The very characteristic shape of this species makes it readily recognizable. No other schizasterid has such an anterior apical disc and backwardly directed anterior petals. Zitt (1981) redescribed the ...

Holasteroida are distinguished from their sister group the Spatangoida by their apical disc structure and by their plastron architecture. Spatangoids have an amphisternous or protoamphisternous ...

-- Largest AMS study-to-date will further evaluate the safety and efficacy of this important option for the treatment of pelvic organ prolapse MINNEAPOLIS, June 9, 2014 /PRNewswire/ -- American ...