Volume 43 no. 1-2

VOL 43, NO. 1-2
Malacologia
2001


CONTENTS

P. VAN RIEL, K. JORDAENS, J.L. VAN GOETHEM & T. BACKELJAU
Genetic Variation in the Land Snail Isognomostoma isognomostoma (Gastropoda: Pulmonata: Helicidae) . 1

PABLO R. MARTÍN, ALEJANDRA L. ESTEBENET & NÉSTOR J. CAZZANIGA
Factors Affecting the Distribution of Pomacea canaliculata (Gastropoda: Ampullariidae) along Its Southernmost Natural Limit .......................................................................... 13

BRIGITTE GRIMM
Life Cycle and population Density of the Pest Slug Arion lusitanicus Mabille (Mollusca: Pulmonata) on Grassland .............................................................................................. 25

RONALD CHASE & DAVID G. ROBINSON
The Uncertain History of Land Snails on Barbados:  Implications for Conservation ....... 33

T. SITNIKOVA, P. RÖPSTORF & F. RIEDEL
Reproduction, Duration of Embryogenesis, Egg Capsules and Protoconchs of Gastropods of the Family Baicaliidae (Caenogastropoda) Endemic to Lake Baikal ............................. 59

KAREN L. KANDL, HSIU-PING LIU, ROBERT S. BUTLER, WALTER R. HOEH, & MARGARET MULVEY
A Genetic Approach to Resolving Taxonomic Ambiguity among Pleurobema (Bivalvia: Unionidae) of the Eastern Gulf Coast .............................................................................. 87

MARCO BODON, GUISEPPE MANGANELLI & FOLCO GUISTI
A Survey of the European Valvtiform Hydrobiid Genera, with Special Reference to Hauffenia Pollonera, 1898 (Gastropoda: Hydrobiidae) ................................................. 103

L. MERCAO, E. ITARTE, S. MARSHALL & G. ARENAS
Immunological Detection of a CK2 Activity in Tapes semidecussatus (Molllusca, Bivalvia) Mantle ......... 217

ANA VIRGINIA CALOGERAS DUTRA-DLARKE, CHARLENE WILLIAMS, REBECCA DICKSTEIN, NORBERT KAUFER & JAMES R. SPOTILA
Inferences on the Phylogenetic Relationships of Succineidae (Mollusca, Pulmonata) Based on 18S rRNA Gene ........................................................................................................ 223

ÁNGEL VALDÉS
Deep-Sea Cryptobranch Dorid Nudibranchs (Mollusca, Opisthobranchia) from the Tropical West Pacific, with Descriptions of Two New Genera and Eighteen New Species ............ 237

JØRGEN LÜTZEN, HIROSHI SAKAMOTO, AYAKO TAGUCHI & TOHRU TAKAHASHI
Reproduction, Dwarf Males, Sperm Dimorphism, and Life Cycle in the Commensal Bivalve Peregrinamor ohshimai Shôji (Heterodonta: Galeommatoidea: Montacutidae) .............. 313

ROBERT CIPRIANI & RÜDIGER BIELER
Eyeballs and Pitfalls: Estimating the Degree of Heterostrophy in the Heterobranch shell (Gastropoda: Heterobranchia) ....................................................................................... 327

ALEXEI V. KORNIUSHIN, IGOR A. GRIGOROVICH & GERALD L. MACKIE
Taxonomic revision of Pisidium punctatum Sterki, 1895 (Bivalvia: Sphaeriidae) ........... 337