Taxonomy, paleoecology and biostratigraphy of the late Neoproterozoic Chichkan microbiota of South Kazakhstan: the marine biosphere on the eve of metazoan radiation

2010 ◽  
Vol 84 (3) ◽  
pp. 363-401 ◽  
Author(s):  
Vladimir N. Sergeev ◽  
J. William Schopf
Keyword(s):  
New Species ◽  
Green Alga ◽  
Testate Amoebae ◽  
Evolutionary Stage ◽  
Two New Species ◽  
The Status ◽  
Late Neoproterozoic ◽  
Eukaryotic Microfossils ◽  
Marine Biosphere ◽  
Open Shelf

Carbonaceous bedded cherts of the late Neoproterozoic (Cryogenian) ∼800 to 750 Ma old Chichkan Formation of South Kazakhstan contain an abundant, diverse assemblage of exquisitely preserved microorganisms. Like many Proterozoic microbiotas, the Chichkan assemblage is dominated by prokaryotic cyanobacteria, both filamentous (oscillatorialeans and nostocaleans, represented primarily by cellular trichomes and empty sheaths) and coccoidal (chroococcaleans and pleurocapsaleans, including solitary, colonial, and stalk-forming specimens). However, unlike Proterozoic microbiotas reported from peritidal settings, the Chichkan fossils, permineralized in cherts deposited in the open shelf facies of the formation, include diverse microscopic eukaryotes: vase-shaped testate amoebae, spiny (acanthomorphic) phytoplanktonic unicells, large (up to ∼1 mm diameter) megasphaeromorphic acritarchs, and sausage-shaped vaucheriacean green alga-like filaments.Given the composition of this biota and the presence in it and similarly aged assemblages of numerous taxa typical of late Neoproterozoic deposits (e.g., Cerebrosphaera, Jacutianema, Melanocyrillium, Stictosphaeridium, Trachyhystrichosphaera, and Vandalosphaeridium), the Chichkan Lagerstätte appears representative of the Cryogenian biota as now known, thereby documenting the status of the marine biosphere at a time closely preceding the radiation of the Metazoa. As such, we interpret this and other coeval mixed assemblages of prokaryotic and eukaryotic microfossils as representing an evolutionary stage transitional between the predominantly prokaryote-dominated Precambrian and the eukaryote-dominated Phanerozoic biospheres.As reported here, the Chichkan assemblage is composed of 39 taxa (of which two forms are described informally) that are assigned to 23 genera of microscopic prokaryotes and eukaryotes and that include two new species: Polybessurus crassus n. sp. and Vandalosphaeridium koksuicum n. sp.

The tribe Aschistodesmini in the Solomon Islands (Diplopoda, Polydesmida: Paradoxosomatidae)

1999 ◽  
Vol 30 (4) ◽  
pp. 459-479
Author(s):  
C.A.W. Jeekel
Keyword(s):  
New Species ◽  
Related Species ◽  
Solomon Island ◽  
Solomon Islands ◽  
Closely Related Species ◽  
Two New Species ◽  
The Status

AbstractThe Aschistodesmini from the Solomon Island are reviewed. Besides clarifying notes on the status of the type and closely related species of Aschistodesmus, descriptive notes and illustrations of the gonopods of the Solomon species of this genus, particularly of those published by Chamberlin, 1920, under the generic name of Solomonosoma, are given. Two new species, A. spatulifer and A. tridentifer are described, and a key to the species is provided. From Rennell Island Dorcadogonus modestus gen. n., sp. n. is described.

scholarly journals Protocirrineris (Polychaeta:Cirratulidae) in South Africa and description of two new species

2019 ◽  
Vol 67 (S5) ◽  
pp. S70-S80
Author(s):  
Rodolfo Elías ◽  
María Andrea Saracho-Bottero ◽  
Carol Anne Simon
Keyword(s):  
Electron Microscope ◽  
New Species ◽  
Scanning Electron Microscope ◽  
Southern Africa ◽  
New Techniques ◽  
Tropical Regions ◽  
Diagnostic Characters ◽  
Two New Species ◽  
The Status ◽  
Scanning Electron

Introduction: The knowledge of polychaetes in the subtropical region of Africa benefited from the activity of J. Day. However, 50 years after the publication of his Monograph of the Polychaeta of southern Africa, it is necessary to reconsider the identity of the Cirratulidae due to changes in the diagnostic characters and new approaches to the taxonomy of the group to corroborate the status of cosmopolitan species in this region. Objective: We hypothesize that biodiversity of multitentacular Cirratulidae polychaetes has been significantly underestimated in southern Africa. Methods: The present work analyzes material deposited in the Iziko museum, as well as recently collected specimens, using scanning electron microscope to identify them. Results: The material corresponds to two new species belonging to the genus Protocirrineris. Protocirrineris strandloperarum sp. nov. is characterized by having the tentacular filaments between the chaetigers 5 to 10-12 and the first pair of branchiae from chaetiger 7, and P. magalhaesi sp. nov. is characterized by having tentacular filaments between chaetigers 4-8 and the first pair of branchiae from chaetigers 2 or 3. Descriptions of these species, with light and scanning electron microscope images, are given. Schematic drawings of the two new species are shown comparatively with diagnostic characters. Conclusions: The use of new techniques enables discovery of new taxonomic characters and two new species of the genus. The diversity of Cirratulidae polychaetes is underestimated also in the subtropical and tropical regions of Africa.

A revision of the genus Donda Moore, 1882 with description of two species from East Asia (Lepidoptera, Noctuidae: Pantheinae). Revision of Pantheinae, contribution V

Zootaxa ◽  
2012 ◽  
Vol 3582 (1) ◽  
pp. 37 ◽  
Author(s):  
G. BEHOUNEK ◽  
H. L. HAN ◽  
V. S. KONONENKO
Keyword(s):  
New Species ◽  
East Asia ◽  
Type Species ◽  
Female Genitalia ◽  
Male And Female ◽  
Two New Species ◽  
The Status ◽  
Lepidoptera Noctuidae

The Oriental Pantheinae genus Donda Moore, 1882 is revised. The type-species of the genus—Donda eurychlora (Walker, 1858) is recognized as a complex of species. Two new species, Donda continentalis sp. n. from Thailand, China, and Vietnam and D. sundana sp. n. from Indonesia are described. Two species, D. thoracica Moore, 1882 and D. striatovirens Moore, 1883, are excluded from the genus Donda. The status of two taxa, D. ornata Moore, 1883 and D. lichenoides (Hampson, 1894) remains open. The imagines, male and female genitalia are illustrated. The checklist of the genus Donda is presented.

New seriated Amathia species in Japan, with a redescription of A. acervata Lamouroux, 1824 (Bryozoa: Ctenostomata)

Zootaxa ◽  
2020 ◽  
Vol 4742 (2) ◽  
pp. 311-331
Author(s):  
M. HIROSE ◽  
D.P. GORDON ◽  
J.-L. D’HONDT
Keyword(s):  
New Species ◽  
Type Specimen ◽  
Colony Form ◽  
Japanese Coast ◽  
Specimen Material ◽  
Two New Species ◽  
Dark Colour ◽  
The Status ◽  
Stolon Length ◽  
A New Species

The status of seriated Amathia species (Bryozoa: Ctenostomata) in Japan is reviewed. Several historical specimens and materials recently collected from several localities along the Japanese coast are examined in this study. Amathia acervata Lamouroux, 1824, collected from Japan by Wilhelm Gottlieb Tilesius in 1804, was examined and is redescribed from a reconstituted fragment of the sole type specimen. Material previously reported from Wakayama Prefecture is very similar to Amathia acervata, but differs in having fewer autozooid pairs per cluster, which spiral in different directions; the species is described as a new species Amathia brevisilva n. sp. Measurements of colony characters vary according to the effects of fixation, but stolon length, the ratio of autozooid clusters on stolons, spirality and pigmentation are useful characters for the identification of Japanese seriated Amathia. In addition, two new species are described, Amathia reptopinnata n. sp. and Amathia fimbria n. sp. Amathia reptopinnata n. sp. is characterized by its robust form, dark colour, dichotomous branching, long stolons, long autozooidal clusters and pinnately arranged prostrate zooids. Amathia fimbria n. sp. was found only in the Showa Emperor collection, and is characterized by its compact colony form, remarkably short internode length and trichotomous branching. 

scholarly journals THE ALPHEID SHRIMP OF INDONESIA, BASED UPON J.G. DE MAN'S "THE DECAPODA OF THE SIBOGA EXPEDITION, PART II. FAMILY ALPHEIDAE." (1911)

2018 ◽  
Vol 25 ◽  
pp. 1-79 ◽  
Author(s):  
Dora M. Banner ◽  
Albert H. Banner
Keyword(s):  
New Species ◽  
New Records ◽  
Additional Species ◽  
Nomen Dubium ◽  
Two New Species ◽  
The Status ◽  
De Man ◽  
Established Species ◽  
Alpheid Shrimp

We wish not only to up-date the taxonomy used by DE MAN in his 1911 study but also to add to his list of species those new records of species from Indonesia based, upon collections made subsequently by various individuals and agencies. DE MAN reported that he had 113 species and 20 varieties of these shrimp from the Siboga Expedition; of these, 54 species and varieties have been reduced to synonymy in the subsequent years. In the present study these additional species are also being so reduced:Alpheopsis hummelinki SCHMITT (= Neoalpheopsis euryone (De Man)Neoalpheopsis hiatti BANNER (= N. euryone De Man) Synalpheus jedanensis De Man (= S. iphinoe De Man) S. miscellaneus De Man ( = S. neomeris (De Man) S. physocheles Coutiere (= S. triunguiculatus (Paulson) S. sluiteri De Man (= S. paraneomeris Coutiere) S. stimpsonii var. maldivensis C outiere (= S. stimpsonii ( De Man) S. streptodactytoides De Man (=S. streptodactylus Couti>re)From the post-Siboga collections, we list an additional 28 established species from Indonesian waters as well as two new species: Alpheus nipa and Synalpheus mortenseni; we also have reviewed the status of Alpheus (= Synalpheus) tricuspidatus Heller (1861) and consider it to be a nomen dubium. We now recognize a total of 145 species from Indonesian waters plus an additional 2 species left unnamed by De Man and by us.

Integrative taxonomy and phylogeography of Colomys and Nilopegamys (Rodentia: Murinae), semi-aquatic mice of Africa, with descriptions of two new species

2020 ◽  
Author(s):  
Thomas C Giarla ◽  
Terrence C Demos ◽  
Ara Monadjem ◽  
Rainer Hutterer ◽  
Desiré Dalton ◽  
...  
Keyword(s):  
New Species ◽  
Democratic Republic ◽  
Distinct Species ◽  
Integrative Taxonomy ◽  
North West ◽  
Equatorial Africa ◽  
Two New Species ◽  
The Status ◽  
Republic Of The Congo ◽  
Multilocus Phylogeny

Abstract The semi-aquatic African murine genera Colomys and Nilopegamys are considered monotypic and thought to be closely related to one another. Colomys occurs across forested regions of equatorial Africa, whereas Nilopegamys is known only from the Ethiopian holotype, making it among the rarest mammalian genera in the world – and possibly extinct. Using morphological and genetic data, we reassess the taxonomy of Colomys and Nilopegamys. A multilocus phylogeny with outgroups demonstrates that Nilopegamys is sister to Colomys. In addition, we recognize at least four morphologically diagnosable and genetically distinct species within Colomys: C. eisentrauti (elevated from subspecies and restricted to north-west Cameroon), C. goslingi (with a more restricted range than previously reported) and two new species (one from Liberia and Guinea and one from central and southern Democratic Republic of the Congo and Angola). We also review the status of four other taxa currently recognized within Colomys goslingi (bicolor, denti, goslingi and ruandensis) and demonstrate that these names lack phylogenetic and/or morphological support. Finally, we discuss potential biogeographic barriers that may have played a role in the evolution of Colomys and Nilopegamys, emphasizing the importance of rivers in both facilitating and, possibly, limiting dispersal within these genera.

The genus Caligus Müller, 1785 (Copepoda: Siphonostomatoida): two new species from reef associated fishes in New Caledonia, and some nomenclatural problems resolved

Zootaxa ◽  
2012 ◽  
Vol 3534 (1) ◽  
pp. 21 ◽  
Author(s):  
POLLY HAYES ◽  
JEAN-LOU JUSTINE ◽  
GEOFFREY A. BOXSHALL
Keyword(s):  
New Species ◽  
Dorsal View ◽  
New Caledonia ◽  
Distal Segment ◽  
Valid Species ◽  
Genital Complex ◽  
Two New Species ◽  
The Status ◽  
Subjective Synonym

Caligus praecinctorius sp. nov. is described on the basis of females taken from the gills of Gymnocranius grandoculisValenciennes, 1830, G. euanus (Günther, 1879) and Epinephelus fasciatus (Forsskål, 1775), all caught in New Caledonia.The new species is characterised by having the posteromedian lobe of the cephalothorax completely covering the fourthpedigerous somite in dorsal view, and by the genital complex being 2.7 times wider than long. A second new species, C.macoloricola sp. nov., is described based on material from the gills of Macolor niger (Forsskål, 1775). It is distinguishedby the combination of a 3-segmented leg 4 with 4 spines on the distal segment, a vestigial post-antennal process, and theconfiguration of the setal elements on the exopod of leg 1. The status of a number of other Caligus species is reviewed. Itis proposed to treat C. angustatus Krøyer, 1863 as a junior subjective synonym of C. gurnardi Krøyer, 1863, C. dactylusHo, Lin & Chang, 2007 as a junior subjective synonym of C. dactylopteni Uma Devi & Shyamasundari, 1981, and C.kirtioides Ho & Lin, 2004 as a junior subjective synonym of C. jawahari Hameed & Adamkutty, 1985. Caligus bifurcatusPearse, 1952 is recognised as a junior subjective synonym of Tuxophorus caligodes Wilson, 1908. Caligus cristatusGould, 1841 is here treated as a species inquirendum in the pandarid genus Dinemoura Latreille, 1829. Caligus elevatusKirtisinghe, 1964 is discovered to be an incorrect subsequent spelling of C. clavatus Kirtisinghe, 1964. Caligus gayiNicolet, 1849 is here treated as a species inquirendum. It is proposed to treat C. oligoplitisi Carvalho, 1956, C. validusPearse, 1952 and C. mercatoris Capart, 1941 as junior subjective synonyms of C. robustus Bassett-Smith, 1898 and a listof known hosts of this species is presented. Caligus pterois Kurian, 1949 has priority over Caligus russellii Kurien, 1950,which is here treated as a junior objective synonym, since the two descriptions were based on the same material. We rejectCressey’s (1991) proposal to treat C. tenax Heller, 1865 as a synonym of C. chorinemi Krøyer, 1863 and we retain C. tenaxas a valid species. We propose to treat C. spinosurculus Pearse, 1951 as a junior subjective synonym of C. tenax. Wepropose to treat C. multispinosus Shen, 1957 as a junior subjective synonym of C. stromatei Krøyer, 1863. We note thatCaligus trichiuri Krøyer, 1863 is the oldest available name for the taxon Metacaligus uruguayensis Thomsen, 1949. SoCaligus (Metacaligus) uruguayensis Thomsen, 1949 becomes a junior subjective synonym and the valid name for this taxon is Metacaligus trichiuri (Krøyer, 1863).

scholarly journals A multigene and morphological analysis expands the diversity of the seabod shrimp Xiphopenaeus Smith, 1869 (Decapoda: Penaeidae), with descriptions of two new species

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Abner Carvalho-Batista ◽  
Mariana Terossi ◽  
Fernando J. Zara ◽  
Fernando L. Mantelatto ◽  
Rogerio C. Costa
Keyword(s):  
New Species ◽  
Morphological Analysis ◽  
Taxonomic Status ◽  
Morphological Characters ◽  
Integrative Approach ◽  
Genetic Groups ◽  
The Pacific ◽  
Two New Species ◽  
The Status ◽  
History Of

Abstract After being stable for nearly a century, the taxonomic history of the genus Xiphopenaeus has been marked by many changes in the last three decades. The taxonomic status of the Atlantic species has a low resolution, and many species are still undefined and grouped as cryptic species. Here we employed an integrative approach to define the species of Xiphopenaeus and the morphological characters needed to differentiate them. We combined the analyses of two molecular markers (COI and 16 S rDNA), scanning electron microscopy and light microscopy. Based on specimens from 17 localities from the Atlantic and Pacific oceans, we detected five divergent genetic groups, three in the Atlantic (A1, A2, A3) and two in the Pacific (P1, P2). Male secondary sexual characters were able to differentiate four out of the five genetic groups. Group A1 corresponds to X. kroyeri, and A2 and A3 correspond to new species. We redescribed the genus and two new species are described and illustrated: Xiphopenaeus dincao nov. sp. (A2) and Xiphopenaeus baueri nov. sp. (A3). Since the holotype of X. riveti was missing and the specimen analysed from group P2 was a female, the status of the species of Xiphopenaeus from the Pacific remains unresolved.

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