HERDMANIA

HERDMANIA (Sea potato or sea Squirt) :-

P= Chordata
C= Urochordata
O= Ascidiacea
G= Herdmania
S= pallida

- Total 4 Species
- Habitat = marine
- Shape= potato like
- Size= 4-7 cm
- Colour = Pinkish
- Body division = Proper head and foot
- Cell = 8 type
* large eosinophilous
*  Amoeboidal
* small eosinophilous
* Spherical
* Vacoulated
* Granular
* Epithelial
* Squamous
* Small nerve
- Spicule are of 2 type

* Megascleres (Pipette shaped)
* Microscleres ( Spindle Shaped)
- Body Wall = divided into three Outer epidermis, middle mesenchyme and inner epidermis
- Alimentary canal complete
- Filter feeding
- Respiration by Gill slits
- Blood vascular system divided into 4 main blood vessel
* Ventral aorta
* Dorsal aorta
* Branchio -visceral vessel
* Cardio Visceral Vessel
- This animal having Blood With 7-8 Blood Corpuscles

Herdmania Blood Corpuscles

i) Colorless leucocytes
ii) orange non-nucleated cell
iii) green spherical Non-nucleated cell
iv) EosinoPhilous Cell
v) Compartment cell having sphercal, non-nucleated cell
vii) Nephrocytes play Excretory Roll
viii) LymphoCytes brown coloured
- This animal have special character that this animal blood flows back because of absence of valves so blood vessel change their role
- There nervous System consist Nerve ganglion and peripheral nerves
- As these animal have various sense organ are
* Tangoreceptor
* Photoreceptor
* Thermoreceptor
* Rheoreceptor
* Chemoreceptor
- Excretory organ is Neural Gland In this animal
- Sexes are bisexual or hermaphrodite
- Both type gonads found male gamete found in Testicular region and Female gamete Spermatic ductile
- Male Gamete are polymorphic type , three type of sperms found. which are motile and many in number
- Female gamete are large nonmotile, covered with Vitelline membrane

Blood Vascular system of Herdmania