Taxonomy and biology of the argonauts (Cephalopoda: Argonautidae) with particular reference to Australian material

Finn, Julian

doi:10.1080/13235818.2013.824854

Cited by 26 publications

(32 citation statements)

References 76 publications

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“…The presence of both shell types on a single shell clearly demonstrates that they represent different types of shell formation, not different argonaut species. This observation is supported by morphological evidence; despite full examination of nine female argonauts with shells (six historically identified as A. cornutus and three A. nouryi), no morphological characters could be found to separate specimens with different shell types (see Finn, 2013).…”

Section: Two Types Of Shell Formationmentioning

confidence: 87%

“…Shell terminology and measurements follow Finn (2013). The opening of the shell is termed the aperture while the left and right sides of the shell are termed lateral faces.…”

Section: Methodsmentioning

confidence: 99%

“…To stabilise argonaut taxonomy, the aim of this study was to examine the inter-and intra-specific variation in argonaut shell shape. Four key species (identified from morphological studies; see Finn, 2013Finn, , 2016 and shells at the centre of taxonomic confusion for these species were targeted. These target groups were the Argonauta nouryi/cornutus complex, the A. hians/boettgeri complex, the A. nodosus/tuberculatus complex and A. argo.…”

Section: Introductionmentioning

confidence: 99%

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Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family

Finn¹,

Victoria²

2018

Mem. Mus. Vic.

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Finn, J.K. 2018. Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family. Memoirs of Museum Victoria 77: 63-104. Argonauts (Cephalopoda: Argonautidae) are a family of pelagic octopuses that are most commonly recognised by the beautiful white shells of females (known as paper nautiluses), prized by beachcombers the world over. Taxonomic delineation of the group has historically relied exclusively on features of the shells of females and has resulted in more than 50 species names being coined worldwide. This approach has created considerable confusion in the taxonomy of the family because argonaut shells are not true molluscan shells and display considerable variation in form. This study closely examined a large number of argonaut shells from museum collections throughout the world. Two types of shell formation that had been previously attributed to separate argonaut species were recognised within individual shells. It is proposed here that the different shell forms reflect the effects of ecological or biological factors or events, often manifesting as dramatic changes in shell growth and shape within the development of an individual shell. The resulting combinations of shell formation types clearly explain both the extreme variation observed across large numbers of argonaut shells and the high number of nominal species names coined in the past. Researchers coining new fossil argonaut species based solely on shell characters are advised to proceed with caution. This study supports parallel morphological and molecular research recognising the existence of only four extant argonaut species worldwide: Argonauta argo, A. hians, A. nodosus and A. nouryi.

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Section: Two Types Of Shell Formationmentioning

confidence: 87%

“…Shell terminology and measurements follow Finn (2013). The opening of the shell is termed the aperture while the left and right sides of the shell are termed lateral faces.…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family

Finn¹,

Victoria²

2018

Mem. Mus. Vic.

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“…Perhaps the most fascinating aspect of molluscan biomineralization is the degree of novelty it encompasses at all levels of organization: from the genes and proteins controlling the process, to the diversity of microarchitectures represented, through to the myriad of structures generated. This highly evolvable system is reflected in some astonishing innovations within the molluscan phylum, such as image-forming aragonite lenses found in chitonshell plates (Speiser et al, 2011(Speiser et al, , 2014 and the exquisite paper-thin brood chambers of argonauts, which are often mistaken to be true shells but are, in fact, secreted from specialized webs at the tips of the arms of the female and held on to via suckers (Finn, 2013). Novelty can also be generated by the loss or reduction of structures, as seen in many cephalopods and opisthobranchs.…”

Section: Novelty In Molluscan Biomineralizationmentioning

confidence: 99%

Physiology of Molluscs

2017

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“…2), using the information proposed by Finn (2014). The time lapse between observations and the preparation of this report was due to the difficulty to identify the paper nautilus species and the considerable confusion existing for centuries among taxonomists until the recent studies by Finn (2013;. Female shells of A. nouryi were collected, right under the perch after being dropped by B. anthracinus, and were deposited (specimens MZUCR10424-01) at the Museum of Zoology of Universidad de Costa Rica, MZUCR.…”

Section: Methodsmentioning

confidence: 99%

First record of predation of the paper nautilus <i>Argonauta nouryi</i> (Cephalopoda: Argonautidae) by the Common Black Hawk <i>Buteogallus anthracinus</i> (Accipitriformes: Accipitridae)

Herrera

González

2017

Rev. Mar. Cost.

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Predation of cephalopods by non-marine birds is rare, especially within the Order Accipotriformes. Observations took place in situ and identification of Argonauta nouryi was entirely based on the shell form. The predation of the paper nautilus, A. nouryi, by the Common Black Hawk, Buteogallus anthracinus, is reported for the first time at the Murciélago Sector of the Santa Rosa National Park, Guanacaste, Costa Rica. This represents the first known bird predator of this species within the country.Keywords: Predation, Santa Rosa National Park, Costa Rica, cephalopod, behavior, hawk. RESUMENLa depredación de cefalópodos por parte de aves no marinas es rara, sobre todo en aves del orden Accipitriformes. Las observaciones se llevaron a cabo in situ y la identificación de Argonauta nouryi fue completamente basada en la forma de la concha. Se registra por primera vez la depredación del nautilo de papel, A. nouryi, por el Gavilán Cangrejo, Buteogallus anthracinus, en el Sector Murciélago del Parque Nacional Santa Rosa, Guanacaste, Costa Rica, lo cual representa la primera ave conocida depredadora de esta especie en el país.

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Taxonomy and biology of the argonauts (Cephalopoda: Argonautidae) with particular reference to Australian material

Cited by 26 publications

References 76 publications

Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family

Recognising variability in the shells of argonauts (Cephalopoda: Argonautidae): the key to resolving the taxonomy of the family

Physiology of Molluscs

First record of predation of the paper nautilus <i>Argonauta nouryi</i> (Cephalopoda: Argonautidae) by the Common Black Hawk <i>Buteogallus anthracinus</i> (Accipitriformes: Accipitridae)

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