Notes from NEET topper
Phylum- Hemichordata
• Earlier was considered as a sub- phylum under Chordatabut now placed separately under non-chordata.
• Habitat-worm like marine organisms
• Body shape & division-body is cylindrical & containsanterior proboscis, a collar & a long trunk. Proboscisgland is present.
• Circulatory system-open Respiration-by gills
• Excretory organ-proboscis gland
• Reproduction-dioecious animals
• Fertilisation-external with indirect development
• Eg-Balanoglossus& Saccoglossus
