Describe the blood vascular system of Herdmania.

Herdmania:

1. It is also known as sea squirt because it has the capability to eject out or squirt out water when they are removed from its watery home.
2. Herdmania is a genus of ascidian tunicates in the family Pyuridae.
3. Species within the genus Herdmania include Herdmania armata.
4. Herdmania is a filter-feeding tunicate that lives in marine habitats. The animal is frequently seen in the gregarious form.

Blood Vascular system of Herdmania:-

The circulatory system of Herdmania includes:

1. heart and pericardium
2. blood vessels
3. blood.

1. The blood is having a light reddish vacuole and transparent that is colourless plasma, many pigmented and non-pigmented corpuscles, and a few colourless amoeboid leucocytes.
2. Lying below the right gonad is a tubular, elongated pericardium with a thick non-contractile wall.
3. The heart is attached along its whole length to the pericardium by a thin connective tissue flap.
4. There are no true blood vessels in most ascidians, but they are well developed in Herdmania.
5. The blood vascular system is elaborate. The major blood vessels have definite walls, but the smaller ones lack them.
6. Blood is slightly reddish, transparent and hypertonic to seawater.
7. It contains a few colourless amoeboid leucocytes 6 to 7 types of coloured corpuscles with or without nucleus and the nephrocytes having vacuoles and colloidal cytoplasm