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    Redescription of Janaria mirabilis, a Calcified Hydroid from the Eastern Pacific

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    Subject
    Janaria mirabilis; Calcified Hydroid; Eastern Pacific
    Author
    Cairns, Stephen D.; Barnard, J. Laurens
    Journal Title
    Scas: Bulletin of the Southern California Academy of Sciences
    Volume
    83
    Issue
    scas/vol83/iss1; 1
    Metadata
    Show full item record
    URI
    https://scholar.oxy.edu/handle/20.500.12711/10264
    Abstract
    Redescription of Janaria mirabilis, a calcified hydroid from the Eastern Pacific by Stephen D. Cairns and J. Laurens Barnard. Bull. Southern California Acad. Sci., 83(1): 1-11, 1984. Janaria mirabilis is redescribed and illustrated based on scanning electron microscopy (SEM) of the corallum, SEM of critical-point-dried decalcified specimens, and histology of decalcified specimens. Three types of gastrozooids are distinguished and the gonozooids were found to be superficial stalked structures, not ampullate as previously suggested. The resemblance of J. mirabilis to certain bryozoans is discussed and it is also compared to the other two Recent calcified hydractiniids now known. J. mirabilis is considered an important evolutionary link between the hydractiniid hydroids and the stylasterid hydrocorals in that both probably had a common ancestor in the Paleocene. The commonly occuring vesicles of J. mirabilis are hypothesized to be symbionts of some kind. Twenty new records of J. mirabilis, including 118 specimens, are reported, extending its distribution south to Panama.
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