A cytogenetical study on Economidichthys pygmaeus Holly, 1929 (Pisces, Gobiidae), an endemic freshwater goby from Western Greece

A cytogenetic study was carried out on the chromosomes and the nuclear DNA content of the freshwater goby Economidichthys pygmaeus (Pisces, Gobiidae). The species is characterized by a 2n=46 karyotype consisting of 12 submetacentric and 11 subtelocentric chromosome pairs (NF=70). Major (45S) rDNA genes are terminal-centromeric located on the short arm of a single medium-small sized submetacentric pair as assessed by in situ hybridization, CMA3 staining, and Ag-NOR banding. The haploid (C-value) nuclear DNA content is 0.93±0.003 picograms. The cytogenetical data of E. pygmaeus were compared with those ones already available for other related gobies

Caprella scaura Templeton, 1836 sensu lato (Amphipoda: Caprellidae) in the Mediterranean

AbstractCaprella scaura, first described from Mauritius and later reported in several ‘forms’ from all over the world, has now been found in the central and eastern Mediterranean. The morphology shows no significant difference to the topotypical material. Specimens from Venice and Sicily have been studied in detail, the former also by cytogenetic methods.See also Electronic Supplement at: http://www.senckenberg.de/odes/06-03.ht

Classical and molecular cytogenetic characterization of allochthonous European bitterling Rhodeus amarus (Cyprinidae, Acheilognathinae) from Northern Italy

A cytogenetical study was carried out on 34 specimens of the European bitterling Rhodeus amarus (Teleostei: Cyprinidae, Acheilognathinae) from four rivers of the Venice district (NE Italy). This allochthonous fish species was accidentally introduced in the North-East of Italy about 20 years ago and is now rapidly spreading all over the rivers of the Northern part of the country. All the studied specimens are characterised by the same karyotype (2n=48: 8M + 20SM + 20ST), i.e., the typical one of the native populations of the species. However, a polymorphism in the number of NOR bearing chromosomes has been found. In fact, in addition to the main species-specific NORs, on the short arms of chromosome pair 7, two to five additional 18S rDNA sites have been revealed by FISH in different specimens. Sequential staining with silver nitrate, chromomycin A 3 and DAPI revealed that most of the additional sites are inactive and CMA 3-positive. Data herein reported confirm that in spite of an overall morphological karyological conservativeness, significant differences for the finer cytogenetic features can be found within the Acheilognathinae with the 2n=48 and NF=76 karyotype

Genetics of Slipper Lobsters

Aware of the paucity of genetic data avilable for slipper lobsters, in the following paragraphs, we review the cytogenetic and molecular data known for this family. Moreover, we integrate the scyllarid data with some examples of how genetic data have helped in volutionary studies and have been applied to pratical issue. especially those important to fisheris, for the closely related family Palinuridae

Genome size and AT-DNA content in thirteen species of Decapoda

The genome size (GS) and AT base pair content of thirteen species of Decapoda belonging to different genera (nephrops, homarus, Palinurus, Jasus, Scyllarides, Scyllarus, and Aristeomorpha) from four families (Nephropidae, Palinuridae, Scyllaridae, and Aristeidae) were determined by flow cytometry. A high variability of DNA content has been observed. The percentage content of AT in the studied species ranges from 34.92 in Homarus americanus to 47.46 in Palinurus elephas and most species have a value of about 40%. in the family Scyllaridae, tyhe correlation between DNA content and chromosome number supports the hypothesis of polyploidization events during karyotype evolution

Solitary fibrous tumor of all sites: outcome of late recurrences in 14 patients

BACKGROUND: We explore the pattern of late recurrence (LR) in solitary fibrous tumor (SFT), focusing on histopathologic characteristics, clinical presentation and patients (pts) outcome. METHODS: Clinical records of all pts with confirmed pathologic diagnosis of SFT treated at our Institution from 2005 to 2011 were reviewed. We analysed the data of pts who relapsed 6510 years after initial diagnosis. RESULTS: A total of 14 pts were identified. The primary site of origin was pleura (5 pts), pelvis (4 pts), head and neck (3 pts) and retroperitoneum (2 pts). Primary tumor was a typical SFT in 5 and a malignant SFT in 7 out of 12 pts whose tumor tissue was available for revision. The median time to first recurrence was 12 years (range 10-23). The first relapse was local in 11 cases, distant in 3. Five pts later developed distant metastases. Four out of 5 cases of typical SFT developed distant metastases in spite of their initial benign aspect. No patient was disease-free at the time of the analyses. CONCLUSION: Our series suggests that LR can occur in SFT and some cases can behave aggressively even in the absence of any primary morphologic evidence of malignancy. A prolonged follow-up may be advisable