Resurrection and redescription of Squalus suckleyi (Girard, 1854) from the North Pacific, with comments on the Squalus acanthias subgroup (Squaliformes: Squalidae)

A taxonomic re-evaluation of the status of the North Pacific Squalus suckleyi (Girard, 1854) combining the use of meristic, morphological and molecular data reveal this species to be clearly distinct from the widespread Squalus acanthias (Linneaus, 1758). Differences in the external morphology between S. acanthias and S. suckleyi are subtle and are likely to be masked by intraspecific variation within individuals. However, we found S. suckleyi to differ from S. acanthias based on the following morphological and meristic characteristics: a short, broadly-rounded to acute snout; first dorsal-fin midpoint more posterior to pectoral-fin insertion; pelvic-fin origin closer to second dorsal fin than first dorsal fin; total vertebral counts average 99 (97–106). Molecular analysis of approximately 650 bp of the CO1 mitochondrial gene (DNA barcode region) showed separation of S. suckleyi and S. acanthias into two distinct genetic clades with 98% bootstrap support. Within species genetic diversities were 0.109±0.036% and 0.176±0.041% for S. suckleyi and S. acanthias respectively; between species diversity was 5– 6 fold greater at 0.765+0.307%. Squalus suckleyi is thus resurrected and a neotype for this endemic North Pacific Squalus species is designated.

Download Full-text

Three new species of the genus Dendronotus from Japan and Russia (Mollusca, Nudibranchia)

Zootaxa ◽

10.11646/zootaxa.4747.3.4 ◽

2020 ◽

Vol 4747 (3) ◽

pp. 495-513

Author(s):

ALEXANDER MARTYNOV ◽

YOSHIHIRO FUJIWARA ◽

SHINJI TSUCHIDA ◽

NADEZHDA SANAMYAN ◽

KAREN SANAMYAN ◽

...

Keyword(s):

New Species ◽

North Pacific ◽

Molecular Data ◽

The North ◽

Pacific Waters ◽

Morphological And Molecular Data ◽

Three New Species ◽

First Time ◽

Japanese Islands ◽

The North Pacific

Three new species of the genus Dendronotus are described from the North Pacific waters of Japan and Russia. For the first time since 1949, three new species, D. jamsteci sp. nov., D. zakuro sp. nov. and D. bathyvela sp. nov. are described from the waters of the Japanese Islands. D. zakuro sp. nov. was also discovered in the waters of Russia (Kamchatka). The descriptions of the new species D. jamsteci sp. nov. and D. zakuro sp. nov. are based on morphological and molecular data; D. bathyvela sp. nov. morphologically belongs to the group of D. robustus, D. velifer and D. patricki. This study revises our knowledge of North Pacific species of the genus Dendronotus, considerably expands the number of species worldwide and contributes to the multilevel fine-scale diversity concept.

Download Full-text

LAMPRITREMA NIPPONICUM YAMAGUTI (TREMATODA) FROM NEW HOSTS IN THE NORTH PACIFIC OCEAN, THE RELATIONSHIP OF DISTOMUM MIESCHERI ZSCHOKKE, AND THE STATUS OF THE FAMILY LAMPRITREMATIDAE

Canadian Journal of Zoology ◽

10.1139/z62-083 ◽

1962 ◽

Vol 40 (5) ◽

pp. 941-950

Author(s):

L. Margolis

Keyword(s):

North Pacific ◽

North Pacific Ocean ◽

Oncorhynchus Gorbuscha ◽

The North ◽

The Family ◽

The Status ◽

New Hosts ◽

Relationship Of ◽

The Relationship ◽

The North Pacific

Lampritrema nipponicum is recorded from three new hosts in the North Pacific: Brama rayi (Bloch), Oncorhynchus nerka (Walbaum), and Oncorhynchus gorbuscha (Walbaum). Only immature specimens were found in the last two (evidently accidental) hosts. Distomum miescheri Zschokke is transferred to Lampritrema, becoming Lampritrema miescheri (Zschokke) nov. comb. This species possibly is identical with L. nipponicum. Lampritrematidae is considered a valid family, distinct from Hemiuridae sensu lato.

Download Full-text

The Status, Ecology, and Conservation of Marine Birds of the North Pacific

Colonial Waterbirds ◽

10.2307/1521847 ◽

1996 ◽

Vol 19 (1) ◽

pp. 160

Author(s):

K. Vermeer ◽

K. T. Briggs ◽

K. H. Morgan ◽

D. Siegel-Causey

Keyword(s):

North Pacific ◽

Marine Birds ◽

The North ◽

The Status ◽

The North Pacific

Download Full-text

The genus Anonyx (Crustacea, Amphipoda) in the North Pacific and Arctic oceans: Anonyx nugax group

Canadian Journal of Zoology ◽

10.1139/z82-228 ◽

1982 ◽

Vol 60 (7) ◽

pp. 1754-1775 ◽

Cited By ~ 3

Author(s):

D. H. Steele

Keyword(s):

New Species ◽

Arctic Ocean ◽

North Pacific ◽

The Other ◽

Pacific Region ◽

The North ◽

Two New Species ◽

The Status ◽

North Pacific Region ◽

The North Pacific

Thirteen species of the Anonyx nugax group (uropod 2 partially constricted) are listed for the North Pacific and adjacent Arctic ocean. Two new species, Anonyx beringi and Anonyx barrowensis are described; A. pacificus Gurjanova, A. anivae Gurjanova, A. comecrudus Barnard, and A. epistomicus Kudrjaschov are redescribed; and the status of the other species is reconsidered and commented upon. Only four of these species, nugax, sarsi, lilljeborgi, and debruyni, have circumpolar distributions, with the other nine confined to the North Pacific region or to it and adjacent seas.

Download Full-text

Revision of the Alitta virens species complex (Annelida: Nereididae) from the North Pacific Ocean

Zootaxa ◽

10.11646/zootaxa.4483.2.1 ◽

2018 ◽

Vol 4483 (2) ◽

pp. 201 ◽

Cited By ~ 2

Author(s):

TULIO F. VILLALOBOS-GUERRERO ◽

TORKILD BAKKEN

Keyword(s):

Pacific Ocean ◽

North Pacific ◽

Species Complex ◽

North Pacific Ocean ◽

Valid Species ◽

Distinctive Features ◽

The North ◽

The Status ◽

First Time ◽

The North Pacific

Alitta virens species complex encompasses elongate nereidids appreciated commercially both in the fishing and aquaculture industries. This complex has been well studied in biological and ecological terms. Nevertheless, detailed taxonomic analyses have scarcely been addressed, to the extent that only a few species in the complex have been recognized as valid but with some difficulties: Alitta brandti Malmgren, 1865 (Sea of Okhotsk), A. grandis (Stimpson, 1853) (northeastern USA) and A. virens (Sars, 1835) (Norway). Whereas, other several species have typically been regarded as synonyms, including those originally described from the North Pacific Ocean: Nereis (Alitta) virens plenidentata Moore, 1909 (California, USA), Nereis dyamusi Izuka, 1912 (Japan) and Nereis foliata Baird, 1863 (Vancouver, Canada). In this study, an examination of the immature and epitoke type and non-type material available for the A. virens species complex from the North Pacific was carried out. Herein, the status of A. brandti as a valid species is reinforced being clearly distinct from A. virens and related species. Alitta dyamusi n. comb., A. plenidentata n. comb. and A. williami nom. nov. are reinstated and transferred to Alitta, the specific epithet of the latter species is a replacement name for Nereis foliata Baird, 1863, which is a junior, primary homonym of Nereis foliata Dalyell, 1853. Lectotypes for A. plenidentata n. comb. and A. williami nom. nov. are designated. The North Pacific species of the A. virens complex, excluding A. plenidentata n. comb. which has several distinctive features that differ from all the Alitta species, are characterized by having homogomph spinigers in both supracicular and subacicular neurochaetae, oral ring with a larger number of rows and paragnaths, and epitoke males with unmetamorphosed pygidium and epitoke-modified chaetae in both neuropodial fascicles. The morphology of epitoke females in the A. virens complex is described for the first time. Identification keys to atoke and epitoke species of this complex are also provided.

Download Full-text

Rhinoraja longi, a new species of skate from the outer Aleutian Islands, with comments on the status of Rhinoraja (Chondrichthyes, Rajoidei)

Canadian Journal of Zoology ◽

10.1139/z91-262 ◽

1991 ◽

Vol 69 (7) ◽

pp. 1889-1903 ◽

Cited By ~ 4

Author(s):

W. Raschi ◽

J. D. McEachran

Keyword(s):

New Species ◽

North Pacific ◽

Aleutian Islands ◽

Skeletal Structure ◽

Crown Height ◽

The North ◽

The Status ◽

Dermal Denticle ◽

The North Pacific ◽

A New Species

Discovery of a new species of skate, Rhinoraja longi, from the outer Aleutian Islands led to a re-evaluation of the status and species composition of this genus. Rhinoraja is presently distinguished from Bathyraja primarily by its basally segmented rostral shaft and slightly longer tail. The genus contains five species plus the new species, and is endemic to the North Pacific arc, from Hokkaido, Japan, to the Aleutian Islands. The six species are very similar in morphology, meristics, and skeletal structure but differ substantially from each other in dermal denticle characters. Salient features of systematic significance in the dermal skeleton include the density and the relative proportions of total height, base height, and crown height of the denticles. The number and distribution of normal and alar thorns are also important.

Download Full-text

Deep-sea Ophiuroidea (Echinodermata) from the Danish Galathea II Expedition, 1950–52, with taxonomic revisions

Zootaxa ◽

10.11646/zootaxa.4963.3.6 ◽

2021 ◽

Vol 4963 (3) ◽

pp. 505-529

Author(s):

SABINE STÖHR ◽

TIMOTHY D. O’HARA

Keyword(s):

North Pacific ◽

Deep Sea ◽

Type Species ◽

Species Complex ◽

Molecular Data ◽

Central Pacific ◽

Species Limits ◽

The North ◽

Pacific Population ◽

The North Pacific

The brittle star samples collected by the Danish cruise ‘Galathea II’ (1950–52) had not been studied completely. We examined the remaining deep-sea samples (>400 m) and present the species inventory, discussing taxonomic issues in relation to recent phylogenetic data. About 235 samples were examined, over 9,300 individuals, from 67 species and 74 sampling localities, at depths of 425–5340 m. The species complex Amphiophiura bullata (Thomson, 1877) is morphologically not well separated, but molecular data suggest at least two clades. We propose to apply A. bullata for Atlantic and Australian populations and A. convexa (Lyman, 1878) for the North Pacific clade. We consider A. bullata pacifica Litvinova, 1971 conspecific with A. convexa. Ophiuroglypha irrorata (Lyman, 1878) and its subspecies are a polyphyletic group with unclear morphological boundaries. We propose to transfer Ophiura ossiculata (Koehler, 1908), Ophiura plana (Lütken & Mortensen, 1899) and Ophiura scomba Paterson, 1985 to Ophiuroglypha. Silax Fell, 1962, until now synonymised with Amphioplus Verrill, 1899, is proposed as a valid genus with the species S. verrilli (Lyman, 1879), S. consors (Koehler, 1908), S. daleus (Lyman, 1879), S. patulus (Lyman, 1879) and S. magnificus (Koehler, 1907). Triplodia Turner & Hallen, 2011 (a replacement name for Triodia A. M. Clark, 1970, due to homonymy) is synonymised with Silax, and possible specimens of its type species Triodia abdita A. M. Clark, 1970 are analysed. The species limits of Ophiacantha cosmica Lyman, 1879 and Ophiacantha pacifica Lütken & Mortensen, 1899 could not be confirmed morphologically, but published molecular data suggest two clades. We propose to apply O. pacifica to the Northern/Central Pacific population and O. cosmica to the Southern Pacific/Antarctic population.

Download Full-text

A NEW SPECIES OF LECITHOPHYLLUM FROM NORTH PACIFIC FISHES WITH A CONSIDERATION OF THE TAXONOMY OF THE GENERA LECITHOPHYLLUM, APONURUS, AND BRACHADENA (TREMATODA: HEMIURIDAE)

Canadian Journal of Zoology ◽

10.1139/z58-077 ◽

1958 ◽

Vol 36 (6) ◽

pp. 893-904 ◽

Cited By ~ 5

Author(s):

L. Margolis

Keyword(s):

British Columbia ◽

New Species ◽

North Pacific ◽

Oncorhynchus Nerka ◽

Merluccius Productus ◽

The North ◽

The Status ◽

The North Pacific ◽

A New Species

Lecithophyllum anteroporum n. sp. is described from Merluccius productus from British Columbia waters. Other hosts in the North Pacific are Oncorhynchus nerka and O. gorbuscha. The status of the genera Lecithophyllum Odhner, Aponurus Looss, and Brachadena Linton, and allocation of species within these genera are discussed. Keys to separate the three genera and the four species of Lecithophyllum are presented. Aponurus intermedius Manter is transferred to Lecithophyllum with L. fuscum Yamaguti as a synonym.

Download Full-text