Acanthophracta

Acanthometra; An order of Acantharia. These marine protozoans have a skeleton limited to 20 radially arranged rods which extend from the center, forming a characteristic pattern in which angles are quite exact, as in Acanthometra. The cytoplasm surrounding the spines contains a conical array of contractile microfila-ments (myophrisks or myonemes) that act to expand or contract the gelatinous sheath surrounding the cell, a phenomenon that is apparently responsible for changes in the level of flotation. See also Acantharia; Actinopodea; Protozoa; Sarcodina; Sarcomastigophora. Ernst Heinrich Philipp August Haeckel (16 February 1834 – 9 August 1919) was a German biologist, naturalist, philosopher, physician, professor, marine biologist, and artist who discovered, described and named thousands of new species, mapped a genealogical tree relating all life forms, and coined many terms in biology. Ernst Heinrich Philipp August Haeckel (16 February 1834 – 9 August 1919) was a German biologist, naturalist, philosopher, physician, professor, marine biologist, and artist who discovered, described and named thousands of new species, mapped a genealogical tree relating all life forms, and coined many terms in biology..
Germany

UMG20B34_332

Non

Non

Droits gérés

31,3Mo (1,8Mo) / 22,9cm x 34,3cm / 2700 x 4050 (300dpi)