著者

Hayato Tanaka Susumu Ohtsuka

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.24, no.2, pp.217-228, 2019-10-25 (Released:2019-10-25)

参考文献数

35

被引用文献数

1

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In the present study, we describe two new marine species, Microloxoconcha toyoshioae n. sp. and M. sublittoralis n. sp., collected from the sandy bottom in the western part of Japan, from the depths of approximately 20 to 30 m and 50 m, respectively. This represents the first record of this genus from such depths, since all 10 previously described species are known from the beach interstitial waters. We suspect the two new species are most probably also inhabiting spaces between sand grains since they have very small body and have been collected with other common interstitial ostracods belonging to Cobanocythere Hartmann, 1959; Parvocythere Hartmann, 1959; Paracobanocythere Gottwald, 1983; Parapolycope Klie, 1936; and Psammocythere Klie, 1936. Owing to their small body and fragile carapace, previous studies might have overlooked the existence of interstitial ostracods from habitats other than beach interstitial. In addition, a key to all species of the genus Microloxoconcha is provided.

著者

Masanori Nonaka Nozomi Hanahara Keiichi Kakui

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.28, no.2, pp.231-243, 2023-11-09 (Released:2023-11-09)

参考文献数

28

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A new species of Hemicorallium Gray, 1867 (Coralliidae), Hemicorallium meraboshi sp. nov., is described here. The specimen was found at a depth of 1744–1755 m, approximately 340 km east of the Honshu (mainland Japan) coast. The colony was identified by visual and microscopic observation of standard morphological characteristics (colony size, diameters of colony base and branches, diameter and height of autozooid mound, thickness of coenenchyme, sclerite sizes, etc.) along with support from molecular evidence. The unique features of this specimen are the large (more than 2 mm in diameter) autozooid mounds and the sizable sclerites in the coenenchyme (over 0.1 mm long) that are 8-radiates and multi-radiates predominantly. This new species is the northernmost record of Pacific precious corals.

著者

Kazuya Nagasawa

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.28, no.2, pp.217-223, 2023-10-26 (Released:2023-10-26)

参考文献数

45

被引用文献数

2

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Argulus japonicus Thiele, 1900 and Argulus coregoni Thorell, 1864 are ectoparasites of freshwater fishes and are known to occur in Lake Biwa and its adjacent inland waters in Shiga Prefecture, central Japan. Since these parasites are not common in the wild in Japan, this study examined the specimens loaned from the Lake Biwa Museum and those previously reported from this prefecture in order to clarify their distributional patterns. The specimens of A. japonicus were obtained in Lake Biwa and a nearby pond, whereas those of A. coregoni were almost exclusively collected in the large rivers flowing into the lake and most of them were from mountain streams which are higher-elevated than the lake or pond. These results indicate both A. japonicus and A. coregoni has its own habitat preference dependent on different environmental conditions: A. japonicus inhabits the still or slow-flowing waters, but A. coregoni occurs in the running waters, especially in the colder, well oxygenated mountain streams.

著者

Hiroyuki Ariyama Keisuke Mori

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.28, no.1, pp.31-44, 2023-01-26 (Released:2023-01-26)

参考文献数

30

被引用文献数

1

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Two distinctive species of Amphipoda are described from the Ariake Sea in Japan. Scutischyrocerus japonicus sp. nov. (Family Ischyroceridae) is characterized by the cylindrical shape and the shield-like coxae 2–5. This new species differs from S. scutatus Myers, 1995 in the uropods with peduncles bearing many plumose setae. In the second species, Ledoyerella clavata (Hirayama, 1984) comb. nov. (Family Kamakidae), the lateral cephalic lobe is strongly produced, and the gnathopods 1, 2 of both sexes are the same size, with the propodus being almost as long as the carpus. This species can be distinguished from its congeners by the heavily setose posterior margins of pereopods 6, 7 bases. Ledoyerella spinosa Ren, 2006 is synonymized with this species.

著者

Robin James Smith Hirokazu Ozawa Aoi Mizukami Shizuko Nakai

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.28, no.1, pp.5-13, 2023-01-01 (Released:2023-01-01)

参考文献数

41

被引用文献数

2

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Sampling of rice fields in Kanagawa Prefecture, Japan, yielded an undescribed species of the non-marine ostracod genus Sarscypridopsis McKenzie, 1977. Small marginal denticles on the left valve give this species its name: Sarscypridopsis denticulata n. sp. Most species of the genus Sarscypridopsis are restricted to Africa, and based on morphological characters, the closest congener of this new species is native to Botswana. We therefore conclude that this species is probably not native to Japan, and it joins six other non-marine ostracod species that are probably or possibly alien or invasive in Japan. Including the new species, four of these are associated with rice fields. All specimens of Sarscypridopsis denticulata n. sp. are female, and one of the antennal claws (claw G2) is more robust and with better developed serration compared with the other antennal claws. This is a feature of several Cypridopsinae lineages, but in females only. An overview of the zoogeographical distribution of the genus is provided.

著者

Taro Jonishi Takafumi Nakano

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.27, no.1, pp.71-81, 2022-03-25 (Released:2022-03-25)

参考文献数

89

被引用文献数

1

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The authorships of 14 species-group names of chilopods introduced by Yoshioki Takakuwa in 1934 are clarified. Four names, viz., Dicellophilus latifrons Takakuwa, 1934, Tygarrup moiwaensis Takakuwa, 1934, Prolamnonyx obtusus Takakuwa, 1934, and P. dentatus Takakuwa, 1934 should be attributed to Takakuwa’s work published in Japanese in April 1934 in Volume 2, Issue No. 4 of the journal Shokubutsu oyobi Dobutsu (=Botany and Zoology). The specific names of two other Mecistocephalus species, viz., M. ongi Takakuwa, 1934 and M. brevisternalis Takakuwa, 1934, should be attributed to the Takakuwa’s work published in German in April 1934, in Volume 14, Issue No. 3 of the journal Annotationes Zoologicae Japonenses. The correct attributions of six more names, viz., Geophilus monoporus Takakuwa, 1934, Nesogeophilus kozuensis Takakuwa, 1934, N. tiosianus Takakuwa, 1934, N. littoralis Takakuwa, 1934, Thalthybius tenuicollis Takakuwa, 1934, and Cryptops japonicus Takakuwa, 1934, is to Takakuwa’s work published in Japanese in September 1934, in Volume 46, Issue No. 551 of the journal Dobutsugaku Zasshi. In addition to the 14 species-group names, the correct attribution of Mecistocephalus takakuwai, which has traditionally been attributed to the work by Karl W. Verhoeff published in November 1934, is clarified. This species was described by Takakuwa in the work published in April 1934, but nonetheless, it is concluded that its correct attribution is to Takakuwa’s work published in Japanese in October 1932 in Volume 30, Issue No. 47 of the journal Hakubutsugaku Zasshi. Synonymies showing earlier authors’ attributions are given for each of these species, and, when possible, the composition of the original type series of each of these species is inferred. In 1955 some of the type material was still said to exist, but by now all of Takakuwa’s specimens of these species seem to have been lost.

著者

Akifumi Ohtaka

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.27, no.1, pp.95-100, 2022-04-15 (Released:2022-04-15)

参考文献数

29

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Pristina multiseta sp. nov. is described from rice paddies in Japan. This species resembles P. aequiseta Bourne, 1891 and P. evelinae Marcus, 1943 in having proboscis and shortly bifid distal ends of dorsal needles, however P. multiseta is distinguished from these species by the short proboscis, a higher number of chaetae in dorsal bundles, and enlarged ventral chaetae from IV through VII. Thin vessels surrounding the ectal half of the atria in this species are unique in the genus.

著者

Hiroyuki Ariyama Katsutoshi Kawabe

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.27, no.1, pp.113-128, 2022-04-15 (Released:2022-04-15)

参考文献数

36

---

Two new species of the aorid Amphipoda are described from Chichijima Island, the Ogasawara Islands in Japan. Aoroides macrops sp. nov. from shallow water is characterized by the heavily setose male gnathopod 1, the coxa of which bears several plumose setae anteriorly, and the uropod 2 with a short inter-ramal process. This species is very similar to A. longimerus Ren and Zheng, 1996; however, this new species can be distinguished from A. longimerus by the larger eyes, the shorter carpus of the male gnathopod 1, and the shorter carpi of the pereopods 3 and 4. Grandidierella ogasawarensis sp. nov. from river mouth has the male gnathopod 1 with two teeth on the carpus and an anterodistal projection on the propodus, the male gnathopod 2 with an elongate carpus, and the uropod 1 bearing an inter-ramal process. This new species is different from its closely related congeners (G. koa Barnard, 1977; G. insulae Myers, 1981; and G. rubroantennata Ariyama and Taru, 2017) in the separated teeth on the carpus of the male gnathopod 1.

著者

Hiroyuki Ariyama

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.26, no.1, pp.79-91, 2021-03-22 (Released:2021-03-22)

参考文献数

15

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Two species of the paracalliopiid Amphipoda are recorded from the Ryukyu Archipelago in Japan, one of which is Mucrocalliope ryukyuensis sp. nov., the second species of the genus. This new species is very similar to the type species, M. shimantoensis Ariyama and Azuma, 2011 from the Shimanto estuary, western Japan; however, M. ryukyuensis can be distinguished from M. shimantoensis by the longer peduncular article 4 of the male antenna 2 and the basis of the male pereopod 5 with a posteromedial plumose seta. The other species is Paracalliope dichotomus Morino, 1991; its morphology in female and the coloration are firstly described.

著者

Taiga Kunishima Ryosuke Tanaka Kentarou Hirashima Ken Maeda

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.26, no.1, pp.37-41, 2021-03-05 (Released:2021-03-05)

参考文献数

29

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One female specimen of Stiphodon multisquamus Wu and Ni, 1986 was collected from Arida-gawa River, Wakayama Prefecture, Japan, in November 2018. As the previously known range of this species was from the South China Sea, including Malaysia, Vietnam, and China, to the Ryukyu Archipelago in Japan, this specimen was reported as the first record from the Japanese mainland and the northernmost record of this species. Stiphodon multisquamus is an amphidromous fish of which pelagic larvae develop in marine habitats. It was believed that this specimen was transported from the southern region by ocean currents during the pelagic larval phase and recruited into the river in Wakayama Prefecture.

著者

Yuki Oya Hiroshi Kajihara

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.24, no.1, pp.1-6, 2019-05-25 (Released:2019-01-25)

参考文献数

28

被引用文献数

6

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We describe a new species of polyclad flatworm, Phaenoplana kopepe sp. nov., from Chichijima island in the Ogasawara Islands, Japan. This is the first report of Phaenoplana from Japan. Phaenoplana kopepe sp. nov. is characterized by i) a vagina that curves anteriorly, ii) gonopores well-separated from each other, and iii) a Lang’s duct that is shorter than the vagina. We provide a partial sequence (610 bp) from the mitochondrial cytochrome c oxidase subunit I gene as a DNA barcode for the species.

著者

Takafumi Nakano Yi-Te Lai

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.22, no.2, pp.143-150, 2017-11-25 (Released:2017-12-05)

参考文献数

21

被引用文献数

4

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A quadrannulate leech species, Orobdella meisai sp. nov., from southern Taiwan is described. This new species is characterized by its camouflage coloration, which is unique among the known Orobdella species. Orobdella meisai is the second species of the genus to be described from Taiwan. Phylogenetic analyses using nuclear 18S rRNA, histone H3, mitochondrial cytochrome c oxidase subunit I, tRNACys, tRNAMet, 12S rRNA, tRNAVal, 16S rRNA, tRNALeu and NADH dehydrogenase subunit 1 markers showed that O. meisai and another Taiwanese species, O. ketagalan Nakano and Lai, 2012, formed a supported clade. According to the results of the morphological examination and the phylogenetic position of O. meisai, morphological-phylogenetic relationships of this species and close congeners are briefly discussed.

著者

Masato Nitta

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.28, no.2, pp.273-284, 2023-11-24 (Released:2023-11-24)

参考文献数

96

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Specimens of Gyrodactylus cyprini Diarova, 1964 (Monogenea: Gyrodactylidae) and Dactylogyrus extensus Mueller and Van Cleave, 1932 (Monogenea: Dactylogyridae) were obtained from the common carp Cyprinus carpio Linnaeus, 1758, which was reared in an outdoor pond at the Tamaki Field Station of the Fisheries Technology Institute, Mie Prefecture, Japan. Although G. cyprini is a well-known parasite of C. carpio in the Palearctic and USA and its existence in Japan was implied by the dermatitis examination of exported koi carp from Japan to Thailand, any specimen of G. cyprini has not been recorded in Japan. In addition, I determined some Japanese specimens previously identified as G. kherulensis Ergens, 1974 were also G. cyprini. This study obtained novel geographical records of these monogeneans, along with redescriptions of three monogenean species and molecular data of G. cyprini and D. extensus.

著者

Masanori Nonaka Takeshi Hayashibara

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.26, no.2, pp.297-342, 2021-10-14 (Released:2021-10-14)

参考文献数

34

被引用文献数

2

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Investigations were carried out on 22 deep-water octocoral specimens in the family Coralliidae sampled from the Emperor Seamounts during 2009 to 2012. The specimens were collected from 350–1100 m deep, mostly from the southernmost region of the Emperor Seamounts. Colonies were identified by visual and microscopic observation of standard morphological characters (colony size, diameters of colony base and branches, diameter and height of autozooid mound, thickness of coenenchyme and sclerite sizes, etc.) along with supporting information from molecular DNA analysis. Half of the 22 specimens were identified as Pleurocorallium cf. pusillum (Kishinouye, 1903), suggesting that the species called “Mid” that was once harvested dominantly in this area was this species. The remaining 11 specimens were identified as genus Hemicorallium Gray, 1867. These were identified as belonging to the following species: one previously described species [H. laauense (Bayer, 1956)], three similar species [H. cf. abyssale (Bayer, 1956), H. cf. regale (Bayer, 1956), H. cf. sulcatum (Kishinouye, 1903)] and three new species (H. kaiyo sp. nov., H. muzikae sp. nov. and H. tokiyasui sp. nov.).

著者

Hajime Saito

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.27, no.2, pp.329-340, 2022-11-03 (Released:2022-11-03)

参考文献数

31

被引用文献数

1

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Two species of diplogyniid mites, Lobogynium sudhiri (Datta, 1985) and Neolobogynium sorae sp. nov., were found on histerid, synteliid, and geotrupid beetles in Japan. Two species of beetles are reported as new hosts of L. sudhiri. Neolobogynium sorae shows notable sexual dimorphosis in dorsal chaetotaxy. Key to species of Neolobogynium Hicks, 1957 is provided.

著者

Sue Yeon Lee Seung Tae Kim

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.26, no.2, pp.165-169, 2021-06-17 (Released:2021-06-17)

参考文献数

16

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Yunohamella varietas sp. n., from Ulsan Metropolitan City, Korea is newly described based on the male. The new species is closely related to Yunohamella lyrica (Walckenaer, 1841) and Yunohamella serpatusa (Guan and Zhu in Zhu et al., 1993), but can be distinguished from Y. lyrica and Y. serpatusa by the dorsal pattern of the abdomen, shape of embolus, conductor and median apophysis. The new species was collected with a sweep net in rice fields.

著者

Masato Nitta Kazuya Nagasawa

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.25, no.1, pp.61-73, 2020-02-15 (Released:2020-02-15)

参考文献数

147

被引用文献数

5

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Four species of alien parasites, Dactylogyrus skrjabini Achmerow, 1954, D. hypophthalmichthys Achmerow, 1952, D. wuhuensis Lee, 1960 (Platyhelminthes: Monogenea: Dactylogyridae), and Sinergasilus lieni Yin, 1949 (Crustacea: Copepoda: Ergasilidae), were collected from the gills of the alien cyprinid, the silver carp Hypophthalmichthys molitrix (Valenciennes, 1844) in the Watarase River flowing into the Watarase Retarding Basin, Tochigi Prefecture, central Japan. These alien parasites represent new geographical records from Japan. The generic position of D. skrjabini has been doubted because its dorsal anchor shape is similar to those of Pellucidhaptor spp. (Dactylogyridae), but the species should be assigned to Dactylogyrus based on the phylogenetic analysis of 28S rDNA made in this study. The scientific name “Pseudergasilus polycolpus Markewitsch, 1939” is an incorrect subsequent spelling of P. undulatus Markewitsch, 1940, and S. lieni is the oldest available name that can be applied to the ergasilid found in this study.

著者

Ian G. Gleadall

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.21, no.1, pp.31-42, 2016-05-25 (Released:2017-02-01)

参考文献数

44

被引用文献数

16 50

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The East Asian common octopus has long been synonymized with the Atlantic and Mediterranean species Octopus vulgaris Cuvier, 1797. However, evidence from molecular genetic studies has firmly established that the so-called cosmopolitan common octopus is in fact a group of several biogeographically distinct populations which form a complex of species with closely similar morphology. Here, a diagnosis and brief description are provided which distinguish the East Asian common octopus from O. vulgaris, and as a suitable name for it a former junior synonym of O. vulgaris is identified as a valid species: Octopus sinensis d'Orbigny, 1841. A neotype is designated. Voucher material includes specimens collected in Japan by Philipp Franz von Siebold and deposited in the National Museum of Natural History - Naturalis - in Leiden; and others that were studied by Madoka Sasaki in preparation for the detailed description of this species (as O. vulgaris) in a monograph on Japanese Cephalopoda published in 1929. At present, all species in this complex (particularly O. vulgaris and the East Asian species here identified as O. sinensis) are highly vulnerable to overfishing, so recognizing O. sinensis as a species distinct from O. vulgaris is an important step towards improving sustainable fisheries management policies for each species in this group of commercially valuable octopuses.

著者

Keiichi Kakui Daisuke Uyeno Tohru Naruse

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.24, no.1, pp.49-60, 2019-05-25 (Released:2019-05-25)

参考文献数

40

被引用文献数

1

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We describe Parakonarus kajii sp. nov. from near Iriomote Island, Ryukyu Islands, southwestern Japan. This is the first record of Parakonarus from the North Pacific. As members in this genus show great sexual dimorphism, we checked our male and female specimens for conspecificity by using partial sequences of the cytochrome c oxidase subunit I (COI) gene. The two individuals differed by two nucleotide substitutions in 661 nt (0.3% K2P distance), indicating they are the same species. This species closely resembles P. kopure reported from New Zealand, but differs in having the ventral process on the chelipedal carpus longer than wide, the inner comb-row on the chelipedal propodus composed of 16 setae, and the dactylus and unguis of pereopods 4–6 fused in the male; and the carpi of pereopods 2 and 3 without a ventrodistal spiniform seta, the propodal palm of the cheliped with two inner simple setae at the insertion of the dactylus, and article 2 of the maxillipedal palp with one mid-outer and one outer distal simple setae in the female. On the inner surface of the chelipeds in male P. kajii, we observed an elongate plate-like structure that could be a reduced ischium.

著者

Shinta Fujimoto

出版者

The Japanese Society of Systematic Zoology

雑誌

Species Diversity (ISSN:13421670)

巻号頁・発行日

vol.23, no.2, pp.209-213, 2018-11-25 (Released:2018-11-25)

参考文献数

17

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Tanarctus ittanmomen sp. nov. (Heterotardigrada: Arthrotardigrada: Tanarctidae) is described based on specimens collected at Ohama Beach, Miyato-jima, Oku-Matsushima, Japan. The new species is distinguished from its congeners by its characteristic leg IV appendages. Each appendage consists of one long main branch, usually more than double the body length, with varying numbers of flexible, mostly long secondary branches. All branches have blunt tips.