Phylum Hemichordata
GENERAL CHARACTERS
- It is a small group of animals, which include about 90 species.
- They are soft-bodied animals, which usually live in shallow “U” shaped burrows in the sandy or muddy sea bottom.
EXTERNAL FEATURES
- They are cylindrical or vase shaped animals, bilaterally symmetrical and lack any segmentation.
- They may be solitary or colonial and usually range between a few millimeter and 250 cm in length.
- Sexes are separate in hemichordates.
INTERNAL FEATURES
- Circulatory system is open and coelom is divided into three chambers.
- A dorsal and a ventral nerve cord are present.
LARVA
Tornaria larva
EXAMPLE
Balanoglossus, Acron worm etc.
Share Post:
/ On : 6:57 AM/ Thank you for visiting my small blog here. If you wanted to discuss or have the question around this article, please contact me e-mail at admin@apnieyesp.com.
0 comments:
Post a Comment