The entire control region (c. 989 nucleotides) of the mitochondrial genome of Farfantepenaeus duorarum with parts of its flanking genes (tRNAile and 12S-rRNA) has been amplified, sequenced, and compared to the published sequence of F. notialis. The sequence length and nucleotide composition appear well conserved. The estimated value of Kimura 2-parameter distance reaches 0.079 between both species of shrimp and 0.006-0.026 among conspecific individuals of F. duorarum. However, statistical evaluation of genetic distance data and parsimony analysis of sequences indicate significant differences between the two species. Parsimony analysis of sequences from six F. duorarum collected along the Atlantic coast and the coast of the Gulf of Mexico, does not reflect the geographic distribution of the specimens.
The paper discusses recent drastic changes in the composition of Polish gammarid fauna, that occurred at the end of 20th century. This change was caused by the invasion of five alien species - four of Ponto-Caspian origin (Dikerogammarus haemobaphes, D. villosus, Obesogammarus crassus and Pontogammarus robustoides) and one of American origin (Gammarus tigrinus). Probable invasion routes are presented.
Echinogammarus trichiatus (Martynov, ), was recorded for the first time in Poland, in the lower Oder River, in September 2012. The species has most probably reached the Oder through the Havel-Oder Canal, being a part of the German inland canal system in which it has been already present since 2006. We found individuals of both sexes, including ovigerous females and juveniles. The structure of its population and its abundance (second dominant gammarid species on the site) suggests that it is well established and, thus, we may expect further invasion of the species into Polish waters. Six other invasive species of amphipods were recorded along the course of the Oder. Four of them, Dikerogammarus villosus, D. haemobaphes, Gammarus tigrinus and Chelicorophium curvispinum, occurred in the entire studied section of the river. Two, Pontogammarus robustoides and Obesogammarus crassus, were found only in the lowest part of the Oder.
The genus Atyaephyra de Brito Capello, 1867 consists of seven species, which are distributed in Europe, Asia Minor and northern Africa. Four of them occur on the Balkan Peninsula, which is known as one of the global diversity and endemism hotspots for freshwater fauna. Atyaephyra thyamisensis Christodoulou, Antoniou, Magoulas & Koukouras, 2012 has been known from Greek mainland and is considered as endemic to the Ionian region. Herewith we report the first finding of this species from the Adriatic region, i.e., Albania and Republic of Macedonia, including the ancient Lake Prespa, and we provide new localities from Greece. Given the subtle morphological features differing this species from other congeners, we support our findings with DNA barcodes.