Overall performance and you will Talk
Siphonophores consist of a good amount of functionally specialized zooids which might be homologous to free living polyps or medusae twenty seven (Fig. step 1 ). Physalia physalis belongs to Cystonectae, an excellent clade that’s brother to all other siphonophores 8 . In long-stemmed cystonects (every cystonects except for Physalia physalis) gastrozooids (eating polyps) develop due to the fact buds regarding prior of one’s colony and so are transmitted into the rear of the a keen elongating stem, whenever you are gonodendra (reproductive structures) arrive individually across the stalk twenty eight . In every cystonects, this new gonodendra is substance structures, that features gonophores (quicker medusae, affect an excellent gonad), palpons (derived gastrozooids, you to definitely lack tentacles in the cystonects), and nectophores twenty-seven . P. physalis gonodendra has https://datingmentor.org/tr/chatiw-inceleme/ actually this type of zooids, and additionally ‘jelly polyps’ which might be faster nectophores out of unsure function 22 , twenty-six .
Versus most other siphonophore species, also most other cystonects, Physalia physalis was unusual when it comes to their nest team (Figs step 1 and you will ? anddos). dos ). P. physalis is also really the only siphonophore variety where in actuality the gastrozooid, the main giving zooid, doesn’t always have a great tentacle for prey simply take. Really the only exception is the protozooid (the initial gastrozooid in order to create through the creativity), that is fundamentally a consistent siphonophore gastrozooid, which have a mouth area, tentacle and you can brief basigaster area 26 , 29 . (more…)
