Diversity in invertebrates
Department of Biological Sciences, Biodiversity
Taxonomy and biology of marine invertebrates, especially the crustacean order Tanaidacea
|Field||Systematic zoology, Reproductive biology, Morphology, Zoology|
|Keyword||Marine invertebrates, Arthropoda, Crustacea, Tanaidacea, Benthos, Taxonomy, New species, Molecular phylogeny, Reproduction, Sexual mode, Morphology, Life cycle, Evolution|
Introduction of Research
I am interested in the taxonomy, phylogeny, reproductive biology, morphology, and evolution of invertebrate animals. The main focus of my research is the order Tanaidacea, a group of tiny aquatic crustaceans, with around 1400 species. However, past or ongoing collaborative projects in taxonomy and phylogeny have dealt with animal groups other than tanaidaceans, including isopods, amphipods, decapod, ostracods, copepods, mite, sea spider, nematodes, entoproct, nemertean, feather star, and xenoturbelid.
Various tanaidaceans A parasitic copepod (arrow) on a tanaidacean A tanaidacean which can self-fertilize A deep-sea tanaidacean with a wide distributional range spanning at least 3700 km (cf. Kakui et al. 2020) A tanaidacean described by my student, one collaborator, and me (cf. Okamoto et al. 2020); it spins threads to make its tube-like nest (cf. Kakui et al. 2021). A hermit-crab-like tanaidacean (cf. Kakui 2019)
Kakui K, Hiruta C (2022) Description of a new Hamatipeda species, with an 18S molecular phylogeny (Crustacea: Tanaidacea: Typhlotanaidae). Zoological Science 39: 140–146.
Kakui K, Fleming JF, Mori M, Fujiwara Y, Arakawa K (2021) Comprehensive transcriptome sequencing of Tanaidacea with proteomic evidences for their silk. Genome Biology and Evolution 13: evab281.
Kakui K, Nomaki H, Komatsu H, Fujiwara Y (2020) Unexpected low genetic differentiation between Japan and Bering Sea populations of a deep-sea benthic crustacean lacking a planktonic larval stage (Peracarida: Tanaidacea). Biological Journal of the Linnean Society 131: 566–574.
Okamoto N, Oya Y, Kakui K (2020) A new species of Zeuxo (Crustacea: Peracarida: Tanaidacea) from Japan, with remarks on carapace pigmentation as a potentially useful taxonomic character. Marine Biology Research 16: 411–422.
Kakui K (2019) Shell-exchange behavior in a hermit-crab-like tanaidacean (Crustacea: Malacostraca). Zoological Science 36: 468–470.