{"references": ["Calder DR. 1991. Shallow-water hydroids of Bermuda: the Thecatae, Exclusive of Plumularioidea. Royal Ontario Museum. Life Sci Contrib. 154: 1 - 140. doi: 10.2307 / 1352274", "Fraser CM. 1938 b. Hydroids of the 1936 and 1937 Allan Hancock pacific expeditions. Allan Hancock Pac Expeditions. 4 (2): 107 - 127, plates 16 - 18.", "Fraser CM. 1948. Hydroids of the Allan Hancock Pacific Expeditions since March, 1938. Allan Hancock Pac Expeditions. 4 (5): 179 - 343, plates 22 - 42.", "Mendoza-Becerril MA, Estrada-Gonzalez MC, Mazariegos-Villarreal A, Restrepo-Avendano L, Villar- Beltran RD, Aguero J, Cunha AF. 2020. Taxonomy and diversity of Hydrozoa (Cnidaria, Medusozoa) of La Paz Bay, Gulf of California. Zootaxa. 4808 (1): 1 - 37. doi: 10.11646 / zootaxa. 4808.1.1.", "Fraser CM. 1938 a. Hydroids of the 1934 Allan Hancock pacific expedition. Allan Hancock Pac Expeditions. 4 (1): 1 - 106. plates 1 - 15.", "Fraser CM. 1938 c. Hydroids of the 1932, 1933, 1935, and 1938 Allan Hancock pacific expeditions. Allan Hancock Pac Expeditions. 4 (3): 129 - 153, plates 19 - 21.", "Salcedo-Martinez S, Green G, Gamboa-Contreras A, Gomez P. 1988. Inventario de macroalgas y macroinvertebrados benticos, presentes en areas rocosas de la region de Zihuatanejo, Guerrero, Mexico. Anales Del Instituto de Ciencias Del Mar Y Limnologia. 15 (1): 73 - 95.", "Humara-Gil KJ, Cruz-Gomez C. 2018. New records of benthic hydroids (Cnidaria: Hydrozoa) from the coast of Oaxaca, Mexico. Zootaxa. 4455 (3): 454 - 470. doi: 10.11646 / zootaxa. 4455.3.3. [INEGI] Instituto Nacional de Estadistica y Geografia. 2003. Anuario Estadistico de los Estados Unidos Mexicanos. No. 61. Ley Federal del Mar. 1986. Mexico: Diario Oficial de la Federacion. Instituto Nacional de Estadistica y Geografia. [INEGI] Instituto Nacional de Estadistica y Geografia, Tapia-Varela G, Ramirez-Torres HI. Instituto de Geografia Universidad Nacional Autonoma de Mexico. 2007. Atlas de Mexico, hipsometria y batimetria. Mexico: Instituto de Geografia, Universidad Nacional Autonoma de Mexico.", "Cunha AF, Collins AG, Marques AC. 2017. Phylogenetic relationships of Proboscoida Broch, 1910 (Cnidaria, Hydrozoa): are traditional morphological diagnostic characters relevant for the delimitation of lineages at the species, genus, and family levels? Mol Phylogenet Evol. 106: 118 - 135. doi: 10.1016 / j. ympev. 2016.09.012"]}

Clytia cf. gracilis (M. Sars, 1850) (Figure 8A) Material examined 1 colony, polyp, without gonophores; Punta Diablo, La Paz Bay, Baja California Sur, 24.316° N, 110.340°W; depth 9.75 m; 14 September 2017; on barnacles; ECO-CH-Z 11758. – 1 colony, polyp, without gonophores; Punta Diablo, La Paz Bay, Baja California Sur, 24.316° N, 110.340°W; depth 9.75 m; 14 September 2017; on rock; ECO-CH-Z 11761; – 1 colony, polyp, without gonophores; Punta Los Muertos, Baja California Sur, 24.248°N, 110.150°W; depth 1–2 m; 20 July 2018; on undetermined algae; ECO-CH-Z 11771. Identification (after Calder 1991) Colonies occasionally erect but mostly stolonal; hydrocaulus monosiphonic, unbranched or irregularly branched, each branch arising from a short curved apophysis. Pedicels annulated basally and distally and smooth in the middle. Hydrothecae cone-shaped, convex above the diaphragm, nearly straight elsewhere. Hydrothecal diaphragm straight, margin with 12–14 blunt, triangular cusps, slightly tilted. Distribution Previously recorded on the west coast of the Gulf of California (Fraser 1938b, 1948; Mendoza-Becerril et al. 2020) and for the rest of the gulf in Sonora and Nayarit (Fraser 1938a, 1948). In the MP, have been recorded from Baja California Sur, Colima, Guerrero, Jalisco, and Oaxaca (Fraser 1938a, 1938b, 1938c, 1948; Salcedo-Martínez et al. 1988; Humara-Gil and Cruz-Gómez 2018). Remarks The specimens conform to the description of C. gracilis made by Calder (1991), except that the hydrotheca is short and that the cusps are not so inclined, characteristics previously described for MP specimens (Humara-Gil and Cruz-Gómez 2018; Mendoza-Becerril et al. 2020). In this work, we adopted the name C. cf. gracilis because C. gracilis currently constitutes a complex of species with high morphological variation, and detailed studies on diagnostic characters, life cycles, and molecular data for the different recognised lineages are required (Cunha et al. 2017, 2020).

Published as part of 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, pp. 784-853 in Journal of Natural History 57 (1) on page 831, DOI: 10.1080/00222933.2023.2214967, http://zenodo.org/record/8224400