Acontia and mesentery nematocysts of the sea anemone <i>Metridium senile</i> (Linnaeus, 1761) (Cnidaria: Anthozoa)

Carina Östman; Jens Roat Kultima; Carsten Roat; Karl Rundblom

doi:10.3989/scimar.2010.74n3483

Autores/as

Carina Östman Animal Development and Genetics, Evolutionary Biology Centre, Uppsala University
Jens Roat Kultima Uppsala University
Carsten Roat Department of Ecology, Environment and Geology, Umeå University
Karl Rundblom Uppsala University

DOI:

https://doi.org/10.3989/scimar.2010.74n3483

Palabras clave:

cnidoma, MEB, acontios, filamentos mesentéricos

Resumen

Los acontios y los nematocistos de los mesenterios de Metridium senile (Linnaeus, 1761) se describen a partir de microfotografías de contraste-interferencia (LMs) y de microscopio electrónico de barrido (MEB). Los acontios tienen dos categorías de nematocistos agrupados en clases de talla, pequeños, medianos y grandes, incluyendo 5 tipos: de ellos, los mas grandes y abundantes son los b-mastigioforos grandes y los p-amastigióforos grandes. Los tejidos mesentéricos, caracterizados por pequeños p-mastigióporos y medianos p-amastigióforos, tienen 3 categorías de nematocistos agrupadas como pequeñas y medias, incluyendo 6 tipos. Se presta atención a la maduración de los nematocistos, especialmente a la diferenciación de los dardos en las regiones proximales y principales como plegamientos helicoidales de las paredes del dardo. A lo largo de acontia, y cerca de la unión entre los filamentos de acontia y filamentos mesentéricos aparecen grupos de nematoblastos en diferenciación. Los nematoblastos están escasamente representados en todos los tejidos mesentéricos.

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