dorsal suture การใช้

• The primitive state of the dorsal sutures is proparian.
• The thorax has the continuous dorsal suture across the middle, along with well-defined posterior calli.
• The  Fallotaspidoidea remain paraphyletic ( hence the quotation marks ), even after reorganizing it, because it gave rise to the trilobites with dorsal sutures.
• The pods are small, sessile, puberulent to strigose, spreading to declined, often humistrate, in profile ovoid-oblong, straight or a trifle incurved, obtuse at base, abruptly acute at apex to short-mucronate, thickened, incompletely to fully bilocular ( 2-celled ), cordate in cross-section, trigonous or compressed-triquetrous, the lateral faces flat, the dorsal ( upper or adaxial ) face narrower and sulcate ( grooved ), carinate by the ventral suture, the dorsal suture shallowly to deeply sulcate; thin, papery, green to stramineous ( brownish ) valves strigulose, 4 7 mm long, 1?2?mm in diameter, deciduous from receptacle, dehiscence primarily basal and occurs after falling.