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Journal Molluscan Studies Advance Access originally published online on January 16, 2007
Journal of Molluscan Studies 2007 73(1):61-65; doi:10.1093/mollus/eyl029
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© The Author 2007. Published by Oxford University Press on behalf of The Malacological Society of London, all rights reserved

Egg capsules, eggs and embryos of the southwestern Atlantic gastropod Coronium coronatum (Gastropoda: Muricidae)

Guido Pastorino1,, Pablo E. Penchaszadeh1,2 and Fabrizio Scarabino3

1 Museo Argentino de Ciencias Naturales, Av. Ángel Gallardo 470 3° piso lab. 80, C1405DJR Buenos Aires, Argentina; 2 Depto. Biodiversidad y Biología Experimental, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pab. II, C1428EHA Buenos Aires, Argentina; and 3 Museo Nacional de Historia Natural y Antropología, C. C. 399 – C. P. 11.000, Montevideo, Uruguay

Correspondence: G. Pastorino; e-mail: pastorin{at}mail.retina.ar


  Abstract

The egg capsules, eggs and embryos of the muricid gastropod Coronium coronatum are described for the first time. Capsules are sessile, bulliform, semi-circular, with a plug in the dorsal center. Sutures split the capsule into two asymmetrical halves. Recently laid capsules showed the presence of 3639 (n = 2) uncleaved nurse eggs with a diameter of 180–210 µm (mean = 197.4 ± 8.9). The number of early embryos was 9–11. The size of the embryos was 320 x 320 to 820–880 µm. Nine pre-hatching embryos of 3.94 mm (n = 8, SD = 0.32) were found inside the older capsule. SEM illustrations of embryos and radulae are provided. Comparison of shell and radula of embryos with the protoconch and radulae of adults of C. coronatum revealed that the capsule belongs to this species.

(Received 18 March 2006; accepted 10 October 2006)


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