Solution of taxonomic status of Unio mongolicus Middendorff, 1851 (Bivalvia: Unionidae) from the type locality in Transbaikalia and history of its taxonomy

2019 ◽  
Vol 29 (1) ◽  
pp. 55-70
Author(s):  
O. K. Klishko ◽  
M. Lopes-Lima ◽  
E. Froufe ◽  
A. E. Bogan
Keyword(s):  
Taxonomic Status ◽  
Type Specimen ◽  
Shell Morphology ◽  
Type Locality ◽  
Coi Gene ◽  
Mountain Stream ◽  
Past Century ◽  
Amur River Basin ◽  
Similar Species ◽  
History Of

Unio mongolicus Middendorff, 1851 (Bivalvia: Unionidae) was described from Gorbitza mountain stream (in the east of Trans-Baikal Territory, Russia) and the taxonomy has changed over the past century and a half. A specimen of Middendorffinaia mongolica from the Gorbitza stream collected 160 years later is a match with the type illustration of Unio mongolicus from the type locality. Comparison of the shell morphology of the type specimen of U. mongolicus with the modern specimen collected from this location, combined with our analyses of molecular, anatomical and conchological data of M. cf. mongolica species from rivers of the Upper Amur River Basin and the far eastern Russia, revealed that these taxa all belong to a single polymorphic species. The molecular analysis of the COI gene fragment of mtDNA of examined Comparatory Species assigned to Middendorffinaia Moskvicheva et Starobogatov, 1973 confirmed they are only intraspecific forms of M. mongolica. Morphological and genetic distances between M. mongolica and Nodularia douglasiae (Griffith et Pidgeon, 1833) confirmed their assignment to two independent genera. Based on conchological characteristics and anatomical features, the differences between morphologically similar species M. mongolica, N. douglasiae and Unio crassus Retzius, 1788 were determined. History of the taxonomic changes for Unio mongolicus is discussed.

Taxonomic revision of the genus Eulimella (Gastropoda, Pyramidellidae) from Brazil, with description of three new species

Zootaxa ◽  
2011 ◽  
Vol 3063 (1) ◽  
pp. 22 ◽  
Author(s):  
ALEXANDRE DIAS PIMENTA ◽  
FRANKLIN NOEL DOS SANTOS ◽  
RICARDO SILVA ABSALÃO
Keyword(s):  
New Species ◽  
Taxonomic Status ◽  
Taxonomic Revision ◽  
Shell Morphology ◽  
Biological Information ◽  
Brazilian Coast ◽  
Similar Species ◽  
South American Species ◽  
Western Atlantic ◽  
Three New Species

A taxonomic revision of the pyramidellid genus Eulimella from Brazil was performed based on shell morphology. The holotype of Eulimella rudis Watson, 1886 is illustrated and compared to shells from the southeast Brazilian coast, this being the first confirmed record of this species after its original description. Eulimella smithii (Verrill, 1880), previously known from northern localities in the western Atlantic, is recorded from the southwestern Atlantic, along virtually the entire Brazilian coast; it is herein considered a distinct taxon from Eulimella unifasciata (Forbes, 1844), a very similar species from the eastern Atlantic, given the lack of data on development to consider an amphi-Atlantic distribution. Three new species are described: Eulimella torquata sp. nov., diagnosed by a constriction in the middle of each teleoconch whorl caused by a strong spiral furrow, producing a bilobed whorl profile; Eulimella cylindrata sp. nov., diagnosed by a large subcylindrical teleoconch; and Eulimella ejuncida sp. nov., characterized by its very slender shell, and small protoconch with only one whorl and with an “arc” shaped suture. The shells herein identified as Eulimella cf. calva from Brazil are conchologically identical to Eulimella calva Schander, 1994, from West Africa, but their taxonomic status should remain dubious because of lack of biological information to evaluate a possible amphi-Atlantic distribution pattern. All the species studied (except Eulimella ejuncida sp. nov.) have characteristic short microscopic axial threads organized in a spiral belt, varying in position and expression among species, but usually located in the middle of each teleoconch whorl or below the suture; this characteristic is also present in some species from the eastern Atlantic. Three South American species, originally or subsequently allocated in Eulimella, are herein considered as not belonging to this genus: Eulimella argentina Doello-Jurado, 1938; Eulimella bahiensis Castellanos, 1982; and Eulimella xenohyes (Melvill & Standen, 1912). The holotype of Eulimella lissa is illustrated with SEM micrographs.

scholarly journals A Nation-wide Phylogenetic and Phylogeographic Investigation of the Endemic New Zealand Oyster Borers, Haustrum scobina and Haustrum albomarginatum

2021 ◽  
Author(s):  
Seamus O'Mahony
Keyword(s):  
New Zealand ◽  
Dna Sequences ◽  
Haplotype Diversity ◽  
Shell Morphology ◽  
Ice Age ◽  
Coi Gene ◽  
Rrna Gene ◽  
Similar Species ◽  
Migration Route ◽  
Outgroup Species

The endemic New Zealand sea snails Haustrum scobina and Haustrum albomarginatum are rocky shore intertidal dogwhelks of the Muricidae family. They have direct developing young and are carnivores. Their radula is used to drill into the shells of their prey, and they are commonly referred to as oyster borers. The taxonomic status of these species is still unresolved and therefore the name Haustrum scobina sensu lato is used.<br><br>The overall goal of this thesis research was to investigate the phylogeny and phylogeography of Haustrum scobina sensu lato using mitochondrial DNA sequences. Comparisons made to phylogeographic studies of ecologically similar species such as Cominella spp. provide an opportunity to identify the common environmental determinates of population migration route, genetic differentiation and speciation whenever similar patterns are found.<br><br>A nation-wide collection of samples was used to generate 277 new sequences from a 610 bp portion of the cytochrome c oxidase subunit I (COI) gene. This enabled the formation of a dataset of 654 DNA sequences, which was comprised of the 277 new sequences, 16 retrieved from a published study that deposited them in GenBank, and 361 from a previous unpublished thesis study. An unexpectedly diverse phylogeny of 58 COI haplotypes from 31 sample sites was recovered. These formed three clusters using K-means clustering by pairwise mutational distance. The in-group species did not form reciprocal monophyly groups, and the expected closest outgroup species (Haustrum haustorium) appeared to be as similar to the in-group clusters as they were to each other. A dataset of 27 DNA sequences from an 827 bp portion of the large sub-unit 28S nuclear rRNA gene was produced with the intention of corroborating the findings from the analyses of the COI dataset. This consisted of 26 new sequences and one sequence from a published study that deposited the sequence on GenBank. The expected taxonomic arrangement of Haustrum scobina sensu lato could not be matched by COI sequences due to incongruence with the 28S phylogeny and shell morphology. <br><br>The 28S dataset and shell morphology indicated there are two species in Haustrum scobina sensu lato. These are most likely Haustrum scobina and Haustrum albomarginatum, but they could not clearly be identified in the COI data. As a result, the phylogeographic certainty was limited when using the COI dataset because of the lack of clarity between the haplotypes of the two putative species. Possible reasons for the complicated COI dataset are discussed. Phylogenetic analysis of both the 28S and COI datasets did not support the expected conclusion that members of Haustrum scobina sensu lato are each other’s closest relatives. Haustrum haustorium was the expected immediate outgroup species but formed a polytomy with the in-group. A decrease in COI haplotype diversity was observed in southern samples when they were compared to the samples collected at northern locations. Taranaki sites shared a haplotype with multiple South Island sites that had no haplotype diversity. This suggested post-glacial re-colonisation of southern sites after displacement by ice-age conditions from these locations, a hypothesis consistent with results from studies of the Cominella genus. Association between Purau Bay in Lyttleton Harbour, Titahi Bay, Port Ahuriri and Kawau Island with no associated haplotypes between these locations suggested human-mediated translocation events. A genetic disjunction was also apparent between the south Wellington/Wairarapa coast and the eastern Wairarapa coast. This pattern was consistent with one study of Cominella maculosa and other studies have attributed similar patterns of other species in the region to recent uplift events affecting coastal community composition. The phylogeny of Haustrum scobina sensu lato will require further investigation before it can be used to more confidently resolve the phylogeographic history of the species.

Is Genetic Continuity Between Anopheles sinensis (Diptera: Culicidae) and its Sibling Species Due to Gene Introgression or Incomplete Speciation?

2019 ◽  
Vol 56 (5) ◽  
pp. 1239-1252
Author(s):  
Gang Wang ◽  
Xiaoxia Guo ◽  
Fenglin Song ◽  
Wei Zheng ◽  
Weilong Tan ◽  
...  
Keyword(s):  
Gene Flow ◽  
Malaria Vector ◽  
Taxonomic Status ◽  
Anopheles Sinensis ◽  
Natural Hybridization ◽  
Coi Gene ◽  
Valid Species ◽  
Similar Species ◽  
Potential Vector ◽  
Genetic Continuity

Abstract The Anopheles mosquito Hyrcanus Group is widely distributed geographically across both Palearctic and Oriental regions and comprises 26 valid species. Although the species Anopheles sinensis Wiedemann (1828) is the most common in China and has a low potential vector rank, it has nevertheless long been thought to be an important natural malaria vector within the middle and lower reaches of the Yangtze River. A number of previous research studies have found evidence to support the occurrence of natural hybridization between An. sinensis and Anopheles kleini Rueda, 2005 (a competent malaria vector). We, therefore, collected a sample series of An. sinensis and morphologically similar species across China and undertook ribosomal and mitochondrial DNA analyses in order to assess genetic differentiation (Fst) and gene flow (Nm) amongst different groups. This enabled us to evaluate divergence times between morphologically similar species using the cytochrome oxidase I (COI) gene. The results of this study reveal significant genetic similarities between An. sinensis, An. kleini, and Anopheles belenrae Rueda, 2005 and therefore imply that correct molecular identifications will require additional molecular markers. As results also reveal the presence of gene flow between these three species, their taxonomic status will require further work. Data suggest that An. kleini is the most basal of the three species, while An. sinensis and An. belenrae share the closest genetic relationship.

scholarly journals A Nation-wide Phylogenetic and Phylogeographic Investigation of the Endemic New Zealand Oyster Borers, Haustrum scobina and Haustrum albomarginatum

2021 ◽  
Author(s):  
Seamus O'Mahony
Keyword(s):  
New Zealand ◽  
Dna Sequences ◽  
Haplotype Diversity ◽  
Shell Morphology ◽  
Ice Age ◽  
Coi Gene ◽  
Rrna Gene ◽  
Similar Species ◽  
Migration Route ◽  
Outgroup Species

The endemic New Zealand sea snails Haustrum scobina and Haustrum albomarginatum are rocky shore intertidal dogwhelks of the Muricidae family. They have direct developing young and are carnivores. Their radula is used to drill into the shells of their prey, and they are commonly referred to as oyster borers. The taxonomic status of these species is still unresolved and therefore the name Haustrum scobina sensu lato is used.<br><br>The overall goal of this thesis research was to investigate the phylogeny and phylogeography of Haustrum scobina sensu lato using mitochondrial DNA sequences. Comparisons made to phylogeographic studies of ecologically similar species such as Cominella spp. provide an opportunity to identify the common environmental determinates of population migration route, genetic differentiation and speciation whenever similar patterns are found.<br><br>A nation-wide collection of samples was used to generate 277 new sequences from a 610 bp portion of the cytochrome c oxidase subunit I (COI) gene. This enabled the formation of a dataset of 654 DNA sequences, which was comprised of the 277 new sequences, 16 retrieved from a published study that deposited them in GenBank, and 361 from a previous unpublished thesis study. An unexpectedly diverse phylogeny of 58 COI haplotypes from 31 sample sites was recovered. These formed three clusters using K-means clustering by pairwise mutational distance. The in-group species did not form reciprocal monophyly groups, and the expected closest outgroup species (Haustrum haustorium) appeared to be as similar to the in-group clusters as they were to each other. A dataset of 27 DNA sequences from an 827 bp portion of the large sub-unit 28S nuclear rRNA gene was produced with the intention of corroborating the findings from the analyses of the COI dataset. This consisted of 26 new sequences and one sequence from a published study that deposited the sequence on GenBank. The expected taxonomic arrangement of Haustrum scobina sensu lato could not be matched by COI sequences due to incongruence with the 28S phylogeny and shell morphology. <br><br>The 28S dataset and shell morphology indicated there are two species in Haustrum scobina sensu lato. These are most likely Haustrum scobina and Haustrum albomarginatum, but they could not clearly be identified in the COI data. As a result, the phylogeographic certainty was limited when using the COI dataset because of the lack of clarity between the haplotypes of the two putative species. Possible reasons for the complicated COI dataset are discussed. Phylogenetic analysis of both the 28S and COI datasets did not support the expected conclusion that members of Haustrum scobina sensu lato are each other’s closest relatives. Haustrum haustorium was the expected immediate outgroup species but formed a polytomy with the in-group. A decrease in COI haplotype diversity was observed in southern samples when they were compared to the samples collected at northern locations. Taranaki sites shared a haplotype with multiple South Island sites that had no haplotype diversity. This suggested post-glacial re-colonisation of southern sites after displacement by ice-age conditions from these locations, a hypothesis consistent with results from studies of the Cominella genus. Association between Purau Bay in Lyttleton Harbour, Titahi Bay, Port Ahuriri and Kawau Island with no associated haplotypes between these locations suggested human-mediated translocation events. A genetic disjunction was also apparent between the south Wellington/Wairarapa coast and the eastern Wairarapa coast. This pattern was consistent with one study of Cominella maculosa and other studies have attributed similar patterns of other species in the region to recent uplift events affecting coastal community composition. The phylogeny of Haustrum scobina sensu lato will require further investigation before it can be used to more confidently resolve the phylogeographic history of the species.

Morphological conservatism of the family Naticidae (Gastropoda) through time: potential causes and consequences

Paleobiology ◽  
2021 ◽  
pp. 1-16
Author(s):  
Neha Sharma ◽  
Subhronil Mondal ◽  
Shiladri S. Das ◽  
Kanishka Bose ◽  
Sandip Saha
Keyword(s):  
Morphological Evolution ◽  
Taxonomic Status ◽  
Morphological Characters ◽  
Shell Morphology ◽  
Canonical Variate ◽  
The Family ◽  
Mode Of Life ◽  
History Of ◽  
Taxonomic Changes ◽  
The Individual

Abstract Taxonomic status of several members of the family Naticidae is extremely vague because of its simple shell morphology. Conventional taxonomic classification schemes suggest that most of the morphological characters tend to be homoplastic and exhibit convergence. Such morphological convergence complicates naticid taxonomy and makes it difficult to understand the evolutionary history of this group; several unrelated taxa are often misidentified as naticids, thereby exaggerating the actual diversity of this group. Here, we employ a standard landmark-based approach to understand the pattern of morphological evolution of this family. Ordination methods such as principal components analysis and canonical variate analysis were used to create morphospaces, and disparity was quantified using variance and range. Our results reveal that when naticids are compared with their sister taxon, Ampullinidae, the two families show significant differences in their average shapes, despite their superficial resemblances. Among naticids, although the mean shapes of the individual subfamilies are different, overall, the family Naticidae has displayed extreme morphological conservatism from the Jurassic to the Holocene. Interestingly, this conservatism has been unaffected by taxonomic changes—neither the extinction of the subfamily Gyrodinae nor the appearance of the subfamily Sininae affected this morphological conservatism. Naticids have always shown strong ecological preference toward an infaunal mode of life and strict behavioral selectivity in handling and preying upon infaunal organisms, and this ecological and behavioral conservatism could have enabled them to diversify without undergoing a change in their basic Bauplan.

scholarly journals Re-evaluation of Zospeum schaufussi von Frauenfeld, 1862 and Z. suarezi Gittenberger, 1980, including the description of two new Iberian species using Computer Tomography (CT) (Eupulmonata, Ellobioidea, Carychiidae)

ZooKeys ◽  
2019 ◽  
Vol 835 ◽  
pp. 65-86
Author(s):  
Adrienne Jochum ◽  
Carlos E. Prieto ◽  
Marian Kampschulte ◽  
Gunhild Martels ◽  
Bernhard Ruthensteiner ◽  
...  
Keyword(s):  
Computer Tomography ◽  
Taxonomic Status ◽  
Shell Morphology ◽  
Type Locality ◽  
Micro Ct ◽  
Nw Spain ◽  
Separate Species ◽  
X Ray ◽  
External Shell ◽  
First Time

The present study aims to clarify the confused taxonomy of Z.schaufussi von Frauenfeld, 1862 and Zospeumsuarezi Gittenberger, 1980. Revision of Iberian Zospeum micro snails is severely hindered by uncertainties regarding the identity of the oldest Iberian Zospeum species, Z.schaufussi von Frauenfeld, 1862. In this paper, we clarify its taxonomic status by designating a lectotype from the original syntype series and by describing its internal and external shell morphology. Using SEM-EDX, we attempt to identify the area of the type locality cave more precisely than “a cave in Spain”. The shell described and illustrated by Gittenberger (1980) as Z.schaufussi appears not to be conspecific with the lectotype shell, and is considered a separate species, Z.gittenbergeri Jochum, Prieto &amp; De Winter, sp. n. Zospeumsuarezi was described from various caves in NW Spain. Study of the type material reveals that these shells are not homogenous in shell morphology. The holotype shell of Z.suarezi is imaged here for the first time. The paratype shell, illustrated by Gittenberger (1980) from a distant, second cave, is described as Zospeumpraetermissum Jochum, Prieto &amp; De Winter, sp. n. The shell selected here as lectotype of Z.schaufussi, was also considered a paratype of Z.suarezi by Gittenberger (1980). Since this specimen is morphologically very similar to topotypic shells of Z.suarezi, the latter species is considered a junior synonym of Z.schaufussi (syn. n.). The internal shell morphology of all these taxa is described and illustrated using X-ray Micro Computer Tomography (Micro-CT).

scholarly journals Gnathopalystes aureolus (He & Hu, 2000): new combination for Pseudopoda aureola (Araneae, Sparassidae), with the first description of the female from Hainan Island, China

ZooKeys ◽  
2019 ◽  
Vol 817 ◽  
pp. 95-103
Author(s):  
Wei Ding ◽  
Yang Zhong ◽  
Jie Liu
Keyword(s):  
Taxonomic Status ◽  
Hainan Island ◽  
Type Specimen ◽  
Type Locality ◽  
New Combination ◽  
Posterior Teeth ◽  
Median Septum ◽  
Fresh Material ◽  
First Time

The taxonomic status of Pseudopodaaureola (He &amp; Hu, 2000) is revised based on the re-examination of the type specimen and fresh material collected from the type locality. The cheliceral dentition, with a large denticle field between two anterior and three posterior teeth, the male palps with simple RTA arising distally, narrow, not filiform embolus and sheet-like membranous conductor, and the female epigyne with a visible median septum indicate that the species does not belong to Pseudopoda or to the originally assigned genus, Heteropoda. Based on these characters, the species is here transferred to Gnathopalystes. The male is redescribed and the female is described and illustrated for the first time.

An annotated checklist of mesoplodont whale species (Cetacea, Ziphiidae) discovered during the nineteenth century

2015 ◽  
Vol 42 (2) ◽  
pp. 226-235 ◽  
Author(s):  
G. N. H. Waller
Keyword(s):  
Nineteenth Century ◽  
Additional Data ◽  
Original Description ◽  
Type Specimen ◽  
External Morphology ◽  
Type Locality ◽  
Type Material ◽  
Beaked Whale ◽  
Registration Number ◽  
Annotated Checklist

Eight species of mesoplodont whales (genus Mesoplodon Gervais, 1850) named during the nineteenth century are based on valid descriptions. A checklist with the original description and type material for each of these species is provided. Additional data given may include type locality and illustrative sources, type material holding institution and type registration number(s). The only type specimen for which a record of external morphology was published relates to the 1803 stranding of Sowerby's beaked whale (Mesoplodon bidens).

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