Abstract
Abstract Poecilosclerida is the largest and the most diverse order in the class Demospongiae and one of the least studied in the tropical Pacific Ocean. In this study, two new species and two new faunistic records of Coelosphaeridae are described from the Mexican Pacific Ocean. Celtodoryx chichiltik sp. nov. and Lissodendoryx (Anomodoryx) incrustans sp. nov. also constitute the first records of the monotypic genus Celtodoryx and the subgenus Anomodoryx from the Eastern Pacific Region. In addition, the re-description of Lissodendoryx (Waldoschmittia) hawaiiana and Lissodendoryx (Lissodendoryx) albemarlensis with new regional records are included. The cytochrome c oxidase subunit I (COI) mtDNA and 28S rDNA (C1–D2 domains) were sequenced, and molecular phylogenetic analyses of the two loci revealed that Coelosphaeridae is not monophyletic. In the 28S tree topology, neither Lissodendoryx nor Celtodoryx are monophyletic, and sequences of the two genera are members of two distinct clades containing sequences of other Poecilosclerida species. 28S sequences of L. (W.) hawaiiana show high similarities between specimens from the Mexican Pacific and a specimen from Hawaii (type locality), suggesting a wide distribution range of this sponge species in the Pacific Ocean. COI topology shows that the majority of Lissodendoryx (including our sequences) were grouped within the same molecular clade.
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