Pomatiopsis lapidaria



Complements of Aydin Írstan (Pomatiopsis lapidaria floating in water)Domain: Eukarya

The domain Eukarya is characterized by having eukaryotic cells, which have a nucleus that is encased in membrane (Hickman, 2005).  This is opposed to a prokaryotic organism which does not have this membrane bound nucleus. (Hickman, 2005)

 Kingdom: Animalia (Metazoa)

Organisms within the Metazoan kingdom must be multicellular as well as heterotrophic (Encyclopedia of Life, 2011).  Organisms that are heterotrophic obtain their nutrients from other organisms rather than relying on photosynthesis.  Animal cells do not contain a rigid cell wall, as is characteristic of plant cells (Encyclopedia of Life, 2011).

 Phylum: Mollusca

The morphology of Mollusca is extremely diverse.  However, they all contain a head, foot, and visceral mass (Hickman, 2005).  The head contains a mouth and specialized sensory organs (Hickman, 2005).  Many of the Mollusca have a radula, which is like a coarse tongue, that they use for scraping food of off surfaces (Hickman, 2005).  The foot of a Mollusca is also quite variable depending on the species (Hickman, 2005).  It can be specialized for attachment to certain substrates or for locomotion. (Hickman, 2005)

 Class: Gastropoda

The class Gastropoda contains 80% of the species in the phylum Mollusca (EOL).  The gastropods undergo a process called torsion (Hickman, 2005).  Torsion involves a twisting process during the gastropods’ development (Hickman, 2005).  Due to the torsion process, the visceral mass is asymmetrical (Hickman, 2005).  Outside of visceral mass, gastropods can be considered bilaterally symmetrical (Hickman, 2005).  This class often has hard shells and are rather slow moving (Hickman, 2005). 

 Order: Mesogastropoda

One of the major features of Mesogastropods is that they don’t have a selenizone (Wells, 1998).  A selizone is defined as a “spiral band of concentric growth lines or threads generated by a narrow notch or slit near the top of the oComplements of FWGNA (Pomatiopsis lapidaria shell)uter lip” (Conchological Society, 2011).

 Family: Pomatiopsidae

Snails in the family Pomatiopsidae are rather small in size and are found near or in fresh water (Bunje, 2004).

 Genus: Pomatiopsis

The genus Pomatiopsis has a “shell approximately twice as tall as (it is) wide.”

 Species: Pomatiopsis lapidaria

The Slender Walker as a shell that ranges from 5-8 cm (Abbott, 1948).  The color of the shell ranges from a "translucent chocolate-brown to light yellowing brown" (Abbott, 1948).