188 research outputs found
File S4: Common synapomorphies mapped onto the phylogenetic hypothesis resulting from the use of unordered characters
A revision of the status of Lepadogaster lepadogaster (Teleostei : Gobiesocidae): sympatric subspecies or a long misunderstood blend of species?
Molecular (partial mitochondrial 12S ribosomal DNA sequences), morphological and meristic analysis of Lepadogaster lepadogaster lepadogaster, L. l. purpurea and L. zebrina were performed to investigate the relationships between these taxa. On the western shore of mainland Portugal, where the two subspecies of L. lepadogaster occur sympatrically, they differ in microhabitat preferences and their breeding seasons are largely out of phase. This information, combined with data on distribution patterns, led to the following conclusions: Lepadogaster l. purpurea is considered to be a valid species, L. purpurea (Bonnaterre, 1788), different from L. l. lepadogaster, now designated L. lepadogaster (Bonnaterre, 1788). L. zebrina was found to be a synonym of L. lepadogaster. The two newly defined species were found to be in sympatry at Madeira and the Canary islands, the Atlantic coast of the Iberian Peninsula, and the Mediterranean at least as far as Genoa (Italy). Diagnostic characters and a list of synonyms are provided. (C) 2002 The Linnean Society of London, Biological Journal of the Linnean Society, 2002, 76, 327-338
In quest of contact: phylogeography of helmeted terrapins (Pelomedusa galeata, P. subrufa sensu stricto)
Based on rangewide sampling and three mitochondrial and two nuclear markers
(together up to 1,850 bp and 1,840 bp, respectively), we examine the phylogeography
of two helmeted terrapin species (Pelomedusa galeata and P. subrufa sensu stricto) and
infer shifts of climatically suitable spaces since the Last Glacial Maximum using a
modeling approach. Whilst P. galeata displays significant phylogeographic structuring
across its range and consists of two deeply divergent lineages that could represent
distinct species, P. subrufa shows no obvious phylogeographic differentiation. This
seems to be related to historically stable or fluctuating ranges. One of the lineages
within P. galeata appears to be confined to the westernmost, winter-rainfall region
of South Africa and deserves special conservational attention due to the scarcity of
surface water. The other lineage is distributed further east and is differentiated in three
weakly supported subclades with parapatric distribution; one occurring inland, and
two along the south and east coasts, respectively. As far as is known, P. subrufa occurs
in South Africa only in the northeast of the country (Limpopo, Mpumalanga) and we
report the species for the first time from the Lapalala Wilderness Area in the Waterberg
region (Limpopo), approximately 350 km further west than previously recorded. We
confirmed the occurrence of P. galeata only 80 km south of Lapalala. Thus, a sympatric
occurrence of P. galeata and P. subrufa is possible. Another putative contact zone, for
the two lineages within P. galeata, must be located in the Western Cape region, and
further contact zones are likely for the eastern subclades within P. galeata. The nuclear
loci provided no evidence for gene flow across taxa or genetic clusters within taxa.
Future investigations should use denser sampling from putative contact zones and
more nuclear markers to re-examine this situation. Despite few phylogeographic studies
published for southern African biota, it seems likely that differentiation follows general
rules, and that climate and physiographic barriers (e.g., the Great Escarpment) have
shaped phylogeographic patterns
Migration and diving behavior of Centrophorus squamosus in the NE Atlantic. Combining electronic tagging and Argo hydrography to infer deep ocean trajectories
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Shark fossil diversity (Squalomorphii, Squatinomorphii, and Galeomorphii) from the Langhian of Brielas (Lower Tagus Basin, Portugal)
The fossiliferous marine Miocene sediments of the Lower Tagus Basin (Portugal) present
a great diversity of Chondrichthyes forms. The current study focuses on the fossil
sharks from the Langhian Vc unit of the Brielas section, located in the SetĂșbal
Peninsula. A total of 384 isolated fossil teeth were analysed and ascribed to 17 species from the Orders Hexanchiformes, Squaliformes, Squatiniformes, Lamniformes,
and Carcharhiniformes. Centrophorus granulosus and Iago angustidens are described
for the first time in Portuguese sediments, whereas Pachyscyllium dachiardii and
Rhizoprionodon ficheuri represent only their second reported occurrence. Galeorhinus
goncalvesi was already known from the Portuguese uppermost Miocene (Alvalade
Basin), but it is now recognized in older sediments. Furthermore, the new material
seems to include the first reported occurrence of Hexanchus cf. agassizi in Miocene
sediments. As a whole, these new findings support the previous palaeoenvironment
characterization of a warm infralittoral setting gradually deepening to a circalittoral
one, where seasonal upwelling phenomena could have occurred
A taxonomic bibliography of the South American snakes of the Crotalus durissus complex (Serpentes, Viperidae)
Rapid Access to Oxindoles by the Combined Use of an Ugi Four-Component Reaction and a Microwave-Assisted Intramolecular BuchwaldâHartwig Amidation Reaction.
Encyclopedie Methodique ... : Tableau des Trois Regnes de la Nature ... Erpetologie
ContĂ©n: Tableau ... de Ophiologie, par M. l'AbbĂ© Bonnanterre, Paris Chez Panckoucke, 1789, 76 p., 4Âș, Tableau ... Reptiles ... 7, 6, 12, A p+ 42 lĂĄ
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