Gymnocodium, Pia, 1920 emend. Elliott, 1955

Vachard, D, Krainer, K & Lucas, SG, 2015, Late Early Permian (late Leonardian; Kungurian) algae, microproblematica, and smaller foraminifers from the Yeso Group and San Andres Formation (New Mexico; USA), Palaeontologia Electronica (English ed.) 3 (8), pp. 1-77 : 16

Genus GYMNOCODIUM ?

Description. The regional representatives differ from true Gymnocodium by the absence of conceptacles, the thallus less regularly cylindrical and not bifurcated, the occasionally well preserved medullary zone, the smaller deltoids, and the cortical siphons better preserved; however, these characters seem to be insufficient to create a distinct genus or subgenus. Gymnocodium ? differs also from Permocalculus Elliott, 1955 in the thallus less regularly segmented, the wider deltoids, the lesser number of ramifications of the cortical siphons, and the absence of conceptacles.

Composition. Gymnocodium ? johnsonii n. sp., G.? bacillum n. sp. (and their possible synonyms indicated below).

Occurrence. Kungurian (= late Leonardian) of New Mexico; Artinskian-Kungurian (early-late Leonardian) of Guatemala. Possibly present in the Early Permian of South China ( Li and Mamet, 1993) and North China ( Mamet and Zhu, 2005).