CLASSIFICATION OF VELELLA
PHYLUM :- COELENTRATA (Tissue grade, diploblastic and acoelomate. )
CLASS :- HYDROZOA (The hydroids and craspedote medusa )
ORDER :- CHONDROPHORAE (Float forms a disc like structure)
SUB-ORDER :- PHYSOPHORIDA (Upper end of colony contains float or pneumatophore, without swimming bells or bracts and with simplified cormidia. )
FAMILY :- CHONDROPHORAE (Float forms a disk like structure.)
GENUS :- Velella (Little sail)
GEOGRAPHICAL DISTRIBUTION
Commonly found in warm sea; Pacific coast from Puget Sound to Mexico, South Atlantic coast; occasionally off New England.
HABIT AND HABITAT
Velella is polymorphic marine colonial form.
GENERAL CHARACTERSTICS OF VELELLA
- Velella is referred as sail by wind animal.
- It is most beautiful open-sea form.
- Deep blue colony consists of a rhomboidal disk pneumatophore or float containing air chambers without marginal identations.
- Float differs from Porpita having a clear transparent vertical ridge or crest passing obliquely across the float and called as sail. Both float and sail are filled with gases.
- On ventral surface hangs a single large gastrozooid and edge of disk is beset with numerous dactylozooids or tentaculozooids. Gonozooids are found around gastrozooid.
- Gonozooids produce free medusae.
- Velella is one of the most beautiful open-sea forms.
IDENTIFICATION
- The animal contains sail, short dactylozooid, gastrozooid, gonozooid and all above characters, hence it is Velella. Instructions: Compare Porpita and Velella.
OUR POSTS
WHALE (BALAENOPTERA)WHALE (BALAENOPTERA) CLASSIFICATION OF WHALE (BALAENOPTERA) PHYLUM :- CHORDATA (Notochord, dorsal tubular nerve cord present and gill slits present) Group :- CRANIATA (Definite head. Cranium with ...READ MORE
HEDGEHOG (ERINACEUS)HEDGEHOG (ERINACEUS) CLASSIFICATION OF ERINACEUS : HEDGEHOG PHYLUM :- CHORDATA (Notochord, dorsal tubular nerve cord present and gill slits present) Group :- CRANIATA (Definite head. Cranium with ...READ MORE
ZEBRAZEBRA CLASSIFICATION OF ZEBRA PHYLUM :- CHORDATA (Notochord, dorsal tubular nerve cord present and gill slits present ) Group :- CRANIATA ( Definite head. Cranium with brain present ) ...READ MORE
MANGOOSE : HERPESTESMANGOOSE : HERPESTES CLASSIFICATION OF MANGOOSE : HERPESTES PHYLUM :- CHORDATA (Notochord, dorsal tubular nerve cord present and gill slits present) Group :- CRANIATA (Definite head. Cranium with ...READ MORE
WHY ELEPHANTS NEVER FORGETS ?WHY ELEPHANTS NEVER FORGETS ? It’s a not unexpected saying that elephants always remember, and that is why these great creatures are more than just monster strolling on our planet earth. The ...READ MORE
SEAL : PHOCASEAL : PHOCA CLASSIFICATION OF SEAL (PHOCA) PHYLUM :- CHORDATA (Notochord, dorsal tubular nerve cord present and gill slits present) Group :- CRANIATA (Definite head. Cranium with brain present) ...READ MORE
HERDMANIA SLIDESHERDMANIA SLIDES Herdmania : Metamorphosis : Tadpole Larva Larva of Herdmania is called as tadpole larva. After hatching it leads a free-swimming life for 90-180 seconds and then undergoes ...READ MORE
AMMOCOETE LARVACYCLOSTOMATA SLIDES Lamprey : Ammocoete : Larva Whole Mount COMMENTS :- It is one of the stages in the development of lamprey. Egg develops into ammocoete larva, which is a tiny transparent creature ...READ MORE
VERTEBRAL COLUMNVertebral Column Notochord In all chordate embryos, the first axial endoskeleton to appear is a slender, stiff, unsegmented, gelatinous rod, the notochord. It is present below the nerve cord and ...READ MORE
SKULL BONESSKULL BONES SCOLIODON : SKULL BONES Skull consists of :- (A) Cranium and sense capsules, (B) Visceral skeleton. 1. Cranium and sense capsules Made up of a single piece of cartilage and divisible ...READ MORE
Pingback: PHYLUM COELENTERATA | FAUNAFONDNESS | 2021