New Cladid Crinoid (Phylum Echinodermata) from the Middle Devonian Delaware Limeston, Franklin County, Ohio

Author Institution: Department of Geological Sciences, The Ohio State UniversityA new species of Goniocrinus, G. saettii, is described from the Delaware Limestone of Franklin County, OH. This is the first crinoid described from the Delaware Limestone and the first cladid crinoid described from Devonian limestones of Ohio. This new occurrence suggests that additional new echinoderm specimens may be found in Devonian limestones of Ohio with a directed search for strata conducive to complete echinoderm preservation, that is, rapidly deposited, fine-grained facies

Biovolume Revisited: A Relative Diversity Index for Paleological Analyses

Author Institution: Wright State UniversityA new application of the biovolume abundance index is proposed for relative diversity demography in paleoecological analyses. Use of this technique will improve confidence in data validity and solve the following inadequacies of other numerical census techniques: all groups are treated equally, samples from different lithologies can be meaningfully compared, colonial and solitary organisms are treated equally, whole and fragmentary fossils are treated equally, and time averaging effects are assumed. Biovolume is the paleontological analog of biomass, and it is a measure of the relative amount of energy expended by organisms to secrete skeletal material that has been incorporated into the rock record

Phylogeny of Arenig to Caradoc crinoids (Phylum Echinodermata) and suprageneric classification of the Crinoidea

36 p., 11 fig., 3 tables.http://paleo.ku.edu/contributions.htm

Treatise on Invertebrate Paleontology

This volume is edited by Paul Selden, authors are Hans Hess and Charles G. Messing, coordinating author is William I. Ausich. This is the first volume to be published in an extensive revision of the Class Crinoidea. The present volume deals with the Subclass Articulata that contains all post-Paleozoic and living crinoids. The descriptions are preceded by an introduction, a chapter on the morphology of articulate crinoids, a glossary of important terms, and an overview of classification. The reference list is comprehensive for this volume.https://nsuworks.nova.edu/occ_facbooks/1009/thumbnail.jp

BIOMARKERS IN PALEOZOIC CRINOIDS (BORDEN GROUP, MISSISSIPPIAN): IMPLICATIONS FOR PHYLOGENY

O'Malley, Christina E., Ausich, William I., and Chin, Yu Ping 2005, Biomarkers in Paleozoic crinoids (Borden Group, Mississippian): implications for Phylogeny [poster]: Geological Society of America Annual Meeting, 2005, Session 57, Paper 57-8. Abstract published: Geological Society of America, Abstracts with Programs, Vol. 37, No. 7, p. 133; http://gsa.confex.com/gsa/2005AM/finalprogram/abstract_95335.ht

CRINOIDS FROM THE NADA MEMBER OF THE BORDEN FORMATION (LOWER MISSISSIPPIAN) IN EASTERN KENTUCKY

ABSTRACT—Thirty-four crinoid species, including four new species, are reported from the Nada Member of the Borden Formation in eastern Kentucky. The dominant crinoid group is monobathrids (18 species), but diplobathrids, disparids, cladids, and flexibles are also present. The four new species are the camerates Blairocrinus protuberatus, Uperocrinus acuminatus, and Aorocrinus nodulus, and the cladid Atelestocrinus kentuckyensis. The majority of the species in this fauna were previously known from what has traditionally been considered the ‘‘upper part’ ’ of the Burlington Limestone in the Mississippi River Valley and what is now recognized as the Burlington Pelmatozoan Assemblage III. The current study confirms the conclusion of Lane and DuBar (1983) that the Nada is middle Osagean in age, being deposited earlier than the well-documented Borden delta crinoid assemblages of north-central Kentucky and Indiana. The middle Osagean age of the fauna indicates a previously unrecognized unconformity between the Nada and the overlying Meramecian-age Renfro Member of the Slade Formation. In addition, this is the first well-documented middle Osagean fauna from a siliciclastic facies in North America. The dominance by camerate crinoids is enigmatic, but may be related to either a low rate of sedimentation or greater larval dispersal abilities

Food Security in Nutrient-Stressed Environments: Exploiting Plants' Genetic Capabilities, Summary and Recommendations of an International Workshop 27-30 Sep 1999

Attended by 50 international participants, this workshop marked the culmination of Phase III of a 15-year Special Project at the International Crops Research Institute for the Semi-Arid Tropics (ICRISAT) funded by the Government of Japan Entitled "Sustainable cultivation of upland crops in the semi-arid tropics", the Project was executed in collaboration between ICRISAT and Japan International Research Center for Agricultural Sciences (JIRCAS). The workshop objectives were to: Explore the scope for genetic manipulation of the ability of crop plants to access and use nutrients, prioritize candidate mechanisms of enhancing nutrient uptake and use in terms of their suitability for genetic manipulation, examine appropriate methodologies for genetic enhancement of crop plants' ability to absorb nutrients and use them efficiently, and suggest how genetic options can best be combined with management options to improve nutrient uptake and use. Over 30 papers were presented in sessions on: sustainability of breeding for low-nutrient environments, candidate mechanisms, methodologies, and combining genetic improvement with natural resource management. Extended abstracts of all papers are included, together with an introductory review that includes colored photographs of Project Highlights. Session interpretive summaries, and recommendations for future research needs, priorities and strategies are provided

Taphonomy of Isocrinid Stalks: Influence of Decay and Autotomy

Stalks of isocrinid crinoids are differentiated into cirri-bearing columnals (nodals) and columnals lacking cirri (internodals). This skeletal differentiation allowed us to test whether stalk fragmentation is random or whether it occurs preferentially at a specific articulation. Our analyses indicate that the patterns of fragmentation in multicolumnal segments of extant isocrinids collected by submersible, by dredging, and in sediment samples, as well as those found as fossils, are nonrandom. The preferred plane of fragmentation corresponds to the synostosis, the articulation between a nodal and the internodal distal to it. In isocrinids this articulation has a characteristic morphology and is the site of autotomy. Although stalk shedding by autotomy may contribute to the observed patterns, decay experiments on isocrinid stalks, both in situ and in the lab, suggest that post-mortem disarticulation also results in nonrandom fragmentation. Thus both processes, autotomy and post-mortem decay, contribute to the observed pattern of fragmentation. Underlying both processes is the organization of soft tissues at synostoses