Anatomy and morphology of Cremnothamnus (Asteraceae) a new genus for Helichrysum thomsonii

1994 ◽  
Vol 7 (6) ◽  
pp. 569 ◽  
Author(s):  
CF Puttock
Keyword(s):  
New Genus ◽  
Sister Taxon ◽  
General Morphology ◽  
Cladistic Analyses

The stem and cypsela anatomy, and the general morphology of Helichrysum thomsonii F.Muel1. (Ozothamnus thomsonii (F.Muell.) Paul G. Wilson) are investigated. Cladistic analyses indicate that Helichrysum thomsonii is not closely related to the four genera to which it has been previously associated (Basedowia, Helichrysum, Lawrencella and Ozothamnus), but is a likely sister taxon of Argyroglottis, Bracteantha and the rest of the Angianthinae. A new genus, Cremnothamnus Puttock, is proposed for Helichrysum thomsonii.

The phylogenetic position of the tuatara, Sphenodon (Sphenodontida, Amniota), as indicated by cladistic analysis of the ultrastructure of spermatozoa

1992 ◽  
Vol 335 (1274) ◽  
pp. 207-219 ◽  
Keyword(s):  
Cladistic Analysis ◽  
Sister Group ◽  
Sister Taxon ◽  
Phylogenetic Position ◽  
Sister Group Relationship ◽  
Usual Concept ◽  
Cladistic Analyses ◽  
Relationship Of

Sphenodon has traditionally been regarded as a little changed survivor of the Permo-Triassic thecodont or eosuchian ‘stem reptiles’ but has alternatively been placed in the Lepidosauria as the plesiomorphic or even apomorphic sister-taxon of the squamates. A cladistic analysis of 16 characters from spermatozoal ultrastructure of Sphenodon and other amniotes unequivocally confirms its exceedingly primitive status. The analysis suggests that monotremes are the sister-group of birds; squamates form the sister-group of a bird + monotreme clade while the three sister-groups successively below the bird + monotreme + squa- mate assemblage are the caiman, the tuatara and the outgroup (turtles). The monotreme + bird couplet, supports the concept of the Haemothermia, but can only be regarded heuristically. The usual concept of mammals as a synapsid-derived outgroup of all other extant amniotes is not substantiated spermatologically. All cladistic analyses made, and a separate consideration of apomorphies, indicate that Sphenodon is spermatologically the most primitive amniote, excepting the Chelonia. It is advanced (apomorphic) for the amniotes in only two of the 16 spermatozoal characters considered. A close, sister-group relationship of Sphenodon with squamates is not endorsed.

Reappraisal of arctostylopid mammal Kazachostylops occidentalis from the late Paleocene of Kazakhstan and phylogenetic relationships within Arctostylopida

2019 ◽  
Vol 94 (3) ◽  
pp. 568-579
Author(s):  
Alexander O. Averianov
Keyword(s):  
Phylogenetic Analysis ◽  
North American ◽  
Phylogenetic Relationships ◽  
New Genus ◽  
Principal Component ◽  
Sister Taxon ◽  
Phylogenetic Hypothesis ◽  
Lower Eocene ◽  
Principal Component Analyses ◽  
Upper Paleocene

AbstractKazachostylops occidentalis Nesov, 1987b, based on partial maxilla and dentary from the upper Paleocene Zhylga locality in South Kazakhstan, is redescribed. A new phylogenetic hypothesis of Arctostylopida is proposed based on phylogenetic analysis of 26 characters and 17 taxa. Kazachostylops is recovered as a sister taxon to the Arctostylopinae, the advanced clade of Asian and North American arctostylopids characterized by pseudohypocone on upper molars and reduced trigonid of lower molars, with the ectolophid being attached labial on the trigonid. Kazachostylops differs from more basal arctostylopids (Asiostylops, Allostylops, Bothriostylops, and Wanostylops) by higher-crowned molars, M1–3 metaconule absent, m1–3 entoconid connected with ectolophid by entolophid, and m2 wider than m1 and m3. Principal component analyses of the upper and lower dentition of arctostylopids show great distinctness of Kazachostylops from other members of the group. The arctostylopid taxa are reviewed, and the new genus Enantiostylops is erected for ‘Sinostylops’ progressus Tang and Yan, 1976 from the lower Eocene of China, because of uniquely concave parastylar area on upper molars.UUID: http://zoobank.org/a46d8f29-fd73-4e59-88dc-fcc55b12d1d3

scholarly journals Ferrodraco lentoni gen. et sp. nov., a new ornithocheirid pterosaur from the Winton Formation (Cenomanian–lower Turonian) of Queensland, Australia

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Adele H. Pentland ◽  
Stephen F. Poropat ◽  
Travis R. Tischler ◽  
Trish Sloan ◽  
Robert A. Elliott ◽  
...  
Keyword(s):  
Phylogenetic Analysis ◽  
New Genus ◽  
Sister Taxon ◽  
New Genus And Species ◽  
The Third ◽  
Mandibular Tooth

Abstract The Australian pterosaur record is poor by world standards, comprising fewer than 20 fragmentary specimens. Herein, we describe the new genus and species Ferrodraco lentoni gen. et sp. nov., based on the most complete pterosaur specimen ever found in Australia, and the first reported from the Winton Formation (Cenomanian–lower Turonian). The presence of premaxillary and mandibular crests, and spike-shaped teeth with subcircular bases, enable Ferrodraco to be referred to Anhangueria. Ferrodraco can be distinguished from all other anhanguerian pterosaurs based on two dental characters: the first premaxillary and mandibular tooth pairs are small; and the fourth–seventh tooth pairs are smaller than the third and eighth ones. Ferrodraco was included in a phylogenetic analysis of Pterosauria and resolved as the sister taxon to Mythunga camara (upper Albian Toolebuc Formation, Australia), with that clade occupying the most derived position within Ornithocheiridae. Ornithocheirus simus (Albian Cambridge Greensand, England), Coloborhynchus clavirostris (Valanginian Hastings Sands, England), and Tropeognathus mesembrinus (upper Aptian–lower Albian Romualdo Formation, Brazil) were resolved as successive sister taxa, which suggests that ornithocheirids were cosmopolitan during the Albian–Cenomanian. Furthermore, the stratigraphic age of Ferrodraco lentoni (Cenomanian–lower Turonian) implies that anhanguerians might have survived later in Australia than elsewhere.

Arcanumophis, a new genus and generic allocation for Erythrolamprus problematicus (Myers 1986), Xenodontinae (Colubridae) from the Cordillera de Carabaya, southern Peru

Zootaxa ◽  
2019 ◽  
Vol 4671 (1) ◽  
pp. 129-138 ◽  
Author(s):  
CHRISTOPHER R. SMAGA ◽  
ALEX TTITO ◽  
ALESSANDRO CATENAZZI
Keyword(s):  
New Genus ◽  
Original Description ◽  
Molecular Data ◽  
Sister Taxon ◽  
South American ◽  
Single Specimen ◽  
Snake Species ◽  
Southern Peru ◽  
The Status ◽  
Morphological And Molecular Data

The systematics of South American Xenodontinae snakes has experienced large changes and improvements as a result of recent studies employing molecular data. Herein we assess the status of the rare Peruvian snake species, Erythrolamprus problematicus (Dipsadidae, Xenodontinae, Xenodontini), previously known from a single specimen collected in 1950. Based on new morphological and molecular data from a second specimen that we collected, we confirmed the presence of a crease in the rostral scale, mentioned in the original description (a unique trait among the Xenodontini), and recovered E. problematicus as the sister-taxon of all other Xenodontini, instead of nested among the current Erythrolamprus. Therefore, our phylogenetic results justify the erection of a new genus to accommodate the species. 

A new genus and species of chirocephalid fairy shrimp (Crustacea: Branchiopoda: Anostraca) from Mongolia

Zootaxa ◽  
2005 ◽  
Vol 997 (1) ◽  
pp. 1 ◽  
Author(s):  
D. CHRISTOPHER ROGERS
Keyword(s):  
New Genus ◽  
Fairy Shrimp ◽  
New Genus And Species ◽  
Unique Form ◽  
General Morphology

Parartemiopsis mongolica genus et species novae is presented and described from two male specimens from Mongolia. The female is unknown or unrecognized at this time. This new genus and species has characteristics typical of the Chirocephalidae but is defined and separated from all other anostracan genera by the unique form of the genitalia. The general morphology of the second antennae and the genitalia bears similarities to those of Artemiopsis, Branchinectella, and Linderiella. In fact, the genitalia of Parartemiopsis are morphologically intermediate between those of Artemiopsis and Branchinectella, thus providing further evidence of the unity of the Chirocephalidae. A reorganization of the Chirocephalidae into two subfamilies, Chirocephalinae and Artemiopsinae is proposed. The genus Galaziella is tentatively accepted as part of the Chirocephalinae.

Auranticarpa, a new genus of Pittosporaceae from northern Australia

2000 ◽  
Vol 13 (6) ◽  
pp. 903 ◽  
Author(s):  
Lindy W. Cayzer ◽  
Michael D. Crisp ◽  
Ian R. H. Telford
Keyword(s):  
New Genus ◽  
Monophyletic Group ◽  
New Combinations ◽  
Northern Australia ◽  
The Family ◽  
Cladistic Analyses ◽  
First Time

Following the revision of the family Pittosporaceae in Australia, a new genus, Auranticarpa, is described and monographed here to accommodate a monophyletic group excluded from Pittosporum in cladistic analyses. Auranticarpa occurs mostly in monsoonal northern Australia, and has six species. New combinations are provided for three taxa previously placed in Pittosporum: A. melanosperma, A. resinosa (reinstated this analysis) and A. rhombifolia; and three are described for the first time: A. edentata, A. ilicifolia and A. papyracea.

scholarly journals A new genus and species of rhinatrematid caecilian (Amphibia: Gymnophiona: Rhinatrematidae) from Ecuador

2021 ◽  
pp. 27-34
Author(s):  
Mark Wilkinson
Keyword(s):  
New Genus ◽  
Sister Taxon ◽  
New Taxon ◽  
Single Specimen ◽  
New Genus And Species ◽  
Limited Knowledge ◽  
The Andes ◽  
The Poor ◽  
Distinctive Morphology

A new genus and species of rhinatrematid caecilian, Amazops amazops gen. et sp. nov., is described based on a single specimen from Orellana, Ecuador collected in 1990. Among other features the new taxon differs from all other rhinatrematid caecilians in having less than four annular grooves interrupted in the region of the vent and in the squamosal contributing to the bony margin of the orbit. A consideration of its distinctive morphology suggests that it is plausible that the new taxon is the sister taxon of all other rhinatrematid caecilians. That the genus is known from a single specimen, and that this is the first new rhinatrematid species from the Andes described for more than 50 years, highlights the poor sampling (collecting) of rhinatrematid caecilians and limited knowledge of their diversity.

Redescription of the rare shrimp Heterocarpus nesisi (Burukovsky, 1986 (Crustacea: Caridea: Pandalidae) rediscovered off western Mexico, with the proposal of a new genus

Zootaxa ◽  
2019 ◽  
Vol 4565 (1) ◽  
pp. 49 ◽  
Author(s):  
M.E. HENDRICKX
Keyword(s):  
Deep Water ◽  
Rare Species ◽  
New Genus ◽  
Baja California ◽  
Lower Boundary ◽  
Mature Male ◽  
General Morphology ◽  
Western Mexico ◽  
Minimum Zone ◽  
Oxygen Minimum

A rare species of pandalid shrimp, Heterocarpus nesisi Burukovsky, 1986, is rediscovered in deep water off western Mexico. Previous to this capture, this species was known only from the holotype, a mature male captured at 800 m depth, originally described in the genus Heterocarpus and later transferred to Plesionika. A second, unconfirmed record, was provided in 1989: a female captured at 898 m near the southern tip of the Baja California Peninsula. Heterocarpus nesisi is redescribed and appendages are illustrated. The general morphology of this species makes it difficult to fit within Heterocarpus or Plesionika, and a new genus, Heteronika gen. nov., is proposed to accommodate it. Heteronika nesisi is associated with the lower boundary of the Oxygen Minimum Zone occurring off western Baja California. 

Tribelocodia ashei, new genus and new species of Reduviidae (Insecta: Hemiptera), has implications on character evolution in Ectrichodiinae and Tribelocephalinae

2010 ◽  
Vol 41 (2) ◽  
pp. 103-122 ◽  
Author(s):  
Christiane Weirauch
Keyword(s):  
New Species ◽  
New Genus ◽  
Cladistic Analysis ◽  
Digital Photography ◽  
Character Evolution ◽  
Sister Taxon ◽  
New Genus And Species ◽  
Neotropical Species ◽  
French Guyana ◽  
Scanning Electron

AbstractA new genus and species of Reduviidae, Tribelocodia ashei gen.n., sp.n, are described from French Guyana. The relationships of Tribelocodia are analyzed within the context of a morphology-based cladistic analysis of Reduviidae. The new genus is placed within the clade Ectrichodiinae+Tribelocephalinae and shows a bizarre combination of characters thought synapomorphic for either Ectrichodiinae or Tribelocephalinae. The analyses support Tribelocodia as the sister taxon to the enigmatic African Xenocaucini within Tribelocephalinae. Tribelocodia ashei, therefore, represents the first Neotropical species of this otherwise Paleotropical group. Implications for character evolution of Ectrichodiinae and Tribelocephalinae are discussed and the diagnosis of Tribelocephalinae is revised. Scanning electron and digital micrographs are provided for Tribelocodia ashei. The holotype of Xenocaucus mancinii China and Usinger, 1949 (Xenocaucini) and a specimen of Ectrichodiella minima (Valdes, 1910), which may represent the sister taxon to the remaining Ectrichodiinae, are illustrated using digital photography.

Diplocephalus komposchi n. sp., a new species of erigonine spider (Araneae, Linyphiidae) from Austria

Zootaxa ◽  
2017 ◽  
Vol 4268 (2) ◽  
pp. 296
Author(s):  
NORBERT MILASOWSZKY ◽  
JULIA BAUDER ◽  
MARTIN HEPNER
Keyword(s):  
New Species ◽  
Sister Taxon ◽  
Phylogenetic Study ◽  
Cladistic Analyses ◽  
Group D ◽  
A New Species

The erigonine cladistic analyses of Hormiga (2000) and Miller & Hormiga (2004) demonstrated unambiguous support for a sister-taxon relationship between the genera Diplocephalus and Savignia. These genera, in addition to others, are commonly placed in the Savignia-group. Although the Savignia-group is not monophyletic as it was originally circumscribed by Millidge (1977), it contains a monophyletic core of genera that has been supported in various cladistic analyses, starting with Hormiga (2000). According to the most recent phylogenetic study (Frick et al. 2010), a clade within the Savignia-group included Diplocephalus along with Araeoncus, Dicymbium, Erigonella, Glyphesis and Savignia. Frick et al. (2010) included three Diplocephalus species – cristatus, latifrons and picinus – in their cladistic analyses. While D. latifrons and D. picinus were found to be the most basal species of the Savignia-group, D. cristatus was the most distal one.

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