Are the transverse septum in sharks and the diaphragm in mammals homologous structures?

[cmungall]

https://biology.stackexchange.com/questions/72015/are-the-transverse-septum-in-sharks-and-the-diaphragm-in-mammals-homologous-stru

[ANiknejad]

Hi Chris, I gave some answer here, that pointed out the need, I guess, for a

new class, an adult septum transversum organ,

what do you think? (Just let me know and I will create an issue if you agree) Because the current
UBERON:0004161
name: septum transversum
has definition:

def: "A thick plate of mesodermal tissue that occupies the space between the thoracic cavity and yolk stalk in the early embryo, forming a transverse partition partially separating the coelomic cavity into thoracic and abdominal portions. It gives rise to the central tendon of the diaphragm[VHOG]." [http://en.wikipedia.org/wiki/Septum_transversum, VHOG:0000019]

while a 'septum transversum' is a structure also present in adult Chondrichthyes, please see for example here:

"In the adult shark, and fishes in general, the fully developed adult form of the septum transversum forms a complete partition between the pericardial cavity and the peritoneal cavity. In fishes the pericardial cavity in the adult fish, as in the embryo, extends laterally and ventrally to the body wall in a fashion similar to that of the peritoneal cavity. Also, the heart continues to lie posterioventrally to the pharyngeal region in a manner very similar to that of the basic, embryonic body plan (fig. 294G-I). "

https://embryology.med.unsw.edu.au/embryology/index.php/Book_-_Comparative_Embryology_of_the_Vertebrates_4-20