caa a22 4500 388017457 CHVBK 20180307124915.0 cr unu---uuuuu 161130e199801 xx s 000 0 eng 10.1017/S0022336000024057 doi S0022336000024057 pii (NATIONALLICENCE)cambridge-10.1017/S0022336000024057 Apparatus composition and structure of the Pennsylvanian conodont genus Gondolella based on assemblages from the Desmoinesian of northwestern Illinois, U.S.A [Elektronische Daten] [Peter H. von Bitter, Glen K. Merrill] Gondolella pohli new species assemblages, from the Desmoinesian of Illinois, confirm that the initial apparatus reconstruction of the conodont genus Gondolella was incomplete and support later reconstructions based on discrete elements. Gondolella pohli is the first species of a biostratigraphically important conodont genus to be based primarily on assemblages and to be placed within a known phylogeny. The 43 assemblages confirm the presence of seven distinct element types in the Gondolella apparatus and permit the reconstruction of each of these to a greater degree than previously possible. Because the assemblages are probably all fecal, the apparatus of the closely related Neogondolella is used to interpret the apparatus plan—the position and identity of the 15 elements—single pairs of Pa, Pb, M, Sb1, and Sb2 elements, two pairs of Sc elements, and an unpaired bilaterally symmetrical Sa element in the Gondolella apparatus. Using the similarity of the latter to the apparatuses of the better known ozarkodinids, we infer a three-dimensional fanlike apparatus architecture for the prioniodinid Gondolella. Gondolella is apparently restricted to the Pennsylvanian and probably evolved in the Early Pennsylvanian from the Idioprioniodus-Embsaygnathus lineage by loss of the Pa element posterior process and by remodelling of the other apparatus elements. Some species in the Idioprioniodus-Gondolella lineage are atypical among prioniodinids in having developed a Pa element platform; the lineage is also noteworthy because both ancestor and descendant inhabited low-energy, low pH environments during the Pennsylvanian. Copyright © The Paleontological Society von Bitter Peter H. Royal Ontario Museum and University of Toronto, Toronto, Canada M5S 2C6 aut Merrill Glen K. University of Houston-Downtown, Houston, TX 77002 aut Journal of Paleontology Cambridge University Press 72/1(1998-01), 112-132 0022-3360 72:1<112 1998 72 JPA https://doi.org/10.1017/S0022336000024057 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1017/S0022336000024057 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- von Bitter Peter H. Royal Ontario Museum and University of Toronto, Toronto, Canada M5S 2C6 aut NATIONALLICENCE 700 1- Merrill Glen K. University of Houston-Downtown, Houston, TX 77002 aut NATIONALLICENCE 773 0- Journal of Paleontology Cambridge University Press 72/1(1998-01), 112-132 0022-3360 72:1<112 1998 72 JPA CC0 http://creativecommons.org/publicdomain/zero/1.0 nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-cambridge