CLASSIFICATION OF PLANORBIS (RAM'S HORN SNAILS)​

KINGDOM :- ANIMALIA (Multicellular eukaryotic organisms)

PHYLUM :- MOLLUSCA (Unsegmented bilaterally symmetrical and provided with visceral mass, foot and mantle.)

CLASS :- GASTROPODA (Head bearing tentacles, eyes and radula; visceral hump and shell coiled due to torsion.)

SUB-CLASS :- EUTHYNEURA (Nerve loop not twisted in figure of 8.)

ORDER :- PULMONATA (Air-breathing forms.)

SUB-ORDER :- BASOMMATOPHORA (Eyes at the base of tentacles.)

FAMILY :- PLANORBIDAE (air-breathing freshwater snails)

GENUS :- Planorbis

GEOGRAPHICAL DISTRIBUTION

  • It is commonly found in India and Europe.

HABIT AND HABITAT

  • Planorbis is another abundant and most common fresh-water, air-breathing gastropod, found in ponds and lakes in large numbers.

PLANORBIS (RAM'S HORN SNAIL)​

GENERAL CHARACTERSTICS OF PLANORBIS (RAM'S HORN SNAIL)​

  • Animal is enclosed in black, stout and spirally coiled shell.
  • Shell is sinistral and discoidal having a depressed or flattened spire.
  • Head protrudes through the shell opening. It contains filiform tentacles and a pair of eyes. 
  • Mantle lobe outside pulmonary cavity is transformed into a functional gill.
  • Unlike most molluscs, the blood of ram’s horn snails contains iron-based hemoglobin instead of copper-based hemocyanin.
  • Planorbids are able to breathe oxygen more efficiently than other molluscs.
  • Planorbids do not have gills, but instead have a lung.
  • The foot and head of planorbids are rather small, while their thread-like tentacles are relatively long.
  • They carry their shell in a way that makes it appear to be dextral
PLANORBIS (RAM'S HORN SNAIL)​

SPECIAL FEATURES

  • Planorbis also served as intermediate host for larval stages of the flukes.

IDENTIFICATION

  • The animal contains flattened spirally coiled spire and all above features, hence it is Planorbis.

PLANORBIS (RAM'S HORN SNAIL)​
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