A Review of the Pennatulacean Genus Stylatula, with the Description of a New Species from Japan (Cnidaria: Octocorallia) Author Williams, Gary C. Department of Invertebrate Zoology and Geology, California Academy of Sciences, 55 Music Concourse Drive, San Francisco, California 94118, USA. Corresponding author: Email: gwilliams @ calacademy. org.; Author Matsumoto, Asako K. Planetary Exploration Research Center (PERC), Chiba Institute of Technology (Chitec), Tsudanuma 2 - 17 - 1, Narashino, Chiba 275 - 0016, Japan; & Faculty of Economics and Informatics, Educational Foundation SHOUHEIKOU, Higashi Nippon International University, 37 Suganezawa, Kamata, Taira, Iwaki, Fukushima 970 - 8023, Japan text Proceedings of the California Academy of Sciences 2015 2015-04-15 62 8 257 266 journal article 299712 10.5281/zenodo.11512380 cbd0259b-b622-45d4-88a9-ed702008c386 0068-547X 11512380 Key to the Pacific Ocean Species of Stylatula 1a. Sclerites of the polyp leaf fans are not three-flanged. Polyps per polyp leaf 4–6........................................................................ S. austropacifica 1b. Sclerites of the polyp leaf fans are conspicuously three-flanged....................... 2 2a. Mature colonies < 65 mm in length. Polyps per polyp leaf 2–4. Large needle-like sclerites of the polyp leaf fans less than 7........................................ S. diminutiva 2b. Mature colonies> 65 mm in length. Polyps per polyp leaf more than 5. Large needle-like sclerites of the polyp leaf fans 9–12............................................... 3 3a. Number of polyps per polyp leaf up to 18................................. S. gracilis 3b. Number of polyps per polyp leaf up to 24................................ S. elongata