A New Species of Semicytherura (Crustacea: Ostracoda: Cytheroidea) from Obitsu River Estuary (Central Japan) and Its Microhabitat
Yuriko Nakao, Akira Tsukagoshi
2020 Volume 25 Number 1 Pages 1-9

Two New Species of Composetia (Annelida: Nereididae) from Small Estuaries in the Ryukyu Islands, Southern Japan, with a List of All Species Currently Belonging to Composetia
Masanori Sato
2020 Volume 25 Number 1 Pages 11-24

Distributions and Variations of Two Estuarine Species of Composetia (Annelida: Nereididae) in the Ryukyu Islands, Southern Japan, with a New Record of Composetia tokashikiensis from Thailand
Masanori Sato, Takumi Ebihara, Kiyoshi Satake, Shigeaki Kojima, Hiroaki Fukumori, Saowapa Angsupanich
2020 Volume 25 Number 1 Pages 25-38

First Japanese Record of the Fivebar Grouper Epinephelus kupangensis (Perciformes: Serranidae)
Yuta Inoue, Hiromitsu Endo, Hiroyuki Motomura, Mizuki Matsunuma
2020 Volume 25 Number 1 Pages 39-47

Revised Diagnosis of the Rare Clingfish Kopua nuimata (Gobiesocidae) with Notes on Fresh Coloration and First Australian Record
Kyoji Fujiwara, Hiroyuki Motomura
2020 Volume 25 Number 1 Pages 49-54

First Record of the Lizardfish Synodus mundyi (Actinopterygii: Aulopiformes: Synodontidae) from Japan
Naohide Nakayama, Takaaki Tamai
2020 Volume 25 Number 1 Pages 55-60

Alien Gill Parasites of the Silver Carp Hypophthalmichthys molitrix (Cypriniformes: Cyprinidae) in Tochigi Prefecture, Central Japan
Masato Nitta, Kazuya Nagasawa
2020 Volume 25 Number 1 Pages 61-73

Three New Species of Dendrogaster (Crustacea: Ascothoracida) Infecting Goniasterid Sea-Stars (Echinodermata: Asteroidea) from Japan
Nobuhiro Saito, Kaori Wakabayashi, Takeya Moritaki
2020 Volume 25 Number 1 Pages 75-87

Upgrading of Three Subspecies of Eudigraphis takakuwai to the Species Rank (Diplopoda: Penicillata: Polyxenida: Polyxenidae)
Shigenori Karasawa, Keisuke Kawano, Shin-ichi Fukaya, Nobuo Tsurusaki
2020 Volume 25 Number 1 Pages 89-102

Description of a Pelagic Juvenile of the Poorly Known Anglerfish Sladenia zhui (Lophiidae) from the East China Sea  
Mizuki Matsunuma, Nozomu Muto
2020 Volume 25 Number 2 Pages 107-116

A New Species of Rhabdias (Nematoda: Rhabditida: Rhabdiasidae) from Miyakojima Island, Okinawa, Japan

Naoya Sata, Hirohiko Takeuchi, Takafumi Nakano

2020 Volume 25 Number 2 Pages 117-121

Redescription of the specimen of Thrissina dussumieri (Teleostei: Clupeiformes: Engraulidae), collected from the Ogasawara Islands

Harutaka Hata

2020 Volume 25 Number 2 Pages 123-127

The Bluespotted Hind Cephalopholis cyanostigma (Perciformes: Serranidae) from the Southern Ryukyu Islands: First Specimen-based Records from Japan

Jumpei Nakamura, You Sakurai, Tetsuo Yoshino, Hiroyuki Motomura

2020 Volume 25 Number 2 Pages 129-133

First Specimen-based Records of Canthidermis macrolepis (Tetraodontiformes: Balistidae) from the Pacific Ocean and Comparisons with C. maculata

Mizuki Matsunuma, Shinichirou Ikeguchi, Yoshiaki Kai

2020 Volume 25 Number 2 Pages 135-144

Description of a New Species of Cybaeus (Araneae: Cybaeidae) from Central Honshu, Japan

Kenji Matsuda, Yoh Ihara, Takafumi Nakano

2020 Volume 25 Number 2 Pages 145-152

Elpidia soyoae, a New Species of Deep-sea Holothurian (Echinodermata) from the Japan Trench Area

Akito Ogawa, Takami Morita, Toshihiko Fujita

2020 Volume 25 Number 2 Pages 153-162

First Records of the Pughead-pipefish Bulbonaricus davaoensis (Teleostei: Syngnathidae) from Japan

Moeri Araki, Kazutoshi Uehara, Hiroshi Senou, Hiroyuki Motomura

2020 Volume 25 Number 2 Pages 163-169

Description of a New Species of Rhabdias (Nematoda: Rhabditida: Rhabdiasidae) from Ishigakijima Island, Okinawa, Japan

Naoya Sata, Hirohiko Takeuchi, Takafumi Nakano

2020 Volume 25 Number 2 Pages 171-175

First Records of Uropterygius oligospondylus (Anguilliformes: Muraenidae) from Minami-iwo-to Island, Southern Japan

Yusuke Hibino, Kaoru Kuriiwa, Tetsuya Yamada, Kiyotaka Hatooka, Kar Hoe Loh, Tetsuro Sasaki

2020 Volume 25 Number 2 Pages 177-182

A New Species of Bathyal Nemertean, Proamphiporus kaimeiae sp. nov., off Tohoku, Japan, and Molecular Systematics of the Genus (Nemertea: Monostilifera)

Natsumi Hookabe, Shinji Tsuchida, Yoshihiro Fujiwara, Hiroshi Kajihara

2020 Volume 25 Number 2 Pages 183-188

A New Species of Zygantroides (Platyhelminthes: Polycladida) from Amakusa, Japan

Yuki Oya, Aoi Tsuyuki, Hiroshi Kajihara

2020 Volume 25 Number 2 Pages 189-196

Salmincola edwardsii (Copepoda: Lernaeopodidae) Parasitic on Southern Asian Dolly Varden, Salvelinus malma krascheninnikova, from Hokkaido Island, Japan, with the Southernmost Distribution Record of the Copepod in Asia

Kazuya Nagasawa

2020 Volume 25 Number 2 Pages 197-203

A New Species of Free-living Marine Nematode, Proplatycoma tsukubae sp. nov. (Enoplida: Leptosomatidae), from Japan

Daisuke Shimada, Keiichi Kakui

2020 Volume 25 Number 2 Pages 205-211

Meiobenthic Polychaete Dinophilus sp. cf. gyrociliatus (Annelida: Dinophilidae) from Japan with SEM Observation and DNA Barcodes

Naoto Jimi, Takuya Minokawa, Toru Miura, Hiroshi Kajihara

2020 Volume 25 Number 2 Pages 213-218

Monoporella projecta (Cheilostomata: Bryozoa), a New Uniserial Species from the Continental Shelf and Slope of Japan

Shinji Arakawa

2020 Volume 25 Number 2 Pages 219-225

A New Species of Massinium (Echinodermata: Holothuroidea: Dendrochirotida: Phyllophoridae: Semperiellinae) from Western Japan

Yusuke Yamana, Yuzo Ota, Hisanori Kohtsuka, Kazumi Yoshizaki

2020 Volume 25 Number 2 Pages 227-236

A New Kelp Crab Species of the Genus Pugettia (Crustacea: Decapoda: Brachyura: Epialtidae) from Shandong Peninsula, Northeast China

Naoya Ohtsuchi, Hironori Komatsu, Xinzheng Li

2020 Volume 25 Number 2 Pages 237-250

Three Species of Ribbon Worms (Nemertea) from Cebu, the Philippines

Hiroshi Kajihara

2020 Volume 25 Number 2 Pages 251-273

New Distributional Records of Three Species of Euphylliidae (Cnidaria, Anthozoa, Hexacorallia, Scleractinia) from the Ryukyu Islands, Japan

Takuma Fujii, Yuko F Kitano, Hiroyuki Tachikawa

2020 Volume 25 Number 2 Pages 275-282

A New Record of Brittle Star Ophiopsila cf. polyacantha (Echinodermata: Ophiuroidea) from Southwestern Japan, with Notes on its Bioluminescence

Masanori Okanishi, Takuma Fujii

2020 Volume 25 Number 2 Pages 283-294

New Records of Species of Gebiidea and Anomura (Crustacea: Decapoda) from the Sea of Japan

Masayuki Osawa, Yuzo Ota

2020 Volume 25 Number 2 Pages 295-307

Shallow-water Comatulids (Echinodermata: Crinoidea: Comatulida) of the Ashizuri-Uwakai Sea, Shikoku Island, Southern Japan

Masami Obuchi

2020 Volume 25 Number 2 Pages 309-328

Lamispina miurai sp. nov. (Annelida: Flabelligeridae) from off Aomori, Japan

Yuki Higashida, Naoto Jimi, Hiroshi Kajihara

2020 Volume 25 Number 2 Pages 329-342

First Record of the Rare Parasitic Isopod Elthusa splendida (Cymothoidae) from the Pacific Ocean, Based on a Specimen Found in a Museum Shark Collection

Ryota Kawanishi, Shinpei Ohashi

2020 Volume 25 Number 2 Pages 343-348

Redescription of Dactylogyrus petruschewskyi Gussev, 1955 (Monogenea: Dactylogyridae), a Newly Recorded Alien Monogenean from an Alien Cyprinid, Megalobrama amblycephala Yih, 1955 (Cypriniformes: Cyprinidae), in Ibaraki Prefecture, Central Japan

Masato Nitta, Takanori Ishikawa, Tomiji Hagiwara

2020 Volume 25 Number 2 Pages 349-354

Acentrogobius limarius (Gobiidae) from the Ryukyu Islands, Japan: First Northern Hemisphere Records

Kyoji Fujiwara, Kiyoshi Hagiwara, Toshiyuki Suzuki, Hiroyuki Motomura

2020 Volume 25 Number 2 Pages 355-359

Reflections on the Nature, Framing, and Testing of Historical Biogeographic Hypotheses

Ronald Sluys

2020 Volume 25 Number 2 Pages 361-367

Salmincola markewitschi (Copepoda: Lernaeopodidae) Parasitic on Whitespotted Char, Salvelinus leucomaenis, in a Mountain Stream of Honshu Island, Central Japan

Kazuya Nagasawa

2020 Volume 25 Number 2 Pages 369-375

First Record of Platyberyx rhyton (Teleostei: Perciformes: Caristiidae) Outside of Japanese Waters and Description of Juvenile Morphology

Benjamin W. Frable, Duane E. Stevenson

2020 Volume 25 Number 2 Pages 377-380