Carybdea xaymacana Conant, 1897 Figs. 4A–I Collected samples: MH _2_1, Mahahual, Quintana Roo, Mexico, 18°43’22”N, 87°42’00”W; 9 m; December 1990; 27°C; 36 PSU; 1 adult specimen, BH= 2.4 cm, IPD= 2.2 cm. PM _A_1, Puerto Morelos, Quintana Roo, Mexico, 20°52’0.00’’N, 86°51’0.00’’W; December 2001; 3 juvenile specimens, BH=0.5/0.4/ 0.5 cm, IPD=0.3/0.4/ 0.4 cm. BEL_77_1, Northeast Caye Raguana, Belize, 16°22’31.3”N, 88°01’55.0”W; 0–100 m; January 2007; 1 juvenil specimen, BH= 1.6 cm, IPD= 1.8 cm. PM _1,2, Puerto Morelos, Quintana Roo, Mexico, 20°52’05.3”N, 86°52’00.9”W; 1 m; November 2023; 28.8°C; 36.5 PSU; 8 adult specimens, BH=2.9/2.3/2.4/2.6/2.3/2.3/3.0/ 2.5 cm; IPD=2.7/2.3/ 2.5/2.5/2.4/2.4/3/ 2.4 cm. Zooplankton collection: ECO-CH-Z-02242, Bahía de la Ascension, Quintana Roo, Mexico, 19°47’01.0”N, 87°26’07.9”W; 5.8 m; June 1997; 30°C; 35 PSU; 1 juvenil specimen, BH= 0.1 cm; IPD= 0.1cm; as Carybdea marsupialis. Citizen science (iNaturalist): Quintana Roo, Mexico, 20°16’41.9”N, 87°22’50.9”W; June 2018; Obs. Donají Graham. Nematocysts: thin bands along the length of the tentacles, undischarged, euryteles 37–39 μm ± 0.8 x 13–14 μm ± 0.4 and warts scattered exumbrella, undischarged, spherical isorhizas 10–11 μm ± 0.5 x 10–11 μm ± 0.5. DNA Sequence with accession numbers MEDUS187–25 had a greater than 90% identity with JN700978.1 Genbank number access (C. xaymacana).

Published as part of Villalobos-León, Raquel Inés & Mendoza-Becerril, María A., 2025, Cubozoans (Cnidaria, Cubozoa) in the western Caribbean Sea: new and additional records of Carybdea xaymacana, Alatina alata, and Tamoya cf. haplonema, pp. 29-40 in Zootaxa 5609 (1) on pages 32-34, DOI: 10.11646/zootaxa.5609.1.2, http://zenodo.org/record/15214650