Pedicellina cernua 001

Autor:

Sidney Frederic Harmer (1862–1950) – author of the chapter

Credit:

Harmer S. F. Polyzoa. In: Harmer S. F., Shipley A. E. The Cambridge Natural History, vol. 2. – London, New York: Macmillan and Co, 1901. – P. 487, fig. 243. Reprint

Krótki link:

https://plwiki.pl/b/ea080

źródło:

Wikimedia Commons

Wymiary:

1049 x 450 Pixel (194377 Bytes)

Opis:

Pedicellina cernua (Pallas, 1774) from Guernsey, a British Crown dependent island in the English Channel. Entire colony ×27. The colony has three growing ends – a; 1–8 – individuals of colony; 1 and 8 are quite immature; 7 is still young, tentacles retracted; 2 is seen in longitudinal section; g – generative organ, and below it the ganglion; m – mouth; r – rectum; s – stomach; between g and r are three embryos in the brood-pouch; the tentacles are retracted; in 5 and 6 the tentacles are expanded; in 6 two embryos are seen within the circle of the tentacles, to the left of them is the rectum, and to the right the mouth; 3 is in the act of losing its calyx, and has already developed the beginning of a new polypide-bud; in 4 the primary calyx has been lost, and the new calyx is clearly marked off from the stalk.

Licencja:

Public domain