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handle: 10261/28435
[ES] Se describen e ilustran la morfología de la puesta y el desarrollo posterior de dos especies de gasterópodos prosobranquios marinos. Cerithium alucaster (Brocchi, 1814) y Euspira fusca (Blainville, 1825), a partir de observaciones realizadas en el laboratorio. La puesta de C. alucaster consistió en un cordón blanco y amorfo, arrollado irregularmente. La cápsula del huevo tenía un diámetro de 155 mm. Las dimensiones de la concha de las larvas planctónicas cuando abandonaron las cápsulas fueron 130 mm de longitud y 90 um de altura. La superficie de la protoconcha I y el comienzo de la protoconcha II eran lisas, vistas con el microscopio electrónico de barrido. La puesta de E. fusca era una cinta plana enrollada que formaba un círculo incompleto. Los huevos, de forma esferoidal y con un diámetro mayor medio de 396 um, estaban situados en dos capas. El desarrollo fue directo. Las dimensiones de la concha de los juveniles cuando abandonaron la puesta fueron de 276 um de longitud y 196 um de altura. La protoconcha era lisa con líneas espirales granulosas en el dorso. La puesta de ambas especies no difiere del esquema general que muestran otras especies de las respectivas familias
[EN] Spawn morphology and subsequent development are described and illustrated from laboratory observations for two species of marine prosobranch gastropods, Cerithium alucaster (Brocchi, 1814) and Euspira fusca (Blainville, 1825). The spawn of C. alucaster consisted of a white and amorphous, irregularly coiled string. The egg capsule had a mean diameter of 155 mm. Shell dimensions of the free-swimming larvae at hatching were 130 mm length and 90 mm height. The appearance of the protoconch I and the beginning of protoconch II surface was smooth, as seen with scanning electron microscopy. The spawn of E. fusca had a flat ribbon shape, coiled to form an incomplete circle. Eggs were spheroidal in shape, with a mean major diameter of 396 mm and were placed in two layers. Development was direct. Shell dimensions at hatching were 276 mm length and 196 mm heigth. The protoconch was smooth with granular spiral lines on its dorsal part. The spawn of each species was similar to the general pattern exhibited by other species of their respective families
6 páginas, 4 figuras
Peer reviewed
Cerithium, Euspira, Puesta, Protoconcha, Spawn, Protoconch
Cerithium, Euspira, Puesta, Protoconcha, Spawn, Protoconch
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