American Malacological Bulletin (AM MALACOL BULL )

Publisher: American Malacological Union


The American Malacological Bulletin (AMB), published twice each year, contains peer-reviewed contributed articles and symposium papers. Special Editions of the Bulletin, containing topics of exceptional interest, are published as supplements.

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Publications in this journal

  • [Show abstract] [Hide abstract]
    ABSTRACT: Cowries (Cypraeidae) are diverse and occur in all tropical and some temperate seas, from shallow waters to the deep sea. There is a vast literature documenting the distribution, taxonomy, and shell variation, among many other topics. Because of its popularity among shell collectors, amateurs have contributed more to the cowrie literature than to most molluscan families. Traditionally, taxa have been described based on shell characters, and the majority of species descriptions continue to be published in non-peer-reviewed journals, magazines and books. Molecular studies in the last two decades have largely confi rmed phylogenies based on morphology and anatomy. Currently, 245 species and 166 subspecies (or 411 operational taxonomic units) are recognized in 48 genera in the family. Despite being the best-known seashell family, the discovery curve suggests that there are still more taxa to be discovered. A review of the knowledge of the family is presented, and information on each genus is summarized.
    American Malacological Bulletin 09/2014; 32(2):278-289.
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    ABSTRACT: Modern estimates of species-level diversity in the recent Mollusca range from 34,000 to 120,000 described species, with total diversity including undescribed species often cited as 200,000. Most estimates are unverifiable, not being based on reproducible methods. Ultimately the best way to gauge diversity is explicit enumeration: actual listing of known species. Comprehensive lists of species are valued as a basis for systematic revisions and for comparing diversity across taxa, but it is less appreciated that they also provide a means for statistical sampling of biodiversity databases. I assessed the completeness of molluscan species listings in the World Register of Marine Species (WoRMS) by comparing it to a standardized inventory of the species represented in the Malacology collection of the Academy of Natural Sciences of Philadelphia (ANSP). Random samples of names were scored for presence or absence in WoRMS, with standard errors calculated from the binomial distribution. The WoRMS database has about 1,200 duplicate or extraneous listings for mollusk species and is missing about 1,300 (3%). Overall marine molluscan diversity is estimated at 43,600 ± 900 species, where 900 is a 95% confidence interval. The validity of this confidence interval depends on the WoRMS database and the ANSP collection not having correlated weaknesses. Lack of relatively complete species databases prevents similar assessments for terrestrial and freshwater mollusks, but, using less rigorous methods, I estimate that there are 70,000 to 76,000 described species of recent Mollusca. The low end of this estimate, 70,000 species, is similar to the number of recent chordate species, 69,000, so it is possible that the Mollusca are not the second most diverse phylum of animals in terms of recognized recent species. Naming rates for chordate are currently higher than for mollusk, 750 versus 600 species per year, although the Mollusca are regarded as having higher undescribed diversity. The Mollusca have long been considered the most species-rich marine phylum, but the estimate of 43,600 is substantially below the 56,000 species of Arthropoda listed in WoRMS. Globally, the ratio of marine gastropod to marine bivalve species in WoRMS is 4:1, which is higher than in any regional fauna, suggesting that gastropods have smaller geographic ranges on average than bivalves. The main remaining gaps in WoRMS are among opisthobranchs (8% missing) and Indo-Pacific marine mollusks (6%). The most diverse molluscan genus in WoRMS is Turbonilla, with more than 1,000 species listed as accepted.
    American Malacological Bulletin 09/2014; 32(2):308-222.
  • American Malacological Bulletin 09/2014;
  • American Malacological Bulletin 09/2014;
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    ABSTRACT: The population structure of three endemic land snail species of the genus Discula (Lowe,1831) on the archipelago of Madeira were studied. Ten allozyme loci were screened in 13 populations (11 from Madeira Island and two from the adjacent Desertas Islands) of D. polymorpha (Lowe, 1831), two populations of D. attrita (Lowe, 1831) and one population of D. calcigena (Lowe, 1831) from Porto Santo Island. All populations, except those from the Desertas, showed high levels of genetic variability. Deviation from Hardy-Weinberg equilibrium due to heterozygote defi ciency was detected in all D. polymorpha populations from Madeira and populations of D. attrita. This defi ciency was mainly attributed to inbreeding within the populations. No heterozygote defi ciency was found in D. calcigena, probably due to the larger population size of this species in the recent past. The FST values were signifi cant in many pairwise comparisons between the populations of D. polymorpha, with the highest values occurring between populations from Deserta Grande and the peninsula of Madeira. All interspecifi c FST values were highly signifi cant. FST values between populations of D. polymorpha from Deserta Grande and the Madeiran peninsula were comparable to observed interspecifi c values. Based on the factorial analysis all Madeiran populations grouped together, the populations from Deserta Grande formed a separate group, while the two populations of D. attrita show clear structuring.
    American Malacological Bulletin 01/2014; 1(32):52 - 61.