Kyushu University Academic Staff Educational and Research Activities Database
List of Presentations
TACHI Takuji Last modified date:2023.11.22

Associate Professor / Biosystematics Laboratory / Department of Environmental Changes / Faculty of Social and Cultural Studies

1. Takuji Tachi, Yu-Zen Huang & Hiroshi Shima, Comparative morphology of piercing-type female ovipositor of the tribe Blondeliini (Diptera: Tachinidae) with its phylogenetic implications, International Congresses of Dipterology, 2018.11, A piercing-type ovipositor of the female postabdomen occurs in some genera of Blondellini (e.g., Blondelia Robineau-Desvoidy, Celatoria Coquillett and Medinodexia Townsend). Wood (1985, Mem. Ent. Soc. Can. 132: 1-130) used this feature in the couplet of the generic key to the Blondeliini to include the following genera: Blondelia, Celatoria, Compsilura Bouché, Eucelatoria Townsend, Proroglutea Townsend, and Vibrissina Rondani. The piercer is a modification of the female abdominal sternite 7 (Herting 1956, Z. Morph. Ökol. Tiere 45: 429-461). Molecular data indicated that the piercing ovipositor evolved independently in Blondelia-group (sense Tschorsnig 1985, Stuttg. Beitr. Naturk. A. 383: 1-137) and Medinodexia (Tachi & Shima 2010, Syst. Ent. 35: 148-163). In this study we examine the morphological features of the piercing ovipositor of Blondeliini, particularly an invagination of the abdominal segment. We discuss the phylogenetic implications in Blondeliini phylogeny. .
2. Huang Yu-Zen, 舘 卓司, Four newly recorded genera of tribe Blondeliini (Diptera: Tachinidae) in Taiwan, 日本昆虫学会, 2016.03.
3. TACHI Takuji, SHIMA Hiroshi, A revised evolutionary history of female reproductive (oviposition) strategy in the subfamily Exoristinae (Calyptratae, Tachinidae), 8th International Congress of Dipterology, 2014.08, The Tachinidae are parasitoids of insects and other arthropods and are one of the largest families of Diptera. Several reproductive strategies beyond the typical direct oviparity have been adopted by tachinids to parasitize their hosts. The Exoristinae, one of the four subfamilies of Tachinidae, have diverse morphological characters and female reproductive habits. In particular, oviparity, ovolarviparity and micro-ovolarviparity are known in this subfamily. We inferred the phylogenetic relationships among genera and tribes of Exoristinae using 4 genes (white, 18S, 28S and 16S rDNA), and evaluated the transformation of female oviposition strategy of the Exoristinae on the resulting phylogeny (Tachi & Shima, 2010). However, the evolutionary history of the micro-ovolarviparity was not well-resolved due to the unclear relationships of the Eryciini.
Here, we revise our understanding of the phylogenetic relationships within Exoristinae by adding taxa and genes to the previous dataset. In particular, the placement of the oviparous genus Aplomya Robineau-Desvoidy was examined. The transformation of the female reproductive system of the Exoristinae was re-analyzed based on the generated tree. It indicates as follows: 1) oviparity is the primitive state. 2) ovolarviparity has independently evolved in multiple clades. 3) The Goniini are monophyletic and their female reproductive system (micro-ovolarviparity) originated from one of the ovolarviparous clades. However, we also provide evidence that micro-ovolarviparity may have evolved multiple times.