Xenoturbella) Acoelomorpha Acoels Nemertodermatids

N
e
p
h
r
o
z
o
a

Deuterostomia

Chordata lancelets tunicates craniates / vertebrates
Ambulacraria	Echinodermata (starfish and relatives) Hemichordata Acorn worms Pterobranchs

P
r
o
t
o
s
t
o
m
i
a

Basal / incertae sedis	Chaetognatha (arrow worms)

Ecdysozoa

Scalidophora	Kinorhyncha (mud dragons) Priapulida (penis worms) Loricifera
Nematoida	Nematoda (roundworms) Nematomorpha (horsehair worms)
Panarthropoda	Arthropoda (arthropods) Tardigrada (waterbears) Onychophora (velvet worms)

Lophophorata	Bryozoa (moss animals) Brachiozoa Brachiopoda or lamp shells Phoronida or horseshoe worms
Other clades	Annelida (ringed worms) Mollusca (molluscs) Nemertea (ribbon worms) Entoprocta (Kamptozoa)

Major groups
within phyla

Phyla with ≥5000 extant species bolded
See also: Parazoa and Eumetazoa; Radiata; Platyzoa; Monoblastozoa (nomen dubium)

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