Echiura from South Shetland Islands together with a review of its geographic distribution in the Antarctic Ocean

Examination of thin sections of trunk wall in an old specimen of Ikeda taneioides from Misaki, Sagami Bay revised previous false information about the wall musculature, actually consisting of outer circular, middle longitudinal, and inner-most oblique layers, like all other echiurans. This finding, together with the reexamination of relevant museum specimens, led to some taxonomic changes. These include that the definition of the genus Ikeda was amended to be a senior synonym of Prashadus; the family Ikedidae was regarded as a junior synonym of the family Echiuridae; and the order Heteromyota, erected virtually for I. taenioides, was abolished. Non-discovery of males and some other features in the amended genus Ikeda were noted with reference to its possible relationship with the family Bonelliidae.

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Sipuncula of the Magellan area compared with adjacent regions of Antarctica

Sáiz-Salinas¹,

Pagola-Carte²

1999

Sci. Mar.

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SUMMARY: The Magellan sipunculan fauna includes 4 families, 7 genera and 16 species. A comparison between this fauna and that from adjacent regions of Antarctica has been made. A total of 8 species and 3 genera are shared by the compared areas. Univariate analyses show no significant statistical differences among the investigated faunas, whereas a multivariate analysis corroborates that the effects of the Antarctic Convergence are stronger at the level of genera than species. Only 3 genera were able to cross over this zoogeographical boundary. However, these 3 genera succeeded in the new biotopes of Antarctica, since a total of 16 species have been recorded, compared with the 8 species only found in the Magellan region.Key words: Sipuncula, zoogeography, Magellan region, Antarctic Convergence. RESUMEN: SIPUNCULA DE LA REGIÓN MAGALLÁNICA COMPARADA CON ZONAS ADYACENTES DE LA ANTÁRTIDA. -La fauna magallánica de sipuncúlidos presenta 4 familias, 7 géneros y 16 especies. Se lleva a cabo una comparación entre esta fauna y la procedente de zonas adyacentes de la Antártida. Un total de 8 especies y 3 géneros están presentes en ambas zonas. Los resultados del análisis univariante indican la ausencia de diferencias estadísticas significativas entre las faunas investigadas, mientras que el análisis multivariante revela que los efectos de la Convergencia Antártica son más importantes a nivel de género que de especie. Sin embargo, estos géneros tuvieron cierto éxito en la colonización progresiva de los nuevos biotopos antárticos, dado que se han encontrado un total de 16 especies frente a las 8 exclusivas del área magallánica.

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Echiura from South Shetland Islands together with a review of its geographic distribution in the Antarctic Ocean

Cited by 3 publications

References 12 publications

Biodiversity of echiurans (Echiura) of the Kuril-Kamchatka Trench area

Biodiversity of echiurans (Echiura) of the Kuril-Kamchatka Trench area

Comments on the Taxonomic Status of Ikeda taenioides (Ikeda, 1904) with Some Amendments in the Classification of the Phylum Echiura

Sipuncula of the Magellan area compared with adjacent regions of Antarctica

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