Monograptid

Kingdom: Animalia Phylum: Hemichordata Class: Pterobranchia Sublass: Graptolithinia Order: Graptoloidea Family: Monograptidae Large monograptid with visibly hooked thecae and straight rhabdosome. Sicula is missing. Proximal thecae and sicula are absent. Thecal overlap is extensive. Prothecal ventral wall is inclined and proximal-metatheca transition is curved. Preapertural metatheca is widening and proximal metatheca is straight in the prox-mesial thecae and concave mesially and distally. 2TRD is 1.7 mm mesially to 1.8 mm distally and rhabdosome width is 1.1 mm to 1.9 mm. Rhabdosome is straight. Thecae apertures face proximally. Possible preservation of lateral apertural spines on the mesial thecae (0.8 mm).