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1.
Zootaxa ; 4751(3): zootaxa.4751.3.9, 2020 Mar 18.
Artigo em Inglês | MEDLINE | ID: mdl-32230411

RESUMO

Specimens housed in the Australian Museum assigned to the genus Stylopallene are reviewed on the basis of their questionable geographic locations in the tropical waters of north Western Australia. Re-examination of those specimens shows only a superficial resemblance to the genus Stylopallene. The new genus Labrumoides gen. nov. is erected to accommodate those specimens and a new species L. vibrissa sp. nov. is described. Cheilopallene hirta previously assigned to genus incertae sedis is provisionally reassigned to the new genus.


Assuntos
Artrópodes , Animais , Austrália , Austrália Ocidental
2.
Zootaxa ; 4567(3): zootaxa.4567.3.1, 2019 Mar 18.
Artigo em Inglês | MEDLINE | ID: mdl-31715881

RESUMO

This report addresses sixty-two deep-sea pycnogonid specimens collected by the Southwest Indian Ocean Seamounts Expedition, November 7 to December 21, 2011 on-board the British research vessel R.S.S. James Cook (voyage numbers JC066, JC067). Pycnogonids were collected from four of six geological features sampled along the central section of the Southwest Indian Ridge (SWIR) in an area approximately 1500 km south-south east of Madagascar. Specimens were mostly gathered utilizing a remotely operated vehicle (ROV) and tethered video-sediment grab platforms. Additional specimens were gathered from sediment cores or hand-picked from whale bone and wood-fall experiment nets and mooring buoy ropes. Fifteen new species are described, illustrated and compared with their nearest relatives. Two previously described species belonging to the genera Colossendeis and Austrodecus are recorded. A specimen of Austrodecus bamberi represents the first record of the female and is the only species in the collection previously known from the SWIR. One species of Colossendeis remains unnamed pending further analysis. One subadult specimen of Sericosura showing strong morphological affinity with a specimen previously recorded from the Walvis Ridge remains undescribed pending availability of further material. One subadult specimen is tentatively assigned to Nymphon. Specimens are assigned to six families and eight genera. Colossendeis rostrata is synonymised with C. melancholicus. The methodology of counting palp segments in the genera Austrodecus and Rhynchothorax is reviewed.


Assuntos
Artrópodes , Animais , Feminino , Oceano Índico , Madagáscar
4.
Zootaxa ; 3995: 51-7, 2015 Aug 05.
Artigo em Inglês | MEDLINE | ID: mdl-26250302

RESUMO

The genus Cheilopallene is reviewed. Three species are assigned to species incertae sedis pending further analysis. Specimens from Lizard Island, Queensland, previously identified as C. nodulosa are reassigned to C. brevichela. Suspected sexual dimorphism represented by the presence of a chelifore scape node in female C. nodulosa is supported by the finding of the same dimorphism in C. brevichela and in a new species from Milne Bay, Papua New Guinea. It is likely that the presence of a chelifore scape node is a diagnostic character of all females in the genus Cheilopallene. An amended diagnosis is provided.


Assuntos
Artrópodes/classificação , Distribuição Animal , Estruturas Animais/anatomia & histologia , Estruturas Animais/crescimento & desenvolvimento , Animais , Artrópodes/anatomia & histologia , Artrópodes/crescimento & desenvolvimento , Tamanho Corporal , Ecossistema , Feminino , Masculino , Tamanho do Órgão , Papua Nova Guiné
5.
Zootaxa ; 3765: 339-59, 2014 Feb 19.
Artigo em Inglês | MEDLINE | ID: mdl-24870905

RESUMO

Analysis of three northern hemisphere Boreal-Arctic species of Pseudopallene has shown that those species are morphologically distinguishable from their congeners in Australian waters. The holotypes of Australian species Pseudopallene laevis, Pseudopallene ambigua and Pseudopallene harrisi are compared with each other and with additional material from southern Australia. Sixteen species of Pseudopallene are assigned to a new genus Meridionale. Meridionale dubia is assigned to species inquirenda. The genus Cordylochele Sars, 1888 is resurrected. A diagnosis of each genus is provided along with additional figures. A brief summary of the systematic position of Pseudopallene up to the present time is provided. Three species are temporarily assigned to species incertae sedis pending further review.


Assuntos
Artrópodes/anatomia & histologia , Artrópodes/classificação , Animais , Feminino , Masculino , Especificidade da Espécie
6.
Genetics ; 185(1): 375-85, 2010 May.
Artigo em Inglês | MEDLINE | ID: mdl-20194964

RESUMO

The genetic architecture of variation in evolutionary fitness determines the trajectory of adaptive change. We identified quantitative trait loci (QTL) affecting fitness in a mapping population of recombinant inbred lines (RILs) derived from a cross between moist- and dry- associated ecotypes of Avena barbata. We estimated fitness in 179 RILs in each of two natural environments in each of 4 years. Two loci account for over half of the variation in geometric mean fitness across environments. These loci are associated in repulsion phase in the wild ecotypes, suggesting the potential for strong transgressive segregation, but also show significant epistasis giving hybrid breakdown. This epistasis is the result of sharply lower fitness in only one of the recombinant genotypes, suggesting that the loci may contain synergistically acting mutations. Within each trial (year/site combination), we can explain less of the variation than for geometric mean fitness, but the two major loci are associated with variation in fitness in most environments. Tests for pleiotropic effects of QTL on fitness in different environments reveal that the same loci are under selection in all trials. Genotype-by-environment interactions are significant for some loci, but this reflects variation in the strength, not the direction of selection.


Assuntos
Mapeamento Cromossômico , Meio Ambiente , Epistasia Genética , Poaceae/genética , Locos de Características Quantitativas/genética , Seleção Genética , Alelos , Teorema de Bayes , Aptidão Genética , Ligação Genética , Genótipo , Funções Verossimilhança , Modelos Genéticos
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