A new species of tubeworm belonging to the genus Hyalopomatus (Serpulidae) is described from the southern Mexican Pacific. It was found in 2024 attached to a seismograph at nearly 1000 m depth. The new species possesses distinctive features that separate it from the 17 species of this genus currently recognized, including: a white, opaque, smooth tube, with anterior collar-like shallow rings; a tetra-lobed collar; thoracic membranes extending to the second chaetiger; absence of an anterior abdominal achaetous zone; a spherical operculum, with a slightly differentiated distal cap; and a smooth, not annulated, junction between the peduncle and the operculum. Phylogenetic analyses indicate that the new species forms a clade with some other Hyalopomatus species (H. mironovi, H. suelindsayae and H. sp. 1 Jaco Summit) but does not group with an undescribed species from the Gulf of California (H. sp. Guaymas Basin).
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