Rhombotrypa is a large ramose form, unique in its square zooecia in the endozone, best seen in a transverse section. Zooecia are thick-walled, with numerous diaphragms in the exozone. Mesozooids and styles are absent.
Rhombotrypa multitabulata Utgaard and Perry, 1964
Reference: Utgaard and Perry, 1964
Rhombotrypa quadrata (Rominger, 1866)
Occurrence: Waynesville, Liberty, Whitewater, Saluda, Elkhorn
Reference: Utgaard and Perry, 1964; Brown and Daly, 1985; Schumacher et al. in Davis and Cuffey, 1998 (mention)
Originally named Chaetetes quadratus. Also called Monticulipora quadrata, Monotrypella quadrata.
Rhombotrypa subquadrata (Ulrich, 1882)
Occurrence: Arnheim, Waynesville, Liberty
Reference: Brown and Daly, 1985 (mention)