Amphinema turrida ( Mayer, 1900 )

Schuchert, Peter & Collins, Richard, 2021, Hydromedusae observed during night dives in the Gulf Stream, Revue suisse de Zoologie 128 (2), pp. 237-356 : 244

Amphinema turrida ( Mayer, 1900)

Figs 3 A-D

Dissonema turrida Mayer, 1900: 44 , pl. 2 figs 3-4. – Mayer, 1910: 116, pl. 10 fig. 1, pl. 22 fig. 1.

Stomotoca turrida . – Mayer, 1915: 199, pl. 1 fig. 1.

Amphinema turrida . ‒ Schuchert, 2007: 312, fig. 48.

Examined material: 02-JUL-2018; 1 specimen photographed; approximately 6 mm; not collected .

Observations: Amphinema medusa, approximately 6 mm high, with elongated, folded gonads that extend along 5/6 of radial canals ( Fig. 3 A-B); manubrium about half the height of the subumbrella, simple cruciform mouth with a few folds; two opposite tentacles, long, hollow, base laterally compressed and clasping bell margin, no abaxial spur, large red abaxial ocellus; about 12 rudimentary bulbs on bell margin, each with a large, red ocellus ( Fig. 3B ). Adradial and interradial rudimentary bulbs bearing a thin cirrus originating in the middle of the bulb ( Fig. 3C ).

Distribution: Florida and Bahamas; Mediterranean; Torres Strait; Papua New Guinea; Japan; Pacific Side of Mexico; Chile ( Schuchert, 2007). Type locality: USA, Florida, Dry Tortugas archipelago.

Remarks: Amphinema turrida has recently been redescribed and discussed by Schuchert (2007). Most Pacific populations lack the cirri and their status needs to be re-evaluated using genetic data.

Figures

Fig. 3. Amphinema turrida, bell height approximately 6 mm. (A) Lateral view. (B-D) Oblique views from oral side, note the presence of thin cirri.