Description of a new hydromedusa from the southwestern Atlantic Ocean, Bougainvillia pagesi sp nov (Cnidaria, Hydrozoa, Anthoathecata)

A new hydromedusa species of the genus Bougainvillia (Anthoathecata; Bougainvillidae) is described. Bougainvillia pagesi sp. nov. was collected in shallow coastal waters from southern Brazil (~25–26°S) and northern Argentina (~36–38°S). It differs from other species of the genus mainly by two characters: (i) relatively large size (up to ~20 mm wide and high) and (ii) voluminous folded hanging gonads at perradial walls of the manubrium and extending to the proximal region of the radial canals. Its cnidoma is similar to the other species of the genus, with desmonemes (undischarged capsules: 7.08–10.01 × 2.5–5.59 μm) at marginal tentacles and microbasic euryteles (undischarged capsules: 7.66–11.44 × 2.64–4.43 μm) and smaller (undischarged capsules <2 μm) desmonemes at oral tentacles.

[1]  H. Bigelow.  Medusae And Siphonophorae Collected By The U.s. Fisheries Steamer "albatross" In The Northwestern Pacific, 1906 , 2015 .

[2]  P. Meretta,et al.  Hydroid assemblages from the Southwestern Atlantic Ocean (34–42° S) , 2009 .

[3]  P. Schuchert.  The European athecate hydroids and their medusae (Hydrozoa, Cnidaria): Capitata Part 1 , 2008 .

[4]  H. Galea.  Hydroids and hydromedusae (Cnidaria: Hydrozoa) from the fjords region of southern Chile , 2007 .

[5]  F. Boero,et al.  Life cycle of Bougainvillia nana (Cnidaria: Hydrozoa: Bougainvilliidae) from Italy, including a discussion of Bougainvillia muscus in the Mediterranean Sea , 2007, Journal of the Marine Biological Association of the United Kingdom.

[6]  Jiaqi,et al.  On new species and records of Hydroidomedusae from the Changjiang River Estuary and its adjacent waters , 2007 .

[7]  Jin-Nan Huang,et al.  A survey on Hydroidomedusae from the upwelling region of southern part of the Taiwan Strait of China - I On new species and records of Anthomedusae , 2007 .

[8]  E. Zocchi,et al.  The problem of seasonality of benthic hydroids in temperate waters , 2006 .

[9]  Hu Jia-qi.  On New Genus,Species and Record of Laingiomedusae and Anthomedusae in Fujian Coast (Cnidaria,Hydroidomedusae) , 2006 .

[10]  F. Boero,et al.  An introduction to Hydrozoa , 2006 .

[11]  F. Boero,et al.  Fauna of the Mediterranean Hydrozoa , 2004 .

[12]  P. Forget,et al.  Ocean wave mapping from ERS SAR images in the presence of swell and wind-waves , 2004 .

[13]  Jia-qi Huang,et al.  A survey on Anthomedusae (Hydrozoa : Hydroidomedusae) from the Taiwan Strait with description of new species and new combinations , 2004 .

[14]  F. Boero,et al.  Synopsis of the families and genera of the Hydromedusae of the world, with a list of the worldwide species , 2000 .

[15]  P. Schuchert.  The marine fauna of New Zealand: athecate hydroids and their medusae (Cnidaria: Hydrozoa) , 1998 .

[16]  J. Bouillon.  Hydromedusae of the New Zealand Oceanographic Institute (Hydrozoa, Cnidaria) , 1995 .

[17]  Dale R. Calder.  Bougainvillia aberrans (Cnidaria, Hydrozoa), a new species of hydroid and medusa from the upper bathyal zone off Bermuda , 1993 .

[18]  J. Gili,et al.  Medusae (Hydrozoa, Scyphozoa, Cubozoa) of the Benguela Current (southeastern Atlantic) , 1992 .

[19]  Dale R. Calder.  Seasonal cycles of activity and inactivity in some hydroids from Virginia and South Carolina, U.S.A. , 1990 .

[20]  J. Bouillon.  Hydroméduses de la mer de Bismarck. (Papouasie Nouvelle-Guinée) Partie III: Anthomédusae - Filifera (Hydrozoa-Cnidaria) , 1978 .

[21]  C. Edwards.  The hydroid and the medusa Bougainvillia principis, and a review of the British species of Bougainvillia , 1966, Journal of the Marine Biological Association of the United Kingdom.

[22]  C. Edwards.  On the Hydroids and Medusae Bougainvillia Pyramidata and B. Muscoides , 1964, Journal of the Marine Biological Association of the United Kingdom.

[23]  C. Edwards.  The Hydroid of the Anthomedusa Bougainvillia Britannica , 1964, Journal of the Marine Biological Association of the United Kingdom.

[24]  L. Kramp,et al.  Synopsis of the Medusae of the World , 1961 .

[25]  W. Rees,et al.  A revision of the genus Bougainvillia (Anthomedusae) , 1961 .

[26]  M. Vannncci.  Hydrozoa e Scyphozoa existentes no instituto paulista de oceanografia , 1951 .

[27]  R. E. Foerster.  No. 12.: THE HYDROMEDUSÆ OF THE WEST COAST OF NORTH AMERICA, WITH SPECIAL REFERENCE TO THOSE OF THE VANCOUVER ISLAND REGION. , 1923 .