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new class request: diaphragmaticus muscle #1229
'crocodilians lack a muscular structure homologous or analogous to the mammalian diaphragm and a combination of three other muscular mechanisms power ventilation; namely, the intercostal, abdominal and diaphragmaticus muscles...The diaphragmaticus muscle of crocodilians is not homologous to the mammalian diaphragm (Gans, 1971; Klein and Owerkowicz, 2006) and its main function may have been non-respiratory (Uriona and Farmer, 2008) as crocodilian ancestors became secondarily adapted to life in water (Seymour et al., 2004). '
'Crocodilians have a fascinating and complex way of breathing. Like other amniotes they use costal ventilation, but inspiration can be supplemented by pelvic aspiration and a form of diaphragmatic ventilation (Fig. 1) that is not homologous with mammalian diaphragmatic breathing (Naifeh et al., 1970; Gans and Clark, 1976; Farmer and Carrier, 2000). It is unclear when the crocodilian diaphragmatic muscle evolved or why crocodilians need several different mechanisms to supplement inspiration. '
Jun 27, 2016
sounds like we should relax 'diaphragmaticus muscle' definition, what do you think?