Volume 49 no. 1

VOL. 49, NO. 1 MALACOLOGIA 2006 CONTENTS

FULL PAPERS

SÓNIA C. S. ANDRADE & VERA N. SOLFERINI The Influence of Size on the Radula of Littoraria angulifera (Gastropoda:Littorinidae) ..................... 1

IGA LEWIN The Gastropod Communities in the Lowland Rivers of Agricultural Areas their Biodiversity and Bioindicative Value in the Ciechanowska Upland, Central Poland ...................................... 7

ROBERT A. D. CAMERON, LAURENCE M. COOK, GLENN A. GOODFRIEND & MARY B. SEDDON Fossil Land Snail Faunas of Porto Santo, Madeiran Archipelago: Change and Stasis in Pleistocene to Recent Times....................................................................................................................... 25

EUGENIA A. PIMENOVA & ANATOLY A. VARAKSIN Putative Nitroxidergic Cells in the Digestive System of Some Mytilids (Mollusca: Bivalvia: Mytilidae) Revealed by NADPH-Diaphorase Histochemistry ................................................................ 61

GEORGE M. DAVIS, WEI PING WU, GAIL WILLIAMS, HONG-YUN LIU, SHANG BIAO LU, HONG GEN CHEN, FENG ZHENG, DONALD P. MCMANUS & JIAGANG GUO Schistosomiasis japonica Intervention Study on Poyang Lake, China: The Snail's Tale ............... 79

DIEGO C. LUZZATTO The Biology and Ecology of the Giant Free Egg Capsules of Adelomelon brasiliana Lamarck, 1811 (Gastropoda: Volutidae) ................................................................................................................. 107

MARIA GABRIELA CUEZZO Systematic Revision and Cladistic Analysis of Epiphragmophora Doering from Argentina and Southern Bolivia (Gastropoda: Stylommatophora: Xanthonychidae).............................................................. 121

ALEJANDRA RUMI, DIEGO E. GUTIÉRREZ GREGORIC, VERÓNICA NÚÑEZ, INÉS I. CÉSAR, M. ANDREA ROCHE, MÓNICA P. TASSARA, STELLA M. MARTÍN & M. FERNANDA LÓPEZ ARMENGOL Freshwater Gastropoda from Argentina: Species Richness, Distribution Patterns, and an Evaluation of Endangered Species ..................................................................................................................... 189

RESEARCH NOTES

BERNHARD HAUSDORF & CLARA I. MEDINA BERMÚDEZ Two New Hirtudiscus Species from Colombia (Gastropoda: Scolodontidae)......................................211

SANTIAGO PEREDO, ESPERANZA PARADA, IVÁN VALDEBENITO & MATÍAS PEREDO Effect of Aerial Exposure on Physiological Condition and Survival of Diplodon chilensis (Bivalvia: Hyriidae) During Translocation ....................................................................................................... 217

LETTER TO THE EDITOR ROBERT A. D. CAMERON, BEATA M. POKRYSZKO, ADOLF RIEDEL & ANDRZEJ WIKTOR Checklists, Systematics and the CLECOM Initiative: An Alternative View from Europe............... 225

OBITUARY GEORGE M. DAVIS In Memoriam: Adolf M. Zilch, 1911-2006 ...................................................................................... 233