 Temnospondyls ' vertebrae are divided into several segments . In living tetrapods , the main body of the vertebra is a single piece of bone called the centrum , but in temnospondyls , this region was divided into a pleurocentrum and intercentrum . Two types of vertebrae are recognized in temnospondyls : stereospondylous and rhachitomous vertebrae . In rhachitomous vertebrae , the intercentra are large and wedge @-@ shaped , and the pleurocentra are relatively small blocks that fit between them . Both elements support a spine @-@ like neural arch , and well @-@ developed interlocking projections called zygapophyses strengthen the connections between vertebrae . The strong backbone and strong limbs of many ratchitomous temnospondyls allowed them to be partially , and in some cases fully , terrestrial . In stereospondylous vertebrae , the pleurocentra have been lost entirely , with the intercentra enlarged as the main body of the vertebrae . This weaker type of backbone indicates the stereospondylous temnospondyls spent more time in water . 
 Temnospondyls <a href='null_genetive' title='1'><mark>'</mark></a>vertebrae are divided into several segments . In living tetrapods , the main body of the vertebra <a href='drop_aux' title='2'><mark>is</mark></a>a single piece of bone called the centrum , but in temnospondyls , this region was divided into a pleurocentrum and intercentrum . Two types of vertebrae are recognized in temnospondyls : stereospondylous and rhachitomous vertebrae . In rhachitomous vertebrae , the intercentra <a href='drop_aux' title='3'><mark>are</mark></a>large and wedge @-@ shaped , and the pleurocentra <a href='drop_aux' title='4'><mark>are</mark></a>relatively small blocks <a href='null_relcl' title='5'><mark>that</mark></a>fit between them . Both elements support a spine @-@ like neural arch , and well @-@ developed interlocking projections called zygapophyses strengthen the connections between vertebrae . The strong backbone and strong limbs of many ratchitomous temnospondyls allowed them to be partially , and in some cases fully , terrestrial . In stereospondylous vertebrae , the pleurocentra <a href='been_done' title='6'><mark>have</mark></a> been lost entirely , with the intercentra enlarged as the main body of the vertebrae . This weaker type of backbone <a href='uninflect' title='7'><mark>indicates</mark></a> the stereospondylous temnospondyls spent more time in water . 
Temnospondyls  vertebrae r divided into several segments . In living tetrapods , da main body of tdavertebra a single piece of bone called thdaentrum , but in temnospondyls , this region was divided into a pleurocentrum and intercentrum . Two types of vertebrae are recognized in temnospondyls : stereospondylous and rhachitomous vertebrae . In rhachitomous vertebrae , the intercentra large and wedge @-@ shaped , and thedaeurocentra relatively small blocks fit between them . Both elements support a spine @-@ like neural arch , and well @-@ developed interlocking projections called zygapophyses strengthen the connections between vertebrae . The strong backbone and strong limbs of many ratchitomous temnospondyls allowed them to be partially , and in some cases fully , terrestrial . In stereospondylous vertebrae , the pleurocentra done been lost entirely , w/ the intercentra enlarged as the main body of the vertebrae . This weaker type of backbone indicate the stereospondylous temnospondyls spent more time in water .