We describe a new species of an amphipod Niphargus zagorae sp. n. and redescribe its nearest relative and morphologically similar species N. boskovici S. Karaman, 1952. We present the geographic distributions of both species, morphological diagnoses and infer their phylogenetic position within the genus based on COI, 28S and H3 markers.
Gammarus aequicauda (Martynov, 1931) (Amphipoda, Gammaridea) is known as an euryhaline and euryvalent species in warm temperate waters, including lagoon systems and shallow coastal waters. The estuary of the River Jadro is a part of Kastela Bay (Adriatic Sea), and after construction works on the downstream watercourse of the river, some ecological conditions have changed. A concrete barrier that was built decreases the influence of fresh water, which resulted in an increased salinity and a raised level of dissolved organic compounds. Such conditions were favourable for macroalgae, especially Enteromorpha sp., thus overgrowing riversides and providing amphipods with food and protection against predators. There are no earlier published data confirming the presence of G. aequicauda in Kastela Bay. This is the first record of G. aequicauda from the River Jadro estuary as well as the first record of the species for Croatian rivers in general.
RÉSUMÉGammarus aequicauda (Martynov, 1931) (Amphipoda, Gammaridea) est connue comme une espèce euryhaline et euryvalente des eaux tempérées chaudes, qui incluent les systèmes lagunaires et les eaux côtières peu profondes. L'estuaire de la rivière Jadro forme une partie de la baie de Kastela (mer Adriatique), et après des travaux de construction sur le cours aval de la rivière, certains paramètres écologiques ont été modifiés. Un mur de béton qui a été construit diminue l'influence de l'eau douce, d'où résulte une salinité augmentée et un niveau plus élevé des composés organiques dissous. De telles conditions ont été favorables au développement des macro-algues, en particulier Enteromorpha sp., qui ont envahi les rives de la rivière et fourni aux amphipodes de la nourriture et une protection contre les prédateurs. U n'y a pas de données publiées antérieures confirmant la présence de G. aequicauda dans la baie de Kastela. C'est ainsi la première mention de G. aequicauda
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