Eijiroh Nishi

Yokohama National University · College of Education and Human Sciences

Euchonoides is a genus of small sabellid worms composed of two valid species, E. moeone from Hawaii and E. bicincta from Kamchatka and Kurile Islands. We report here a third species from sandy mud sediments in Suruga Bay, Japan. Euchonoides shizuoka sp. nov. is characterized by several unique, distinctive features as follows: a laterally notched co...

Open access https://repository.kulib.kyoto-u.ac.jp/dspace/handle/2433/288030

We describe here a new species of Amphictene (Annelida, Polychaeta, Pectinariidae) from a depth of 1160 m off Kushiro, East Hokkaido, Japan. Amphictene hokkaido sp. nov. is characterized by the presence of following characters: a pair of ventral lappets in segment 1; ventro-median lobes in segments 2–4; anterior conical or rounded lappets on ventro...

A new species of Spirobranchus (Annelida: Serpulidae) is described based on specimens collected at the coastal Shonan area of Sagami Bay and the adjacent areas of Honshu, Japan. Spirobranchus akitsushima sp. nov. forms large aggregations in the intertidal rocky zone of warm-temperate Japanese shores. This species was referred to as Pomatoleios krau...

Phyllochaetopterus (Annelida: Chaetopteridae) is a diverse genus of tube-dwelling polychaetes found in a wide range of marine environments from subtidal to abyssal depths, including chemosynthesis-based ecosystems. The Shinkai Seep Field (SSF) is a serpentinite-hosted system in the Mariana Trench, where the deepest-known Phyllochaetopterus polychae...

A new species of the sabellid polychaete genus Claviramus Fitzhugh, 2002, is described from Ariake Inland Sea, Kyushu, Japan. Claviramus is a small genus, composed of three species worldwide. Its distinctive feature is the presence of foliaceous flanges at the distal ends of the radioles. Claviramus kyushuensissp. nov. here described is characteriz...

Lygdamis wirtzi recorded at Ascension and St Helena Islands.

Distribution of dragonfly larvae in Yokohama municipal school-pools and development as study materials

Insects chirping as study materials

DNA barcoding is an effective method of accurately identifying morphologically similar oyster species. However, for some of Japan’s Ostrea species there are no molecular data in the international DNA databases. We sequenced the mitochondrial large subunit ribosomal DNA (LSrDNA) and cytochrome c oxidase subunit I (COI) gene of five known and two uni...

Acromegalomma, nomen novum, is introduced as a replacement name for the polychaete genus Megalomma Johansson, 1926 (Annelida, Sabellidae), preoccupied by Megalomma Westwood, 1842 (Insecta, Coleoptera, Carabidae). The historical background of the homonymy and a full list with 36 new combinations in the new genus are included, while two species are c...

The polychaete Notaulax yamasui sp. n. (Sabellidae) is described from Okinawa and Ogasawara, south Japan, where it was found living embedded in a dead skeleton of the coral Porites sp. The new species is characterized by the presence of a pigmented sub-distal swelling on the tips of the crown radioles, a unique feature among species of the genus. B...

Phylogenetic relationships within Chaetopteridae were assessed using parsimony cladistic analysis of 43 external morphological characters and molecular phylogenetic analysis of three genes: mitochondrial cytochrome oxidase subunit I DNA (COI) and nuclear 28S and 18S ribosomal DNA. The group currently comprises four accepted genera: Chaetopterus Cuv...

A new species of the genus Sabellaria Lamarck, 1818 (Annelida: Polychaeta: Sabellariidae) is described from the intertidal zone of Jeram, Selangor, Malaysia. Sabellaria jeramae n. sp. is a gregarious species that constructs large reefs several hundreds of meters long and 50–200 m wide. The new species is distinguished from other congeners by the ch...

The ecology of tropical sabellariid reefs is scarcely known, and only few records of such systems were reported from Southeast Asia. The present investigation describes the only documented polychaete reef of western Peninsular Malaysia, which has been previously reported on in two other studies. More recent surveys documented dramatic temporal chan...

Eight species of Pectinariidae de Quatrefages, 1866 were recorded from Japan and adjacent waters. We studied four species of the family and redescribe the poorly known species from the Seto Inland Sea and Ariake Sound, Kyushu based on recently collected material. The species covered in this study are Amphictene japonica (Nilsson, 1928), Lagis bocki...

[This corrects the article DOI: 10.3897/zookeys.422.7501.].

Two undescribed species of polychaetes in Mediomastus (Annelida: Capitellidae) were collected from intertidal to shallow habitats in Tokyo Bay, Japan. These are M. duobalteus sp. n. and M. hanedaensis sp. n. Mediomastus duobalteus sp. n. is distinguishable from all congeners by the following characters: 1) segments 3, 4, 8–11 stainable with methyl...

Recent records of the occurrence of a little-known ribbon worm, Nipponnemertes ogumai (Yamaoka 1947), along the Pacific coast of Honshu, Japan, are summarized with a map of known distribution. Photographs of the worm in its living state are provided, with brief descriptions of external morphology and behavior. Sequences of the nuclear 18S rDNA (1,7...

A new species of the pea crab genus Pinnixa White, 1846 (Pinnotheridae), P. banzu n. sp., is described and illustrated on the basis of four specimens from Banzu, an estuary of the Obitsu River, Kisarazu, Chiba Prefecture, Japan. All the specimens examined were associated with the polychaete tube worm Chaetopterus cautus Marenzeller, 1879 (Chaetopte...

Abstract. A terebellid polychaete Nicolea sinensis Fauvel, 1932 was first recorded from shallow water off Haneda, Tokyo Bay. It is characterized by having dichotomously branched brancha, 4 pairs of genital papillae on 6 to 9th thoracic setigers, two rows of teeth above main fang of thoracic uncini.

Morphological Analysis of Cicada-exuviae, with Special Reference to Six Species of Cicadidae in the Suburb in Kanagawa Prefecture

Phyllochaetopterus gigas, new species, was found living associ-ated with a whale fall lying at 2892 meters depth in the Monterey Submarine Canyon, off California, U.S.A. The new species was found over a period of nine yr adjacent to, on, or in sediment lying over, the baleen of the whale fall. Phyllochaetopterus gigas is characterized by its large...

Abstract.—Phyllochaetopterus gigas, new species, was found living associ- ated with a whale fall lying at 2892 meters depth in the Monterey Submarine Canyon, off California, U.S.A. The new species was found over a period of nine yr adjacent to, on, or in sediment lying over, the baleen of the whale fall. Phyllochaetopterus gigas is characterized by...

Abstract: The present status and problems of threatened benthic animals in the tidal flats of Japan are discussed. These issues came to light during the editing process of “Threatened Animals of Japanese Tidal Flats: Red Data Book （RDB） of Seashore Benthos ”（Japanese Association of Benthology, 2012）. In this book, 651 species （462 molluscs, 138 art...

The present status and problems of threatened benthic animals in the tidal flats of Japan are discussed. These issues came to light during the editing process of “Threatened Animals of Japanese Tidal Flats: Red Data Book (RDB) of Seashore Benthos ” (Japanese Association of Benthology, 2012). In this book, 651 species (462 molluscs, 138 arthropods,...

The heteronemertean Euborlasia nigrocincta Coe, 1940 was previously known exclusively from the eastern Pacific. A specimen collected on the Izu Peninsula, Honshu, Japan, herein identified as E. nigrocincta, represents the first record of the species from the western Pacific, increasing the western extent of the species' known range by more than 830...

Fan worms (Sabellidae: Polychaeta) are known to inhabit deep-sea environments and some species have been reported from hydrothermal vents. However, this is the first record of a Bispira species from this environment. The specimens identified as Bispira wireni were collected at the I-Aena Hole, Okinawa Trough, Japan. We describe the specimens from t...

This study is a revision of the poorly known genus Pseudochitinopoma Zibrowius, 1969 (Annelida, Serpulidae), erected for Hyalopomatopsis occidentalis Bush, 1905 from the West Coast of North America. Subsequently, an unnamed Pseudochitinopoma sp. nov. from the Seychelles (ten Hove 1994) (described herein as P. amirantensis sp. nov.) and P. pavimenta...

Abstract. The nereidid polychaete Leonnates persicus Wesenberg-Lund originally described from the Percian Gulf is currently known from the Indian Ocean and Western Pacific Oceans. In Japanese waters, it was recorded from the Ariake Sound and Kagoshima, Kyushu, Tokushima, Hyogo, and Mikawa Bay. Here we report a new record of this species from shallo...

The poorly-known serpulid Nogrobs grimaldii was originally described based on specimens collected from off Azores at depths of 1846–1900 m. Its adults are characterized by thick pinnulated opercular peduncle and unusual free (unattached) quadrangular tube coiled into a flat spiral. Here we review and re-identify published material and report new re...

A new polychaete, Pileolaria aurita new species, of the family Spirorbidae from the Pacific coast of Honshu, Japan is described. This species clearly differs from all other species of Pileolaria Claparède, 1868 in the morphology of the brood chamber, which bears distally two cone-shaped projections resembling cat ears. Besides, it is the only speci...

Previously unreported males of a gnathiid isopod were found in reproductive aggregations of the harem-forming gnathiid Elaphognathia discolor. Although the male gnathiids were small in size and morphologically different from E. discolor males, the male sexual organ, appendix masculina, was similar to that of E. discolor males, and possible conspeci...

The diversity of bathyal and abyssal marine organisms is still poorly known and this is especially true for tubicolous polychaetes of the family Serpulidae, the common inhabitants of subtidal and shelf locations. We report herein new records of poorly known deep-sea (mostly below 2000 m) serpulids collected in the Pacific Ocean by early Soviet Ocea...

A set of polychaete specimens, collected and studied by Professor Akira Izuka from 1880s to 1910s (Meiji to Taisho Era), was discovered in The University Museum, The University of Tokyo,Japan. A total of 157 lots, including 71 species from 26 families, were found in the collection. Twenty-seven lots were judged as the type material of the following...

A new species of the genus Sabellaria Lamarck, 1812, is described from shallow waters off Onjuku, the Pacific side of Boso Peninsula, Chiba, Japan. Sabellaria isumiensis n. sp. is a gregarious species building colonies of tubes made of sand and shell debris over 2 m wide in the intertidal to subtidal zone of the rocky shores. The new species is dis...

A collection of Serpulidae (Annelida, Polychaeta) from the Patton-Murray Seamounts, Gulf of Alaska, USA contained three species Apomatus voightae n. sp., Bathyvermilia eliasoni n. comb., and Hyalopomatus biformis (Hartman, 1960). Apomatus voightae n. sp. differed from all other Apomatus spp. and from all known serpulid species by very unusual flat...

Serpulidae are sessile suspension-feeding annelids commonly found in the periphery of hydrothermal vents, but up to now only two species, Laminatubus alvini and Protis hydrothermica had been described from such communities. This paper reports two additional serpulid species, collected in 2005 from the North Fiji hydrothermal vent area, identified a...

Phyllochaetopterus polus, a new species of the polychaete family Chaetopteridae is described. Specimens were collected at the Ashadze-1 vent field (Mid-Atlantic Ridge), from 4 100-4200 m depth. P polus is the first chaetopterid reported from the Atlantic hydrothermal vents. Three chaetopterid species have been recorded from deep-sea hydrothermal ve...

We report here the polychaete fauna around Haneda and the estuary of Tamagawa River. This study is based on the environmental assessment of Haneda Airport re-expansion project conducted in 2006 and 2007. In total, 100 species of polychaetes were found. In estuaries the dominant species were Hediste diadroma, Prionospio japonica, and an unidentified...

The genus Chone KrØyer, 1856, and related genera of the family Sabellidae (Polychaeta) are common members of softbottom communities. Four new species from Japanese waters are described herein: Dialychone okudai n. sp., from Hokkaido, Paradialychone katsuuraensis n. sp., from Katsuura, Boso Peninsula; P. edomae n. sp., from Tokyo Bay and Jasmineira...

We provide descriptions of five species of Chaetopterus and two species of Mesochaetopterus (Annelida: Polychaeta: Chaetopteridae) based on collections during 2001–2007 and observations from the Galapagos Islands, Ecuador. Chaetopterus galapagensis sp. nov. is a large (ca. 18 cm long) worm that inhabits a U-shaped tube in soft sand substrates. It i...

Calcareous tube polychaetes (family Serpulidae) are notorious biofoulers that are easily transported and introduced to allochthonous habitats. Here we report the recent introduction of Hydroides dianthus (Verrill, 1873) to eastern Japan as its first occurrence in East Asia, probably from European or American coasts. Specimens had been found on arti...

Eijiroh Nishi and Hwey-Lian Hsieh (2009) Chaetopterid polychaetes from Taiwan and Okinawa Island (Japan), with descriptions of two new species. Zoological Studies 48(3): 370-379. Chaetopterid polychaetes (Annelida: Spionida) were studied in shallow-water sandy and muddy areas of Taiwan and Okinawa I., Japan. We found 4 species of the family, Mesoch...