Blackwelderia sp. 4

Order Corynexochida / Suborder Leiostegiina / Superfamily Dameselloidea / Family Damesellidae / Subfamily Damesellinae

Blackwelder, a surname, referring to E. Blackwelder, an early-20th-century collector of North China trilobite

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This species occurs in the Fulu Biota of Yunnan. Surface with sparse small nodes; genal spines and pleural spines bearing denticles. Anterior border incompletely preserved; glabella long and conical, ante riorly showing the hypostome in outline; eyes relatively large; librigenae medium-wide, slightly incurved near the genal spine. Thorax of 12 segments; axis narrower than pleurae; pleural furrows wide and deep, pleural spines medium-length. Pygidium tri angular apart from spines; 7 pairs of marginal spines of unequal length, the sixth pair longest and the first second.