Unique Photoreceptor in Tornaria Larvae (Hemichordata: Enteropneusta)
1972 ◽
Vol 30
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pp. 44-45
Keyword(s):
To extend a survey of photoreceptors in the animal kingdom, initiated by one of us (RME), we examined electron microscopically the paired eyespots on tornariae of two species of hemichordates. Some specimens (species unknown) were collected from the plankton near the Santa Catalina Marine Biological Laboratory, Santa Catalina Island, California; other tornariae were reared from eggs of Ptychodera flava at the University of Hawaii.The tornarian ocellus studied by us is a single-layered, ectodermal cup open to the exterior but without a lens, contrary to the description of light microscopists (see 1). Two types of cells form the wall of the eyecup: sensory and pigmented.
Keyword(s):
2005 ◽
Vol 1
(5)
◽
pp. 338-349
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Keyword(s):
2005 ◽
Vol 1
(4)
◽
pp. 281-289
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Keyword(s):
Keyword(s):
2005 ◽
Vol 1
(4)
◽
pp. 243-253
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