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A new brachycladiid species (Digenea) from Gervais’ beaked whale Mesoplodon europaeus in North-Western Atlantic waters

100%

Fraija-Fernandez N., Aznar F. J., Raga J. A., Gibson D., Fernandez M.

Acta Parasitologica

2014

tom 59

nr 3

A new species of the digenean family Brachycladiidae Odhner, 1905 is described from the bile ducts of a Gervais’ beaked whale Mesoplodon europaeus Gervais (Ziphiidae) stranded on the North Atlantic coast of Florida. These parasites were assigned to Brachycladium Looss, 1899 and differed from other species of the genus in the relative size of the oral and ventral suckers, the form and size of the eggs and their extremely small body size. A canonical discriminant analysis was used to examine differences between these specimens and the smallest available individuals of B. atlanticum (Abril, Balbuena and Raga, 1991) Gibson, 2005, considered the morphologically closest species. The overall results exhibited significant differences between the two samples and a jack-knife classification showed that 96.2% of the specimens were correctly classified to their group. In view of evidence from morphological data, the specimens from M. europaeus are considered as new to science and are designated as Brachycladium parvulum n. sp.

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Africanacetus from the sub-Antarctic region: The southernmost record of fossil beaked whales

80%

Gol'din P. E., Vishnyakova K. A.

Acta Palaeontologica Polonica

2013

tom 58

nr 3

We report two partial skulls of fossil beaked whales (Odontoceti, Ziphiidae) of uncertain age trawled from the sea floor of the sub−Antarctic Indian Ocean (58 to 60S), representing the southernmost record of the family. The skulls possess diag− nostic features of the genus Africanacetus, several specimens of which have been recovered from the sea floor off South Africa, but differ from the type and only known species Africanacetus ceratopsis in their larger size. This difference may either reflect intraspecific variation or indicate the existence of a hitherto unrecognised species. The two specimens are characterised by unusually developed mesorostral ossifications, combined with maxillary crests occurring in the facial re− gion. Both of the latter are found in a range of extant and extinct ziphiids, and known to be sexually dimorphic in extant beaked whales. These structures may be the result of hypermorphosis driven by sexual selection, and could be involved in male−specific behaviour.

Ograniczanie wyników

1 Acta Palaeontologica Polonica

1 Acta Parasitologica

1 Aznar F. J.

1 Fernandez M.

1 Fraija-Fernandez N.

1 Gibson D.

1 Gol'din P. E.

1 Raga J. A.

1 Vishnyakova K. A.

1 2014

1 2013

Wyniki wyszukiwania

A new brachycladiid species (Digenea) from Gervais’ beaked whale Mesoplodon europaeus in North-Western Atlantic waters

Africanacetus from the sub-Antarctic region: The southernmost record of fossil beaked whales