著者

大塚 攻

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.21, pp.1-12, 2006-08-20 (Released:2018-03-30)

参考文献数

53

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Free-living copepods are regarded as one of the most ecologically important animal groups in aquatic ecosystems, but systematic and phylogenetic surveys of these crustaceans are still incomplete. In recent years my colleagues and I have newly established five families, 11 genera, three subgenera, and 59 species of copepods. Our success in finding previously unknown forms is partly a result of our focus on collections from hitherto poorly sampled hyperbenthic layers. The peculiar swarming behavior, distinct vertical migrations, and unknown life cycles of many species also make their collection difficult. We were the first to discover copepods of the order Platycopioida in the Indo-Pacific region; based on a circumtropical distribution and has thus come to be understood as a Tethyan relict. Another example of biogeographical significance is a new cavernicolous species of the calanoid copepod genus Ridgewayia that we described from Palau, which shows a closer relationship to the Atlantic-Mediterranean species group of this genus than to the Indo-West Pacific species group. This suggests dispersal by the westward circumtropical current that existed from the late Jurassic to the Miocene. We have also described three families, three genera and four species of parasitic copepods that infect fishes, sea urchins, bivalves and mysids. In addition to copepods, four tantulocaridans, one ascothoracidan, and three peracaridans were newly described as a result of collaboraive work with specialists on these groups. Copepods with a basic developmental pattern comprising six naupliar, and six copepodid stages, are a relatively easy group to tracehomologous features when compared to other crustaceans. This fact makes phylogenetic analyses of copepods feasible. Better understanding of the phylogeny of copepods not only leads to revisions of their classification system, but also allows us to make certain deductions concerning evolutionary patterns and processes that are related to, for example, their habitat exploitation, direction of dispersal, and switching of feeding mode or host. Our analyses have thus led us to infer that members of the calanoid superfamily Arietelloidea have exploited a wide range of habitats, both horizontally from coastal to oceanic regions and vertically from the surface to the deep hyperbenthic layers, with recolonization therefrom into the original, coastal benthic habitat. We have also been able to reconstruct a switch in feeding from suspension feeding to carnivory in the calanoid family Heterorhabdidae, a trend leading to carnivorous taxa that employ a venom-injecting system for capture of prey. This sophisticated feeding structure seems to have been constructed by modification of prototypes that were present in the suspension-feeding ancestor, resulting in a drastic functional change in feeding without much alternation of its form.

著者

宮崎 勝己 小林 豊 鳥羽 光晴 土屋 仁

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.28, pp.45-54, 2010-02-20 (Released:2018-03-30)

参考文献数

44

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The biology of Nymphonella tapetis Ohshima, 1927, a pycnogonid endoparasitic on some bivalves, is reviewed. After the first discovery of this species from Hakata Bay, Fukuoka in 1926, there were scattered records of N. tapetis from several places in Japan before 2007, but they were on a small scale. In April 2007, N. tapetis appeared suddenly in the commercial bivalve, Ruditapes philippinarum and several other bivalves on the Banzu Tidal Flat in Tokyo Bay. The spread of the parasite was explosive, and caused a mass mortality of the bivalves in the area. Adults of the pycnogonid live freely on or just under the surface of sandy bottoms, and show nocturnal activity. The hatching larva is a typical protonymphon larva. The larva enters the host bivalve, attaches to various soft parts, and feeds on the body fluid of the host. The number of parasites in one host ranges from one to over 60. At least eight different developmental stages can be distinguished in the parasitic larvae and juveniles. Adults leave the host probably just after the maturation molt. The adult male receives one egg-mass onto his ovigers after each mating, and one male can bear up to seven egg-masses. Several experiments were undertaken to attempt to eradicate or reduce the number of N. tapetis, but no effective method has yet been found. Three species of the genus Nymphonella have been described from Japan, the Mediterranean, and southern Africa. They are very similar in morphology, which leads to potential taxonomic confusion.

著者

藤田 喜久

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.44, pp.15-22, 2018-02-28 (Released:2018-03-20)

参考文献数

43

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Recent studies of decapod crustaceans in anchialine and submarine caves of the Ryukyu Islands were reviewed. A total of 10 species, belonging to 7 genera of 5 families, have been recorded in anchialine caves, and all of them are listed on the Red List (List of Endangered and Threatened Species in Japan or Okinawa Prefecture). In the submarine caves, remarkable findings of decapods and other crustaceans are continuing even in recent years. Further “many eyes” will be poured into the submarine caves, it is expected that the characteristics of the animal communities in the Ryukyu Islands will be understood in more detail.

著者

藤原 恭司 高山 真由美 桜井 雄 本村 浩之

出版者

日本動物分類学会

雑誌

タクサ : 日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

no.39, pp.40-46, 2015-08-31

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The Duskytail Grouper, Epinephelus bleekeri (Perciformes: Serranidae), is recorded from Tanega-shima and Amami-oshima islands and the Yaeyama Islands in the Ryukyu Islands, southern Japan on the basis of six specimens (232.6-581.2 mm standard length). In addition, several records of E. bleekeri by photographs and/or observations from Kanagawa, Kochi, Ehime, Miyazaki, and Kagoshima prefectures are confirmed. Because E. bleekeri has previously been recorded from Taiwan and southward, the present specimens represent the first reliable records of the species from Japanese waters on the basis of collected specimens. Distributional implications of E. bleekeri in Japanese waters are discussed.

著者

森下 悟至 本村 浩之

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.44, pp.58-63, 2018-02-28 (Released:2018-03-20)

参考文献数

19

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Six specimens (39.9–81.4 mm standard length) of the Round Scorpionfish Neomerinthe erostris (Alcock, 1896) (Scorpaenidae), previously recorded from the Indo-West Pacific and in the western Pacific from Taiwan to New Caledonia and the Wallis and Futuna Islands, were collected from Uchinoura Bay, Osumi Peninsula; southern Okinawa Trough; and Iriomote Island, Yaeyama Islands, southern Japan. The six specimens represent the first records of N. erostris from Japanese waters and include the northernmost records (Uchinoura Bay) for the species. The Japanese specimens are described here in detail and the new Japanese name “Yabusame-kasago” is proposed for the species.

著者

平嶋 義宏

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.9, pp.13-14, 2000-08-20 (Released:2018-03-30)

著者

田辺 力 曽田 貞滋

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.52, pp.24-25, 2022-02-28 (Released:2022-03-01)

参考文献数

5

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Mechanical isolation found in two sympatric species of Parafontaria millipedes is caused by mismatched genital and body sizes between sexes during mating. Effective precopulatory isolation is lacked between the two species.

著者

西川 輝昭

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.51, pp.19-28, 2021-08-31 (Released:2021-08-31)

参考文献数

48

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Baron Yoshio Tanaka (1838–1916), a famous historical researcher of natural history based in the “honzo-gaku” (traditional natural history) developed in the Edo Period in Japan, established himself as a talented and energetic higher governmental official in early modern Japan, establishing the National Museum. He also contributed much to the development of modern biological education by the compilation of wallcharts and translations of European and American textbooks into Japanese, and improved understanding of agricultural and fisheries products. He is therefore regarded to have bridged the gap between pre-modern and modern approaches in biology (especially botany), although his influence in the understanding of ascidians has been overlooked. However, a hand-written and previously unknown manuscript on this animal group by Tanaka (dated 1882), translated here into modern Japanese with detailed explanatory notes, included references to dissected museum specimens, evidence of Tanaka’s modern approach, since dissection and museum-deposition of specimens had not been practiced in “honzo-gaku”. The only cited western article in the manuscript, entitled “Cuvier’s molluscs”, was identified as Deshayes’ molluscan volume [completed in 1845 and including good figures of ascidian anatomy] included in the third edition of Cuvier’s “Le Règne Animal”, issued between 1836 and 1849. However, Tanaka made no reference to Lankester’s “urochordate” concept, published in 1877, and left no detailed figures of ascidian anatomy, necessary for modern taxonomy. In fact, the modern taxonomy of Japanese ascidians was begun in 1882 by foreign taxonomists, to be followed soon after by a Japanese researcher, Dr. Asajiro Oka. However, these endeavors did not avail themselves of Tanaka’s museum specimens, which were possibly unavailable even then, due to irregular museum deposition practice. It is clear that the gap between pre-modern and modern practices, was very significant in the case of ascidians.

著者

朝倉 彰

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.12, pp.20-27, 2002-02-20 (Released:2018-03-30)

著者

石川 忠

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.19, pp.20-33, 2005-08-20 (Released:2018-03-30)

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The family Reduviidae, or assassin bugs, is highly diverse in its number of taxa, morphology, habitat, and feeding behavior. It is the second largest family in terms of the number of species, in the suborder Heteroptera, or true bugs, with about 6,800 species classified into at least 23 subfamilies. The diversity in morphology is explained here using examples of four subfamilies, viz., the Harpactorinae having a general form, the Emesinae characterized by a strikingly slender body and appendages, the Holoptilinae with the body and appendages densely covered with very long setae, and the Phymatinae having forelegs strongly specialized for capturing prey. Reduviids are found on the living leaves of trees, on tree trunks, under the bark of rotten trees, on dead branches with leaves, in grasslands, including marshes, among leaf-litter of forest floors, and so on. Among the subfamilies in the Reduviidae, the Centrocnemidinae exclusively live on the tree trunks and their body surface strongly resembles a trunk in color and structure; the Emesinae contains unique inhabitants of lava tubes and spider webs. All reduviids are predatory and food items range from small arthropods, such as insects, to mammal blood, including that of humans. Different subfamilies or tribes have developed distinctive feeding methods and behavior. For example, the Harpactorinae pin their prey using the anteriorly extended rostrum, and the Emesinae catch their prey by the quick movement of their raptorial forelegs. The history of taxonomic and faunal studies on the Japanese Reduviidae is briefly documented. Eighty-two species in 45 genera (nine subfamilies) are currently recognized in Japan. Finally, approximately 120 species are estimated to occur in the country.

著者

中坊 徹次

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.30, pp.31-54, 2011-02-20 (Released:2018-03-30)

参考文献数

140

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Oncorhynchus kawamurae (Osteichthyes : Salmonidae) (Japanese name "Kunimasu"), a species endemic to Lake Tazawa, Akita Prefecture, Japan, was believed to have become extinct just before World War II. However, it was discovered in March and April, 2010 in Lake Saiko, Yamanashi Prefecture, one of the lakes to which eyed eggs of the species were introduced in 1935. The species is unique within Oncorhynchus in occurring normally in depths of 150-270m (water temperature 3.8-4.2℃), and spawning in 105-225m depth around September (3.8-4.5℃) and 15m depth (shallowest recorded) around February (3.0-4.6℃). Although Kunimasu shares the lake-spawning characteristic with the North American kokanee (O. nerka), no populations of the latter occur and spawn in such depths or temperatures. The specific distinctiveness of the black-coloured kunimasu from kokanee is here supported by morphological and biological characteristics recorded in pre-1941 literature. Because of the low temperatures tolerated during spawning, Kunimasu may have been derived from a population of "O. nerka" in the early Pleistocene (ca. 160 my BP), Lake Tazawa having become established at about that time. Subsequent climatic changes during the Pleistocene and Holocene resulted in the species necessarily moving into colder (deeper) water.

著者

金子 奈都美 窪寺 恒己

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.22, pp.38-43, 2007-02-20 (Released:2018-03-30)

参考文献数

14

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Specimens of two small octopus species collected from intertidal waters of the Ryukyus were identified as species of Abdopus, based on the following combination of characters: small to medium body (<70mm ML) with long arms (>4×ML), arm autotomy, number of gill lamellae (6-7 per demibranch), enlarged suckers on second and third arms of male, hectocotilized arm with small ligula (<2.3% of hectocotylized arm), and highly sculptured skin. Two specimens collected at Oku and Sesoko, northern parts of Okinawa Island were identified as A. abaculus due to the presence of large circular white spots on dorsal mantle and dorsal arm surfaces. Four specimens collected from Awase at Okinawa Island, Kabira at Ishigaki Island, and Nakano at Iriomote Island were identified as A. aculeatus by their brownish yellow body color, comparatively large body (37.7-51.0mm), long arms (6-9×ML), and highly sculptured skin with primary papillae on dorsal mantle and above eyes. Abdopus aculeatus had been confused with Octopus oliveri in the Japanese literature. These two species were distinguished by arm length (<5×ML in O. oliveri), number of gill lamellae (7-8 in O. oliveri), body color (dark purple in O. oliveri), presence of papillae above the eyes (absent in O. oliveri), and shape of penis (V-shape in O. oliveri versus linear in A. aculeatus). These specimens are the first records of Abdopus from Japanese waters as well as the northern-most records for both species.

著者

島野 智之

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.53, pp.64-65, 2022-08-31 (Released:2022-08-31)

参考文献数

8

著者

長澤 和也 谷口 倫太郎

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.51, pp.29-37, 2021-08-31 (Released:2021-08-31)

参考文献数

45

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An adult female of the argulid branchiuran Argulus coregoni Thorell, 1864 was collected from the dorsal body surface of an oily bitterling, Tanakia limbata (Temminck and Schlegel, 1846) (Cyprinidae: Acheilognathinae), in the lower reaches of the Asahi River, Okayama Prefecture, western Japan. This represents a new host record for A. coregoni and its new prefectural record in Japan. The external morphology of the female collected is reported in detail. Tanakia limbata is the second acheilognathine host of A. coregoni. The occurrence of A. coregoni on the oily bitterling is unusual because this parasite usually infects various salmonids and ayu, Plecoglossus altivelis altivelis Temminck and Schlegel, 1846 (Plecoglossidae), in the upper and middle or lower-reaches of rivers, respectively, in central and western Japan. The individual of A. coregoni probably parasitized the oily bitterling after detachment from ayu near the collection locality.

著者

三中 信宏

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.19, pp.95-101, 2005-08-20 (Released:2018-03-30)

著者

鶴崎 展巨

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.52, pp.4-16, 2022-02-28 (Released:2022-03-01)

参考文献数

67

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Reproductive interference may be liable to occur in harvestmen, because of their non-elaborated mating behavior and presence of nuptial gifts that may elicit females’ less discrimination to mates. Thus, it is probable that a substantial difference in body size is crucial for building sympatry for two closely related species of harvestmen lacking an effective pre-mating barrier for reproductive isolation. I will review some possible cases of character displacement found in Japanese harvestmen: 1) Leiobunum montanum and L. hiraiwai: These two species occurring widely in beech forests in western Japan show a checkerboard pattern of distribution, i.e., they do not coexist in a single local area. A single exception to the rule is found on the northern slope of Mt. Hyonosen, Tottori, where L. montanum getting extremely elongated body coexists with L. hiraiwai. 2) Gagrellula ferruginea and G. testacea: Distributional ranges of the two species meet at the western part of Hiroshima Prefecture, making a narrow zone of sympatry, though a few introgressions of genes are also indicated. Gagrellula testacea becomes smaller in Kyushu where larger G. grandis occurs and attains the smallest body in Shikoku where it becomes sympatric with G. ferruginea. Other examples include 3) Nelima genufusca, N. nigricoxa, and related species; 4) Pseudobiantes japonicus and Epedanellus tuberculatus (Laniatores: Epedanidae).

著者

小松 美英子

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.27, pp.1-16, 2009-08-20 (Released:2018-03-30)

参考文献数

123

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Echinoderms display a great range of life histories, which my students, colleagues, and I have documented though our studies of 42 species, including one echinoid, one holothuroid, four ophiuroids, and 36 asteroids. Here, the general features of echinoderm reproduction are reviewed as they concern the following topics: pairing behavior, brooding, sexual dimorphism, dioecism/hermaphroditism, and others. Larval form in these echinoderms has been modified in various ways through adaptation to planktonic, benthic, intra-gonadal, or intra-gastric larval habitats. The elucidation by Kanatani of the hormonal control mechanism of reproduction in asteroids has provided a means to investigate various aspects of their life history in detail, especially in the genera Asterina, Astropecten, and Luidia. We have found asteroids that pass through a wrinkled blastula stage, divergences among species of Asterina and Astropectinidae, astropectinid sea stars with a newly discovered barrel-shaped larva, and the limits of occurrence of the non-brachiolarian type of development in the Astropectinidae and Luidiidae. The life history of astropectinid species, including both a bipinnaria and a barrel-shaped larva, differs from that of luiidiids, with only a bipinnaria. On this basis, we suggest that the Astropectinidae and Luidiidae probably do not belong to the same ordinal-level taxonomic group. This result agrees with the 18S rDNA-based asteroid phylogeny previously reported by Matsubara and us.

著者

大塚 攻 田中 隼人

出版者

日本動物分類学会

雑誌

タクサ:日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

vol.48, pp.49-62, 2020

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<p>One of the major crustacean groups, Maxillopoda had accommodated Mystacocarida, Copepoda, Thecostraca, Tantulocarida, Ostracoda, Branchiura, Pentastomida, and some fossil taxa, and was generally defined by some combinations of the following characters: body tagma composed of 5 cephalic, 6 (or 7) thoracic and 5 (or 4) abdominal somites; male gonopore (s) located on the first abdominal somite; uniramous antennules; naupliar eyes with tapetal cells, and so on. However, the monophyly of maxillopodans is totally rejected by a number of genetic analyses, while palaeontological and morphological approaches still recognize not only maxillopodans but also entomostracans as valid taxa. Since this issue is not well documented in Japan, the present paper briefly introduces modern phylogenetic studies on maxillopodan crustaceans, in particular Copepoda and Ostracoda.</p>

著者

古屋 秀隆 Lu C.C. Hochberg F.G.

出版者

日本動物分類学会

雑誌

タクサ : 日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

no.9, pp.41-42, 2000-08-20

著者

小林 麻理 佐藤 矩行 古屋 秀隆 Holland Peter W.H.

出版者

日本動物分類学会

雑誌

タクサ : 日本動物分類学会誌 (ISSN:13422367)

巻号頁・発行日

no.9, 2000-08-20