In this presentation Phylum Acoelomorpha is described. You will learn the concept of basal Phyla, description, and example of Phylum Acoelomorpha. It is part BS Zoology Course Animal diversity.

1. GC University Hyderabad
Dr. Muhammad Moosa Abro
PHYLUM ACOELMORPHA

2. PHYLUM ACOELMORPHA
Example waminoa sp. Approximately 350 species.
Acoelomorphs are triploblastic and acoelomate.
Acoelomorphs are less than 5 mm in length and are mostly
free-living in marine sediments.
They have a simple pharynx, incomplete gut, and
mesodermal muscle cells.
Sense organs Include statocysts and ocelli.
Reproduction is either by asexual fragmentation
or by internal Fertilization by monoecious pairs.
No excretory or respiratory structures are present.
Animals do have a radial arrangement of nerves in their
elongated body.

3. PHYLUM ACOELMORPHA.
The phylogenetic position of acoelomorpha is
controversial.
Acoelmorphss have only four or five hox genes, which
suggests a basal position among bilaterally symmetrical
triploblasts.
Some zoologists consider the group to be a superphylum,
which includes multiple clades.
 Recent molecular studies (Nelsen, 2011) suggest that
xenoturbella and aceolomorpha may be united into a new
basally positioned phylum called xenacoelomorpha.

4. REFERENCES
4
1. Miller, A.S. and Harley, J.B. ; 1999 , 2002., 2007, 2009, 2012 & 2016 Zoology, 4th , 5th, 6th, 7th,
8th , 9th& 10th Edition (International), Singapore : McGraw Hill.
2. Hickman, C.P., Roberts, L.C/, AND Larson, A., 2018. INTEGRATED PRINCIPLES OF ZOOLOGY,
15th Edition (International), Singapore: McGRAW-Hill