scholarly journals Coexistence, distribution patterns and habitat utilization of the sibling species complex Eurytemora affinis in the St Lawrence estuarine transition zone

2014 ◽  
Vol 36 (5) ◽  
pp. 1247-1261 ◽  
Author(s):  
J.-B. Favier ◽  
G. Winkler
Keyword(s):  
Transition Zone ◽  
Sibling Species ◽  
Species Complex ◽  
Distribution Patterns ◽  
Habitat Utilization ◽  
Eurytemora Affinis

scholarly journals Genetic and Morphological Evidence to Split the Coris julis Species Complex (Teleostei: Labridae) Into Two Sibling Species: Resurrection of Coris melanura (Lowe, 1839) Redescription of Coris julis (Linnaeus, 1758)

2021 ◽  
Vol 8 ◽  
Author(s):  
Sergio Ramírez-Amaro ◽  
Francesc Ordines ◽  
Ronald Fricke ◽  
Ignacio Ruiz-Jarabo ◽  
Ignacio Bolado ◽  
...  
Keyword(s):  
Sibling Species ◽  
Species Complex ◽  
Secondary Phase ◽  
Distribution Patterns ◽  
Western Mediterranean ◽  
Primary Phase ◽  
Valid Species ◽  
Morphological Evidence ◽  
Large Variability ◽  
Mediterranean Populations

The genus Coris contains 28 valid species, most of them with an Indo-Pacific distribution and only two species recognized from the eastern Atlantic: Coris atlantica and C. julis. This last species has a large variability in its coloration, which caused that during the first half of XIX century the sexes were considered as different species. Two liveries have been described for C. julis: (i) primary or “giofredi,” which corresponds to females and primary-phase males and is considered common for Atlantic and Mediterranean populations; and (ii) the secondary or “julis” which corresponds to secondary-phase males, which is different for Atlantic and Mediterranean populations. In this study we demonstrate the existence of two sibling species within the C. julis species complex. Morphological and molecular analyses showed that this species complex is composed of two species: (i) C. julis, distributed mainly in the Mediterranean, from which the species was originally described; and (ii) C. melanura, a species described by Lowe in 1839 which is resurrected here, mainly distributed in the eastern Atlantic and western Mediterranean. We also discuss the possible speciation event to understand the contemporary distribution patterns of Coris species in the eastern Atlantic and Mediterranean.

SYSTEMATICS OF THE TRICHADENOTECNUM ALEXANDERAE SPECIES COMPLEX (PSOCOPTERA: PSOCIDAE) BASED ON AN INVESTIGATION OF MODES OF REPRODUCTION AND MORPHOLOGY

1983 ◽  
Vol 115 (10) ◽  
pp. 1329-1354 ◽  
Author(s):  
B. W. Betz
Keyword(s):  
Life History ◽  
North America ◽  
Sibling Species ◽  
Species Complex ◽  
Morphological Analysis ◽  
Geographic Range ◽  
Eastern North America ◽  
Facultative Parthenogenesis

AbstractTrichadenotecnum alexanderae Sommerman is shown to represent one biparental (= euphrasic) species capable of facultative parthenogenesis (thelytoky) and three uniparental (= obligatorily parthenogenetic) sibling species, as determined by tests for mating, life history observations, and morphological analysis of specimens over the geographic range of the species complex. The name T. alexanderae is restricted to the biparental species because the holotype is a male. The three uniparental species are here named and described as T. castum n. sp., T. merum n. sp., and T. innuptum n. sp. The female of T. alexanderae is redescribed to allow its separation from the three uniparental species. A key to females of the species complex is supplied. All three uniparental species were derived from the biparental ancestor of T. alexanderae. Most collections of populations represented only by females consist of one or more uniparental species. Facultative parthenogenesis is shown to maintain a population of T. alexanderae through one generation only. The biparental species is found not to be restricted geographically to a relictual or peripheral range within the species complex, but to occupy a rather wide, north-temperate distribution across eastern North America.

scholarly journals Biogeographic and species richness patterns of Gastropoda on the southwestern Atlantic

1999 ◽  
Vol 59 (4) ◽  
pp. 567-575 ◽  
Author(s):  
S. R. FLOETER ◽  
A. SOARES-GOMES
Keyword(s):  
Species Richness ◽  
Transition Zone ◽  
Rio Grande ◽  
Distribution Patterns ◽  
Southwestern Atlantic ◽  
Rio Grande Do Sul ◽  
Biogeographic Province ◽  
Number Of Species ◽  
Richness Patterns ◽  
The Tropics

Patterns of richness and biogeography of Gastropoda molluscs were determined based on lists of species from five sites along the southwestern Atlantic. The analysis of the distribution patterns of these sites confirmed the existence of a broader transition zone between southern Espírito Santo State (21°S) and Rio Grande do Sul State (32°S). This zone is very heterogeneous, presenting a low endemism rate and a significant number of species common to the near provinces, and does not show enough consistency to be considered as an independent biogeographic province as proposed by Palacio (1980). Observing the distribution of species along the southwestern Atlantic we find an increase in the proportion of species with greatest latitudinal ranges (occurring from the tropics to Patagonia) from lowest to highest latitudes, following Rappoport's rule.

Chromosome, morphometric and breeding system studies in the Stylidium caricifolium species complex (Stylidiaceae)

1981 ◽  
Vol 29 (4) ◽  
pp. 397 ◽  
Author(s):  
DJ Coates
Keyword(s):  
Transition Zone ◽  
Western Australia ◽  
Breeding System ◽  
Species Complex ◽  
Leaf Morphology ◽  
Evolutionary Relationships ◽  
Geographic Patterns ◽  
Floral Characters ◽  
Ecological Transition

Evolutionary relationships among the five species in the Stylidium caricifolium species complex were investigated by chromosome, morphometric and breeding system studies. Marked interspecific chromosome differences were found between all five species and chromosomally polymorphic individuals detected in populations of S. affine, S. caricifolium and S, sp. 2. In addition, chromosomal and morphological intermediates between S. affine and S. caricifolium were found in a region corresponding to an ecological transition zone between the wheat belt and Darling Scarp vegetation systems in southern Western Australia. The origin of these transition-zone forms, although conjectural at this stage, is discussed in the light of information available from chromosome studies. Morphometric studies demonstrated that S. affine, S. sp. 1 and S. sp. 2 can readily be distinguished from each other and from S. nungarinense and S. caricifolium. The last two species, although not detectably different in the floral characters measured, can be separated on leaf morphology. Breeding system studies suggested that all species with the exception of S. affine and S. caricifolium are effectively isolated from each other reproductively. The possible significance of chromosome repatterning and eco-geographic patterns in the evolution of the S. caricifolium species complex is discussed.

scholarly journals Alterations and Interchange of Morphometric Characters in Different Life Cycle Stages with Reference to Genomic Variations of Anopheles subpictus (Diptera; Culicidae) Sibling Species Complex in Sri Lanka

Insects ◽  
2018 ◽  
Vol 9 (3) ◽  
pp. 89 ◽  
Author(s):  
Dona Jayatunga ◽  
Iresha Harischandra ◽  
Naduviladath Chandrasekharan ◽  
Nissanka de Silva
Keyword(s):  
Life Cycle ◽  
Sri Lanka ◽  
Sibling Species ◽  
Species Complex ◽  
Morphological Characters ◽  
Anopheles Subpictus ◽  
Pupal Exuviae ◽  
Morphological Variations ◽  
Genomic Variations ◽  
Life Cycle Stages

The species complex of the mosquito Anopheles subpictus is designated by the sibling species A–D, depending on morphological characters of life cycle stages and variations in polytene chromosomes. However, morphological aberrations in the life cycle stages make the identification of sibling species uncertain and imprecise. The objective of the present study is to determine the suitability of morphological variations of sibling species and their genomic variations to identify the sibling species status of an An. subpictus population in Sri Lanka. Life cycle stages of larvae, pupal exuviae, and adults were examined for previously reported distinctive morphological features. Five nuclear and mitochondrial genome regions, including the Internal transcribed spacer 2 (ITS2) region, D3 region, white gene, cytochrome c oxidase I (COI), and Cytochrome b (Cyt-b), were sequenced and analyzed for variations. The eggs changed their distinct sibling morphological characters during metamorphosis (89.33%). The larvae, pupal exuviae, and adult stages showed deviation from their sibling characters by 26.10%, 19.71%, and 15.87%, respectively. However, all the species from the analysis shared two distinct sequence types for all regions, regardless of the morphological variations. In conclusion, the An. subpictus sibling species complex in Sri Lanka is not identifiable using morphological characters due to variations, and the genomic variations are independent from the morphological variations.

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