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The lesser-known medusa Drymonema dalmatinum Haeckel 1880 (Scyphozoa, Discomedusae) in the Adriatic Sea
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The lesser-known medusa Drymonema dalmatinum Haeckel 1880 (Scyphozoa, Discomedusae) in the Adriatic Sea
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Journal Article
The lesser-known medusa Drymonema dalmatinum Haeckel 1880 (Scyphozoa, Discomedusae) in the Adriatic Sea
2014
Overview
Authors report historical and recent records of the little-known medusa Drymonema dalmatinum in the Adriatic Sea. This large scyphomedusa, which may develop a bell diameter of more than 1 m, was first described in 1880 by Haeckel based on four specimens collected near the Dalmatian island Hvar. The paucity of this species records since its description confirms its rarity, however, in the last 15 years sightings of D. dalmatinum have been more frequent.Original Abstract: Gli autori riportano segnalazioni storiche e recenti della poco conosciuta medusa Drymonema dalmatinumnel mare Adriatico. Questa grande scifomedusa, che puo sviluppare un cappello di diametro di oltre 1 m, e stata descritta per la prima volta nel 1880 da Haeckel, in base a quattro esemplari catturati vicino all'isola di Lesina (Hvar) in Dalmazia. La scarsita delle segnalazioni di questa specie dalla sua prima descrizione conferma la sua rarita. Tuttavia, negli ultimi 15 anni gli avvistamenti di D. dalmatinum sono stati piu frequenti. Avtorji v prispevku predstavljajo malo znano klobucnjasko meduzo Drymonema dalmatinum (dalmatinska lasasta meduza). Prvic jo je opisal Haeckel (1880) ravno na osnovi vzorcev meduz iz Jadranskega morja. Klobuk dalmatinske lasaste meduze lahko doseze premer preko enega metra, vendar so bili primerki iz Jadranskega morja manjsi, najvecji so imeli premer okoli 60 cm. Na osnovi historicnih virov in novejsih opazovanj avtorji v prispevku podajajo casovni pregled opazovanj te meduze od konca 19. stoletja do danes. Stiasny (1940b) je predlagal 30-letni ciklus pojavljanja, vendar smo v zadnjih desetletjih zabelezili pojave l. 1984, 2001, 2010 in 2014. Dalmatinska lasasta meduza je bila bolj pogosto zabelezena v juznem Jadranu, opazovani primerki pa so bili manjsih dimenzij kot v severnem Jadranu, kar nakazuje njen transport z vodnimi masami ob vzhodnojadranski obali proti severu. Podatki iz literature kazejo, da so pomemben plen dalmatinske lasaste meduze uhati klobucnjaki, za katere v obdobju po letu 1980, zlasti pa po l. 2000, v severnem Jadranu ugotavljamo pogostejse masovno pojavljanje.
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