World's Best Scientists 2026 revealed!
Hiroshi Kajihara

Hiroshi Kajihara

D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Animal Science and Veterinary 26 2875 2604 33 32 215 3025

Hiroshi Kajihara publications per year

The chart shows the history of publications by Hiroshi Kajihara between 1960 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Hiroshi Kajihara published across 66 years, from 1960 to 2025, averaging 4.2 papers a year. Output peaked at 27 publications in 2019. 36 of the 280 publications appeared in the last two years.

No. of publications
5 10 15 20 25
Bar chart. Horizontal axis: year, 1960 to 2025. Vertical axis: number of publications, 0 to 27. Peak 27 publications in 2019. 1960: 1 publication 1961: 0 publications 1962: 0 publications 1963: 0 publications 1964: 1 publication 1965: 0 publications 1966: 0 publications 1967: 0 publications 1968: 0 publications 1969: 0 publications 1970: 0 publications 1971: 0 publications 1972: 0 publications 1973: 0 publications 1974: 0 publications 1975: 0 publications 1976: 0 publications 1977: 0 publications 1978: 0 publications 1979: 0 publications 1980: 0 publications 1981: 0 publications 1982: 0 publications 1983: 0 publications 1984: 0 publications 1985: 0 publications 1986: 0 publications 1987: 0 publications 1988: 0 publications 1989: 1 publication 1990: 0 publications 1991: 0 publications 1992: 0 publications 1993: 1 publication 1994: 0 publications 1995: 0 publications 1996: 0 publications 1997: 0 publications 1998: 2 publications 1999: 1 publication 2000: 2 publications 2001: 3 publications 2002: 6 publications 2003: 5 publications 2004: 2 publications 2005: 5 publications 2006: 3 publications 2007: 10 publications 2008: 5 publications 2009: 3 publications 2010: 6 publications 2011: 7 publications 2012: 10 publications 2013: 9 publications 2014: 8 publications 2015: 13 publications 2016: 10 publications 2017: 17 publications 2018: 16 publications 2019: 27 publications 2020: 22 publications 2021: 17 publications 2022: 14 publications 2023: 17 publications 2024: 21 publications 2025: 15 publications
1960 2025

280 publications in total across all disciplines

View publications per year as a table
Hiroshi Kajihara: publications per year, 1960 to 2025
Year Publications
1960 1
1961 0
1962 0
1963 0
1964 1
1965 0
1966 0
1967 0
1968 0
1969 0
1970 0
1971 0
1972 0
1973 0
1974 0
1975 0
1976 0
1977 0
1978 0
1979 0
1980 0
1981 0
1982 0
1983 0
1984 0
1985 0
1986 0
1987 0
1988 0
1989 1
1990 0
1991 0
1992 0
1993 1
1994 0
1995 0
1996 0
1997 0
1998 2
1999 1
2000 2
2001 3
2002 6
2003 5
2004 2
2005 5
2006 3
2007 10
2008 5
2009 3
2010 6
2011 7
2012 10
2013 9
2014 8
2015 13
2016 10
2017 17
2018 16
2019 27
2020 22
2021 17
2022 14
2023 17
2024 21
2025 15
Total 280
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Hiroshi Kajihara publication distribution in Animal Science and Veterinary in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Animal Science and Veterinary in 2026. The highlighted bar marks where Hiroshi Kajihara sits on this spectrum.

No. of scientists
25 50 75 100
Bar chart with 84 bars. Horizontal axis: publications, 29–33 to 442+. Vertical axis: number of scientists, 0 to 109. Most scientists, 109, have 119–123 publications. The last bar groups every scientist with 442 publications or more. The highlighted bar, 214–218 publications, is where this scientist sits. 29–33 publications: 1 scientist 34–38 publications: 6 scientists 39–43 publications: 17 scientists 44–48 publications: 23 scientists 49–53 publications: 28 scientists 54–58 publications: 44 scientists 59–63 publications: 66 scientists 64–68 publications: 75 scientists 69–73 publications: 71 scientists 74–78 publications: 85 scientists 79–83 publications: 108 scientists 84–88 publications: 105 scientists 89–93 publications: 84 scientists 94–98 publications: 103 scientists 99–103 publications: 97 scientists 104–108 publications: 95 scientists 109–113 publications: 89 scientists 114–118 publications: 88 scientists 119–123 publications: 109 scientists 124–128 publications: 93 scientists 129–133 publications: 89 scientists 134–138 publications: 95 scientists 139–143 publications: 92 scientists 144–148 publications: 80 scientists 149–153 publications: 75 scientists 154–158 publications: 74 scientists 159–163 publications: 67 scientists 164–168 publications: 53 scientists 169–173 publications: 62 scientists 174–178 publications: 63 scientists 179–183 publications: 50 scientists 184–188 publications: 55 scientists 189–193 publications: 50 scientists 194–198 publications: 27 scientists 199–203 publications: 44 scientists 204–208 publications: 31 scientists 209–213 publications: 28 scientists 214–218 publications: 38 scientists 219–223 publications: 33 scientists 224–228 publications: 36 scientists 229–233 publications: 29 scientists 234–238 publications: 35 scientists 239–243 publications: 23 scientists 244–248 publications: 24 scientists 249–253 publications: 29 scientists 254–258 publications: 28 scientists 259–263 publications: 21 scientists 264–268 publications: 25 scientists 269–273 publications: 11 scientists 274–278 publications: 18 scientists 279–283 publications: 13 scientists 284–288 publications: 18 scientists 289–293 publications: 10 scientists 294–298 publications: 12 scientists 299–303 publications: 11 scientists 304–308 publications: 15 scientists 309–313 publications: 14 scientists 314–318 publications: 14 scientists 319–323 publications: 8 scientists 324–328 publications: 8 scientists 329–333 publications: 13 scientists 334–338 publications: 14 scientists 339–343 publications: 13 scientists 344–348 publications: 10 scientists 349–353 publications: 11 scientists 354–358 publications: 5 scientists 359–363 publications: 8 scientists 364–368 publications: 8 scientists 369–373 publications: 6 scientists 374–378 publications: 7 scientists 379–383 publications: 8 scientists 384–388 publications: 3 scientists 389–393 publications: 4 scientists 394–398 publications: 5 scientists 399–403 publications: 8 scientists 404–408 publications: 5 scientists 409–413 publications: 4 scientists 414–418 publications: 3 scientists 419–423 publications: 8 scientists 424–428 publications: 5 scientists 429–433 publications: 3 scientists 434–438 publications: 5 scientists 439–441 publications: 5 scientists 442+ publications: 99 scientists
29–33 publications 442+

This scientist: 215 publications — 77th percentile

77% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 442 publications or more.

View publications distribution as a table
Number of Animal Science and Veterinary scientists by publication count, Research.com 2026 ranking edition. Based on 3,155 ranked scientists.
Publications Scientists This scientist
29–33 1
34–38 6
39–43 17
44–48 23
49–53 28
54–58 44
59–63 66
64–68 75
69–73 71
74–78 85
79–83 108
84–88 105
89–93 84
94–98 103
99–103 97
104–108 95
109–113 89
114–118 88
119–123 109
124–128 93
129–133 89
134–138 95
139–143 92
144–148 80
149–153 75
154–158 74
159–163 67
164–168 53
169–173 62
174–178 63
179–183 50
184–188 55
189–193 50
194–198 27
199–203 44
204–208 31
209–213 28
214–218 38 215
219–223 33
224–228 36
229–233 29
234–238 35
239–243 23
244–248 24
249–253 29
254–258 28
259–263 21
264–268 25
269–273 11
274–278 18
279–283 13
284–288 18
289–293 10
294–298 12
299–303 11
304–308 15
309–313 14
314–318 14
319–323 8
324–328 8
329–333 13
334–338 14
339–343 13
344–348 10
349–353 11
354–358 5
359–363 8
364–368 8
369–373 6
374–378 7
379–383 8
384–388 3
389–393 4
394–398 5
399–403 8
404–408 5
409–413 4
414–418 3
419–423 8
424–428 5
429–433 3
434–438 5
439–441 5
442+ 99
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Hiroshi Kajihara D-index placement in Animal Science and Veterinary in 2026

The chart shows the D-index (discipline H-index) distribution of Animal Science and Veterinary scientists ranked by Research.com in 2026. The highlighted bar marks where Hiroshi Kajihara sits on this spectrum.

No. of scientists
50 100 150
Bar chart with 58 bars. Horizontal axis: D-Index, 20 to 77+. Vertical axis: number of scientists, 0 to 158. Most scientists, 158, have 31 D-Index. The last bar groups every scientist with 77 D-Index or more. The highlighted bar, 26 D-Index, is where this scientist sits. 20 D-Index: 5 scientists 21 D-Index: 22 scientists 22 D-Index: 31 scientists 23 D-Index: 44 scientists 24 D-Index: 53 scientists 25 D-Index: 66 scientists 26 D-Index: 80 scientists 27 D-Index: 101 scientists 28 D-Index: 106 scientists 29 D-Index: 116 scientists 30 D-Index: 154 scientists 31 D-Index: 158 scientists 32 D-Index: 143 scientists 33 D-Index: 137 scientists 34 D-Index: 126 scientists 35 D-Index: 134 scientists 36 D-Index: 112 scientists 37 D-Index: 115 scientists 38 D-Index: 105 scientists 39 D-Index: 111 scientists 40 D-Index: 107 scientists 41 D-Index: 87 scientists 42 D-Index: 74 scientists 43 D-Index: 62 scientists 44 D-Index: 61 scientists 45 D-Index: 41 scientists 46 D-Index: 51 scientists 47 D-Index: 43 scientists 48 D-Index: 28 scientists 49 D-Index: 47 scientists 50 D-Index: 40 scientists 51 D-Index: 34 scientists 52 D-Index: 33 scientists 53 D-Index: 43 scientists 54 D-Index: 16 scientists 55 D-Index: 32 scientists 56 D-Index: 21 scientists 57 D-Index: 18 scientists 58 D-Index: 28 scientists 59 D-Index: 33 scientists 60 D-Index: 17 scientists 61 D-Index: 21 scientists 62 D-Index: 18 scientists 63 D-Index: 21 scientists 64 D-Index: 9 scientists 65 D-Index: 20 scientists 66 D-Index: 11 scientists 67 D-Index: 16 scientists 68 D-Index: 12 scientists 69 D-Index: 17 scientists 70 D-Index: 13 scientists 71 D-Index: 15 scientists 72 D-Index: 11 scientists 73 D-Index: 11 scientists 74 D-Index: 14 scientists 75 D-Index: 5 scientists 76 D-Index: 6 scientists 77+ D-Index: 100 scientists
20 D-Index 77+

This scientist: 26 D-Index — 10th percentile

10% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 77 D-Index or more.

View D-Index distribution as a table
Number of Animal Science and Veterinary scientists by D-index, Research.com 2026 ranking edition. Based on 3,155 ranked scientists.
D-Index Scientists This scientist
20 5
21 22
22 31
23 44
24 53
25 66
26 80 26
27 101
28 106
29 116
30 154
31 158
32 143
33 137
34 126
35 134
36 112
37 115
38 105
39 111
40 107
41 87
42 74
43 62
44 61
45 41
46 51
47 43
48 28
49 47
50 40
51 34
52 33
53 43
54 16
55 32
56 21
57 18
58 28
59 33
60 17
61 21
62 18
63 21
64 9
65 20
66 11
67 16
68 12
69 17
70 13
71 15
72 11
73 11
74 14
75 5
76 6
77+ 100
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Overview

Hiroshi Kajihara is affiliated with Hokkaido University in Japan, focusing on research primarily in Environmental Science and Earth and Planetary Sciences. Their work spans several interrelated subfields, including Ecology, Oceanography, Molecular Biology, Global and Planetary Change, and Plant Science.

The scientific contributions of Hiroshi Kajihara cover diverse topics such as Marine Biology and Ecology Research, Parasite Biology and Host Interactions, Marine Ecology and Invasive Species, Planarian Biology and Electrostimulation, Protist Diversity and Phylogeny, Microbial Community Ecology and Physiology, and Coral and Marine Ecosystems Studies.

Their recent notable papers include:

  • Higher classification of the Monostilifera (Nemertea: Hoplonemertea), 2021, Zootaxa
  • Lineid Heteronemerteans (Nemertea: Pilidiophora) from Sagami Bay, Japan, with Some Proposals for the Family-Level Classification System, 2021, ZOOLOGICAL SCIENCE
  • A molecular phylogeny of Tetrastemma and its allies (Nemertea, Monostilifera), 2021, Zoologica Scripta
  • Magnesium oxide induces immunity against Fusarium wilt by triggering the jasmonic acid signaling pathway in tomato, 2020, Journal of Biotechnology
  • Molecular Phylogenetic Analysis of Acotylea (Platyhelminthes: Polycladida), 2020, ZOOLOGICAL SCIENCE

Hiroshi Kajihara frequently collaborates with several researchers, including:

  • Natsumi Hookabe
  • Aoi Tsuyuki
  • Yuki Oya
  • Naoto Jimi
  • Jamael Abato

Their research is regularly published in several academic venues, with contributions in:

  • Species Diversity
  • ZOOLOGICAL SCIENCE
  • Zootaxa
  • Global Biodiversity Information Facility
  • Journal of Natural History

The scope of Hiroshi Kajihara's research involves extensive study of marine and terrestrial organisms, molecular phylogenies, and ecological interactions. The disciplines and topics covered indicate a broad expertise in environmental and biological sciences, particularly relating to marine ecosystems, biodiversity, and organismal classification.

Best Publications

  • Checklist of Nemertean Genera and Species Published between 1995 and 2007

    Hiroshi Kajihara;Alexei V. Chernyshev;Shi-Chun Sun;Per Sundberg

  • Statistical Parsimony Networks and Species Assemblages in Cephalotrichid Nemerteans (Nemertea)

    Haixia Chen;Malin Strand;Jon L. Norenburg;Shichun Sun

  • A transcriptomic approach to ribbon worm systematics (nemertea): resolving the pilidiophora problem

    Sónia C. S. Andrade;Horácio Montenegro;Malin Strand;Megan L. Schwartz

  • Immunoenzymatic visualization of tetrodotoxin (TTX) in Cephalothrix species (Nemertea: Anopla: Palaeonemertea: Cephalotrichidae) and Planocera reticulata (Platyhelminthes: Turbellaria: Polycladida: Planoceridae).

    Mohosena Begum Tanu;Yahia Mahmud;Osamu Arakawa;Tomohiro Takatani

  • A taxonomic catalogue of Japanese nemerteans (phylum Nemertea).

    Hiroshi Kajihara

  • Highly Toxic Ribbon Worm Cephalothrix simula Containing Tetrodotoxin in Hiroshima Bay, Hiroshima Prefecture, Japan

    Manabu Asakawa;Katsutoshi Ito;Hiroshi Kajihara

  • A new species of Nesotanais (Crustacea, Tanaidacea) from Japan, with a key to species and a note on male chelipeds

    Keiichi Kakui;Hiroshi Kajihara;Shunsuke F. Mawatari

  • Molecular systematics of Tanaidacea (Crustacea: Peracarida) based on 18S sequence data, with an amendment of suborder/superfamily-level classification.

    Keiichi Kakui;Toru Katoh;Shimpei F. Hiruta;Norio Kobayashi;Norio Kobayashi

  • Description of Pericelis flavomarginata sp. nov. (Polycladida: Cotylea) and its predatory behavior on a scaleworm.

    Aoi Tsuyuki;Yuki Oya;Naoto Jimi;Hiroshi Kajihara

  • A New Genus and Five New Species of Kalyptorhynchia (Platyhelminthes: Rhabdocoela) Discovered in Northern Japan

    Naoya Takeda;Hiroshi Kajihara

  • Morphological and molecular diversity of rissoellids (Mollusca, Gastropoda, Heterobranchia) from the Northwest Pacific island of Hokkaido, Japan.

    Luis E. Chira Siadén;Kevin C. Wakeman;Stephen C. Webb;Kazunori Hasegawa

  • A New Species of Phaenoplana (Platyhelminthes: Polycladida) from the Ogasawara Islands

    Yuki Oya;Hiroshi Kajihara

  • Molecular phylogeny of kinorhynchs.

    Hiroshi Yamasaki;Shimpei F. Hiruta;Hiroshi Kajihara

  • Paralytic toxicity in the ribbon worm Cephalothrix species (Nemertea) in Hiroshima Bay, Hiroshima Prefecture, Japan and the isolation of tetrodotoxin as a main component of its toxins.

    Manabu Asakawa;Tadayoshi Toyoshima;Katsutoshi Ito;Kentaro Bessho

  • Species Diversity of Animals in Japan

    Masaharu Motokawa;Hiroshi Kajihara

  • A New Brackish-water Species of Echinoderes (Kinorhyncha: Cyclorhagida) from the Seto Inland Sea, Japan

    Hiroshi Yamasaki;Hiroshi Kajihara

  • Redescription of Cerebratulus marginatus auct. (Nemertea: Pilidiophora) from Hokkaido, Japan, as a new species.

    Hiroshi Kajihara

  • New taxa of Japanese and New Zealand Eurystomellidae (Phylum Bryozoa) and their phylogenetic relationships

    Dennis P. Gordon;Shunsuke F. Mawatari;Hiroshi Kajihara

  • Character-matrix based descriptions of two new nemertean (Nemertea) species

    Per Sundberg;Alexey. V. Chernyshev;Hiroshi Kajihara;Tobias Kånneby

  • Taxonomy and phylogeny of Lineus torquatus and allies (Nemertea, Lineidae) with descriptions of a new genus and a new cryptic species

    Alexei V. Chernyshev;Neonila E. Polyakova;Sergei V. Turanov;Hiroshi Kajihara

  • Molecular Phylogeny of Cypridoid Freshwater Ostracods (Crustacea: Ostracoda), Inferred from 18S and 28S rDNA Sequences

    Shimpei F. Hiruta;Norio Kobayashi;Toru Katoh;Hiroshi Kajihara

  • Cosmopolitan or Cryptic Species? A Case Study of Capitella teleta (Annelida: Capitellidae).

    Shinri Tomioka;Tomohiko Kondoh;Waka Sato-Okoshi;Katsutoshi Ito

  • Two Kinorhynch Species (Cyclorhagida, Echinoderidae, Echinoderes) Show Different Distribution Patterns Across Tsugaru Strait, Northern Japan

    Hiroshi Yamasaki;Shimpei F. Hiruta;Hiroshi Kajihara;Matthew H. Dick

  • Description of a new Notocomplana species (Platyhelminthes: Acotylea), new combination and new records of Polycladida from the northeastern Sea of Japan, with a comparison of two different barcoding markers

    Yuki Oya;Hiroshi Kajihara

  • Nemertean taxonomy-Implementing changes in the higher ranks, dismissing Anopla and Enopla

    Malin Strand;Jon Norenburg;José E. Alfaya;Fernando Ángel Fernández-Álvarez

  • The future of nemertean taxonomy (phylum Nemertea) — a proposal

    Per Sundberg;Sónia C. S. Andrade;Thomas Bartolomaeus;Patrick Beckers

Frequent Co-Authors

Per Sundberg
Per Sundberg University of Gothenburg
Tamao Noguchi
Tamao Noguchi Nagasaki University
Gonzalo Giribet
Gonzalo Giribet Harvard University
Martin Thiel
Martin Thiel Catholic University of the North
Dennis P. Gordon
Dennis P. Gordon National Institute of Water and Atmospheric Research
Atsushi Yamaguchi
Atsushi Yamaguchi Tohoku University
Toru Miura
Toru Miura University of Tokyo
Annie Machordom
Annie Machordom Spanish National Research Council
Satoshi Tadokoro
Satoshi Tadokoro Tohoku University
Maria Byrne
Maria Byrne University of Sydney

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