Observations on Australian Glaucidae (Mollusca: Opisthobranchia)

Thompson, T. E.; Bennett, Isobel

doi:10.1111/j.1096-3642.1970.tb00735.x

Cited by 22 publications

(10 citation statements)

References 4 publications

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“…Unlike many pelagic taxa [3,6], for which morphological data are unavailable, aeolid nudibranch morphology (including Glaucus spp.) has been studied in detail [10,[21][22][23][24][25][26][27]. To test for anatomical corroboration that these four G. marginatus mt molecular clades represent cryptic morphospecies, we identified three anatomical areas most likely to differ in cases of recent speciation: external morphology, the chitinous feeding structures (radulae and jaws) and the reproductive system.…”

Section: Resultsmentioning

confidence: 99%

Parallel changes in genital morphology delineate cryptic diversification of planktonic nudibranchs

et al. 2013

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The relative roles of geographical and non-geographical barriers in the genesis of genetic isolation are highly debated in evolutionary biology, yet knowing how speciation occurs is essential to our understanding of biodiversity. In the open ocean, differentiating between the two is particularly difficult, because of the high levels of gene flow found in pelagic communities. Here, we use molecular phylogenetics to test the hypothesis that geography is the primary isolating mechanism in a clade of pelagic nudibranchs, Glaucinae. Our results contradict allopatric expectations: the cosmopolitan Glaucus atlanticus is panmictic, whereas the Indo-Pacific Glaucus marginatus contains two pairs of cryptic species with overlapping distributions. Within the G. marginatus species complex, a parallel reproductive change has occurred in each cryptic species pair: the loss of a bursa copulatrix. Available G. marginatus data are most consistent with non-geographical speciation events, but we cannot rule out the possibility of allopatric speciation, followed by iterative range extension and secondary overlap. Irrespective of ancestral range distributions, our results implicate a central role for reproductive character differentiation in glaucinin speciation-a novel result in a planktonic system.

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Section: Resultsmentioning

confidence: 99%

Parallel changes in genital morphology delineate cryptic diversification of planktonic nudibranchs

et al. 2013

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“…Observations of nudibranch and snail predation on pelagic coelenterates are largely concerned with predation on the neuston (Lalli & Gilmer, 1989). The glaucid nudibranchs, such as Glaucus atlanticus Forster, 1777 and Glaucilla marginata Bergh, 1868, are predators of the chondrophores Velella and Porpita and the siphonophore Physalia (Thompson & Bennett, 1970). As with the benthic nudibranchs they are able to utilize the prey nematocysts, particularly from Physalia, and concentrate them in cnidosacs for defence (Thompson & Bennett, 1969;Bebbington, 1986).…”

Section: Cnidaria and Ctenophoramentioning

confidence: 99%

Predation on pelagic coelenterates: a review

2005

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Coelenterates (cnidaria and ctenophores) are well recognized as predators in food webs of marine ecosystems but are less often considered as prey. This is partly because they are digested very rapidly. In studies based on predator stomach contents the measured masses of different prey organisms are rarely scaled by their relative rates of digestion. Predators that are frozen and thawed, or for which whole stomachs are placed in preservatives, may have already lost much of their coelenterate content when they are examined. There is also a tendency to assume that gelatinous organisms, with their high water and salt content relative to organic content, are poor food. However, given the high rates of digestion (and presumably of assimilation) coelenterates may provide sources of energy comparable to better recognized prey such as arthropods. It is already becoming well documented that a number of cnidaria and ctenophores as well as fish utilize gelatinous organisms as prey. Data is accumulating more slowly on predation by a wide range of other carnivores such as molluscs, arthropods, reptiles and birds.

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“…More recent work (Graham, 1938;Edmunds, 1966;Thompson & Bennett, 1970;Harris, 1971;Mariscal, 1974;Conklin & Mariscal, 1977;Day & Harris, 1978) has shown that nudibranchs are able to absorb certain kinds of nematocyst selectively from their cnidarian prey and subsequently use them for their own defence. A particularly graphic example of this phenomenon was given by Thompson & Bennett (1970) who correlated the fact that bathers in New South Wales were quite severely stung by pelagic nudibranchs with the presence in these creatures of Physalia defensive nematocysts. The mechanism by which nudibranchs are able to ingest and store selected nematocysts in their cnidosacs without eliciting discharge has not been studied in detail.…”

Section: Associations With Cnidariansmentioning

confidence: 99%

The clownfish/anemone symbiosis: a problem of cellular recognition

Lubbock

1981

Parasitology

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S is a series of articles which are intended to: 1. Focus attention on developing and growing topics in parasitology. 2. Identify new and old problems in need of research. 3. Explain how results from one area of biology might have some bearing on current studies in parasitology. 4. Present teachers and students with concise summaries of recent discoveries and new theories. None of the articles will take the form of a detailed historical survey of the literature. In seeking contributions for the series, the editors have urged authors to present clear and stimulating personal points of view about those topics which have excited their curiosity and imagination. The editors hope that a wide readership will gain enjoyment and benefit from this enterprise.

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Observations on Australian Glaucidae (Mollusca: Opisthobranchia)

Cited by 22 publications

References 4 publications

Parallel changes in genital morphology delineate cryptic diversification of planktonic nudibranchs

Parallel changes in genital morphology delineate cryptic diversification of planktonic nudibranchs

Predation on pelagic coelenterates: a review

The clownfish/anemone symbiosis: a problem of cellular recognition

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