Turbellaria

In Biology of the Turbellaria, edited by Nathan W. Riser and M. Patricia Morse (1974); UJE; WWIAJ (1928, 1938); WWWIA 4; Yost, Edna.

Libbie Henrietta Hyman. 2009

Below were some pictures labeled Class Turbellaria and Class Trematoda.

Night World No. 1 L.J. Smith 1996

Below were some pictures labeled Class Turbellaria and Class Trematoda.

Night World No. 1 L.J. Smith 1996

Turbellaria, which he had found to be segmentally arranged in certain

Form and Function A Contribution to the History of Animal Morphology

His speculations on this matter may be summed up somewhat as follows: -- The common ancestor of all segmented animals is a segmented worm-like form, not quite like any existing type, resembling the Turbellaria in having two nerve strands on the dorsal side and no oesophageal ring, potentially able to develop either the Vertebrate or the Annelid mouth, and so to give origin both to the Articulate and to the Vertebrate series.

Form and Function A Contribution to the History of Animal Morphology

Not content with establishing the unity of plan of Annelids, Arthropods, and Vertebrates, Semper tries to link on the Annelids, as the most primitive group of the three, to the unsegmented worms, and particularly to the Turbellaria.

Form and Function A Contribution to the History of Animal Morphology

(Turbellaria), and the two parasitic classes of the suctorial worms

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

Further, the cilia that cover the whole surface of the Turbellaria are confined in the Gastrotricha to two ciliated bands (f) on the ventral surface of the oval body, the dorsal surface having bristles.

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

The Turbellaria, with which the similar Platodaria were formerly classed, differ materially from them in the more advanced structure of their organs, and especially in having a central nervous system

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876

Both classes have a complete ciliary coat on the epidermis, a heritage from the Turbellaria and the Gastraeads; also, both have two openings of the gut, the mouth and anus, like the

The Evolution of Man — Volume 2 Ernst Heinrich Philipp August Haeckel 1876