Les caryotypes de trois planaires marines nord-américaines : contribution à la phylogénie et à la classification du groupe (Platyhelminthes, Turbellaria, Tricladida)

1976 ◽  
Vol 54 (5) ◽  
pp. 644-651 ◽  
Author(s):  
Ian R. Ball
Keyword(s):  
Data Support ◽  
Diploid Complement ◽  
Taxonomic Decision ◽  
Procerodes Littoralis ◽  
Phylogenetic Character ◽  
First Time ◽  
Basic Numbers

The karyotypes of three species of marine planarians have been studied, this being the first time that karyometric data have been made available for this group. Procerodes littoralis has a diploid complement of 14 metacentric chromosomes. Uteriporus vulgaris and Foviella affinis both have diploid complements of 16 more-or-less metacentric chromosomes. The karyotypes of V. vulgaris and F. affinis are virtually identical and the data support a prior taxonomic decision to remove Foviella from the Procerodidae and to classify it within the Uteriporidae. So little is known of the karyotypes of the Maricola and the Proseriata, and the basic numbers are so varied, that it is impossible to use the karyotype as a prior phylogenetic character, even in the freshwater triclads, which have been so well studied.

Sandsitermes gen. nov., a new nasute termite genus from South America (Isoptera, Termitidae, Nasutitermitinae)

Zootaxa ◽  
2017 ◽  
Vol 4221 (5) ◽  
pp. 562
Author(s):  
CAROLINA CUEZZO ◽  
ELIANA M. CANCELLO ◽  
TIAGO F. CARRIJO
Keyword(s):  
South America ◽  
New Genus ◽  
Taxonomic Decision ◽  
Morphological Differences ◽  
Worker Castes ◽  
First Time

We establish herein a new genus of Neotropical termites of the subfamily Nasutitermitinae, Sandsitermes gen. nov.. The new genus accommodates a previously described species, Nasutitermes robustus (Holmgren), and is diagnosed by worker characters, including the mandibles, the gut-coiling configuration in situ, and the pattern of cushions and spines of the enteric valve. We characterized and illustrated the imago for the first time and redescribe the soldier and worker castes of Sandsitermes robustus gen. et comb. nov. from syntypes and other samples from eastern Peru. We support our taxonomic decision, presenting morphological differences between the gut pattern and enteric valve of S. robustus and 13 neotropical Nasutitermes species studied for this report, and discuss possible relationships with other neotropical nasute termites. 

Karyotype of Propsilocerus akamusi (Tokunaga) from China (Diptera: Chironomidae)

Zootaxa ◽  
2004 ◽  
Vol 765 (1) ◽  
pp. 1 ◽  
Author(s):  
IYA I. KIKNADZE ◽  
XINHUA WANG ◽  
ALBINA G. ISTOMINA
Keyword(s):  
Polytene Chromosomes ◽  
Banding Patterns ◽  
Chinese Populations ◽  
Data Support ◽  
Cytogenetic Data ◽  
Karyotype Structure ◽  
Chromosomal Polymorphisms ◽  
First Time

The karyotype structure and banding patterns of the polytene chromosomes of Propsilocerus akamusi from China are investigated for the first time. Photographic maps of the three chromosomes of P. akamusi are presented. Three heterochromatic blocks in the centromere regions are characteristic of this species. Chromosomal polymorphisms were not found in the Chinese populations. Cytogenetic data support the phylogenetic argument previously outlined for the genus.

scholarly journals Check-list of chromosome numbers of the family Hygromiidae (Gastropoda: Stylommatophora) with new data on Circassina frutis

2021 ◽  
Vol 64 (2) ◽  
pp. 7-20
Author(s):  
Nana Bakhtadze ◽  
Nino Gabroshvili ◽  
Levan Mumladze ◽  
Nino Gabroshvili
Keyword(s):  
Chromosome Number ◽  
Chromosome Numbers ◽  
Land Snail ◽  
Haploid Number ◽  
Check List ◽  
Fundamental Number ◽  
Diploid Complement ◽  
The Family ◽  
Karyotype Formula ◽  
First Time

Chromosome number data on the Hygromiidae (Gastropoda: Stylommatophora) are summarized and reviewed briefly in the context of the phylogeny of the family. In hygromiids, the haploid chromosome numbers range from 21 to 26. It is supposed that n = 21 is the ancestral chromosome number in the family. The modal haploid number for Hygromiidae is 23. Description of karyotype in terms of chromosome number and morphology of hygromiid land snail Circassina frutis is provided for the first time. The diploid chromosome number of this species is 2n = 46. The karyotype is symmetric and consists of 21 pairs of metacentric and 2 pairs of submetacentric chromosomes. The karyotype formula is as follows: 2n = 42m + 4sm (n = 21m + 2sm). The fundamental number (FN) is 92. Chromosomes range in length from 2.53 μm for the smallest pair to 6.00 μm for the largest pair. The total length of chromosomes in diploid complement (TCL) is 170.40 ± 3.22 μm.

scholarly journals Taxonomic decision as a compromise: Acasis appensata (Eversmann, 1832) in Central Italy—a case of conflicting evidence between DNA barcode and morphology (Lepidoptera: Geometridae)

Zootaxa ◽  
2011 ◽  
Vol 3070 (1) ◽  
pp. 60 ◽  
Author(s):  
AXEL HAUSMANN ◽  
PETER HUEMER
Keyword(s):  
Central Italy ◽  
Dna Barcode ◽  
Taxonomic Status ◽  
Female Genitalia ◽  
External Appearance ◽  
Male And Female ◽  
Conflicting Evidence ◽  
Taxonomic Decision ◽  
First Time ◽  
Range Of Variation

Acasis appensata (Eversmann, 1842) (Lepidoptera: Geometridae), distributed from central and northern Europe to eastern Asia, was collected in the Mediterranean (Central Italy, Abruzzi) for the first time. Adults from this region differ significantly from nominotypical populations in external appearance and in the 5’ barcode fragment of the CO1 gene (barcode). However, morphology of male and female genitalia falls completely within the range of variation of A. appensata, resulting in conflicting evidence with respect to its taxonomic status. Considering the striking differences in genitalia morphology between the two European species of Acasis, viz. A. appensata and A. viretata (Hübner, 1799), the population from the Abruzzi is not validated as different at species level but described as the subspecies A. appensata callaina ssp. nov. The habitus and male and female genitalia of European taxa are figured.

The karyology of the genus Procerodes (Tricladida: Maricola) in British waters

1979 ◽  
Vol 59 (4) ◽  
pp. 961-967 ◽  
Author(s):  
Lodovico Galleni ◽  
Ileana Puccinelli
Keyword(s):  
Diploid Number ◽  
Chromosome 4 ◽  
Haploid Number ◽  
Chromosome 5 ◽  
Centromeric Index ◽  
Diploid Complement ◽  
Procerodes Littoralis

A karyometric analysis of the diploid complement of two species of the genus Procerodes (Tricladida: Maricola), both from British waters, has been carried outThe diploid number of Procerodes littoralis, 2n = 14, was established on mitosis from regenerative blastema and the haploid number n = 7 from spermatocyte I stages. All the chromosomes are metacentric, their centromeric index varying from 47·91 in the chromosome 5 to 38·39 in the chromosome 4.

EARLY BRONZE AGE CHRONOLOGY OF MAINLAND GREECE: A REVIEW WITH NEW DATES FROM THE EXCAVATIONS AT KOUPHOVOUNO

2016 ◽  
Vol 111 ◽  
pp. 35-49 ◽  
Author(s):  
W. Cavanagh ◽  
C. Mee ◽  
J. Renard
Keyword(s):  
Bronze Age ◽  
Early Bronze Age ◽  
Bayesian Modelling ◽  
General Development ◽  
Radiocarbon Dates ◽  
Data Support ◽  
First Time ◽  
Modelling Approach

A series of radiocarbon dates for Early Bronze Age contexts from the excavations at Kouphovouno are published for the first time. By adopting a Bayesian modelling approach, the 14C estimates allow greater precision in arriving at an absolute chronology for the period. The opportunity is taken to place these dates as part of the more general development of the Early Bronze period. The sequence for mainland Greece is compared with the recently revised dating of the Early Cycladic period. The new data support a lower chronology than that advocated in recent publications.

scholarly journals Attention to the eyes and fear-recognition deficits in child psychopathy

2006 ◽  
Vol 189 (3) ◽  
pp. 280-281 ◽  
Author(s):  
Mark R. Dadds ◽  
Yael Perry ◽  
David J. Hawes ◽  
Sabine Merz ◽  
Alison C. Riddell ◽  
...  
Keyword(s):  
Psychopathic Traits ◽  
Innovative Approach ◽  
Data Support ◽  
Child Psychopathy ◽  
First Time

SummaryThe ability to recognise fear is impaired in people with damage to the amygdala and, interestingly, in adult psychopathy. Here we confirm that deficits in recognising fear exist in children with psychopathic traits. We show for the first time that, as with patients with amygdala damage, this deficit can be temporarily corrected by simply asking them to focus on the eyes of other people. These data support models of psychopathy that emphasise specific dysfunction of the amygdala and suggest an innovative approach for intervening early in the development of psychopathy.

scholarly journals Karyotype traits in Grindelia squarrosa (Pursh) Dunal (Asteraceae), an invasive plant in Romania

2012 ◽  
Vol 61 (1-6) ◽  
pp. 179-186 ◽  
Author(s):  
Elena Truta ◽  
Gabriela Vochita ◽  
Adrian Oprea ◽  
Culita Sirbu
Keyword(s):  
Chromosome Number ◽  
Invasive Plant ◽  
Chromosome Length ◽  
The Other ◽  
Diploid Chromosome Number ◽  
Diploid Complement ◽  
High Level ◽  
High Degree ◽  
First Time

Abstract The description of the karyotype features and idiogram in Grindelia squarrosa (Pursh) Dunal (Asteraceae), an invasive plant in Romania, are reported here for the first time. The diploid chromosome number is 2n=2x=12, in agreement with the data published for the other species of the genus. The karyomorphological data show that the complements of the studied genotypes have small chromosomes (mean chromosome length is X̅±SE=2.56±0.10 μm, and mean length of haploid complements is X̅±SE=15.33±0.69 μm, with a range of variability comprised between 12.87-17.51 μm). The karyotypes are made up of six pairs of metacentric and submetacentric chromosomes, with an identical formula of the diploid complement: KF=2n=12=8m+ 2sm + 2sm-SAT. Satellites are located on the short arms of the chromosomes of pair III. The karyotypes show a relatively high level of intra-specific uniformity as well as similar symmetry patterns (R=1.29-1.53; TF%=38.78-41.57%; AsI%=54.54-57.61%; A1 = 0.24- 0.32; A2=0.08-0.16), belonging to 1A and 2A classes of symmetry. The small size of the chromosomes, the presence of only two chromosome morphometric types, and the preponderance of metacentrics confer a relatively high degree of symmetry to the karyotypes studied.

scholarly journals Chromosome evolution in fishes: a new challenging proposal from Neotropical species

2014 ◽  
Vol 12 (4) ◽  
pp. 761-770 ◽  
Author(s):  
Mauro Nirchio ◽  
Anna Rita Rossi ◽  
Fausto Foresti ◽  
Claudio Oliveira
Keyword(s):  
Freshwater Fish ◽  
Marine Fish ◽  
Diploid Number ◽  
Diploid Complement ◽  
Actinopterygian Fishes ◽  
Fish Group ◽  
Acrocentric Chromosomes ◽  
The Mean ◽  
First Time ◽  
Single Laboratory

We present a database containing cytogenetic data of Neotropical actinopterygian fishes from Venezuela obtained in a single laboratory for the first time. The results of this study include 103 species belonging to 74 genera assigned to 45 families and 17 out of the 40 teleost orders. In the group of marine fishes, the modal diploid number was 2n=48 represented in 60% of the studied species, while in the freshwater fish group the modal diploid complement was 2n=54, represented in 21.21 % of the studied species. The average number of chromosomes and the mean FN were statistically higher in freshwater fish than in marine fish. The degree of diversification and karyotype variation was also higher in freshwater fish in contrast to a more conserved cytogenetic pattern in marine fish. In contrast to the assumption according to which 48 acrocentric chromosomes was basal chromosome number in fish, data here presented show that there is an obvious trend towards the reduction of the diploid number of chromosomes from values near 2n=60 with high number of biarmed chromosomes in more basal species to 2n=48 acrocentric elements in more derived Actinopterygii.

scholarly journals The carpology and taxonomy of some Chinese Corispermum (Amaranthaceae s.l.)

Phytotaxa ◽  
2014 ◽  
Vol 172 (2) ◽  
pp. 81 ◽  
Author(s):  
ALEXANDER P. SUKHORUKOV ◽  
MINGLI ZHANG ◽  
MAYA V. NILOVA
Keyword(s):  
New Species ◽  
New Variety ◽  
Fruit Anatomy ◽  
Data Support ◽  
First Time ◽  
Fruit Structure

Corispermum iljinii from Qinghai and Ningxia provinces and C. nanum from Xizang (Tibet) are described as new species. The new variety C. dutreuilii var. montanum is described. Lectotypes of C. declinatum, C. elongatum and C. macrocarpum have been designated. The fruit anatomy of 16 Chinese taxa has been investigated for the first time. Both molecular and carpological data support the specific status of C. ellipsocarpum. The general fruit structure of Corispermoideae is specified and discussed.

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