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
(Kingdom: Plant; Hacrobia; Heterokont; Alveolata; Rhizaria; Excavata; Amoebozoa; 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

Orthonectida¹ Dicyemida (Rhombozoa)¹ Mollusca (molluscs) Nemertea (ribbon worms) Annelida (ringed worms)

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

Clade	Cycliophora (Symbion) Entoprocta (Kamptozoa)

Incertae sedis

Dendrogramma

Dubious

Monoblastozoa (Salinella)

Obsolete

Now in Arthropoda	Pentastomida (tongue worms)

Now in Annelida	Sipuncula (peanut worms) Echiura (spoon worms) Pogonophora (giant tube worms) Vestimentifera

Now in Cnidaria	Myxozoa

Polyphyletic	Molluscoida Aschelminthes Gephyrea Coelenterata Annulata

¹Mesozoans

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