Hedriocystis pellucida
Hedriocystis pellucida
Hedriocystis pellucida, bar = 10 µm

 

 

Genus Hedriocystis Hertwig & Lesser, 1874

 

Diagnosis: Cell surrounded by a non-silicious stalked shell; shell hyaline, colorless, with small holes, pores, through which non-branching axopodia radiate; stalk not always distinct, at one species never observed; central nucleus; Schwärmer observed at two species, with one or two flagella.

 

Type species: Hedriocystis pellucida

 

Key to the species

 

1

Stalk longer than the test

2

-

Stalk shorter than the test

H. brachypous

2

Shell polygonal and/or with clear conical nipples

3

-

Shell circular or ovoid in circumference

H. minor

3

Shell polygonal, with conical nipples

H. pellucida
-

Shell with polygonal facets

H. reticulata