... the Mississippian (Chesterian) Kinkaid Formation of southern Illinois bearing 242 specimens of the edrioasteroid Neoisorophusella lanei attached to internal molds of Promytilus bivalves. To assess edrioasteroid paleoecology we examined edrioasteroid age structure, thecal orientation, spatial utilization, and degree...

.... by the proportionately wider ambulacra, wider oral area and smaller proximal-most peripheral rim plates ( Fig. 1.4 ). Neoisorophusella lanei Kammer et al. has small nodes at the tips of the ambulacral cover plates, more widely exposed secondary cover plates, and much narrower peripheral rim ( Fig. 1.6...

... (1975 , personal commun., 2004). Isorophida Bell, 1976 Isorophina Bell, 1976 Agelacrinitidae Chapman, 1860 Neoisorophusella Kammer et al., 1987 Neoisorophusella lanei Kammer et al., 1987 . Kammer et al. (1987) described Neoisorophusella based on two...

.... 2003 . Implications of a constant feeding area to volume ratio in Neoisorophusella lanei (Edrioasteroidea, Echinodermata) . Geological Society of America, Abstracts with Programs , 35 : 24 – 12 . Harker P. 1953 . A new edrioasteroid from the Carboniferous of Alberta . Journal...

... a bimodal distribution ( Sumrall, 2010 ). Weaker bimodal distributions have been found in populations of Neoisorophusella lanei ( Kammer et al., 1987 ) and S. vorticellatus ( Meyer, 1990 ). A bimodal population distribution is likely the result of a recruitment hiatus, multiple spatfalls, or some other...

... specimens is similar in shape to the total population of C. ulrichi suggesting similar low mortality of established juveniles. This is in sharp contrast with the weakly bimodal distribution observed for the Mississippian edrioasteroid Neoisorophusella lanei Kammer, Tissue, and Wilson, 1987 that showed...

...Figure 5. Ambulacral ontogeny of the edrioasteroid Neoisorophusella lanei , ambulacra darkened, all figures, ×20. A, Small juvenile showing four oral cover plates centrally and the early development of the shared BC and DE ambulacra laterally. B, Slightly older individual showing the formation...