What is "recumbirostra"

Recumbirostra is a clade of lepospondyl amphibians from the Carboniferous and Permian that includes the families Pantylidae, Gymnarthridae, Ostodolepidae, Goniorhynchidae, Brachystelechidae, and Microbrachidae. Recumbirostra was erected as a clade in 2007. It includes many lepospondyls traditionally grouped in " Microsauria", which has since been shown to be a paraphyletic grouping. Not all phylogenetic analyses recognize Recumbirostra as a valid grouping. An alternative clade called Tuditanomorpha is occasionally supported and includes many of the same taxa. Below is a cladogram showing the phylogenetic relationships of recumbirostrans from Glienke (2012):

Most authors consider recumbirostrans to be lepospondyl amphibians; however, a phylogenetic analysis conducted by Pardo, Szostakiwskyj and Anderson (2015) recovered them as sauropsid amniotes instead.