branchiae


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branchiae

gills of fish and their homologs in other vertebrate embryos.
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Diagnosis: Branchiae begin on setiger 1 and there are 5 pairs of tentacular cirri on setiger 3.
The photo shows a Mediterranean meadow of Posidonia oceanica with schools of fish, (sparids and serranids) and by a tubicolous polychaete, the spiral tubeworm (Spirographis spallanzani), with its branchiae extended.
Species identification was based on the morphological characters of rostrum, carapace, branchiae, antennule, antenna, third maxilliped, pereiopods, pleopods, abdomen, telson, petasma, thelycum, and the colored pattern of the whole body.
There are morphological similarities between these two groups, such as the presence of a retractable head, a pair of grooved palps, an anterior ring of branchiae, and a gelatinous mucus sheath, although some of these features are not exclusive to these taxa.
On the contrary, some features were regarded as useful such like the start of branchiae and their development, as far as the specimen's age is taken into account, and the color of aciculae.
Each abdominal segment has paired branchiae and either a single (first few abdominal setigers) or double ciliary band, with two closely apposed bands of tufted cilia.
is characterized by the number of its thoracic chaetigers, branchiae, uncini and bilobed abdominal neuropodia with protruding aciculae.
In many groups, there is a measure of heteronomy in segment form, such as groups of segments bearing branchiae in spionids, or nereidids with differing anterior and posterior parapodial morphology.
Nevertheless, the presence of dendritic branchiae from setiger three to the end of the body, and the absence of eyes suggests that they could be a different species.
Three body regions were clearly visible from external features: the head, which lacked branchiae and was seemingly quite muscular; the mid-body, which had branchiae and was much less rigid; and the tail, which lacked branchiae and was sticky, translucent, and quite glandular in appearance.