Geryonia proboscidalis (Forsskål, 1775)

Estrada-González, Mariae C., Agüero, José & Mendoza-Becerril, María A., 2023, Medusozoans from the Mexican Pacific: a review based on historical literature and recent observations, Journal of Natural History 57 (1), pp. 784-853 : 814-815

Geryonia proboscidalis (Forsskål, 1775)

( Figure 4A )

Material examined

1, medusa, Punta Gorda , Santa Rosalía, Mulegé Municipality , Baja California Sur, 27.536°N, 112.355°W; 12 March 2015; photograph . – 1, medusa; Bay of Dreams , Baja California Sur, 23.993°N, 109.827°W; depth 0.5 m, 8 April 2019; photograph .

Identification (after Mayer 1910)

Umbrella nearly hemisphaerical, with moderately thick walls, and short velum. Peduncle conical and manubrium short. Six orange gonads extend over the subumbrella from near peduncle base to near the umbrellar margin. Six perradial orange tentacles, long and contractile. Interradial tentacles not seen.

Distribution

New record for the Gulf of California. In the MP, it has been recorded from Baja California ( Bigelow 1909), Colima, Guerrero and Michoacán ( Segura-Puertas 1984).

Remarks

The two records of G. proboscidalis come from two underwater photographs, so the microscopic details of the morphology were not observed. Nonetheless, in situ, identification is sufficient to confirm its identity since it is a monotypic species (WoRMS Editorial Board 2023).

Figures

Figure 4. A, Geryonia proboscidalis (Forsskål, 1775): medusa oral view. B, Coryne pusilla Gaertner, 1774: hydrant. C, Pennaria disticha Goldfuss, 1820: hydranth. (D, E) Eudendrium capillare Alder, 1856: D, hydranth; E, male gonophore. F, Janaria mirabilis Stechow, 1921: colony. Scale bars: B = 500 μm; C = 250 μm; D = 200 μm. Drawings made by Nicholas Bezio (A–E) and Mariae C. Estrada-González (F).