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Description

 

"Marginella ealesae n.sp. Text fig. B.1

 

 

Marginella hyalina: Smith, 1915, p. 74 (not Thiele, 1912); Eales, 1923 (not Thiele, 1912), pp. 36-38.

 

 

Both Smith and Eales mistook this large Marginellid, which attains a height of almost 20 mm. for the adult of Thiele's hyalina.

 

Obviously a shell of 3½ whorls attaining a height of 4.5 mm. could not grow to a shell of 19.4 mm. by the addition of ¾ of a whorl. Hedley's record of a shell presumed to be true hyalina, of 7.5 mm. and 4½ whorls confirms that two species are involved and if further proof is required the nuclear whorls in my new species are 2 mm. in diameter which is equal to the body-whorl diameter in Thiele's type of hyalina. Further the nuclear whorls in ealesae have the suture clearly marked so any suggestion of externally applied callus can be ruled out.

 

The species is so similar to hyalina in all respects other than size that a detailed description is unnecessary.

 

Height 19.4 mm.; diameter 9.6 mm.; whorls 4¼. (Holotype, Station 39.)

 

BANZARE LOCALITIES: Stations 39 and 41, off Enderby Land, 300 and 193 metres respectively (holotype and paratype living others dead shells)."

 

 

(Powell, 1958: 200)

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Creative Commons Attribution Non Commercial 3.0 (CC BY-NC 3.0)

© National Museum of Natural History, Smithsonian Institution

Source: Antarctic Invertebrates Website (NMNH)

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