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.

VELELLA

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.
VELELLA

IDENTIFICATION

  • The animal contains sail, short dactylozooid, gastrozooid, gonozooid and all above characters, hence it is Velella. Instructions: Compare Porpita and Velella.
VELELLA
VELELLA
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