American Malacological Bulletin (AM MALACOL BULL )

Publisher: American Malacological Union

Description

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.

  • Impact factor
    1.00
    Show impact factor history
     
    Impact factor
  • 5-year impact
    0.87
  • Cited half-life
    0.00
  • Immediacy index
    0.38
  • Eigenfactor
    0.00
  • Article influence
    0.27
  • Website
    American Malacological Bulletin website
  • Other titles
    American malacological bulletin
  • ISSN
    0740-2783
  • OCLC
    9753438
  • Material type
    Periodical
  • Document type
    Journal / Magazine / Newspaper

Publications in this journal

  • [Show abstract] [Hide abstract]
    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.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Abstract: The Bostryx stelzneri species complex is taxonomically reviewed with the description of a new species. This complex is formed by Bostryx stelzneri (Dohrn, 1875), B. peristomatus (Doering, 1879), B. scaber (Parodiz, 1948) and Bostryx roselleus n. sp., all distributed in Argentina. B. peristomatus and B. scaber are elevated to specific status on the basis of morphological characters. This complex has the spire less than half the total shell height and the aperture higher in relation to total shell height than in any other species of the genus. Traditional shell morphometry and a geometric morphometric analysis were used to document shell variation in size and shape among species. Radula, jaw and shell morphology were examined with SEM. All species in the complex are described or red scribed using new morphological information. In this species complex, pallial organs are very similar among species and vary only in the degree of opening of the secondary ureter. The genitalia differ in the relative proportion of organs, such as length of vagina relative to free oviduct and penis or epiphallus length relative to penis length. Sculpture of the inner wall of the flagellum and epiphallus is similar in all species studied, whereas sculpture of the inner wall of the penis is variable. The geometric morphometric allows an objective interpretation of shell shape variation detecting differences in shape components irrespective of the differences in size between Bostryx species of the stelzneri group.
    American Malacological Bulletin 01/2014; 32:74-93.
  • American Malacological Bulletin 01/2013; 31(2):289-296.
  • [Show abstract] [Hide abstract]
    ABSTRACT: Zidona dufresnei Donovan, 1823 is an endemic snail of the southwestern Atlantic Ocean. In San Antonio Bay, Río Negro Province, it is commonly found in the intertidal zone all year round and from October to April the females deposit planoconvex egg capsules attached to hard substrates. The population of Z. dufresnei studied is an exception because it is unique in that inhabits shallow waters. The main goal of this study was to determine the duration of the direct intracapsular development of Z. dufresnei in the fi eld. Results show that the intracapsular development takes 34.5 ± 3.8 days. In late developmental stages, a mean of three embryos per capsule was observed. Developmental duration under natural conditions was shorter than in lab conditions previously studied. The shorter developmental period than that reported for other temperate neogastropods may be related to the high summer water temperatures and high salinity at the location studied. Shorter embryonic duration would be important for this population of Z. dufresnei which inhabits an environment of high predation pressure on egg capsules.
    American Malacological Bulletin 01/2013; 31(1):85-89.

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