Yucatania clavus a new genus and new species for the family Thrombidae is reported from the continental shelf off the Yucatan Peninsula, Mexico. It is the second genus of the family, which is characterized by the presence of a new skeletal character, based on reduced triaenes, which are here termed “demotriaenes,” and constituting the main megasclere spicule. These are arranged in a radial palisade pattern at the periphery with a confused architecture in the choanosome. In addition, Yucatania has the typical skeletal megascleres of the family, i.e., the small acanthotriaene, in addition to the amphiaster type. These characteristics are established to include the type species: Y. clavus. Thrombus, the sole genus of the family up to now, is distinct from Yucatania by possessing a single spicule type, i.e., the small acanthotriaenes. These are arranged with the cladomes tangential to the surface, without reaching a radial or a palisade structure, and only two of the five members of it bear the amphiaster type. A redescription of the family Thrombidae is here included.
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Vol. 119 • No. 3