Stomolophus sp. 2, 1860

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 : 811-812

Stomolophus sp. 2

( Figure 3F, G )

Material examined

2, medusae, mature; Punta Prieta, La Paz Bay , Baja California Sur, 24.230°N, 110.313°W; depth 0–1 m, 8 June 2017; ECO-CH-Z 11779 . – 2, medusae, immature; El Comitán Beach, La Paz Bay , Baja California Sur, 24.128°N, 110.418°W; depth 0–1 m, 13 April 2021; ECO-CH-Z 11780 . – 2, medusae, gonads not seen; La Paz Boardwalk, La Paz Bay , Baja California Sur, 24.156°N, 110.322°W; water surface, 4 April 2021; photograph . – 1, medusa, gonads not seen; Camahuiroa Beach, Huatabampo , Sonora, 26.537°N, 109.287°W; depth 0–1 m, 5 April 2021; photograph .

Identification (after Mayer 1910)

Umbrella hemispherical, mesogloea thick, umbrellar margin with lappets. Eight rhopalia. A central stomach connects to mouth openings via the oesophagus into a well-developed manubrium formed by the fusion of eight oral arms with distal end free. Four invaginated gonads. Sixteen radial canals connecting with stomach and marginal network of anastomosing canals without a circular canal.

Distribution

The genus Stomolophus has been previously recorded on the west coast of the Gulf of California, Baja California, and Baja California Sur, under the names of Stomolophus meleagris Agassiz, 1862 ( Reza et al. 2018; González-Valdovinos et al. 2019), Stomolophus sp. ( Getino-Mamet et al. 2017), Stomolophus sp. 1 and Stomolophus sp. 2 ( Gómez Daglio and Dawson 2017; Getino-Mamet et al. 2019). For the rest of the gulf in Nayarit, Sinaloa, and Sonora, records exist as S. meleagris ( Gómez-Aguirre 1991; Carvalho-Saucedo et al. 2011, 2012; Padilla-Serrato et al. 2013; Álvarez-Tello et al. 2015, 2016), Stomolophus sp. ( Getino-Mamet et al. 2017), Stomolophus sp. 1 , Stomolophus sp. 2 , and Stomolophus sp. 6 ( Gómez Daglio and Dawson 2017; Getino-Mamet et al. 2019). For the MP, it has been recorded on the coasts of Baja California Sur, Chiapas, Guerrero, and Oaxaca under S. meleagris ( Ocaña-Luna and Gómez-Aguirre 1999; López Serrano and Serrano Guzmán 2013; Álvarez-Silva et al. 2006; Moral-Flores et al. 2020), Stomolophus cf. meleagris ( Del Moral-Flores et al. 2020) , and Stomolophus sp. 2 ( Gómez Daglio and Dawson 2017; Getino-Mamet et al. 2019).

Remarks

The inclusion of molecular data distinguishes Stomolophus sp. 1 and Stomolophus sp. 2 as different lineages in the Gulf of California ( Gómez Daglio and Dawson 2017; Getino-Mamet et al. 2019). Therefore, morphological and taxonomic descriptions for both species are needed.

Figures

Figure 3. (A, B) Linuche sp.: A, Stephanoscyphistoma exoskeleton; B, aboral view. (C–E) Lobonemidae sp. indet.: C, umbrella; D, oral arms; E, umbrellar margin with rhopalium (square). (F, G) Stomolophus sp. 2: F, umbrella; G, oral arms. H, Phacellophora sp.: medusa. Scale bars: A, B=–500 μm. Photographs were taken by Oscar Peña (F) and Javier González (Sociedad Cooperativa Abuloneros y Langostero) (H).