著者

Wataru Doi Ren Kikuchi Akira Mizutani Hiroyoshi Kohno

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.137-145, 2022-12-06 (Released:2022-12-06)

参考文献数

36

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To characterize the reproductive behavior of the land crab Cardisoma carnifex, their nighttime activities on the ground surface around their burrows were monitored using infrared-triggered cameras on the Iriomote-jima Island, Japan. Matings of three pairs were recorded near the entrance of the female’s burrow. The results showed that the species shares a common mating pattern of gecarcinids: hard-female mating and short courtship. The males did not exhibit courtship behavior, except for drumming on the surface sediment. The duration of copulation was longer (29, 30, and 49 min) than that in the reference data (1–10 min). After mating, males guarded their mate’s burrow and plugged the opening from the outside. By contrast, the resident crabs sometimes plug their burrows from the inside. Burrow plugging by C. carnifex males is similar to post-copulatory guarding by males of brachyurans, to prevent multiple matings by females. The non-invasive cameras revealed novel features of mating behavior of C. carnifex such as longer copulation, drumming behavior, and burrow plugging by males.

著者

Tetsuya Sanda Tomohito Shimizu Shigeki Dan Katsuyuki Hamasaki

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.129-135, 2022-11-09 (Released:2022-11-09)

参考文献数

23

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Temperature is one of the most important environmental factors affecting the geographic distribution of ectotherms. We evaluated the low- and high-temperature tolerance limits of juveniles of two mud crab species, Scylla paramamosain and Scylla serrata, which are distributed in temperate and subtropical/tropical areas in Japan, respectively. Experiments were performed twice for S. paramamosain and four times for S. serrata using laboratory-raised juveniles. The juveniles were stocked in small containers, and the temperature was reduced or raised by 1°C every 24 h. The critical low or high temperatures (CLT or CHT) were estimated as the temperatures at which 50% of test juveniles ceased walking behaviour or died. The estimated CLT values for walking and survival were summarised as 8.4±0.7°C (mean±standard deviation) and 6.4±0.9°C in S. paramamosain and 9.6±0.6°C and 7.4±0.4°C in S. serrata, respectively. The CHT for walking could not be estimated, as almost all surviving juveniles exhibited walking behaviour, whereas the estimated CHT values for survival were summarised as 39.0±0.4°C in S. paramamosain and 39.1±0.6°C in S. serrata. Thus, interspecific variation in low-temperature adaptation was evident, and S. paramamosain are adapted to the lower-temperature environment.

著者

Noriko Azuma Masamichi Kuroda Yuichi Katogi Susumu Chiba

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.123-127, 2022-11-09 (Released:2022-11-09)

参考文献数

12

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We developed short tandem repeat markers for Palaemon septemtrionalis and tested their utility for analysing population genetics. Six markers were selected for their genotyping ability and suitability for population genetic analyses, and the genetic differences between two populations from different rivers were evaluated using these markers. The pairwise fixation index value between the two populations was 0.01756 (P=0.036), weak but statistically significant, suggesting a low level of genetic differentiation between the two populations. Although the results were not fully conclusive, we are confident these markers can be utilised for investigating the genetic population structure of P. septemtrionalis.

著者

Peter K. L. Ng Paul F. Clark

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.115-121, 2022-10-21 (Released:2022-10-21)

参考文献数

19

被引用文献数

1

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An un-named Eosamon Yeo & Ng, 2007 (Brachyura: Potamidae) specimen was discovered in the reference collection of the Natural History Museum, London. Further investigation of this freshwater crab proved it to be of interest because it is the first record of the genus from Cambodia and the male to be a hitherto undescribed Eosamon species. The new species, E. cambodiense n. sp., is here described, illustrated and compared with other congeners: E. brousmichei (Rathbun, 1904), E. paludosum (Rathbun, 1904), E. hafniensis (Bott, 1966), E. yotdomense (Naiyanetr, 1984), E. boonyaratae (Naiyanetr, 1987), E. phuphanense Naiyanetr, 1992, and E. nominathuis Yeo, 2010.

著者

Sota Nishimoto Katsuyuki Hamasaki Shigeki Dan

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.103-110, 2022-09-17 (Released:2022-09-17)

参考文献数

32

被引用文献数

3

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The red swamp crayfish Procambarus clarkii is an invasive alien species worldwide but it was commercially exploited. Laboratory studies have been conducted to examine the reproductive aspects of this species, pairing males and females for 1–5 days, as a basis for developing the control measures for invasive populations and improving aquaculture technologies. However, the effect of pairing periods on the mating and spawning success is largely unknown, and the present study therefore aimed to elucidate the effect of different periods (one, five and 10 days) in this species. The pairs were videorecorded for each entire pairing period, and the length of pairing did not significantly affect copulation or spawning. Copulation was prolific on the first day and its intensity was similar among the test groups, indicating that a one-day pairing period is sufficient for successful mating in P. clarkii under laboratory conditions.

著者

Kazuya Nagasawa Shigehiko Urawa

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.91-101, 2022-08-26 (Released:2022-08-26)

参考文献数

36

被引用文献数

3

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Two copepod parasites, Salmincola edwardsii (Olsson, 1869) and S. markewitschi Shedko & Shedko, 2002, were collected from salmonids in eastern Hokkaido, Japan: these copepods were taken from whitespotted char, Salvelinus leucomaenis (Pallas, 1814), and brook trout, S. fontinalis (Mitchill, 1814) in the Nishibetsu River, and Salmincola edwardsii from southern Asian Dolly Varden, Salvelinus malma krascheninnikova Taranetz, 1933, in the Ichani River. Both whitespotted char and brook trout are new Japanese hosts for Salmincola edwardsii, and the two rivers represent new locality records for S. edwardsii and S. markewitschi. The Nishibetsu River is regarded as a new southernmost distribution limit of S. edwardsii in Asia and is also recorded as the first locality of S. markewitschi infecting wild salmonids in Hokkaido. The morphology of S. edwardsii and S. markewitschi is reported based on adult female specimens collected from the salmonids.

著者

Karl J. Wittmann

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.55-89, 2022 (Released:2022-07-23)

参考文献数

53

被引用文献数

1

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Three ANDEEP expeditions yielded five Petalophthalmidae species of the genus Hansenomysis in 1030–3683 m depth on the floor of the Southern Ocean. Hansenomysis pseudophthalma sp. nov. is distinguished by features of the carapace, antenna, and telson. A fully adult specimen is first described for H. chini. A world key to the species of Hansenomysis is given. Unlike certain previous interpretations, the dactylus of thoracic endopods 3–5 has a single claw opposing a pair of modified paradactylary setae. Propodus and dactylus 6–8 are separate, not fused, and bear a smooth nail in all Hansenomysis species examined. Juveniles were available in three species and start with two bulb-shaped eye rudiments inside a common cuticular sheath forming a transverse bar. The bulbs then flatten, although a bulb-like formation persists until the adult stage; no eyeplate is formed. The carapace bears hepatic bulges resembling eyes in adult H. pseudophthalma and H. chini. The distal hyaline coat of bulges possibly represents lenses in H. pseudophthalma and H. sorbei. The modification of bulges is indicative of photophores, described for the first time here in the family Petalophthalmidae. The exclusive occurrence of mature photophores in adults points to possible role in reproductive behavior.

著者

Kazuya Nagasawa Kouki Mizuno

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.31-38, 2022-03-11 (Released:2022-03-11)

参考文献数

18

被引用文献数

1

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An ovigerous female of Argulus matuii Sikama, 1938 was collected from the body surface of a yellowfin seabream Acanthopagrus latus (Houttuyn, 1782) in a cove facing the Bungo Channel off Ehime Prefecture, western Japan. This represents a new host record for A. matuii, and the female collected is herein described. This female, which was fixed and preserved in 70% ethanol, showed a prominent body coloration, i.e., six streaks of yellow fringed with dark brown pigments, on the dorsal surface of the carapace even on 279th day (ca. nine months) after fixation, but the yellow streaks disappeared and the dark brown fringes were fading on 1675th day (ca. four years and seven months) after fixation. Thus, this paper reports on the usefulness of those yellow streaks in identification of A. matuii for a certain period after fixation but also emphasizes the importance of a detailed examination of morphological features in identification of long-term ethanol-preserved argulid specimens. The species is distinguished from the five marine congeners from Japan by its possession of numerous supporting rods in the marginal membranes of the first maxillae.

著者

Satoshi Kobayashi Miguel Vazquez Archdale

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.17-29, 2022-02-01 (Released:2022-02-01)

参考文献数

38

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This is the first record of the burrows of the Japanese mitten crab Eriocheir japonica. Morphologies of the burrows found in the clay sediment used by this crab were recorded by excavating them in a small freshwater river in Japan. Only E. japonica was found inside 2 of the 10 burrows examined (15 crabs and one crab, respectively), and the other 8 were empty. Crabs of various sizes (6.1–47.0 mm in carapace width) were collected from inside the occupied burrows. Burrow morphology ranged from single tunnels to complex burrows with multiple openings and tunnels. Openings (2–10 cm in diameter) were mostly located underwater. The single tunnels were 14–65 cm long. Considering the different digging habits of other burrowing animals found in this area, it can be concluded that E. japonica constructed these burrows. Burrows resembled those of the Chinese mitten crab E. sinensis, but were different in their location (freshwater vs. tidal), sediment type (clay vs. sand and silt), opening placement (mainly underwater vs. intertidal) and occupation rate (low vs. high). The low occupation rate suggests that E. japonica do not always rest in their burrows and rather prefer to hide beneath the riverbed’s large rocks. These results reflect the adaptation of E. japonica to the unstable environment of Japanese rivers.

著者

Kazuya Nagasawa Masanori Kawazu

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.51, pp.11-15, 2022-01-20 (Released:2022-01-20)

参考文献数

15

被引用文献数

1

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The pennellid copepod Lernaeenicus ramosus Kirtisinghe, 1956 is a parasite of perciform and blenniiform fishes in the Indo-West Pacific region. A metamorphosed female of the species was collected from a perchlet, Chelidoperca hirundinacea (Valenciennes, 1831), caught on the neritic continental shelf of Suruga Bay, central Japan. The copepod is almost exclusively a parasite of groupers (Epinephelus spp.) in the serranid subfamily Epinephelinae, but C. hirundinacea belongs to a different serranid subfamily Serraninae. The present collection of L. ramosus represents its first record from a serranine fish in the Indo-West Pacific region.

著者

Davie Peter J.F.

出版者

日本甲殻類学会

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.22, pp.65-74, 1993

被引用文献数

4

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相模湾以南台湾までの河口域にすむユビアカベンケイガニ(イワガニ科)はSesarma erythrodactylumの学名で知られている.基産地はシドニーである.しかし,日本産とオーストラリア産の標本を比較研究したところ,それぞれ独立した別種であることがわかった.このためユビアカベンケイガニを新種Sesarma actsとして記載した.なお,オーストラリアの種は原記載の綴りに従って,S. erythodactyla(Hess, 1865)とすべきである.

著者

浜野 龍夫 林 健一

出版者

一般社団法人 日本甲殻類学会

雑誌

甲殻類の研究 (ISSN:02873478)

巻号頁・発行日

vol.21, pp.1-13, 1992

被引用文献数

2 19

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The ecology of an atyid shrimp Caridina japonica was studied in the Shiwagi Rivulet. Yuki Town, Tokushima Pref. This species is amphidromous in nature. The juveniles migrate upstream from the sea exclusively during the night and can be seen climbing a vertical wall, where the rivulet water is trickling down. From field observation, rheotaxis seems, to be the most important orientation mechanism for the upstream migration of juveniles. The peak month of egg incubation was June. The mean duration of incubation was 40 days at 20℃ in aquaria. From these values and with known information on the duration of larval life, it was estimated that the period of upstream migration starts in August. Most males die within two years after metamorphosis, however, many females survive for more than two years.

著者

Holthuis L.B. Manning Raymond B.

出版者

日本甲殻類学会

雑誌

甲殻類の研究 (ISSN:02873478)

巻号頁・発行日

no.3, pp.p1-151, 1990-06

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Seventeen species of Dorippinae, distributed among eight genera, are recognized from the Indo-West Pacific region. The genera include Dorippe, with five species, Paradorippe, containing four species, Dorippoides, with two species, Heikea, new genus, recognized for two species formerly assigned to the genus Nobilum, and Medorippe, Neodorippe, Nobilum, and Philippidorippe, each containing one species. Representatives of all but one of the recognized genera of Dorippinae, Phyllodorippe Manning and Holthuis, 1981, containing one West African species, occur in the Indo-West Pacific. One genus and species that occurs in the eastern Atlantic and Mediterranean, Medorippe lanata (Linnaeus, 1767), is known from off South Africa and Madagascar. Otherwise the members of this subfamily are restricted to Indo-West Pacific localities. Several species of Dorippinae hold objects or species of anemones on their backs with their modified fourth and fifth legs, and representatives of several species play prominent roles in Chinese and Japanese folklore. In general, distribution patterns of known species are limited; no species extends across the Indo-West Pacific from the Red Sea and South Africa to Japan.

著者

郭 照良 鈴木 廣志

出版者

日本甲殻類学会

雑誌

Crustacean research (ISSN:02873478)

巻号頁・発行日

no.25, pp.98-103, 1996-12-20

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中国湖南省において,第1著者は近年大型甲殻類の生物地理学的研究を継続している.1992年8月,多数のヒメヌマエビ属の未記載の標本が採集された.本標本は,Caridina mengae,および"C.typus"グループのヌマエビ類と類似したが,背側が無歯の短い額角を持ち,第1胸脚の指部が掌部よりも長く,雄の第1腹肢内股基部に長い羽状毛を備え,尾部後縁中央には棘がなく,第3顎脚の各節の長さと幅の比によりC.mengaeと区別された.また,雄第1腹肢内肢の形状およびその内突起が内肢中央部からでることより,"C.typus"グループの他の10種とも容易に区別できた.以上のことから本種をヒメヌマエビ属の1新種,C.mengaeoidesとして記載した.

著者

駒井 智幸

出版者

日本甲殻類学会

雑誌

Crustacean research (ISSN:02873478)

巻号頁・発行日

no.23, pp.23-31, 1994-10-26

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岩手県宮古湾の潮間帯岩礁域から採集された3個体の標本に基づき、ホンヤドカリ属の新種Pagurus spina(新称:ヒメケアシホンヤドカリ)を記載した。本新種は、本邦沿岸に普通にみられるケアシホンヤドカリP. lanuginosus De Haanに類似するが、鉄脚の坐節腹面に棘をもつこと、右鋏掌部の内側縁に棘列を欠くこと、生時の色彩が異なるなどの特徴により容易に識別される。

著者

Komai Tomoyuki Hayashi Ken-Ichi Kohtsuka Hisanori

出版者

日本甲殻類学会

雑誌

Crustacean research (ISSN:02873478)

巻号頁・発行日

no.33, pp.103-125, 2004-12

被引用文献数

1

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Two new species of hippolytid shrimp, Lebbeus elegans sp. nov. and L. polyacanthus sp. nov., are described from the Sea of Japan, at depths of 250-400m. Lebbeus elegans is characterized by the absence of epipods on the second and third pereopods, distinct ventral blade of the rostrum and the rounded fourth abdominal pleuron. Lebbeus polyacanthus is compared with L. antarcticus (Hale, 1941), L. carinatus Zarenkov, 1976, and L. washingtonianus (Rathbun, 1902). Lebbeus polyacanthus differs from the latter three species in the more posteriorly arising posteriormost tooth of the dorsal rostral series and more numerous lateral spines on the meri of the third to fifth pereopods. Examination of the newly obtained material of L. kuboi Hayashi, 1992, enabled us to assess intraspecific variations of the species, including a variation in the development of the pereopodal epipods. Redescription of Lebbeus kuboi is provided and its affinity is discussed. These three species occur sympatrically. A brief note on the taxonomy and distribution of species of Lebbeus is also provided.

著者

Tetsuya Sanda Tomohito Shimizu Shigeki Dan Katsuyuki Hamasaki

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.50, pp.87-93, 2021-07-03 (Released:2021-07-03)

参考文献数

21

被引用文献数

2

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Cannibalism is considered a major cause of mortality among juveniles in nursery cultures of the mud crab Scylla serrata. Size grading is recommended as an effective measure to mitigate cannibalistic behavior; however, little is known about how body size differences influence cannibalistic episodes between juvenile individuals. We conducted one-to-one match experiments using hatchery-raised juveniles with carapace width between 12.5 and 33.3 mm. Two crabs were placed in an experimental arena for 24 h, and survival and pereiopod loss were subsequently observed. Large crabs always preyed on small crabs, and the probability of cannibalistic behavior significantly increased with the increasing relative size difference [RSD=1−(size of small crab)/(size of large crab)]. The loss of chelipeds and walking legs in the surviving small crabs amounted to 25% and 38%, respectively, and the proportion of lost walking legs increased with the increasing RSD, indicating the stronger aggressive behavior of larger crabs. This study suggests that maintaining size differences below the RSD threshold (0.34) at which 50% of the small crabs are cannibalized by large crabs would be an effective strategy to contain the occurrence of cannibalism in mud crab nursery cultures.

著者

Peter K. L. Ng Bertrand Richer De Forges

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.50, pp.95-101, 2021-07-13 (Released:2021-07-13)

参考文献数

6

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A new species of majid crab, Sakaija amicitiae n. sp., is described from New Caledonia Exclusive Economic Zone, Vauban seamount and the Chesterfield Atolls. The species is superficially similar to S. japonica (Rathbun, 1932) and S. santo Ng & Richer de Forges, 2015, from Vanuatu. Specimens from New Caladonia previously referred to S. santo are now referred to the new species. Sakaija amicitiae n. sp. can be distinguished from congeners by features of the carapace spines, proportions of the ambulatory legs and structure of the male first gonopod.

著者

Mary K. Wicksten

出版者

Carcinological Society of Japan

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.50, pp.103-106, 2021-09-16 (Released:2021-09-16)

参考文献数

15

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Three species of the sponge-dwelling lobster Eiconaxius are known from the eastern Pacific. Previous reports and descriptions were based on dead specimens. During a study by remotely operated vehicle, Eiconaxius baja was photographed in situ at the San Juan Seamount within a sponge of the family Phariidae. It tried to escape by swimming backward. Illuminated by the lights of the vehicle, the lobster had an orange color. The depth at which the lobster lives has no ambient light, so the function of the color remains uncertain.

著者

中谷 勇

出版者

日本甲殻類学会

雑誌

Crustacean Research (ISSN:02873478)

巻号頁・発行日

vol.25, pp.142-150, 1996

参考文献数

13

被引用文献数

4 3

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アメリカザリガニProcambarus clarkiiの鉗脚に種々の形の過剰再生体を誘発した.前節の一部を側方から神経幹の1本を切断するようにU-字型に切除すると,前節の基部側と先端側それぞれの傷面から不動持と同様の構造物が向かい合って形成された.この1対の構造物は,傷の幅が相対的に広いと互いに離れており,それぞれの鈎爪と鋸歯は向かい合って形成された.この1対の構造物は,傷の幅が狭いと基部付近で融合しているが先端の方では二つに分かれるか,または全長にわたって融合した.後者の場合は,それぞれの鋸歯は背側または腹側に並列に形成されたが,鈎爪は形成されないか,または,先端に1対の鈎爪が形成されたが,鋸歯は形成されないものもあった.過剰再生体に鈎爪も鋸歯も形成されない,単一の棘状の構造物も形成されたが,これは1対の過剰再生体がより密に融合したものと考えられる.傷口から2〜3対の融合した構造物が形成された個体もあった.