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Franck Boyer

  • Biodiversity Journal, 15 (3): 525-545

    Franck Boyer
    Revision of the wavy ornated cystiscids (Volutoidea Cystiscidae) from the Dhofar (southern Oman) and description of new taxa
    https://doi.org/10.31396/Biodiv.Jour.2024.15.3.525.545
    https://www.zoobank.org/311F3724-B950-4086-BC5A-2923D2964B70

    ABSTRACT
    The cystiscids species (Volutoidea Cistiscidae) from the Dhofar (southern Oman) with wavy ornated shells are revised on the ground of semi-intensive samplings, mainly operated off Mirbat (Central Dhofar) and more incidentally in other places off Central and Western Dhofar. This species complex, alternatively placed by authors in the genus Persicula Schumacher, 1817 or in the genus Gibberula Swainson, 1840, is considered to belong to a well-distinctive disbranching among the Cystiscidae, and its placement in a new genus Sagittalia n. gen. is proposed, with Marginella sagittata Hinds, 1844 as type species. Seven cystiscid species from the Dhofar are proposed in this new genus, two of them previously described as Persicula masirana Roth et Petit, 1972, and Gibberula peterbonuttii Cossignani et Lorenz, 2018, four of them being described as new: Sagittalia anapaulae n. sp. from Mirbat and the Saadah (Central Dhofar), S. willeminae n. sp. from Salalah (Western Dhofar), S. eloiseae n. sp. from Western and Central Dhofar, S. vickydobsonae Boyer et Childs n. sp. and S. peterbonuttii (Cossignani et Lorenz, 2018), both from Mirbat and the Saadah (Central Dhofar), and an undescribed species of Sagittalia sp. A only known by one specimen collected at 24–28 m depth off Mirbat are discussed. Two main phenetic clusters are recognized in this fauna: the cluster S. anapaulae/S. willeminae and the cluster S. eloiseae/S. vickydobsonae/S. peterbonuttii, whereas the relationship of S. masirana and of Sagittalia sp. remains unstated, despite their closely matching animal chromatism. Comparison is proposed with other wavy ornated species from the Arabian Region and from other regions of the Indo-Pacific and Atlantic Provinces, with the analogous fossil fauna documented from the French mid-Eocene and with Recent brother-groups of zig zag ornated cystiscids with reduced number of waves.

  • Biodiversity Journal, 15 (3): 517-523

    Franck Boyer & José Rosado
    Finding of Marginella caterinae Bozzetti et G. Raybaudi, 1991 (Volutoidea Marginellidae) in Dhofar (Sultanate of Oman) and description of a sympatric sibling species
    https://doi.org/10.31396/Biodiv.Jour.2024.15.3.517.523
    https://www.zoobank.org/D5306506-C5E6-4206-84FB-27417AF6148F

    ABSTRACT
    Marginella caterinae     Bozzetti et G. Raybaudi, 1991 (Volutoidea Marginellidae), descrive from Somalia, is revised on the ground of specimens collected along the central coast of the Dhofar, Oman. A sibling species collected in sympatry is described as M. gabrielae n. sp. The shell variability of both species is discussed, and their animal chromatism is illustrated. The generic placement of this species group is discussed, as well as its affinities with the species group of M. cloveri Rios et Matthews, 1972 distributed off equatorial and tropical Brazil.

  • Biodiversity Journal, 14 (4): 0637-0642

    Franck Boyer & Walter Renda
    Description of two new species of Prunum Herrmannsen, 1852 (Gastropoda Marginellidae) from Callao, Peru
    https://doi.org/10.31396/Biodiv.Jour.2023.14.4.637.642
    https://www.zoobank.org/938E4262-A9ED-4D98-85C7-D86B2247CB0F

    ABSTRACT
    Two new Marginellidae species are described from Callao, Peru, and placed into the genus Prunum Herrmannsen, 1852, as P. sigmoides n. sp. and P. lamellosum n. sp. The reliability of the locality attributed to these new species is discussed, and the two species are considered to come with high probability from Western South America, due to their original features not matching Prunum morphs known from the rest of the Panamic Province, Caribbean or West Africa.

  • Biodiversity Journal, 14 (3): 0513-0532

    Franck Boyer
    About some marginelliform gastropods (Marginellidae Cystiscidae and Granulinidae) from French Guyana
    https://doi.org/10.31396/Biodiv.Jour.2023.14.3.513.532
    https://www.zoobank.org/406298CA-CAA4-459D-BD8D-BC870A56642A

    ABSTRACT
    The study of a small collection of millimetric marginelliform gastropods sampled off French Guyana allows to recognize the occurrence of three species previously described, namely Eratoidea margarita (Kiener, 1834), E. sulcata (d’Orbigny, 1842), and E. acutulla McCleery, 2011, and of 13 new species described as Hyalina oblongata n. sp., Volvarina similis n. sp., V. vitrea n. sp., V. cornea n. sp., Prunum guyanensis n. sp., Eratoidea mccleeryi n. sp., E. strangulata n. sp., E. inflata n. sp., E. angulosa n. sp., E. serratula n. sp., E. flavida n. sp., Gibberrula contracta n. sp. and Granulina ampla n. sp. The phenotypic variability and the geographic distribution are documented mainly with the help of data obtained from the O.C.P.S. collection (Leiden Museum), and more incidentally with the help of the 2011 McCleery’s revision of the Caribbean fauna of the genus Eratoidea Weinkauff, 1879.