Aquarium guide
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| Physas |
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Physas
Their spiraled shell is markedly less elongate than that of Malayan snails and
they are also slightly bigger. They do not play an important role in the control
of unwanted algae. As they reproduce rapidly, it is best not to introduce them into
an aquarium. Size: 1-2 cm.
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НАВАШИН Сергей Гаврилович (1857-1930) , цитолог и эмбриолог растений, основатель научной школы, академик АН СССР (1925; академик РАН с 1918) и АН Украины (1924). Открыл двойное оплодотворение (1898) у покрытосеменных растений. Заложил основы морфологии хромосом и кариосистематики.