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First record of Munidopsis acutispina Benedict, 1902 (Decapoda, Anomura, Galatheidae) in the Mediterranean Sea
No full textFirst record of Munidopsis acutispina Benedict, 1902 (Decapoda, Anomura, Galatheidae) in the Mediterranean Sea
No full textThe minute squat lobster Munidopsis acutispina Benedict, 1902 is recorded for the first time from bathyal grounds in the Mediterranean Sea. It can easily be distinguished from the two species of Munidopsis previously known from the Mediterranean, for the surface of the carapace covered with squamous spiniform tubercles. As the available illustrations of M. acutispina are somehow inadequate, the species is briefly redescribed and illustrated based on the new material and compared with its closest relatives, that are found in the western Atlantic and eastern Pacific Oceans
Food partitioning between Serranus scriba and Scorpaena porcus (Perciformes) on the infralittoral ground of the South Tyrrhenian Sea.
No full textPrime osservazioni sulla organizzazione del testicolo di Trisopterus minutus capelanus
No full textTestis of the Teleostean fish Trisopterus minutus capelanus has been examined to study the organization of the seminiferous tubules and the ultrastructural features of the germ cells. The testis is shown to be composed of seminiferous tubules full of cells: only few of them have just a very narrow lumen. Each tubule is divided by thin septa of connective tissue in zones containing homogeneous cells; such an organization is confirmed by ultrastructural images showing groups of synchronously developing germ cells. By morphological characterization of the germ cells found in each zone, 6 maturation stages have been identified. During spermiogenesis, a progressive shrinkage of germ cells and a nuclear chromatin condensation have been observed. Intercellular bridges, homogeneously dispersed granules of glycogen and groups of mitochondria associated with dense granular material have been described. Such features are present in the earlier stages of spermiogenesis and are retained until the l..
Feeding habits of Trisopterus minutus capelanus (Lacepede, 1800) (Osteichthyes, Gadidae) in the North Adriatic Sea
No full textThe paper examines the diet's composition of Trisopterus minutus capelanus A total of. 303 specimens have been captured in the north Adriatic sea all year long. This is a nekto-benthic species and it prefers Crustacea and Teleostea. There are some less important diet constituent like Polichaeta, Bivalvia and Cephalopoda. Crustacea are prevalent always, but decrease in winter and reproductive period, conversely to Teleostea
Genetic differentiation of European species of Liocarcinus (Crustacea: Portunidae): A gene-enzyme study
No full textPopulations of L. depurator from Greek and Scottish seas as well as samples of L. marmoreus from Scotland, were allozymatically analyzed. Their genetic structure was then compared with our previous analyses of Liocarcinus species, to test genetic similarities and to supply new statistical elaborations that would better define genetic differentiations and give some hints on phyletic relationships within the genus. New analyses suggest a subspecific splitting of L. depurator and also give support to the allocation of present Liocarcinus taxa to different genera. More precisely, it has been possible to define three generic groupings: the first group comprises L. marmoreus and L. vernalis, together with the type species of the genus L. holsatus, and it could be referred to as Liocarcinus [sensu stricto]; the second group contains L. depurator and, presumably, also the morphologically related L. bolivari; the third group consists of L. I maculatus and L. arcuatus. Allozyme data on genetic differentiation agree almost exactly with a recently subdivision of the genus Liocarcinus, proposed mainly on morphological evidences. Necora puber, which, up to 1987, was included in Liocarcinus, appears to be representative of a distinct genus
Aspetti e problemi della biologia e della pesca di Ensis minor (Chenu) nel Golfo di Trieste.
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The freshwater crayfish Austropotamobius pallipes (Decapoda: Astacidae) in Campania Region: a survay with the report of new stations
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