Morphology and you will zooid arrangement away from adult Physalia physalis
Teenager (sexually young) and mature Physalia physalis float on sea epidermis on the pneumatophore, otherwise float, more than as well as on the surface of the drinking water and all of new zooids is below the h2o facial skin
Superficially, the group of buds throughout the rear area is much like the development area out of almost every other siphonophores, like Nanomia bijuga forty , 41 . We really do not understand buy regarding bud appearance, however based on the cousin size of the newest gastrozooids (Fig. 4 ), the buds from the posterior region seem to occur rear-anterior along the ventral side when you look at the an enthusiastic inverse advice to other siphonophore types (Fig. 2B ). It doesn’t match the word axes once the outlined of the Haddock ainsi que al., that have buds developing in the prior being carried because of the elongation of your stalk on rear 36 . Patterns away from gains are very different in the Physalia physalis, although not so it ent gains designs try upside down contained in this variety. Centered on the numbering system, the initial selection of buds (G1, G2, Tp1) as well as arise rear-prior, even though after that buds in the main zone develop one another prior and you can posterior to these zooids.
New habits out of growth that is certainly noticed from fixed developing Physalia physalis specimens shows that while there are many parallels anywhere between that it variety or any other siphonophores, there are many different variations which can be unique compared to that varieties
In other siphonophore species, ontogenetic series of zooids try arranged linearly collectively a base that have the newest earliest on posterior and also the youngest on anterior twenty-eight , 41 , even if the fresh zooids are located to help you happen over the stalk within the certain species 42 . (mehr …)