The smooth, spire-bearing brachiopods after the terminal Ordovician extinction through lower Llandovery in the central Oslo region, Norway

2021 ◽  
pp. 1-31
Author(s):  
B. Gudveig Baarli
Keyword(s):  
New Species ◽  
Sea Level ◽  
Water Depth ◽  
New Genus ◽  
Lower Silurian ◽  
Close Affinity ◽  
Gradual Evolution ◽  
Environmental Setting ◽  
The Family ◽  
Group A

Abstract Strata of the Solvik Formation in the central Oslo region (upper Hirnantian to upper Aeronian) are rich in atrypides that elucidate the evolution of this group. A few athyridide brachiopods are also present. Eleven taxa of smooth spire-bearers are described taxonomically using fossils and peels. Among these occur one new genus, Eisaella, and five new species: Eisaella uniplicata, Thulatrypa huangi, T. vikenensis, ?Becscia pentagona, and Shelvothyris bivittata. Atrypides make up 30% (24 genera) of the total brachiopod genera in the Solvik Formation, more than one third of the known global atrypide fauna during that interval. Most are members of the family Lissatrypidae, illustrating the evolution of this group from upper Hirnantian and lower Silurian strata. These show close affinity to each other attesting to ongoing radiation. The new genus Eisaella is a likely ancestor of Lissatrypa, while Meifodia displays a gradual evolution through the formation. Atrypides were most diverse at the base and top of the Solvik Formation due to heterogony in environments and water depth, but were less diverse in the comparatively constant environmental setting of the late Rhuddanian time. The basal assemblages with few atrypides from shallow facies may be compared to the shallow Cathay Fauna of China. Most of the abundant Norwegian atrypide fauna is found in deeper water with few comparable faunas known globally. The Oslo region may have served as a center for the evolution and spread of atrypides immediately following the end-Ordovician glacial drawdown in sea level. UUID: http://zoobank.org/508dba95-5501-403d-9a4d-deeb324847c9

Silurian Ramphoprionid polychaetes from Gotland, Sweden

2001 ◽  
Vol 75 (5) ◽  
pp. 993-1015 ◽  
Author(s):  
Mats Eriksson
Keyword(s):  
New Species ◽  
New Genus ◽  
Morphological Changes ◽  
Original Description ◽  
Surface Structures ◽  
New Genus And Species ◽  
Gradual Evolution ◽  
The Family ◽  
Stratigraphic Ranges ◽  
Stratigraphic Range

Silurian ramphoprionid polychaete annelids, represented by their jaws (scolecodonts), are described from extensive collections from Gotland, Sweden. The family Ramphoprionidae, monotypic at its original description, is sub-divided into four genera; Protarabellites Stauffer, 1933; Ramphoprion Kielan-Jaworowska, 1962; “Pararamphoprion” Männil and Zaslavskaya, 1985; and Megaramphoprion new genus. Identified species include “P.” cf. nordicus Männil and Zaslavskaya, 1985; P. rectangularis new species; P. staufferi new species; P. triangularis new species; and two Protarabellites species left in open nomenclature. Ramphoprion is represented by one new highly plastic species, R. gotlandensis, housing five distinguishable morphotypes showing gradual evolution. Megaramphoprion, which is most closely related to Ramphoprion, is represented by M. magnus new genus and species, a rare but distinctive taxon. Most species have long stratigraphic ranges within which important morphological changes can nonetheless be observed. The stratigraphic range of ramphoprionids includes, at least, the Ordovician to the Silurian. They are fairly rare in the Silurian of Gotland and where present they generally form less than 10 percent of the polychaete faunas, although occasionally reaching as much as 20 to 30 percent. Evolution, paleoecology, and surface structures of the investigated species are briefly discussed.

Insolitignum n.gen. and Palaeoephippium Goodbody 1986 (Radiolaria) from the Lower Silurian of the Cape Phillips Formation, Arctic Canada

1999 ◽  
Vol 36 (12) ◽  
pp. 2051-2057 ◽  
Author(s):  
Eugene W MacDonald
Keyword(s):  
New Species ◽  
Type Species ◽  
New Genus ◽  
Intermediate Position ◽  
Arctic Canada ◽  
Lower Silurian ◽  
The Family ◽  
Cape Phillips Formation ◽  
Cornwallis Island

Radiolaria of the family Palaeoscenidiidae were recovered from two bedded-limestone and two limestone-concretion samples from the upper Llandovery of the Cape Phillips Formation, Cornwallis Island, Arctic Canada. The new genus Insolitignum is defined by two apical rays, three basal rays, and a principal ray in an intermediate position. The principal ray distinguishes this genus from Palaeoephippium. Insolitignum dissimile, the type species of the new genus, was previously placed in Palaeoephippium. New species described here are Insolitignum peranima, Insolitignum vivanima, and Palaeoephippium adraini.

scholarly journals A new genus and two new species of cavernicolous amphipods (Crustacea: Typhlogammaridae) from the Western Caucasus

2015 ◽  
Author(s):  
Dmitry A. Sidorov ◽  
Andrey A. Gontcharov ◽  
Svetlana N. Sharina
Keyword(s):  
New Species ◽  
New Genus ◽  
Identification Key ◽  
Amphipod Species ◽  
Distribution Map ◽  
Western Caucasus ◽  
Close Affinity ◽  
The Family ◽  
Two New Species ◽  
The Western Caucasus

This study deals with the biodiversity and distribution of cavernicolous Amphipoda in caves of the Arabika massif (Western Caucasus). The Sarma, Trojka and Orlinoe Gnezdo caves were explored during speleological expeditions over the years 2011–12. Two new species of Amphipoda were found: a sub-surface dweller Zenkevitchia sandroruffoi sp. nov. is reported from the Sarma, Trojka and Orlinoe Gnezdo caves at depths from -30 m to -350 m; the second one, a deep dweller Adaugammarus pilosus gen. et sp. nov. is reported from the Sarma Cave at depths of -1270 to -1700 m. Adaugammarus gen. nov. shares similarities with Typhlogammarus Schäferna, 1907 and Zenkevitchia Birstein, 1940. The species Anopogammarus birsteini Derzhavin, 1945 is also re-described herein based on new samples that suggest close affinity of this species with the family Gammaridae. The original taxonomic combination is resurrected for Zenkevitchia revazi Birstein & Ljovuschkin, 1970, comb. resurr. (from Anopogammarus Derzhavin, 1945). To accommodate morphologically different species in the genus Zenkevitchia, two new groups are proposed. These are the admirabilis-group (Z. admirabilis Birstein, 1940 and Z. yakovi Sidorov, 2015) and the sandroruffoi-group (Z. sandroruffoi sp. nov. and Z. revazi). An updated molecular (mt-cox1) phylogeny, an identification key to the genera and a distribution map for the typhlogammarid amphipod species of Transcaucasia are provided.

Cryptofavognathus, a new genus of the family Cryptognathidae Oudemans (Acari: Raphignathoidea), with the description of a new species from Turkey

Zootaxa ◽  
2010 ◽  
Vol 2533 (1) ◽  
pp. 36 ◽  
Author(s):  
SALİH DOĞAN ◽  
GÜLDEM DÖNEL
Keyword(s):  
New Species ◽  
Adult Female ◽  
New Genus ◽  
The Family ◽  
A New Species

A new genus, Cryptofavognathus is proposed for two species, Cryptofavognathus afyonensis (Koç & Akyol, 2004) comb. nov. and C. anatolicus sp. nov. The adult female and male of C. anatolicus sp. nov. collected from moss and a bird’s nest are herein described and figured.

Cassiavellia galtarae, new species, new genus: a new Permian bivalve and its significance for pterioidean systematics

2010 ◽  
Vol 84 (6) ◽  
pp. 1152-1176 ◽  
Author(s):  
Ilya Tëmkin ◽  
John Pojeta
Keyword(s):  
New Species ◽  
New Genus ◽  
Larval Shell ◽  
Upper Permian ◽  
Taxonomic Significance ◽  
New Genus And Species ◽  
The Family ◽  
Dental Ontogeny

An exceptionally well-preserved silicified bivalve from the Upper Permian of Texas is described and assigned to a new genus and species,Cassiavellia galtarae, placed in the family Bakevelliidae. The species represents one of the earliest and best characterized unequivocal occurrences of the multivincular ligament in the superfamily Pterioidea. The silicified material provides a wealth of information on the morphology of inadequately known Paleozoic pterioideans, including hitherto undescribed aspects of the larval shell, auricular sulcus, muscle scars, and dental ontogeny. The discovery of the condyle-fossa complex on the anteroventral shell margin, a feature previously undescibed in Bivalvia, raises the question of the homology and taxonomic significance of the problematic subumbonal ridge-like structures in Pterioidea. In life,C. galtaraewas probably an epifaunal right-pleurothetic bivalve, byssally attached to hard or raised flexible substrata. In addition toC. galtarae, another new species,C. nadkevnae, is placed inCassiavellia.

New genus and four new species of the family Cunaxidae (Acariformes: Prostigmata: Bdelloidea) from Zambia

2021 ◽  
Author(s):  
Izabella Laniecka ◽  
Ronald Laniecki ◽  
Andrzej Kazmierski
Keyword(s):  
New Species ◽  
New Genus ◽  
The Family

New genus and four new species of the family Cunaxidae: Quasiscutopalus impala gen. nov., sp. nov., Armascirus livingstoni sp. nov., Cunaxa mukuni sp. nov. and Cunaxa niedbalai sp. nov. are described and figured from Zambia. Additionally, Cunaxa gazella (Berlese, 1916) is recorded and discussed.

Two Ordovician asterozoans (Echinodermata) of problematic affinities

2014 ◽  
Vol 88 (6) ◽  
pp. 1163-1173 ◽  
Author(s):  
Daniel B. Blake
Keyword(s):  
New Species ◽  
New Genus ◽  
Early Period ◽  
Early Ordovician ◽  
Class Level ◽  
The Family ◽  
Evolutionary Radiation ◽  
Frame Construction

Phragmactis grayaeSpencer andSwataria derstlerinew genus new species are early (Ordovician) asterozoans (Echinodermata) that comprise the Phragmactinidae. Asterozoans are complexly varied, but as is true for other echinoderms, ambulacral construction is critical to interpretation. Phragmactinids share plesiomorphic aspects of ambulacral form and articulation with basal somasteroids and stenuroids whereas the apomorphic ambulacral expressions of asteroids and ophiuroids are lacking. Phragmactinids, like asteroids and ophiuroids, have only one virgal-series ossicle associated with each ambulacral, unlike the multiple ossicles of somasteroids and stenuroids. Virgal morphology of phragmactinids is reminiscent of expressions in somasteroids and stenuroids. Aspects of phragmactinid mouth frame construction are apomorphic. Morphologies of other ossicular series are similarly varied, and as a result, the family cannot be easily fitted into a recently proposed class-level taxonomy of early asterozoans; it is left in open nomenclature. Phragmactinid morphology does not indicate behavior significantly different from that of other early asterozaons. Asterozoan diversity suggests an early period of rapid evolutionary radiation.

Mimaporia, a new genus of Epicopeiidae (Lepidoptera), with description of a new species from Vietnam

Zootaxa ◽  
2017 ◽  
Vol 4254 (5) ◽  
pp. 537 ◽  
Author(s):  
CHIA-HSUAN WEI ◽  
SHEN-HORN YEN
Keyword(s):  
New Species ◽  
New Genus ◽  
Sequence Data ◽  
Phylogenetic Analyses ◽  
Taxonomic Status ◽  
Sister Group ◽  
Morphological Evidence ◽  
New Taxon ◽  
The Family ◽  
A New Species

The Epicopeiidae is a small geometroid family distributed in the East Palaearctic and Oriental regions. It exhibits high morphological diversity in body size and wing shape, while their wing patterns involve in various complex mimicry rings. In the present study, we attempted to describe a new genus, and a new species from Vietnam, with comments on two assumed congeneric novel species from China and India. To address its phylogenetic affinity, we reconstructed the phylogeny of the family by using sequence data of COI, EF-1α, and 28S gene regions obtained from seven genera of Epicopeiidae with Pseudobiston pinratanai as the outgroup. We also compared the morphology of the new taxon to other epicopeiid genera to affirm its taxonomic status. The results suggest that the undescribed taxon deserve a new genus, namely Mimaporia gen. n. The species from Vietnam, Mimaporia hmong sp. n., is described as new to science. Under different tree building strategies, the new genus is the sister group of either Chatamla Moore, 1881 or Parabraxas Leech, 1897. The morphological evidence, which was not included in phylogenetic analyses, however, suggests its potential affinity with Burmeia Minet, 2003. This study also provides the first, although preliminary, molecular phylogeny of the family on which the revised systematics and interpretation of character evolution can be based. 

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