Cryptic species and taxonomic troubles: a rebuttal of the systematic treatment of the Asian ladies’ tresses orchids (Spiranthes species; Orchidaceae) by Pace et al. (2019)

2020 ◽  
Vol 194 (3) ◽  
pp. 375-381
Author(s):  
Siddharthan Surveswaran ◽  
Vinita Gowda ◽  
Mei Sun
Keyword(s):  
Cryptic Species ◽  
Species Complex ◽  
Molecular Phylogenetics ◽  
Molecular Data ◽  
Integrative Analysis ◽  
Botanical Nomenclature ◽  
Systematic Treatment ◽  
Linnean Society ◽  
Research Article ◽  
Spiranthes Sinensis

Abstract In a recent research article by Pace et al. (2019), the authors claimed to have used information from phenology, morphology and molecular phylogenetics in their nomenclatural review of the Spiranthes sinensis complex. However, there are several scientific and botanical nomenclature issues with the Pace et al. (2019) paper in addition to its many errors and misinformation, which can be severely misleading and have the potential to affect our understanding of the highly complex Asian Spiranthes group. Here, we compare and critique their study in light of our study published prior to the article in the Botanical Journal of the Linnean Society. We suggest that the authors should have resorted to improved and new molecular data and a truly integrative analysis to support: (1) re-circumscription of the S. sinensis species complex for each of the six species they recognized, and the treatment of S. hongkongensis as a hybrid; and (2) all the new synonymies they proposed for Asian Spiranthes.

scholarly journals A new cryptic species of ground-dwelling Hemidactylus (Squamata: Gekkonidae) from southern India

2018 ◽  
Vol 17 (2) ◽  
pp. 169-180 ◽  
Author(s):  
Zeeshan A. Mirza
Keyword(s):  
New Species ◽  
Cryptic Species ◽  
Species Complex ◽  
Molecular Data ◽  
Southern India ◽  
Morphological Data ◽  
Mitochondrial Cytochrome B ◽  
Karnataka State ◽  
Mitochondrial Cytochrome B Gene ◽  
A New Species

A new cryptic species of ground-dwelling Hemidactylus (Squamata: Gekkonidae) from southern India. Recently collected specimens of a gecko resembling Hemidactylus reticulatus from northern Karnataka State in southwestern India led me to investigate variation in the species with regards to its morphology and molecular divergence. Results based on existing museum material, combined with molecular data for the mitochondrial cytochrome b gene support the presence of cryptic species within the broadly distributed H. reticulatus complex. Here, I describe a new species of Hemidactylus from northern Karnataka as the frst contribution in resolving the species complex. The integration of molecular and morphological data supports the distinctness of the new species described herein.

scholarly journals The Bostrychia tenella species complex: Morphospecies and genetic cryptic species with resurrection of B. binderi

2021 ◽  
Author(s):  
Giuseppe Zuccarello ◽  
N Muangmai ◽  
Maren Preuss ◽  
LB Sanchez ◽  
SL De Göer ◽  
...  
Keyword(s):  
Cryptic Species ◽  
Morphological Variation ◽  
Species Complex ◽  
Type Specimen ◽  
Molecular Data ◽  
Molecular Evidence ◽  
Variable Species ◽  
Morphological Differences ◽  
Multiple Species ◽  
Genetic Species

© 2015 International Phycological Society. The question of whether morphological differences observed in specimens is due to multiple species or one variable species has always caused problems for taxonomists. The most recent taxonomic treatment of the 'Bostrychia tenella species complex' suggested that much of the morphological variation represented a single highly variable entity. We used molecular data from all three genomes to clarify the phylogeny, species status and phylogeography of samples collected worldwide and also in sympatry of this complex. Our data strongly support five genetic species in this complex, but only three morphological entities were recognized. The first, divided into two genetic species, fits characters associated with B. binderi, occasionally possessing short monosiphonous determinate laterals but lacking them most of the time. We therefore resurrect B. binderi, even though we could not assign a name to either of the two genetic species, as we are missing molecular evidence from the type specimen. One genetic species was morphologically recognized as B. montagnei. Another lineage consisted of the two genetic species that fall into a new circumscription of B. tenella, with long monosiphonous determinate laterals. Again we were unable to assign either of these two lineages to a type, nor could we find morphological differences between the two lineages. Many of the genetic species have worldwide distributions, except for B. montagnei, which appears to be restricted to the Americas. Our molecular-assisted taxonomy has helped clarify some of the morphological variation within the B. tenella species complex into three named species, but two cryptic species were still recognized that remain morphologically cryptic. This is an Accepted Manuscript of an article published by Taylor & Francis in 'Phycologia' on 2015-05-01, available online: https://www.tandfonline.com/10.2216/15-005.1.

scholarly journals The Bostrychia tenella species complex: Morphospecies and genetic cryptic species with resurrection of B. binderi

2021 ◽  
Author(s):  
Giuseppe Zuccarello ◽  
N Muangmai ◽  
Maren Preuss ◽  
LB Sanchez ◽  
SL De Göer ◽  
...  
Keyword(s):  
Cryptic Species ◽  
Morphological Variation ◽  
Species Complex ◽  
Type Specimen ◽  
Molecular Data ◽  
Molecular Evidence ◽  
Variable Species ◽  
Morphological Differences ◽  
Multiple Species ◽  
Genetic Species

© 2015 International Phycological Society. The question of whether morphological differences observed in specimens is due to multiple species or one variable species has always caused problems for taxonomists. The most recent taxonomic treatment of the 'Bostrychia tenella species complex' suggested that much of the morphological variation represented a single highly variable entity. We used molecular data from all three genomes to clarify the phylogeny, species status and phylogeography of samples collected worldwide and also in sympatry of this complex. Our data strongly support five genetic species in this complex, but only three morphological entities were recognized. The first, divided into two genetic species, fits characters associated with B. binderi, occasionally possessing short monosiphonous determinate laterals but lacking them most of the time. We therefore resurrect B. binderi, even though we could not assign a name to either of the two genetic species, as we are missing molecular evidence from the type specimen. One genetic species was morphologically recognized as B. montagnei. Another lineage consisted of the two genetic species that fall into a new circumscription of B. tenella, with long monosiphonous determinate laterals. Again we were unable to assign either of these two lineages to a type, nor could we find morphological differences between the two lineages. Many of the genetic species have worldwide distributions, except for B. montagnei, which appears to be restricted to the Americas. Our molecular-assisted taxonomy has helped clarify some of the morphological variation within the B. tenella species complex into three named species, but two cryptic species were still recognized that remain morphologically cryptic. This is an Accepted Manuscript of an article published by Taylor & Francis in 'Phycologia' on 2015-05-01, available online: https://www.tandfonline.com/10.2216/15-005.1.

Identification of sibling species in the genus Eucyclops from water-bodies of Ukraine and Russia using crossbreeding studies

2014 ◽  
Vol 25 (1-2) ◽  
pp. 61-68 ◽  
Author(s):  
V. I. Monchenko ◽  
L. P. Gaponova ◽  
V. R. Alekseev
Keyword(s):  
Cryptic Species ◽  
River Basin ◽  
Black Sea ◽  
Species Complex ◽  
River Basins ◽  
Water Bodies ◽  
Similar Species ◽  
Basin Water ◽  
Different Populations ◽  
Baltic Sea Basin

Crossbreeding experiments were used to estimate cryptic species in water bodies of Ukraine and Russia because the most useful criterion in species independence is reproductive isolation. The problem of cryptic species in the genus Eucyclops was examined using interpopulation crosses of populations collected from Baltic Sea basin (pond of Strelka river basin) and Black Sea basin (water-reservoires of Dnieper, Dniester and Danube rivers basins). The results of reciprocal crosses in Eucyclops serrulatus-group are shown that E. serrulatus from different populations but from water bodies belonging to the same river basin crossed each others successfully. The interpopulation crosses of E. serrulatus populations collected from different river basins (Dnipro, Danube and Dniester river basins) were sterile. In this group of experiments we assigned evidence of sterility to four categories: 1) incomplete copulation or absence of copulation; 2) nonviable eggs; 3) absence of egg membranes or egg sacs 4) empty egg membranes. These crossbreeding studies suggest the presence of cryptic species in the E. serrulatus inhabiting ecologically different populations in many parts of its range. The same crossbreeding experiments were carries out between Eucyclops serrulatus and morphological similar species – Eucyclops macruroides from Baltic and Black Sea basins. The reciprocal crossings between these two species were sterile. Thus taxonomic heterogeneity among species of genus Eucyclops lower in E. macruroides than in E. serrulatus. The interpopulation crosses of E. macruroides populations collected from distant part of range were fertile. These crossbreeding studies suggest that E. macruroides species complex was evaluated as more stable than E. serrulatus species complex.

scholarly journals Chemical Fingerprinting of Cryptic Species and Genetic Lineages of Aneura pinguis (L.) Dumort. (Marchantiophyta, Metzgeriidae)

Molecules ◽  
2021 ◽  
Vol 26 (4) ◽  
pp. 1180
Author(s):  
Rafał Wawrzyniak ◽  
Wiesław Wasiak ◽  
Beata Jasiewicz ◽  
Alina Bączkiewicz ◽  
Katarzyna Buczkowska
Keyword(s):  
Cluster Analysis ◽  
Cryptic Species ◽  
Plant Material ◽  
Chemical Constituents ◽  
Principal Component ◽  
Molecular Data ◽  
Rapid Identification ◽  
Multivariate Statistical ◽  
Genetic Lineages ◽  
Marker Compounds

Aneura pinguis (L.) Dumort. is a representative of the simple thalloid liverworts, one of the three main types of liverwort gametophytes. According to classical taxonomy, A. pinguis represents one morphologically variable species; however, genetic data reveal that this species is a complex consisting of 10 cryptic species (named by letters from A to J), of which four are further subdivided into two or three evolutionary lineages. The objective of this work was to develop an efficient method for the characterisation of plant material using marker compounds. The volatile chemical constituents of cryptic species within the liverwort A. pinguis were analysed by GC-MS. The compounds were isolated from plant material using the HS-SPME technique. Of the 66 compounds examined, 40 were identified. Of these 40 compounds, nine were selected for use as marker compounds of individual cryptic species of A. pinguis. A guide was then developed that clarified how these markers could be used for the rapid identification of the genetic lineages of A. pinguis. Multivariate statistical analyses (principal component and cluster analysis) revealed that the chemical compounds in A. pinguis made it possible to distinguish individual cryptic species (including genetic lineages), with the exception of cryptic species G and H. The classification of samples based on the volatile compounds by cluster analysis reflected phylogenetic relationships between cryptic species and genetic lineages of A. pinguis revealed based on molecular data.

Multiple cryptic species with divergent substrate affinities in the Serpula himantioides species complex

2011 ◽  
Vol 115 (1) ◽  
pp. 54-61 ◽  
Author(s):  
Tor Carlsen ◽  
Ingeborg Bjorvand Engh ◽  
Cony Decock ◽  
Mario Rajchenberg ◽  
Håvard Kauserud
Keyword(s):  
Cryptic Species ◽  
Species Complex ◽  
Substrate Affinities

Description of Three Pristionchus Species (Nematoda: Diplogastridae) from Japan that Form a Cryptic Species Complex with the Model Organism P. pacificus

2012 ◽  
Vol 29 (6) ◽  
pp. 403 ◽  
Author(s):  
Natsumi Kanzaki ◽  
Erik J. Ragsdale ◽  
Matthias Herrmann ◽  
Werner E. Mayer ◽  
Ralf J. Sommer
Keyword(s):  
Cryptic Species ◽  
Species Complex ◽  
Model Organism ◽  
Cryptic Species Complex

Integrating molecular and morphological approaches for characterizing parasite cryptic species: implications for parasitology

Parasitology ◽  
2011 ◽  
Vol 138 (13) ◽  
pp. 1688-1709 ◽  
Author(s):  
STEVEN A. NADLER ◽  
GERARDO PÉREZ-PONCE DE LEÓN
Keyword(s):  
Cryptic Species ◽  
Applied Research ◽  
Molecular Data ◽  
Theory And Practice ◽  
Parasitic Diseases ◽  
Advantages And Disadvantages ◽  
Research Programmes ◽  
Parasite Biodiversity ◽  
Operational Practices ◽  
Methodological Considerations

SUMMARYHerein we review theoretical and methodological considerations important for finding and delimiting cryptic species of parasites (species that are difficult to recognize using traditional systematic methods). Applications of molecular data in empirical investigations of cryptic species are discussed from an historical perspective, and we evaluate advantages and disadvantages of approaches that have been used to date. Developments concerning the theory and practice of species delimitation are emphasized because theory is critical to interpretation of data. The advantages and disadvantages of different molecular methodologies, including the number and kind of loci, are discussed relative to tree-based approaches for detecting and delimiting cryptic species. We conclude by discussing some implications that cryptic species have for research programmes in parasitology, emphasizing that careful attention to the theory and operational practices involved in finding, delimiting, and describing new species (including cryptic species) is essential, not only for fully characterizing parasite biodiversity and broader aspects of comparative biology such as systematics, evolution, ecology and biogeography, but to applied research efforts that strive to improve development and understanding of epidemiology, diagnostics, control and potential eradication of parasitic diseases.

scholarly journals Colouration, chaetotaxy and molecular data provide species-level resolution in a species complex of Dicranocentrus (Collembola : Entomobryidae)

2018 ◽  
Vol 32 (6) ◽  
pp. 1298 ◽  
Author(s):  
Feng Zhang ◽  
Daoyuan Yu ◽  
Mark I. Stevens ◽  
Yinhuan Ding
Keyword(s):  
Species Complex ◽  
Instar Larva ◽  
Molecular Data ◽  
Integrative Taxonomy ◽  
Species Level ◽  
Integrative Approach ◽  
Gene Markers ◽  
Late Neogene ◽  
Taxonomic Approach ◽  
Colour Patterns

Integrative taxonomic approaches are increasingly providing species-level resolution to ‘cryptic’ diversity. In the absence of an integrative taxonomic approach, formal species validation is often lacking because of inadequate morphological diagnoses. Colouration and chaetotaxy are the most commonly used characters in collembolan taxonomy but can cause confusion in species diagnoses because these characters often have large intraspecific variation. Here, we take an integrative approach to the genus Dicranocentrus in China where four species have been previously recognised, but several members of the genus have been morphologically grouped as a species complex based on having paired outer teeth on unguis and seven colour patterns. Molecular delimitations based on distance- and evolutionary models recovered four candidate lineages from three gene markers and revealed that speciation events likely occurred during the late Neogene (4–13million years ago). Comparison of intact dorsal chaetotaxy, whose homologies were erected on the basis of first instar larva, further validated these candidates as formal species: D. gaoligongensis, sp. nov., D. similis, sp. nov., D. pallidus, sp. nov. and D. varicolor, sp. nov., and increase the number of Dicranocentrus species from China to eight. Our study further highlights the importance of adequate taxonomy in linking morphological and molecular characters within integrative taxonomy.

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