The mitochondrial genome of Faughnia haani (Stomatopoda): novel organization of the control region and phylogenetic position of the superfamily Parasquilloidea

BMC Genomics

Juan Antonio Baeza¹  Jongwoo Jung²  Hee-seung Hwang³ 

[1] Department of Biological Sciences, 132 Long Hall, Clemson University, 29634, Clemson, SC, USA;Smithsonian Marine Station at Fort Pierce, 701 Seaway Drive, Fort Pierce, 34949, Florida, USA;Departamento de Biología Marina, Facultad de Ciencias del Mar, Universidad Católica del Norte, Larrondo, 1281, Coquimbo, Chile;Division of EcoCreative, Ewha Womans University, 03760, Seoul, Republic of Korea;Department of Science Education, Ewha Womans University, 03760, Seoul, Republic of Korea;Research Institute of EcoScience, Ewha Womans University, 03760, Seoul, Republic of Korea;

关键词: Control region organization;    Raptorial claw;    Mitochondrial genome;    Parasquilloidea;    Stomatopoda;    Vision;   

DOI  :  10.1186/s12864-021-08034-x

来源: Springer

【 摘 要 】

BackgroundStomatopod crustaceans are aggressive marine predators featuring complex compound eyes and powerful raptorial appendages used for “smashing” or “spearing” prey and/or competitors. Among them, parasquilloids (superfamily Parasquilloidea) possess eyes with 2-3 midband rows of hexagonal ommatidia and spearing appendages. Here, we assembled and analyzed the complete mitochondrial genome of the parasquilloid Faughnia haani and explored family- and superfamily-level phylogenetic relationships within the Stomatopoda based on mitochondrial protein coding genes (PCGs).ResultsThe mitochondrial genome of F. haani is 16,089 bp in length and encodes 13 protein coding genes (PCGs), 22 transfer RNA genes, 2 ribosomal RNA genes, and a control region that is relatively well organized, containing 2 GA-blocks, 4 poly-T stretches, various [TA(A)]n-blocks, and 2 hairpin structures. This organized control region is likely a synapomorphic characteristic in the Stomatopoda. Comparison of the control region among superfamilies shows that parasquilloid species are more similar to gonodactyloids than to squilloids and lysiosquilloids given the presence of various  poly-T stretches between the hairpin structures and [TA(A)]n-blocks. Synteny is identical to that reported for other stomatopods and corresponds to the Pancrustacea ground pattern. A maximum-likelihood phylogenetic tree based on PCGs revealed that Parasquilloidea is sister to Lysiosquilloidea and Gonodactyloidea and not to Squilloidea, contradicting previous phylogenetic studies.ConclusionsThe novel phylogenetic position of Parasquilloidea revealed by our study indicates that ‘spearing’ raptorial appendages are plesiomorphic and that the ‘smashing’ type is either derived (as reported in previous studies) or apomorphic. Our results raise the possibility that the spearing raptorial claw may have independently evolved twice. The superfamily Parasquilloidea exhibits a closer relationship with other stomatopod superfamilies with a different raptorial claw type and with dissimilar numbers of midband rows of hexagonal ommatidia. Additional studies focusing on the assembly of mitochondrial genomes from species belonging to different genera, families, and superfamilies within the order Stomatopoda are warranted to reach a robust conclusion regarding the evolutionary history of this iconic clade based on mitochondrial PCGs.

【 授权许可】

CC BY