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  • 1
    Publication Date: 2016-04-26
    Description: Species are fundamental units in evolutionary biology. However, defining them in taxonomically problematic groups requires integration of independent sources of information in order to develop robust hypotheses for taxonomic classification. Here, we propose an integrative framework for species delimitation in the Mediterranean species of the genus Cerithium (Caenogastropoda: Cerithiidae), whose shells show a wide variety of forms resulting in problematic morphological identification at the species level. Combined sequence data of two mitochondrial genes (COI+12S) for 55 individuals from the central Mediterranean Sea were used to test the species status of six identified morphotypes. Phylogenetic analyses, as well as DNA-based methods of species delimitation (automatic barcode gap discovery, species delimitation plugin and genealogical sorting index), support the species status of three morphotypes ( C. vulgatum = MOTU-A, C. alucastrum = MOTU-B and C. protractum = MOTU-C), sometimes considered as ecotypes. Molecular operational taxonomic unit (MOTU)-D includes large individuals morphologically assigned to C. vulgatum (from Brindisi and Oristano) and C. repandum (from Tunisia), but all probably represent C. repandum which, if valid, would then not be endemic to its type locality in the Gulf of Gabès. All individuals identified as C. lividulum grouped in MOTU-E, except those from Tunisia which cluster in MOTU-F with some C. renovatum. Cerithium renovatum from Crete forms an endemic group (MOTU-G), suggesting a possible cryptic species. Our results show only partial concordance between traditional morphology and sequence data, indicating that the former is not always sufficient for recognizing species level taxa within Mediterranean Cerithium , although protoconch morphology is a key feature for distinguishing between species with superficially similar teleoconchs. Further analyses based on more comprehensive geographic sampling and more mitochondrial markers, and including a number of nuclear loci, are needed to clarify Mediterranean Cerithium diversity more fully.
    Print ISSN: 0260-1230
    Electronic ISSN: 1464-3766
    Topics: Biology
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  • 2
    Publication Date: 2014-01-21
    Description: While central and northern European land-mollusc forest communities have received considerable research effort, southern Europe has enjoyed much less attention. Despite the extent of Italian forests in terms of altitude and latitude, there has been only one previous quantitative study of their molluscan faunas. This paper describes the molluscan communities of six forest habitats in northern Italy along an altitudinal transect. Species richness had its highest values at low elevations, especially in maritime woodland and in riverine poplar woodland. Species abundance decreased from lowland to montane habitats, possibly as a consequence of a transition from eutrophic to oligotrophic habitats and from calcareous to acidic soils. Compared with the central and northern European forests, the Italian forests were poorer as far as species richness is concerned, but showed greater diversity among locations as the Jaccard presence/absence similarity index among habitats is equal or lower than 0.5. Considering abundances, all molluscan communities were significantly different in pairwise comparisons, with the single exception of the montane mixed-deciduous and beech forests. The low faunal similarity among sites and the high percentage of species found in only one habitat support the need for a network of diverse protected areas to preserve land-mollusc biodiversity.
    Print ISSN: 0260-1230
    Electronic ISSN: 1464-3766
    Topics: Biology
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  • 3
    Publication Date: 1972-01-01
    Print ISSN: 0009-5915
    Electronic ISSN: 1432-0886
    Topics: Biology , Medicine
    Published by Springer
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  • 4
    Publication Date: 2011-07-28
    Print ISSN: 0960-3115
    Electronic ISSN: 1572-9710
    Topics: Biology
    Published by Springer
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  • 5
    ISSN: 1432-0886
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology , Medicine
    Notes: Abstract The cladoceran Daphnia middendorffiana is an arctic species able to produce winter eggs which develop parthenogenetically. The cytological study of the maturation of summer and winter eggs of an italian population of this species has shown that both types of eggs undergo only one maturation division of equational type with the expulsion of only one diploid polar body, the same maturation process as had been found in the pseudosexual eggs of a race of Daphnia pulex (Schrader, 1925).—The chromosomes behaviour during the maturation of summer and winter eggs of D. middendorffiana has been compared with that of a population of D. pulex which shows a normal heterogonic cycle.
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    New York, NY : Wiley-Blackwell
    Journal of Morphology 150 (1976), S. 711-725 
    ISSN: 0362-2525
    Keywords: Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: The fine structure of midgut cells in two species of Cladocera (Crustacea: Branchiopoda) has unique features when it is compared to that in the midguts of other arthropods. Features which suggest that food is absorbed in digested form are: the presence of the peritrophic membrane, the glycocalyx, the almost complete absence of pinocytotic vesicles, and the large surface area of a great number of microvilli. Digested products presumably pass into the hemolymph through the network of extracellular canals and cisterns surrounding the basal ends of intestinal epithelial cells. Cells of the midgut in Cladocera differ from those of other arthropods in the simplicity of their basal plasma membranes, which are not highly folded. The small number of membrane invaginations suggests that water reabsorption is very slight, as is the usual condition in aquatic animals.The origin and evolution of peculiar structures we call “multivesicular-like bodies” have been investigated. These display a variety of different morphological features. Some contain acid phosphatase activity and are considered as specialized lysosomes.
    Type of Medium: Electronic Resource
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  • 7
    Publication Date: 2019-05-10
    Description: We revise the type specimens of 132 nominal species of worldwide Triphoridae stored in the Natural History Museum of the United Kingdom (NHMUK), London. We provide the species name in its original combination, followed by bibliographic details of the original description, the location of the known type material, the original description (and its translation when in Latin), a diagnosis and curatorial or nomenclatural notes. We illustrated most specimens in the type series in colour and with SEM imaging and we have added the original figure whenever possible. The specimens of Triphoris alveolatus, T. granulatus, T. suturalis and T. verrucosus, all A. Adams & Reeve, 1850, T. pfeifferi Crosse & Fischer, 1865 and T. cucullatus de Folin, 1867, previously considered type material, are not considered here belonging to the type series. Adams & Reeve’s taxa should be considered nomina dubia. The name Triphora insularum is a manuscript name by H.E.J. Biggs who deposited “types” in the NHMUK but refrained from introducing the name due to the lack of apex of the studied material. We selected lectotypes for six species (T. concors Hinds, 1843, T. maxillaris Hinds, 1843, T. fuscomaculata E.A. Smith, 1904, T. shepstonensis E.A. Smith, 1906, T. eupunctata G.B. Sowerby III, 1907, and T. rufula Watson, 1886) to stabilize the nomenclature. Finally, we illustrate original specimens (although not types) of three species described by Turton, whose type material is lost.
    Keywords: Atlantic Ocean ; Caribbean ; Eastern Pacific ; Indo-Pacific province ; lectotype designation ; Mediterranean Sea ; South Africa ; South Australia ; taxonomy ; type specimens
    Repository Name: National Museum of Natural History, Netherlands
    Type: Article / Letter to the editor
    Format: application/pdf
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  • 8
    Publication Date: 2024-01-12
    Description: We review the type specimens belonging to 71 species of Indo-Pacific Triphoridae Gray, 1847 stored \nin the Mus\xc3\xa9um national d\xe2\x80\x99Histoire naturelle in Paris. We provide detailed information on the original \ndescription, a diagnosis according to the most recently recognized diagnostic characters, and curatorial \nand nomenclatorial notes. The lots of Triforis (Iniforis) mirifica var. lifuana Hervier, 1898, Mastonia \nfunebris Jousseaume, 1884, Mastonia issa Jousseaume, 1898, Inella numerosa Jousseaume, 1898, Mastonia obesula Jousseaume, 1884, Obesula pantherina Jousseaume, 1898, Mastonia peanites Jousseaume, \n1898, Inella perimensis Jousseaume, 1898, Inella rossiteri Jousseaume, 1884 and Obesula senilis Jousseaume, 1898 contained specimens belonging to multiple species and we here designate lectotypes \nto stabilize nomenclature. We invalidate the neotype designation of T. pupaeformis Deshayes, 1863 \nbecause of significant differences between the neotype and Deshayes\xe2\x80\x99 original description. Triforis \nplicatus Deshayes, 1834 is a Newtoniellidae Korobkov, 1955. Finally, we consider the name Triphora \nlamyi Selli, 1974 unavailable.
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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  • 9
    Publication Date: 2024-01-12
    Description: We revise the type specimens of 132 nominal species of worldwide Triphoridae stored in the Natural History Museum of the United Kingdom (NHMUK), London. We provide the species name in its original combination, followed by bibliographic details of the original description, the location of the known type material, the original description (and its translation when in Latin), a diagnosis and curatorial or nomenclatural notes. We illustrated most specimens in the type series in colour and with SEM imaging and we have added the original figure whenever possible. The specimens of Triphoris alveolatus, T. granulatus, T. suturalis and T. verrucosus, all A. Adams & Reeve, 1850, T. pfeifferi Crosse & Fischer, 1865 and T. cucullatus de Folin, 1867, previously considered type material, are not considered here belonging to the type series. Adams & Reeve\xe2\x80\x99s taxa should be considered nomina dubia. The name Triphora insularum is a manuscript name by H.E.J. Biggs who deposited \xe2\x80\x9ctypes\xe2\x80\x9d in the NHMUK but refrained from introducing the name due to the lack of apex of the studied material. We selected lectotypes for six species (T. concors Hinds, 1843, T. maxillaris Hinds, 1843, T. fuscomaculata E.A. Smith, 1904, T. shepstonensis E.A. Smith, 1906, T. eupunctata G.B. Sowerby III, 1907, and T. rufula Watson, 1886) to stabilize the nomenclature. Finally, we illustrate original specimens (although not types) of three species described by Turton, whose type material is lost.
    Keywords: Atlantic Ocean ; Caribbean ; Eastern Pacific ; Indo-Pacific province ; lectotype designation ; Mediterranean Sea ; South Africa ; South Australia ; taxonomy ; type specimens
    Repository Name: National Museum of Natural History, Netherlands
    Type: info:eu-repo/semantics/article
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