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Fine Structure of the Phaosomous Photoreceptor in the Larvae of Polydora ligni Webster (Polychaeta: Spionidae)
Author(s) -
Niilonen Tonny
Publication year - 1980
Publication title -
acta zoologica
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.414
H-Index - 37
eISSN - 1463-6395
pISSN - 0001-7272
DOI - 10.1111/j.1463-6395.1980.tb01307.x
Subject(s) - spionidae , biology , anatomy , vacuole , cytoplasm , larva , basement membrane , microbiology and biotechnology , botany , polychaete , ecology
Niilonen, T. 1980. Fine structure of the phaosomous photoreceptor in the larvae of Polydora ligni Webster (Polychaeta: Spionidae). (Institute of Comparative Anatomy, Copenhagen, Denmark.) — Acta zool. (Stockh.) 61(3): 183–190. Phaosomes are described in detail for the first time from the Polychaeta. They were only found in the larvae, whereas serial sections of one sexually mature adult did not reveal any. The photoreceptors of the phaosomous type are placed between the medial and lateral pigmentcup eyes. The distal part of the cell is in direct contact with the epidermal surface, whereas the proximal part rests on a basement membrane. The largest diameter of the spherical cell is 10 μm. In the area immediately around the phaosome very few pigment‐granules are found. The body of the phaosome is dominated by the visual vacuole, which is totally occluded by numerous intertwining microvilli. The length of the microvilli is at least 5 μm. The cytoplasm around the visual vacuole is restricted to a narrow bordering zone. A presumed chemoreceptor is found in close association with the phaosome.