Eurypterida (Chelicerata) from the Welsh Borderlands, England

2006 ◽  
Vol 143 (5) ◽  
pp. 723-735 ◽  
Author(s):  
O. ERIK TETLIE
Keyword(s):  
New Genus ◽  
Posterior Part ◽  
Junior Synonym ◽  
Phylogenetic Position ◽  
Eye Position ◽  
Morphological Differences

Eurypterids from the Welsh Borderlands of England are redescribed from most available material. Hughmilleria banksii is here interpreted to represent a new genus. The poorly known Hughmilleria (?) acuminata (Salter, 1859a) is considered a junior synonym of H. banksii. Furthermore, Slimonia? stylops is suspected to be a junior synonym of Salteropterus abbreviatus, although they are not formally synonymized as the location of the only known specimen of S.? stylops is unknown. Morphological differences in carapace shape, eye position, walking leg, genital appendage and telson in H. banksii are noted compared to previous descriptions. A prosomal appendage earlier assigned to H. banksii is here assigned with caution to S. abbreviatus and the reported ‘segments’ in the posterior part of the telson of S. abbreviatus are shown to be cracks. The phylogenetic position of the new genus is inferred to lie between the Hughmilleria and the Slimonia/Salteropterus clades.

On two cephalaspid molluscs (Gastropoda: Opisthobranchia) with two gizzard plates, and description of a new genus and a new family

2016 ◽  
Vol 25 (2) ◽  
pp. 204-215 ◽  
Author(s):  
E.M. Chaban ◽  
P.V. Kijashko
Keyword(s):  
Connective Tissue ◽  
New Genus ◽  
Junior Synonym ◽  
Taxonomic Position ◽  
Monotypic Genus ◽  
Soft Body ◽  
New Family ◽  
Morphological Differences ◽  
First Time

The morphology of the soft body of two unique cephalaspid species, Eоscaphander fragilis Habe, 1952 and Cylichna magna Lemche, 1941, having two gizzard plates in their gizzards has been studied. Taxonomic position of the both species is discussed. The morphology of E. fragilis is described and illustrated for the first time. The species belongs to the monotypic genus which was considered previously as a junior synonym of the genus Scaphander. Feeding of E. fragilis on sponges has been noted. A new monotypic genus, Pseudocylichna gen. nov., has been described for Cylichna magna. Morphological differences of the gizzard plates and gizzard walls of the genera mentioned before have been shown. Both genera have been placed in a new family Eoscaphandridae fam. nov. based on their pair gizzard plates and the division of the gizzard wall into four segments by tendons of the connective tissue.

A new pygmy squid, Idiosepius hallami n. sp. (Cephalopoda: Idiosepiidae) from eastern Australia and elevation of the southern endemic ‘notoides’ clade to a new genus, Xipholeptos n. gen.

Zootaxa ◽  
2018 ◽  
Vol 4369 (4) ◽  
pp. 451
Author(s):  
AMANDA L. REID ◽  
JAN M. STRUGNELL
Keyword(s):  
New Genus ◽  
Sequence Divergence ◽  
Molecular Data ◽  
Phylogenetic Position ◽  
12S Rrna ◽  
Data Sets ◽  
Eastern Australia ◽  
The Family ◽  
Morphological Differences ◽  
Australasian Region

A new species of pygmy squid, Idiosepius hallami n. sp., is described from eastern Australia. It differs from I. notoides Berry, 1921 and I. pygmaeus Steenstrup, 1881 (also found in Australian waters) in a number of traits, including the number of club suckers, shape of the funnel-mantle locking apparatus and the modification of the male hectocotylus. Mitochondrial DNA markers (12S rRNA, 16S rRNA and cytochrome c oxidase subunit 1) indicate that it is also distinct on a molecular level. The new Australian species is also recognised as the taxon from Stradbroke I., Queensland for which the entire mitochondrial genome has been sequenced (Hall et al. 2014). Idiosepius hallami n. sp. is compared with all nominal Idiosepius Steenstrup, 1881 and a current summary of Idiosepius systematics is provided as a basis for future studies. Based on our analyses, we propose the elevation of the ‘notoides’ clade to the new genus Xipholeptos n. gen., retaining Idiosepius as the genetic epithet for all other nominal idiosepiids. This is supported by: monophyly of the two lineages based on molecular data sets, the level of sequence divergence between these lineages, and morphological differences. The ‘notoides’ clade is endemic to southern Australia and its basal phylogenetic position suggests that the family may have originated in the Australasian region. Idiosepiids are found in seagrass beds and among mangroves—among the most threatened ecosystems in the world. 

scholarly journals Cell-division pattern and phylogenetic position of a new ciliate genus Parasincirra n. g. (Protista, Ciliophora, Hypotrichia), with report of a new soil species, P. sinica n. sp. found from northwest China

2019 ◽  
Author(s):  
Jiyang Ma ◽  
Yan Zhao ◽  
Tengyue Zhang ◽  
Chen Shao ◽  
Khaled A.S. Al-Rasheid ◽  
...  
Keyword(s):  
New Genus ◽  
Posterior Part ◽  
Northwest China ◽  
Phylogenetic Position ◽  
Ecological Niches ◽  
Biodiversity Survey ◽  
Phylogenetic Studies ◽  
Division Pattern ◽  
Exact Position ◽  
Single Mass

Abstract Background Ciliated species, unicellular eukaryotes, are extremely diverse and occupy a very broad spectrum of ecological niches. Even though there is a growing recognition that enormous ciliates associates with key ecosystem processes in different niches, their diversity is not well understood. One reason is that ciliates are very tiny and may often be overlooked in routine biodiversity survey. Furthermore, the morphological and genetic diversity of ciliates per se is vast and dwarfs that among other multicellular eukaryotes. A new stichotrichid ciliate, Parasincirra sinica n. g., n. sp. is based on classical living morphology, infraciliature, ontogenesis analyses and a comprehensive phylogenetic studies, and enhance understanding of ciliates diversity in sludge soil.Results This new, monotypic genus is defined by having a bipartite adoral zone of membranelles, three frontal cirri, an amphisiellid median cirral row about as long as, or slightly longer than, the adoral zone, one short frontoventral cirral row, cirrus III/2 and transverse cirri present, buccal cirrus and caudal cirri absent, one right and one left marginal row and three dorsal kineties. The morphogenetic features are: (1) five frontoventral-transverse cirral anlagen (excluding undulating membranes anlage) are formed in primary mode; (2) the amphisiellid median cirral row is formed by anlagen V and VI, while the frontoventral row is generated from anlage IV; (3) cirral streaks IV to VI generate one transverse cirrus each; (4) frontoventral-transverse cirral anlage II generates one or two cirri, while the posterior one will be absorbed in late stages, that is, no buccal cirrus is formed; (5) the posterior part of the parental adoral zone of membranelles is renewed; (6) dorsal morphogenesis follows a typical Gonostomum -pattern; and (7) the macronuclear nodules fuse to form a single mass. Based on the SSU rDNA information, analyses of the phylogenetic relationship inferred from Bayesian inference and maximum likelihood analyses were unable to outline the exact position of this new form among some other species of related genera which are generally assigned in the family Amphisiellida. The morphological/ morphogenetical differences between the new genus/species and other amphisiellids, clearly support the validity of the establishment of this new genus Parasincirra .

scholarly journals Ustyurtiidae, a new family of Urodoidea with description of a new genus and two species from Kazakhstan, and discussion on possible affinity of Urodoidea to Schreckensteinioidea (Lepidoptera)

2020 ◽  
Vol 51 (3) ◽  
pp. 444-471 ◽  
Author(s):  
Lauri Kaila ◽  
Kari Nupponen ◽  
Pavel Yu. Gorbunov ◽  
Marko Mutanen ◽  
Maria Heikkilä
Keyword(s):  
Type Species ◽  
New Genus ◽  
Sister Group ◽  
Phylogenetic Position ◽  
Wing Venation ◽  
Morphological Attributes ◽  
New Family ◽  
Group Position ◽  
The Family ◽  
Morphological Differences

Ustyurtiidae Kaila, Heikkilä & Nupponen, a new family of Urodoidea is introduced. The family is based on the genus Ustyurtia Kaila, Heikkilä & Nupponen, gen. n. The genus includes the type species U. zygophyllivora Kaila, Heikkilä & Nupponen, sp. n. and U. charynica Kaila, Heikkilä & Nupponen, sp. n., both from Kazakhstan. These two species, in particular the immature stages, have morphological attributes apomorphic of Urodoidea. The close affinity is also supported by DNA data based on several markers. We consider this new family warranted due to its sister group position to the remaining Urodoidea and a number of significant morphological differences in wing venation, male genitalia and the structure of the cocoon, apomorphic for Ustyurtiidae on the basis of an earlier published phylogeny. All other recognized genera of Urodoidea belong to the family Urodidae. The closest relatives and phylogenetic position of Urodoidea are not firmly established, but Urodoidea and Schreckensteinioidea have morphological similarities which, in the light of genetic analyses appear synapomorphic and possibly uniting these groups, rather than homoplasious as assumed earlier. The affinities of these superfamilies are discussed.

Revealing hidden diversity among tropical cyanobacteria: the new genus Onodrimia (Synechococcales, Cyanobacteria) described using the polyphasic approach

Phytotaxa ◽  
2017 ◽  
Vol 326 (1) ◽  
pp. 28 ◽  
Author(s):  
EVA JAHODÁŘOVÁ ◽  
PETR DVOŘÁK ◽  
PETR HAŠLER ◽  
ALOISIE POULÍČKOVÁ
Keyword(s):  
New Genus ◽  
Sensu Stricto ◽  
Hot Water ◽  
Polyphasic Approach ◽  
Phylogenetic Position ◽  
Rrna Gene ◽  
Peculiar Form ◽  
Morphological Differences ◽  
Trichome Morphology ◽  
The 16S Rrna Gene

Leptolyngbya represents a group of common mat forming cyanobacteria with very simple trichome morphology and a polyphyletic evolutionary origin. In this paper, we used a polyphasic approach to describe a new genus morphologically similar to Leptolyngbya. Three strains of Leptolyngbyaceae cyanobacteria were isolated from submersed bark of tree branches which fell into the Hot-water spring from a rainforest in West Java. A phylogeny of the 16S rRNA gene indicated that these strains fell into a well-supported clade separate from Leptolyngbya sensu stricto. Although our strains possessed only minor morphological differences from other similar Leptolyngbyaceae species, these new taxa may be differentiated based on a peculiar form of reproduction, where hormogonia and hormocytes form tree-like tuft structures. Thus, based on a phylogenetic position, morphological, and ecological evidence, we propose a new genus, Onodrimia.

Refining the genus Rochinia A. Milne-Edwards, 1875: reinstatement of Scyramathia A. Milne-Edwards, 1880 and Anamathia Smith, 1885, and a new genus for Amathia crassa A. Milne-Edwards, 1879, with notes on its ontogeny (Crustacea: Brachyura: Epialtidae)

Zootaxa ◽  
2018 ◽  
Vol 4418 (3) ◽  
pp. 201 ◽  
Author(s):  
MARCOS TAVARES ◽  
WILLIAM SANTANA
Keyword(s):  
Type Species ◽  
New Genus ◽  
Junior Synonym ◽  
Ontogenetic Changes ◽  
Valid Genus ◽  
Morphological Differences

The genus Scyramathia A. Milne-Edwards, 1880 (type species Amathia carpenteri Norman in Wyville Thomson, 1873) is herein removed from the synonymy of Rochinia A. Milne-Edwards, 1875 (type species R. gracilipes A. Milne-Edwards, 1875) and a new genus, Minyorhyncha, is established for Amathia crassa A. Milne-Edwards, 1879, a species previously placed in the genus Rochinia. The genus Anamathia Smith, 1885 (type species Amathia rissoana Roux, 1828), widely regarded as a synonym of Rochinia, is confirmed as a valid genus. The morphological differences between Rochinia (as revealed by its type species), Anamathia, Scyramathia and Minyorhyncha are discussed and illustrated. The strong ontogenetic changes in Minyorhyncha crassa n. gen., n. comb. are also discussed and illustrated. Lectotypes are selected for Rochinia gracilipes A. Milne-Edwards, 1875, and Amathia agassizii Smith, 1882, a junior synonym of Minyorhyncha crassa n. gen., n. comb.

scholarly journals Cell-division pattern and phylogenetic position of a new ciliate genus Parasincirra n. g. (Protista, Ciliophora, Hypotrichia), with report of a new soil species, P. sinica n. sp. found from northwest China

2019 ◽  
Author(s):  
Jiyang Ma ◽  
Yan Zhao ◽  
Tengyue Zhang ◽  
Chen Shao ◽  
Khaled A.S. Al-Rasheid ◽  
...  
Keyword(s):  
New Genus ◽  
Posterior Part ◽  
Northwest China ◽  
Phylogenetic Position ◽  
Phylogenetic Study ◽  
Ecological Niches ◽  
Biodiversity Survey ◽  
The Family ◽  
Division Pattern ◽  
Exact Position

Abstract Ciliated species, unicellular eukaryotes, are extremely diverse and occupy a very broad spectrum of ecological niches. Even though there is a growing recognition that enormous ciliates associates with key ecosystem processes in different niches, their diversity is not well understood. One reason is that ciliates are very tiny and may often be overlooked in routine biodiversity survey. Furthermore, the morphological and genetic diversity of ciliates per se is vast and dwarfs that among other multicellular eukaryotes. Here, we present the study of a new stichotrichid ciliate, Parasincirra sinica n. g., n. sp. based on classical living morphology, infraciliature, ontogenesis analyses and a comprehensive phylogenetic study, and enhance understanding of ciliates diversity in sludge soil. This new, monotypic genus is defined by having a bipartite adoral zone of membranelles, three frontal cirri, an amphisiellid median cirral row about as long as, or slightly longer than, the adoral zone, one short frontoventral cirral row, cirrus III/2 and transverse cirri present, buccal cirrus and caudal cirri absent, three dorsal kineties. The main morphogenetic features are: (1) five frontoventral-transverse cirral anlagen (excluding undulating membranes anlage) are formed in primary mode; (2) the amphisiellid median cirral row is formed by anlagen V and VI, while the frontoventral row is generated from anlage IV; (3) cirral streaks IV to VI generate one transverse cirrus each; (4) frontoventral-transverse cirral anlage II generates one or two cirri, while the posterior one will be absorbed in late stages, that is, no buccal cirrus is formed; (5) the posterior part of the parental adoral zone of membranelles is renewed; (6) dorsal morphogenesis follows a typical Gonostomum -pattern. Based on the SSU rDNA information, analyses of the phylogenetic relationship inferred from Bayesian inference and maximum likelihood analyses were unable to outline the exact position of this new form among some other species of related genera which are generally assigned in the family Amphisiellida . The morphological/ morphogenetical differences between the new genus/species and Uroleptoides / Parabistichella , as well as other amphisiellids, clearly support the validity of the establishment of this new genus Parasincirra .

scholarly journals Cell-division pattern and phylogenetic position of a new ciliate genus Parasincirra n. g. (Protista, Ciliophora, Hypotrichia), with report of a new soil species, P. sinica n. sp. found from northwest China

2020 ◽  
Author(s):  
Chen Shao ◽  
Jiyang Ma ◽  
Yan Zhao ◽  
Tengyue Zhang ◽  
Khaled A.S. Al-Rasheid ◽  
...  
Keyword(s):  
New Genus ◽  
Posterior Part ◽  
Northwest China ◽  
Phylogenetic Position ◽  
Phylogenetic Study ◽  
Ecological Niches ◽  
New Taxon ◽  
Biodiversity Survey ◽  
Exact Position ◽  
Single Mass

Abstract Background: Ciliated species, unicellular eukaryotes, are extremely diverse and occupy a very broad spectrum of ecological niches. Even though there is a growing recognition that enormous ciliates associates with key ecosystem processes in different niches, their diversity is not well understood. One reason is that ciliates are very tiny and may often be overlooked in routine biodiversity survey. Furthermore, the morphological and genetic diversity of ciliates per se is vast and dwarfs that among other multicellular eukaryotes. Here, we present the study of a new stichotrichid ciliate, Parasincirra sinica n. g., n. sp. based on classical living morphology, infraciliature, ontogenesis analyses and a comprehensive phylogenetic study, and enhance understanding of ciliates diversity in sludge soil.Results: This new, monotypic genus is defined by having a bipartite adoral zone of membranelles, three frontal cirri, an amphisiellid median cirral row about as long as, or slightly longer than, the adoral zone, one short frontoventral cirral row, cirrus III/2 and transverse cirri present, buccal cirrus and caudal cirri absent, one right and one left marginal row and three dorsal kineties. The main morphogenetic features of the new taxon are: (1) five frontoventral-transverse cirral anlagen (excluding undulating membranes anlage) are formed in primary mode; (2) the amphisiellid median cirral row is formed by anlagen V and VI, while the frontoventral row is generated from anlage IV; (3) cirral streaks IV to VI generate one transverse cirrus each; (4) frontoventral-transverse cirral anlage II generates one or two cirri, while the posterior one will be absorbed in late stages, that is, no buccal cirrus is formed; (5) the posterior part of the parental adoral zone of membranelles is renewed; (6) dorsal morphogenesis follows a typical Gonostomum-pattern; and (7) the macronuclear nodules fuse to form a single mass. Based on the SSU rDNA information, analyses of the phylogenetic relationship inferred from Bayesian inference and maximum likelihood analyses were unable to outline the exact position of this new form among some other species of related genera which are generally assigned in the family Amphisiellida. The morphological/ morphogenetical differences between the new genus/species and Uroleptoides/ Parabistichella, as well as other amphisiellids, clearly support the validity of the establishment of this new genus Parasincirra.

Cnidochloa: A New Genus of Grasses from Brazil (Poaceae: Panicoideae: Paniceae)

2020 ◽  
Vol 105 (2) ◽  
pp. 183-194
Author(s):  
Fernando O. Zuloaga ◽  
Sandra S. Aliscioni ◽  
M. Amalia Scataglini
Keyword(s):  
New Genus ◽  
Phylogenetic Position ◽  
South American ◽  
The South ◽  
South American Species ◽  
Molecular Characters

Generic boundaries of the South American species Panicum longipedicellatum Swallen are explored and compared with allied genera of the tribe Paniceae. On the basis of morphological, anatomical, and molecular characters a new genus, Cnidochloa Zuloaga, is proposed. The phylogenetic position of the new genus within the Paniceae is evaluated.

Pseudoditrichum mirabile gen. et sp. nov. (Musci: Pseudoditrichaceae fam. nov.), a unique moss from Great Bear Lake, Northwest Territories

1974 ◽  
Vol 52 (4) ◽  
pp. 701-705 ◽  
Author(s):  
William Campbell Steere ◽  
Zennoske Iwatsuki
Keyword(s):  
Northwest Territories ◽  
New Genus ◽  
The Arctic ◽  
Phylogenetic Position ◽  
New Genus And Species ◽  
Arctic Circle ◽  
New Family ◽  
Bear Lake ◽  
Evolutionary Level

The name Pseudoditrichum mirabile Steere et Iwatsuki is proposed for a minute moss with leafy stem 1-3 mm high and seta 6 mm long; it was collected on calcareous silt near the Sloan River, Great Bear Lake, Northwest Territories, only a few miles south of the Arctic Circle. The gametophytic characters agree well with those of the Ditrichaceae, a relatively primitive family, but the peristome is clearly double, with the inner and outer teeth opposite, which thereby indicates a much more advanced phylogenetic position, perhaps at the evolutionary level of the Funariaceae. As the combination of gametophytic and sporophytic characteristics exhibited by this moss does not occur in any existing family of mosses, it is therefore deemed necessary to create the new family Pseudoditrichaceae for the new genus and species described here.

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