Taxonomic revision of Cypridopsis silvestrii comb. nov. (Ostracoda, Crustacea) from Patagonia, Argentina with morphometric analysis of their intraspecific shape variability and sexual dimorphism

Zootaxa ◽  
2019 ◽  
Vol 4563 (1) ◽  
pp. 83
Author(s):  
ALEJANDRA P. PÉREZ ◽  
CORINA A. COVIAGA ◽  
LORENA Y. RAMOS ◽  
JULIO LANCELOTTI ◽  
MARTA S. ALPERIN ◽  
...  
Keyword(s):  
Sexual Dimorphism ◽  
Geographical Distribution ◽  
Morphometric Analysis ◽  
Taxonomic Status ◽  
Taxonomic Revision ◽  
Present Contribution ◽  
Morphological Variations ◽  
Ecological Requirements ◽  
Morphometric Analyses ◽  
Southern Patagonia

In this study we redescribe an ostracod species belonging to the subfamily Cypridopsinae Kaufmann, 1900, sampled in seven localities of northern and southern Patagonia, Argentina. A new taxonomical combination is proposed, Cypridopsis silvestrii comb. nov., based on detailed description of females and the first descriptions of males. Cypridopsis silvestrii occurred on a wide geographical distribution range, from 40º to 48º S latitude, as well as broad environmental tolerance ranges. We evaluated morphological variations in two populations of C. silvestrii from northern (El Toro lake) and southern (El Sello lake) Patagonia, with contrasting limnological conditions. El Toro is a small shallow lake with high salinity waters and El Sello is a large deep lake with lower salinity. Based on morphometric analysis, our results showed intraspecific variation in valve shape and size between populations. Sexual dimorphism in El Toro population was identified through morphometric analyses. Additionally, comparison of valve outlines in living and subfossil individuals from El Toro lake allowed specimens previously described as juveniles of Eucypris fontana (Graf, 1931) to be identified as adults of C. silvestrii comb. nov. The present contribution increases knowledge of the taxonomic identity, the ecological requirements and the geographical distribution of C. silvestrii, and shows that morphometric analyses are a feasible and useful tool for exploring intraspecific shape differences and assisting in taxonomic identification. Furthermore, the results presented herein provide tools for C. silvestrii identification in paleolimnological studies, and emphasize the usefulness of studying living representatives for clarification of the taxonomic status of species widely distributed in Quaternary sediments. 

scholarly journals On two species of Riocypris (Crustacea, Ostracoda) from northern Patagonia and their relation to Eucypris fontana: implications in paleoenvironmental reconstructions

2018 ◽  
Vol 96 (8) ◽  
pp. 801-817 ◽  
Author(s):  
C.A. Coviaga ◽  
A.P. Pérez ◽  
L.Y. Ramos ◽  
P. Alvear ◽  
G.C. Cusminsky
Keyword(s):  
Sexual Dimorphism ◽  
Morphometric Analysis ◽  
Indicator Species ◽  
Taxonomic Status ◽  
Geometric Morphometric ◽  
Comparative Analyses ◽  
Northern Patagonia ◽  
Geometric Morphometric Analysis ◽  
The Individual ◽  
First Time

Two species of ostracods new to Patagonia, Argentina, are described. One of them, Riocypris whatleyi sp. nov., is described for the first time, and the second, Riocypris sarsi (Daday, 1902) comb. nov., is reallocated from genus Eucypris to genus Riocypris. Inter- and intra-specific variations in shape, size, and sexual dimorphism were evaluated based on geometric morphometric analysis. Moreover, morphological and morphometric comparative analyses were applied to re-examine living and quaternary specimens recovered from previous studies. Based on these results, a generic reassignment for the Patagonian Eucypris fontana (Jurine, 1820) into the genus Riocypris is proposed. Contributing to the knowledge on the systematic and autecology of this enigmatic species, widely distributed in Patagonia and frequently used in paleolimnological reconstructions, generates science-based evidence for their use as indicator species. Additionally, our results emphasize the usefulness of studying the living representatives (i.e., with valves and appendages) for elucidating the taxonomic status of the individual specimens, especially those present in paleontological records and used as bioproxies in paleolimnological studies.

The taxonomic status of the species of the genera Rhipicephalus Koch and Boophilus Curtice (Acarina: Ixodidae) occurring in Australia.

1965 ◽  
Vol 13 (3) ◽  
pp. 491 ◽  
Author(s):  
FHS Roberts
Keyword(s):  
Host Range ◽  
Geographical Distribution ◽  
Taxonomic Status ◽  
Taxonomic Study ◽  
Morphological Variations

A taxonomic study has been made of the species of Rhipicephalus Koch and Boophilus Curtice occurring in Australia. It was concluded that only one species of each genus is present and determination of these as R. sanguineus (Latreille) and B. microplus (Canestrini) respectively, was confirmed. A redescription is given of the male, female, nymph, and larva of each species based on Australian material, the morphological variations observed are noted, and the host range and geographical distribution are discussed.

scholarly journals Sexual dimorphism and morphometric analysis of Filopaludina martensi martensi (Gastropoda: Viviparidae)

2021 ◽  
Vol 31 (2) ◽  
pp. 87-92
Author(s):  
Weerachon Sawangproh ◽  
Chetsada Phaenark ◽  
Supatra Chunchob ◽  
Paiphan Paejaroen
Keyword(s):  
Sexual Dimorphism ◽  
Morphometric Analysis ◽  
Sexual Differences ◽  
Morphometric Analyses ◽  
Different Characteristics

Sexual dimorphism is the condition where individuals of different sex in the same species exhibit different characteristics beyond the differences in their sexual organs. In this study, individuals of a viviparid species Filopaludina martensi from the Kwai Yai River in Kanchanaburi Province (Thailand) were examined for eight shell and operculum characteristics. Sexual differences were observed in size of shell and operculum, with females being larger than males. The results indicated that morphometric analyses are useful to detect subtle differences between sexes in this species.

Morphometric analysis of two sympatric species ofPerinereis(Annelida: Nereididae) from the Brazilian coast

2015 ◽  
Vol 95 (5) ◽  
pp. 953-959 ◽  
Author(s):  
Marina Cyrino Leal Coutinho ◽  
Paulo Cesar Paiva ◽  
Cinthya Simone Gomes Santos
Keyword(s):  
Morphometric Analysis ◽  
Taxonomic Status ◽  
Sympatric Species ◽  
The Body ◽  
Brazilian Coast ◽  
Species Definition ◽  
The North ◽  
Morphometric Analyses ◽  
North Eastern ◽  
Pattern Of Variation

Species definition is not an easy task, when considering the more than 27 known species concepts. Among them, the morphospecies concept has been one of the most applied since it is based on the use of observable morphological features. Morphometry has been used to delimitate morphospecies or similar taxa complementing the morphological observations and contributing to clarify taxonomic problems. Specimens from the sympatric speciesPerinereis anderssoniandPerinereis ponteni,collected from the north-eastern to southern coast of Brazil and considered synonymous by some authors, were compared through morphometric analyses for the evaluation of their taxonomic status. Morphometric analysis indicates that notopodial cirri lengths in the median and posterior regions on the body clearly allowed differentiation between the two species. Our results indicate that the number and arrangement of paragnaths demonstrate a pattern of variation that effectively differs and could be used to discriminate these twoPerinereisspecies. This distinction was confirmed by the restricted among-population variability within each species, even when populations that are geographically very distant from each other were considered.

Taxonomic revision of Algero-Tunisian Pleurodeles (Caudata: Salamandridae) using molecular and morphological data. Revalidation of the taxon Pleurodeles nebulosus (Guichenot, 1850)

Zootaxa ◽  
2004 ◽  
Vol 488 (1) ◽  
pp. 1 ◽  
Author(s):  
SALVADOR CARRANZA ◽  
EDWARD WADE
Keyword(s):  
Mitochondrial Dna ◽  
Cytochrome B ◽  
Morphometric Analysis ◽  
Dna Sequences ◽  
Taxonomic Status ◽  
Taxonomic Revision ◽  
Morphological Data ◽  
Morphological Evidence ◽  
12S Rrna

The taxonomic status of Algero-Tunisian Pleurodeles was reanalysed in the light of new molecular and morphological evidence. Mitochondrial DNA sequences (396 bp of the cytochrome b and 369 of the 12S rRNA) and the results of the morphometric analysis, indicate that Algero-Tunisian P. poireti consists of two genetically and morphologically distinct forms. One restricted to the Edough Peninsula, and another one covering all the rest of its distribution in Algeria and Tunisia. The name P. poireti (Gervais, 1835) is restricted to the population of the Edough Peninsula, while P. nebulous (Guichenot, 1850) correctly applies to all other populations in the distribution. P. poireti originated approximately 4.2 Myr ago, probably as a result of the Edough Peninsula being a Pliocene fossil island, allowing both forms of Algero-Tunisian Pleurodeles to diverge both genetically and morphologically.

scholarly journals Sexual Dimorphism Via Palatal Vault Morphometric Analysis on A Sample Peruvian Population

2019 ◽  
pp. 217-225
Author(s):  
Karen J. Escalante-Flórez DDS ◽  
Daniel G. Suárez-Ponce DDS, MSc, PhD ◽  
Ymelda W. Velezmoro-Montes DDS, MSc
Keyword(s):  
Sexual Dimorphism ◽  
Morphometric Analysis ◽  
Cross Sectional ◽  
Morphometric Analyses ◽  
Length Measurements ◽  
Inferential Analysis ◽  
Student Test ◽  
Cross Sectional Design ◽  
Level Of Significance ◽  
Palatal Vault

Objective: Determine sexual dimorphism precision via palatal vault morphometric analysis in craniums sourced from the Laboratorio de Investigación Forense del Equipo Forense Especializado (EFE) de Ayacucho del Ministerio Público - Perú. Materials and Methods: Cross-sectional design consisting of a sample of 43 skulls with pre-established biological gender, (24 males and 19 females). Sexual dimorphism was established by means of the method proposed by Meera Jacob and co., based on palatal width and length measurements, after which the palatal index was calculated, establishing the method’s precision and accuracy. The inferential analysis was made with a level of significance of 5% through the T student test, Shapiro Wilk and Pearson’s coefficient. Results: Palatal width had a mean of 3.43 (+0.31cm) for males and 3.62 (+0.25) for females and in palatal length a mean of 5.07 (+0.44) cm. for males and 4.79 (+0.41) cm. for females is established; on palatal index, 100% of the male skulls correspond to hard narrow palate and on females 73.7% to narrow, 21% to intermediate and 5.3% to wide. Furthermore, it was determined that there were statistically significant differences between width and length of palatal vault for both genders, and a discriminating analysis formula was proposed. Conclusion: Morphometric analyses of palatal vaults establish an 83.72% precision on the estimation of sexual dimorphism.

Taxonomic Status of Calanus finmarchicus and C. glacialis (Copepoda), with Special Reference to Adult Males

1971 ◽  
Vol 28 (1) ◽  
pp. 23-30 ◽  
Author(s):  
Bruce W. Frost
Keyword(s):  
Vertical Distribution ◽  
Special Reference ◽  
Geographical Distribution ◽  
Morphometric Analysis ◽  
Taxonomic Status ◽  
Life Cycles ◽  
Calanus Finmarchicus ◽  
Adult Males ◽  
Adult Females ◽  
Taxonomic Studies

A morphometric analysis using certain taxonomic characters of adult males of Calanus finmarchicus (Gunnerus) and C. glacialis Jaschnov shows that the taxa comprise two non-overlapping clusters. Calanus finmarchicus and C. glacialis are probably reproductively isolated. Differences between the species in geographical distribution, vertical distribution, and timing of life cycles also support this conclusion. Previous taxonomic studies of adult females of the two species have yielded inconclusive results, probably because the analyses were based largely on subgeneric characters.

scholarly journals Improving the knowledge of plant potential biodiversity-ecosystem services links using maps at the regional level in Southern Patagonia

2021 ◽  
Vol 10 (1) ◽  
Author(s):  
Yamina Micaela Rosas ◽  
Pablo L. Peri ◽  
María Vanessa Lencinas ◽  
Romina Lasagno ◽  
Guillermo J. Martínez Pastur
Keyword(s):  
Ecosystem Services ◽  
Plant Species ◽  
Vegetation Index ◽  
Vascular Plant ◽  
Conservation Strategies ◽  
Cultural Ecosystem Services ◽  
Important Indicator ◽  
Ecological Requirements ◽  
Trade Offs ◽  
Southern Patagonia

Abstract Background Biodiversity supports multiple ecosystem services, whereas species loss endangers the provision of many services and affects ecosystem resilience and resistance capacity. The increase of remote sensing techniques allows to estimate biodiversity and ecosystem services supply at the landscape level in areas with low available data (e.g. Southern Patagonia). This paper evaluates the potential biodiversity and how it links with ecosystem services, based on vascular plant species across eight ecological areas. We also evaluated the habitat plant requirements and their relation with natural gradients. A total of 977 plots were used to develop habitat suitability maps based on an environmental niche factor analysis of 15 more important indicator species for each ecological area (n = 53 species) using 40 explanatory variables. Finally, these maps were combined into a single potential biodiversity map, which was linked with environmental variables and ecosystem services supply. For comparisons, data were extracted and compared through analyses of variance. Results The plant habitat requirements varied greatly among the different ecological areas, and it was possible to define groups according to its specialization and marginality indexes. The potential biodiversity map allowed us to detect coldspots in the western mountains and hotspots in southern and eastern areas. Higher biodiversity was associated to higher temperatures and normalized difference vegetation index, while lower biodiversity was related to elevation and rainfall. Potential biodiversity was closely associated with supporting and provisioning ecosystem services in shrublands and grasslands in the humid steppe, while the lowest values were related to cultural ecosystem services in Nothofagus forests. Conclusions The present study showed that plant species present remarkable differences in spatial distributions and ecological requirements, being a useful proxy for potential biodiversity modelling. Potential biodiversity values change across ecological areas allowing to identify hotspots and coldspots, a useful tool for landscape management and conservation strategies. In addition, links with ecosystem services detect potential synergies and trade-offs, where areas with the lowest potential biodiversity are related to cultural ecosystem services (e.g. aesthetic values) and areas with the greatest potential biodiversity showed threats related to productive activities (e.g. livestock).

Disentangling Astraea lobata: three new names in Astraea based on previous varieties of Croton lobatus (Euphorbiaceae)

Phytotaxa ◽  
2017 ◽  
Vol 317 (4) ◽  
pp. 297 ◽  
Author(s):  
OTÁVIO LUIS MARQUES DA SILVA ◽  
INÊS CORDEIRO
Keyword(s):  
Geographical Distribution ◽  
Geographic Distribution ◽  
Taxonomic Revision ◽  
Morphological Characters ◽  
Complex Species ◽  
Wide Geographical Distribution ◽  
As Species

Within Astraea Klotzsch (1841: 194), Astraea lobata (Linnaeus 1753: 1005) Klotzsch (1841: 194) may be considered the most taxonomically complex species due to its wide geographical distribution and the several varieties that have been proposed for this species by Müller Argoviensis (1866, 1874). In his concept, Müller Argoviensis (1866) united under Croton lobatus Linnaeus (1753: 1005) plants with 3–5-partite leaves almost as long as the petioles, subulate stipules, the bracts not well developed and ovaries with varied indumentum. In De Candolles’s Prodromus, Müller Argoviensis (1866) recognized eight varieties, maintaining this concept in the Flora Brasiliensis (Müller Argoviensis 1874) with few modifications. Morphological characters and geographical distribution support the recognition of some of these varieties as species distinct from A. lobata. As part of an undergoing taxonomic revision of Astraea, these distinct taxa must be validly published for further studies on this genus. Therefore, in this note we propose these novelties with commentaries about morphology and geographic distribution, along with photos to illustrate them and lectotypifications when necessary.

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