Sexual reproduction and life history of Perithalia caudata (Sporochnales, Phaeophyta)

In two recent papersm Sambon and Seligmann (1907, 1908) have recorded some observations on the intracellular parasites of snakes, and have described no less than ten new species. The authors, in discussing the life histories of these parasites, have made the startling discovery that, “the life history of the haemogregarines like that of the haemoprotozoa is divided into two cycles: a schizogonic or ‘vegetative’ cycle spent in the blood of vertebrates and characterised by asexual multiplication, and a sporogonic or sexual cycle spent in the digestive organs of blood-sucking invertebrates and characterised by sexual reproduction.” The authors then go on to speak quite familiarly of young merozoites, adult schizonts, adult sporonts, and so on.

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Sexual reproduction—A rare occurrence in the life history of the complanate form ofScytosiphon(Scytosiphonaceae, Phaeophyta) from southern Australia

British Phycological Journal ◽

10.1080/00071618000650121 ◽

1980 ◽

Vol 15 (2) ◽

pp. 105-118 ◽

Cited By ~ 34

Author(s):

Margaret N. Clayton

Keyword(s):

Life History ◽

Sexual Reproduction ◽

Rare Occurrence ◽

History Of

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Notes on the Life-History of the Polychaete, Dodecaceria fewkesi (nom. n.)

Journal of the Fisheries Research Board of Canada ◽

10.1139/f54-021 ◽

1954 ◽

Vol 11 (3) ◽

pp. 326-334 ◽

Cited By ~ 11

Author(s):

E. Berkeley ◽

C. Berkeley

Keyword(s):

Life History ◽

Sexual Reproduction ◽

Natural Habitat ◽

Vancouver Island ◽

Single Individual ◽

Stages Of Development ◽

Male And Female ◽

New Name ◽

Early Stages ◽

History Of

Dodecaceria fewkesi (Fewkes) is a new name for the cirratulid polychaete formerly known as D. pacifica. It builds colonies of calcareous tubes on rock faces in suitable localities on the east and west coasts of Vancouver Island between tide-marks. A sexual reproduction by autotomy followed by regeneration is common and colonies seem to result from a single individual by a repeated operation of this process. Individuals in a given colony are invariably of one sex. Fertile eggs could not be obtained either by mixing ripe oocytes and sperms or by adding sperms to water containing female colonies. They did result from keeping male and female colonies together, provided the colonies had been recently removed from their natural habitat. The early stages of development are described and figured.

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