 The theca is fattened, boot-shaped and asymmetrical.The edges of the flat sides of the theca seem to consist of 14 elements, 11 defining the outline of the theca, and 3 are processes, one forming a "toe"-spike, a second a heel-spike and a third a lip-spike.The so-called "obverse"-side ("toe" pointing left), is covered with one thin integument, at the "reverse"-side the integument is interrupted by a "strut" formed by a branch of an element near the attachment of the stem, and a branch of an element at the top of the theca.