The complete mitochondrial genome of sponge Halichondria sp. (Demospongiae, Suberitida, Halichondriidae) from Dok-do

Abstract

The mitogenome sequence of Halichondria sp. was determined for the first time in this study. Specimens were identified as a new species belonging to genus Halichondria and more detailed taxonomic study is ongoing. Circular complete mitogenome is 19,687 bp in length, containing 14 proteincoding genes (PCGs), 2 ribosomal RNAs (rRNAs), and 25 transfer RNAs (tRNAs). Nucleotide composition of mitogenome consists of 28.9% A, 15.1% C, 21.9% G, 34.1% T, revealing high content of A þ T similar to the other Suberitid sponges. Results will be useful for inferring phylogenetic relationships among the members of Halichondriid.

The complete mitochondrial genome of the invasive cyanobacteriosponge Terpios hoshinota (Demospongiae, Suberitida, Suberitidae)

“… 2019 ), and the nucleotide composition had high content of A + T (63.5%) similar to other Suberitid sponges (Kim et al. 2019 ).…”

“… 2007 ) but identical to that of Halichondria (Kim et al. 2017 , 2019 ). The difference is accounted for by repeats of trnM, trnR and trnS in T. hoshinota .…”

“… 2019 ; Kim et al. 2019 ). The length of these Heteroscleromorphan mitogenomes is 2,000–3,000 base pairs longer than those of Hexasterophoran sponges (see Aphrocallistes vastus , Rosengarten et al.…”

A Review on Genus Halichondria (Demospongiae, Porifera)

“…Moreover, an extensive overlap of spicule sizes in different species has been documented [2]. Molecular data used in phylogenetic studies includes complete mitochondrial genomes of several Halichondria species [45][46][47] and mitochondrial and ribosomal markers [48,49]. The classification of genus Halichondria, as defined in [2], is still in need of a major revision at an ordinal level [35,50], as classification based on morphology disagrees with phylogenetic analyses using molecular data.…”