Modeeria rotunda ( Quoy & Gaimard, 1827 )

Galea, Horia R., 2007, Hydroids and hydromedusae (Cnidaria: Hydrozoa) from the fjords region of southern Chile, Zootaxa 1597 (1), pp. 1-116 : 42-43

Modeeria rotunda ( Quoy & Gaimard, 1827)

(fig. 9G–J, table 7)

Dianea rotunda Quoy & Gaimard, 1827: 181 , pl. 6A figs 1–2.

Stegopoma fastigiatum Kramp, 1911: 383 ; Stechow, 1919: 72; 1923: 8; Fraser, 1944: 178, pl. 32 fig. 153; Ralph, 1957: 850, fig. 8N–O; Vervoort, 1959: 234, fig. 10; Rees & Rowe, 1969: 13; Naumov, 1969: 341, fig. 206; Vervoort, 1966:

115; 1972a: 42; Leloup, 1974: 7, fig. 5; Millard, 1975: 137, fig. 45A; Blanco et al., 2000a: 274, figs 10–11. Stegopoma medusiformis Hargitt, 1924: 491 , pl. 4 fig. 15. Campanularia fastigiata: Cornelius, 1982: 123 . Calycella fastigiata: Hincks, 1868: 208 , pl. 39 figs 3, 3A. Modeeria formosa Kramp, 1961: 129 ; Edwards, 1963: 457; 1973: 573. Modeeria rotunda: Edwards, 1963: 457 , fig. 1; Edwards, 1973: 573, figs 1–3; Millard, 1975: 137, fig. 45A; 1977: 4;

Hirohito, 1983: 19; Gili et al. 1989: 74, fig. 3C; El Beshbeeshy, 1991: 51, fig. 9; Ramil & Vervoort, 1992: 29, fig.

4A–B; Cornelius, 1995a: 109, fig. 24: Hirohito, 1995 (English text): 88, fig. 25A–C; Calder, 1997: 87; Brinckmann-

Voss & Arai, 1998: 61, fig. 12; Schuchert, 2000: 413; 2001a: 51, fig. 36; Peña Cantero & García Carrascosa, 2002:

52, fig. 10G–H; Vervoort & Watson, 2003: 31; Bouillon et al., 2004: 189, fig. 105D–K; Vervoort, 2006: 219, fig. 18. Tiaranna rotunda: Russell, 1940: 517 , figs 11–13; 1953: 219, figs 117, 118A, B, 119; Kramp, 1959: 130, fig. 143; 1961:

130; Edwards, 1963: 457, fig. 1; Kramp, 1968: 61, fig. 159; Russell, 1970: 252. Turris rotunda: Mayer, 1910: 124 .

Material examined. Stn. COM 03 —21.i.2006, 17– 21 m, S154: several sterile colonies, epizoic on two plumes of Plumularia setacea and on small fragments of wood ( MHNG INVE 53476). Stn. IVM — 28.iii.2005, S26 (20 m): a sterile colony, epizoic on Obelia dichotoma , 2 slides ( MHNG INVE 53185); S32 (25 m): a sterile colony, epizoic on Obelia dichotoma ( MHNG INVE 53194). Stn. CFQ — 29.iii. 2005, 32 m, S40: a fertile colony, epizoic on Bougainvillia pyramidata ( MHNG INVE 53204); S45: a fertile colony, epizoic on stems of unidentifiable tubulariid and Bougainvillia pyramidata . Stn. SWA — 15.iii. 2006, 25 m, S131: a sterile colony, on unidentified substrate. Stn. CFA — 14.iii.2006, 10– 30 m, S88: sterile colonies epizoic on Clytia linearis and Lafoea dumosa . Stn. AIN — 11.iii. 2006, 24 m, S117: small, sterile colony, composed of several hydrothecae, epizoic on Plumularia setacea ( MHNG INVE 53372). Stn. ICA — 13.iii. 2006, 20 m, S137: a small, sterile colony, epizoic on Halopteris schucherti . Stn. CCO — 09.iii.2006, 0–20 m, S140: several sterile colonies, epizoic on Synthecium robustum and Parascyphus repens . Stn. CPI — 07.iii. 2006, 24 m, S121: some hydrothecae, without gonothecae, epizoic on Synthecium robustum .

Type locality. Strait of Gibraltar (no exact locality) .

Remarks. The present hydroid material agrees perfectly with the available descriptions of this species ( Edwards 1973, Russell 1953). The nematocyst complement of the medusa was studied by Russell (1940). The size of hydrotheca and length of pedicel may vary greatly (see table 7). Although the hydroid is frequent in the study area, no medusae were collected from plankton.

Hydroid epibionts. Filellum serratum ( Clarke, 1879) .

World distribution. Worldwide in boreal, temperate, subtropical, and tropical parts of Atlantic, Pacific and Indian Oceans, the polyp phase penetrating into both Arctic and Antarctic regions ( Vervoort 2006). Medusa stage also recorded from the Strait of Magellan ( Pagès & Orejas 1999).

Records from Chile. Previous records are from Canal Chacao , Golfo de Ancud and Seno Reloncavi ( Leloup 1974). The present material was found roughly between 42°10' S and 50°50' S .