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The genomic DNA of twoProvannasp. individuals was extracted, sequenced using an Illumina HiSeq1500, and the mitogenome was assembled. The nearly complete metogenome was 16,183 bp in length, consisting of 37 typical metazoan mitochondrial genes with the typical caenogastropod mitochondrial gene order. All mitochondrial genes were encoded on the heavy strand with the exception of eight transfer RNA genes. To reconstruct the phylogenetic position of the deep-sea Provannidae, we used amino acid sequences of all the 13 mitochondrial protein-coding genes in Bayesian inference, maximum likelihood, and maximum parsimony analyses with sequences of selected gastropods. The resultant phylogenetic trees supported the placement of Provannidae in the superfamily Abyssochrysoidea of the clade Littorinimorpha of Gastropoda, providing new data for understanding the phylogeny of these deep-sea snails. [ABSTRACT FROM AUTHOR]

We reported a nearly complete mitochondrial genome (mitogenome) from the glass spongeLophophysema eversa, the second mitogenome in the order Amphidiscosida and the ninth in the class Hexactinellida. It is 20,651 base pairs in length and contains 39 genes including 13 protein-coding genes, 2 ribosomal RNA subunit genes and 24 tRNA genes. The gene content and order ofL. eversaare identical to those ofTabachnickiasp., the other species with a sequenced mitogenome in Amphidiscosida, except with two additional tRNAs and three tRNA translocations. Thecobgene has a +1 translational frameshift. These results will contribute to a better understanding of the phylogeny of glass sponges. [ABSTRACT FROM AUTHOR]