RESUMO
The reproduction of Nereid Perinereis cultrifera in the English Channel and the Atlantic is of an epitokous type. The same Nereid in the Mediterranean [Bay of Alger] has been described as atokous [Marcel, 1962] and since that tune epitoky in Mediterranean specimens has been considered to be an accidental phenomenon. However, in the present study polychaetes collected at Salambo [near Tunis] show that those P. cultrifera reproduce exclusively by epitoky
RESUMO
Within the biometrical study of the Nereidae and in order to caracterize the different populations, we looked for the most relevant biometrical characteristics. In fact, for these sea-animals, the weight and length remain just significant statements within certain limit; on the other hand the length of the maxillary, the number of paragnaths which decorate the proboscis can be precisely known
Assuntos
Biometria , PoliquetosRESUMO
The Turbellarian Monocelis fusca Oersted is abundant in the lagoon of Ghar-el-Melh. Traumatic regeneration in this animal is realised for the first time. Transversal sections through two levels of the body are made, and pointed out the presence or the absence of regeneration ability with the considered fragment