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Vol 41 Svsn.Pdf SOCIETÀ VENEZIANA DI SCIENZE NATURALI Lavori vol. 41 Venezia – Gennaio 2016 ISSN 0392 9450 La Società Veneziana di Scienze Naturali si è costituita a Venezia nel Dicembre 1975 . Autorizzazione Tribunale di Venezia n° 555 del 18 ottobre 1975 CONSIGLIO DIRETTIVO (uscente) Presidente della Società Giovanni Timossi Vice Presidente Giovanni Caniglia Consiglieri Botanica: Giovanni Caniglia Referente per Micologia: Enrico Bizio Didattica, Ecologia, Tutela ambientale: Manuela Travaglio Referente per Didattica e Biologia ambientale: Veronica Borsato Scienze della Terra e dell’Uomo: Bruno Bizzotto Referente per Preistoria: Sergio Marsale Zoologia: Lorenzo Munari Referente per Ornitologia: Alessandro Sartori Referente per Biologia marina: Tihana Marceta Segretario Tesoriere Anna Maria Confente Revisiori dei conti Luigi Bruni Corrado Lazzari Comitato scientifico di redazione: Giovanni Caniglia (Direttore), Fabrizio Bizzarini, Giampietro Braga, Paolo Canestrelli, Corrado Lazzari, Francesco Mezzavilla, Alessandro Minelli, Enrico Negrisolo, Michele Pellizzato Direttore responsabile della rivista Alberto Vitucci c/o Museo di Storia Naturale Fontego dei Turchi, S. Croce 1730 30135 Venezia (Italy) codice fiscale: 94072450276 Tel. 041 2750206 - Fax 041 721000 sito web: www.svsn.it e-mail: [email protected] Quote associative per l’anno 2016: Soci sostenitori € 50,00 Soci ordinari € 25,00 soci studenti (dai 15 ai 18 anni) € 15,00 soci giovani (fino ai 15 anni) € 4,00 soci famigliari € 10,00 enti, associazioni, ecc. € 50,00 Se si desidera ricevere per posta il volume dei lavori, aggiungere € 3 per spese di spedizione. Il versamento della quota potrà essere effettuato: – sul c/c postale n° 12899308 intestato a “Società Veneziana di Scienze Naturali - LAVORI” – con bonifico CODICE IBAN IT22 Q076 0102 0000 0001 2899 308 Stampato nel mese di febbraio 2016 presso la C.L.E.U.P. “Coop. Libraria Editrice Università di Padova” via Belzoni, 118/3 - 35121 Padova (tel. 049 8753496) www.cleup.it - www.facebook.com/cleup Lavori vol. 41 Foto di copertina: – in alto a sinistra: Hygrocybe turunda, Pian Cansiglio, torbiera AF6, 24.06.2015, foto E. Bizio – in alto a destra: Hypholoma elongatum, Pian Cansiglio, torbiera AF12, 24.09.2014, foto V. Borsato – in basso a sinistra: Panaeolus papilionaceus, Pian Cansiglio, lama AF18, 24.06.2015, foto V. Borsato – in basso a destra: Arrhenia onisca, Pian Cansiglio, torbiera AF12, 22.09.2014, foto V. Borsato MARCO ULIANA*, Prime segnalazioni di Cyrtarachne ixoides PAOLO PANTINI* *, * * * (Simon, 1870) (Araneae, Araneidae) LUISA DE SAVI per il Veneto e per l’Italia settentrionale Key words: Aracnida, Araneae, Cyrtarachne, new records, Italy. Riassunto Cyrtarachne ixoides (Simon, 1870) viene segnalato per la prima volta per l’Italia settentrionale sulla base di reperti della pianura veneta. Vengono inoltre raccolte e altre segnalazioni riportate sul web e documentate fotograficamente, che ampliano l’areale italiano finora noto. Abstract First records of Cyrtarachne ixoides (Simon, 1870) (Araneae, Araneidae) in Veneto and in Northern Italy Cyrtarachne ixoides (Simon, 1870) is recorded for the first time from Northern Italy, based on specimens observed or collected in the Venetian plain. The authors summarize several photographic records appeared on the web that extend the known Italian range for this species. Introduzione Cyrtarachne ixoides (Simon, 1870) è l’unico rappresentante europeo del genere Cyrtarachne. La sua distribuzione comprende il bacino del Mediterraneo dove è segnalato nella Penisola Iberica, in Francia, Corsica, Croazia, Grecia, Italia, Turchia fino alla Georgia ed ai territori meridionali della Russia europea (Nentwig et al., 2015). La specie è nota anche di Algeria (SIMON, 1929), Israele (LEVY, 1998) ed è stata segnalata in Madagascar da EMERIT (2000). Nel nostro paese C. ixoides è attualmente segnalato in Toscana (AUSSERER 1871; COLOMBO & MANUNZA, 2009), Lazio (BRIGNOLI, 1966), Campania (PAVESI, 1873; IJLAND & HELSDINGEN, 2014), Calabria (BRIGNOLI, 1967; CAFFI, 1895) e Sardegna (COLOMBO & MANUNZA, 2009; PANTINI et al., 2013). È una specie rara e con ecologia poco nota, la cui recente e ripetuta osservazione in Veneto ci ha spinto a redigere la presente nota faunistica. Oltre alle segnala- zioni venete abbiamo ritenuto utile riportare anche ulteriori dati a noi noti, in particolare numerose osservazioni documentate fotograficamente sul forum web Natura Mediterraneo (Forum Natura Mediterraneo, 2015). L’habitus particolare di questa specie ne consente infatti una facile identifica- * Museo di Storia Naturale di Venezia, zione anche su base fotografica. S. Croce 1730, 30135 Venezia, e-mail: [email protected] Materiale esaminato ** Museo Civico di Scienze Veneto. Moriago della Battaglia (TV), Palù, 45°52’21”N 12°05’60”E, su Phrag- Naturali “Enrico Caffi”, Piazza mites sp. presso corso d’acqua,1Ƃ25.VII.2015, leg L. De Savi (collezione Museo Cittadella 10, 24129 Bergamo, e-mail: [email protected] di Storia Naturale di Venezia)(Fig. 1). Toscana. Scarlino (GR), Sotto Torre delle Civette, m 10, 42°50’44”N 10°46’35”E, *** Via Baracca, 13 Nervesa della Battaglia (TV), margine strada su Rubus sp., 1Ƃ7-17.VII.2008 leg. P. Pantini (collezione Museo e-mail: [email protected] civico di Scienze Naturali di Bergamo). Lavori Soc. Ven. Sc. Nat. - vol. 41: 5 - 8, Venezia, 31 gennaio 2016 5 2 1 3 4 5 Figg. 1-5. Cyrtarachne ixoides, reperti veneti. 1. Moriago della Battaglia (TV), Palù,25.VII.2015, foto L. De Savi. 2. Marcon (VE), 15.7.2013, foto M. Dalla Via. 3. Oasi LIPU Cave di Gaggio Nord (VE), 22 giugno 2014, foto M. Dalla Via. 4. Oasi LIPU Cave di Gaggio Nord (VE), 22 giugno 2014, foto L. De Savi. 5. Oasi WWF Valle Averto (VE), 28 giugno 2015, foto M. Uliana. 6 Lavori Soc. Ven. Sc. Nat. - vol. 41: 5 - 8, Venezia, 31 gennaio 2016 Esemplari fotografati Veneto. Marcon (VE), 45°34’19.3”N 12°18’42.6”E, su arbusti presso fiume Zero, 15.VII.2013, foto M. Dalla Via (Fig. 2). Gaggio di Marcon (VE), Oasi LIPU Cave di Gaggio Nord, 45°33’47”N 12°19’42”E, su arbusti presso stagno, 22.VI.2014, foto M. Dalla Via (Fig.3). Gaggio di Marcon (VE), Oasi LIPU Cave di Gaggio Nord, 45°33’50”N 12°19’39”E, su vegetazione presso stagno, 26.VII.2015, foto L. De Savi (Fig. 4). Venezia, periferia N di Favaro Veneto, 45°30’57’’N, 12°17’35’’E, su indumenti dopo escursione, 26.VII.2015, foto E. Stival. Lugo di Campagna Lupia (VE), Oasi WWF di Valle Averto, 45°21’36’’N, 12°08’27’’E, in prato umido, su Phragmites sp., 28.VII.2015, foto M. Uliana (Fig. 5). Segnalazioni web In Tab. 1 sono raccolte le segnalazioni, tutte documentate fotograficamente e verificate dagli autori, comparse nel forum Forum Natura Mediterraneo. Cia- scuna segnalazione è rintracciabile completando l’indirizzo “http://www.natu- Tab. 1. Segnalazioni per Cyrtarachne ixoides documentate sul forum web ramediterraneo.com/forum/topic.asp?TOPIC_ID=” con il rispettivo topic_id Forum Natura Mediterraneo. indicato in tabella. Regione Località Data ambiente Osservatore Topic_ID Toscana Cascina (PI) 4.VI.2013 boschetto a Ulmus sp. B. Guerrazzi 222786 Toscana Cascina (PI) 2011 boschetto a Ulmus sp. B. Guerrazzi 222786 Toscana Cascina (PI) 18.V.2014 - B. Guerrazzi 232002 Toscana Cascina (PI) 31.VII.2015 - B. Guerrazzi 256354 Toscana Coltano (PI) VII.2014 vegetazione presso canale F. Aiello 235983 Toscana Isola d’Elba, Portoferraio (LI) 3.VI.2010 - L. Forbicioni 114614 Toscana Livorno, dintorni 2009, 6.VI.2010 canneto E. Lucarelli 114614 Toscana Livorno, dintorni 3.VII.2010 canneto E. Lucarelli 118324 Toscana Roccamare (GR) 10-11.VII.2008 siepe di Rubus sp. G. Miceli 52957 Marche Montacuto (AN) 13.IX.2009 - G. Giovagnoli 92631 Lazio Roma, Lido di Ostia 5.VII.2012 canneto S. Gregg 181771 Mentana (RM), Macchia Gattaceca 140 Lazio 3.VIII.2011 su Rubus sp. C. Piredda 151462 m Lazio Roma, Castel Fusano 2004 - S. Gregg 3847 Lazio Roma, Riserva dell’Insugherata 17.VII.2010 - A. Morgutti 119585 Campania Pozzuoli (NA), Cuma, litorale domizio 29.VI.2009 macchia mediterranea G. Mayer 85540 Sardegna Ittiri/Usini (SS) 26.VII.2011 su foglia di canna S. Canu 150270 Sardegna Usini (SS), rio Mannu 20.VIII.2014 - S. Canu 238835 Sardegna Santa Teresa Gallura (OT) VII. 2009 acquitrino, su cannucce L. Lenzini 92076 Sardegna Santa Teresa Gallura (OT) 28.VII.2013 siepe L. Lenzini 212785 Sardegna Santa Teresa Gallura (OT) 18.VIII.2014 siepi L. Lenzini 238937 Sardegna Santa Teresa Gallura (OT) 29.VII.2013 su foglie di canna L. Lenzini 212716 Discussione I reperti indicati per il Veneto sono i primi noti per la regione e per l’Italia settentrionale; il reperto di Montacuto rappresenta la prima segnalazione per le Marche. Le informazioni disponibili sugli habitat frequentati dalla specie riguardano vegetazione cespugliosa o erbacea incolta spesso vicino ad ambienti acquatici; ambienti simili sono riportati anche da molte delle segnalazioni raccolte sul web. Lavori Soc. Ven. Sc. Nat. - vol. 41: 5 - 8, Venezia, 31 gennaio 2016 7 C. ixoides risulta difficilmente visibile a causa della sue dimensioni, della colorazione e forse delle abitudini prevalentemente notturne (Berland, 1927:11- 12). La colorazione è piuttosto criptica e diversi segnalatori riportano di averla inizialmente scambiata per un escremento di uccello. Queste osservazioni suggeriscono che le scarse conoscenze circa la distribuzione della specie siano imputabili prevalentemente alla mancanza di ricerche in ambienti idonei piuttosto che ad una estrema rarità delle popolazioni sul territorio.Tuttavia la sua recente osservazione a Valle Averto, area intensamente esplorata nel recente passato, con molte decine di visite condotte da Marco Uliana in particolare nel periodo 1994-2000, fa pensare, per quest’area, a una recente colonizzazione da parte della specie. Ringraziamenti Ringraziamo Maurizio Dalla Via ed Emanuele Stival per le segnalazioni da loro documentate, Francesco Ballarin e Claudio Codato che hanno facilitato la col- laborazione fra gli autori. Bibliografia AUSSERER A. (1871) – NeueRadspinnen.Verhandlungen der Kaiserlich-Königlichen Zoologisch-Botanischen Gesellschaft in Wien 21: 815-832.
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