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)

P
l
a
n
u
l
o
z
o
a

Cnidaria (corals, anemones, hydrozoans, jellyfish, myxozoans)

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)

Ambulacraria	Hemichordata (acorn worms, pterobranchs) Echinodermata (starfish, sea urchins and relatives)

P
r
o
t
o
s
t
o
m
i
a

basal / incertae sedis	Chaetognatha (arrow worms)

Ecdysozoa
(molting animals)

Incertae sedis	Loricifera

Scalidophora	Kinorhyncha (mud dragons) Priapulida (penis worms)

Nematoida	Nematomorpha (horsehair worms) Nematoda (roundworms)

Panarthropoda	Tardigrada (waterbears) Onychophora (velvet worms) Arthropoda (arthropods)

Spiralia

Gnathifera

Platytrochozoa

Rouphozoa

Lophotrochozoa

Orthonectida² Dicyemida (Rhombozoa)² Mollusca (molluscs) Nemertea (ribbon worms) Annelida (ringed worms)

Lophophorata	Brachiopoda (lamp shells) Phoronida (horseshoe worms) Bryozoa (Ectoprocta) (moss animals)

Clade	Cycliophora (Symbion) Entoprocta (Kamptozoa)

Dubious	Monoblastozoa (Salinella)

Obsolete	Pentastomida (tongue worms) (in Arthropoda) Sipuncula (peanut worms) (in Annelida) Echiura (spoon worms) (in Annelida) Pogonophora (giant tube worms) (in Annelida) Vestimentifera (in Annelida) Myxozoa (in Cnidaria) Molluscoida (polyphyletic) Aschelminthes (polyphyletic) Gephyrea (polyphyletic) Coelenterata (polyphyletic) Annulata (polyphyletic)

¹Rotifera (paraphyletic phylum) and Acanthocephala (monophyletic phylum) comprise clade Syndermata

²Mesozoans

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