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  1. The medaka (Oryzias latipes) egg envelope (chorion) is composed of three major glycoproteins, Zona Interna (ZI)-1, -2, and -3, that originate in the spawning female liver as the precursor proteins Choriogenin (Ch...

    Authors: Devun S. Birk, Shinji Onose, Masato Kinoshita and Kenji Murata
    Citation: Zoological Letters 2022 8:11
    Content type: Research article Published on:

  2. Generally, successful testis transplantation has been considered to require immune suppression in the recipient to avoid rejection of the transplanted tissue. In the present study, we demonstrate in medaka tha...

    Authors: Daichi Kayo, Shinji Kanda and Kataaki Okubo
    Citation: Zoological Letters 2022 8:10
    Content type: Research article Published on:

  3. The current distributions of organisms have been shaped by both current and past geographical barriers. However, it remains unclear how past geographical factors—currently cryptic on the sea floor—affected the...

    Authors: Jun J. Sato and Kouki Yasuda
    Citation: Zoological Letters 2022 8:9
    Content type: Research article Published on:

  4. Photoperiodic responses are observed in many organisms living in the temperate zones. The circadian clock is involved in photoperiodic time measurement; however, the underlying molecular mechanism for detectio...

    Authors: Marika Nakagawa, Keiko Okano, Yuya Saratani, Yosuke Shoji and Toshiyuki Okano
    Citation: Zoological Letters 2022 8:8
    Content type: Research article Published on:

  5. Venom production has evolved independently many times in the animal kingdom, although it is rare among mammals. Venomous shrews produce toxins in their salivary glands and use their venoms to hunt and store pr...

    Authors: Krzysztof Kowalski, Paweł Marciniak and Leszek Rychlik
    Citation: Zoological Letters 2022 8:7
    Content type: Research article Published on:

  6. Urodele amphibians, Pleurodeles waltl and Ambystoma mexicanum, have organ-level regeneration capability, such as limb regeneration. Multipotent cells are induced by an endogenous mechanism in amphibian limb regen...

    Authors: Akira Satoh, Rena Kashimoto, Ayaka Ohashi, Saya Furukawa, Sakiya Yamamoto, Takeshi Inoue, Toshinori Hayashi and Kiyokazu Agata
    Citation: Zoological Letters 2022 8:6
    Content type: Research article Published on:

  7. Fish possess one olfactory organ called the olfactory epithelium (OE), by which various chemical substances are detected. On the other hand, tetrapods possess two independent olfactory organs called the main o...

    Authors: Atsuhiro Sakuma, Zicong Zhang, Eri Suzuki, Tatsuki Nagasawa and Masato Nikaido
    Citation: Zoological Letters 2022 8:5
    Content type: Research article Published on:

  8. For corals, metamorphosis from planktonic larvae to sedentary polyps is an important life event, as it determines the environment in which they live for a lifetime. Although previous studies on the reef-buildi...

    Authors: Yuu Ishii, Masayuki Hatta, Ryusaku Deguchi, Masakado Kawata and Shinichiro Maruyama
    Citation: Zoological Letters 2022 8:4
    Content type: Research article Published on:

  9. Recent phylogenomic studies have revealed a robust, new hypothesis of annelid phylogeny. Most surprisingly, a few early branching lineages formed a basal grade, whereas the majority of taxa were categorized as...

    Authors: Günter Purschke, Stepan Vodopyanov, Anjilie Baller, Tim von Palubitzki, Thomas Bartolomaeus and Patrick Beckers
    Citation: Zoological Letters 2022 8:3
    Content type: Research article Published on:

  10. Social insect colonies constantly produce dead insects, which cause sanitary problems and potentially foster deadly pathogens and parasites. Hence, many social insects have evolved a variety of hygienic behavi...

    Authors: Harunobu Shibao, Mayako Kutsukake, Shigeru Matsuyama and Takema Fukatsu
    Citation: Zoological Letters 2022 8:2
    Content type: Research article Published on:

  11. Egg envelopes (chorions) in medaka, Oryzias latipes, are composed of three major glycoproteins: ZI-1, − 2, and − 3. These gene-encoded chorion glycoproteins are expressed in the liver and/or ovarian oocytes of se...

    Authors: Kenji Murata and Masato Kinoshita
    Citation: Zoological Letters 2022 8:1
    Content type: Research article Published on:

  12. The left-sided position of the mouth in amphioxus larvae has fascinated researchers for a long time. Despite the fundamental importance of mouth development in the amphioxus, the molecular regulation of its de...

    Authors: Guangwei Hu, Guang Li and Yiquan Wang
    Citation: Zoological Letters 2021 7:16
    Content type: Research article Published on:

  13. Although paedomorphosis is widespread across salamander families, only two species have ever been documented to exhibit paedomorphosis in Hynobiidae. One of these two exceptional species is Hynobius retardatus in...

    Authors: Hisanori Okamiya, Ryohei Sugime, Chiharu Furusawa, Yoshihiro Inoue and Osamu Kishida
    Citation: Zoological Letters 2021 7:14
    Content type: Research article Published on:

  14. The Oweniidae are marine annelids with many unusual features of organ system, development, morphology, and ultrastructure. Together with magelonids, oweniids have been placed within the Palaeoannelida, a siste...

    Authors: Elena Temereva, Nadezhda Rimskaya-Korsakova and Vyacheslav Dyachuk
    Citation: Zoological Letters 2021 7:15
    Content type: Research article Published on:

  15. There are two predominant sources of taxonomically useful morphological variability in the diverse tardigrade family Echiniscidae: the internal structure and surface sculpture of the cuticular plates covering ...

    Authors: Piotr Gąsiorek, Katarzyna Vončina, Diane R. Nelson and Łukasz Michalczyk
    Citation: Zoological Letters 2021 7:13
    Content type: Research article Published on:

  16. Symmetry in the arrangement of body parts is a distinctive phylogenetic feature of animals. Cnidarians show both bilateral and radial symmetries in their internal organs, such as gastric pouches and muscles. H...

    Authors: Safiye E. Sarper, Tamami Hirai, Take Matsuyama, Shigeru Kuratani and Koichi Fujimoto
    Citation: Zoological Letters 2021 7:12
    Content type: Research article Published on:

  17. Protein-based materials are considered versatile biomaterials, and their biodegradability is an advantage for sustainable development. Bagworm produces strong silk for use in unique situations throughout its l...

    Authors: Nobuaki Kono, Hiroyuki Nakamura, Ayaka Tateishi, Keiji Numata and Kazuharu Arakawa
    Citation: Zoological Letters 2021 7:11
    Content type: Research article Published on:

  19. The taxonomy of many groups of meiofauna is challenging due to their low number of diagnostic morphological characters and their small body size. Therefore, with the advent of molecular techniques that provide...

    Authors: Daniel Stec, Matteo Vecchi, Magdalena Dudziak, Paul J. Bartels, Sara Calhim and Łukasz Michalczyk
    Citation: Zoological Letters 2021 7:9
    Content type: Research article Published on:

  20. Insect eggshells must meet various demands of developing embryos. These demands sometimes conflict with each other; therefore, there are tradeoffs between eggshell properties, such as robustness and permeabili...

    Authors: Minoru Moriyama, Kouji Yasuyama and Hideharu Numata
    Citation: Zoological Letters 2021 7:8
    Content type: Research article Published on:

  22. Recent years have brought undeniable progress in tardigrade taxonomy, and speciose complexes were detected in a number of phylogenetic lineages. The family Echiniscidae is one such lineage; it is one of the mo...

    Authors: Piotr Gąsiorek, Katarzyna Vončina, Joanna Ciosek, Mariana Veloso, Paulo Fontoura and Łukasz Michalczyk
    Citation: Zoological Letters 2021 7:6
    Content type: Research article Published on:

  23. Despite the growing number of studies describing digit ratio patterns in tetrapods, knowledge concerning certain basic issues is still scarce. In lower vertebrates such as tailless amphibians (Anura), the numb...

    Authors: Mikołaj Kaczmarski, Jan M. Kaczmarek, Łukasz Jankowiak, Krzysztof Kolenda and Piotr Tryjanowski
    Citation: Zoological Letters 2021 7:5
    Content type: Research article Published on:

  24. Many animals switch between asexual and sexual reproduction in nature. We previously established a system for the sexual induction of planarian Dugesia ryukyuensis by feeding asexual planarians with minced sexual...

    Authors: Takanobu Maezawa, Masaki Ishikawa, Kiyono Sekii, Go Nagamatsu, Ryohei Furukawa and Kazuya Kobayashi
    Citation: Zoological Letters 2021 7:4
    Content type: Research article Published on:

  25. Vertebrate extraocular muscles (EOMs) function in eye movements. The EOMs of modern jawed vertebrates consist primarily of four recti and two oblique muscles innervated by three cranial nerves. The development...

    Authors: Shunya Kuroda, Noritaka Adachi, Rie Kusakabe and Shigeru Kuratani
    Citation: Zoological Letters 2021 7:3
    Content type: Research article Published on:

  26. Quaternary environmental changes fundamentally influenced the genetic diversity of temperate-zone terrestrial animals, including those in the Japanese Archipelago. The genetic diversity of present-day populati...

    Authors: Azusa Nakamoto, Masashi Harada, Reiko Mitsuhashi, Kimiyuki Tsuchiya, Alexey P. Kryukov, Akio Shinohara and Hitoshi Suzuki
    Citation: Zoological Letters 2021 7:2
    Content type: Research article Published on:

  27. In the pineal organ of zebrafish larvae, the bistable opsin parapinopsin alone generates color opponency between UV and visible light. Our previous study suggested that dark inactivation of the parapinopsin ph...

    Authors: Baoguo Shen, Seiji Wada, Haruka Nishioka, Takashi Nagata, Emi Kawano-Yamashita, Mitsumasa Koyanagi and Akihisa Terakita
    Citation: Zoological Letters 2021 7:1
    Content type: Research article Published on:

  28. Appetite or feeding motivation relies significantly on food odors. In the blowfly Phormia regina, feeding motivation for sucrose is decreased by the odor of d-limonene but increased by the odor of 1-octen-3-ol od...

    Authors: Toru Maeda, Tomoyosi Nisimura, Shunnya Habe, Tatsuya Uebi and Mamiko Ozaki
    Citation: Zoological Letters 2020 6:16
    Content type: Research article Published on:

  29. Insect outbreaks often occur in the absence of natural enemies and in the presence of excess suitable host materials. Outbreaks of gypsy moths are especially problematic in remote areas located in high-latitud...

    Authors: Masahiro Komatsu, Keigo Kurihara, Susumu Saito, Mana Domae, Naoki Masuya, Yuta Shimura, Shunichiro Kajiyama, Yuna Kanda, Kouki Sugizaki, Kouji Ebina, Osamu Ikeda, Yudai Moriwaki, Naohiro Atsumi, Katsuyoshi Abe, Tadashi Maruyama, Satoshi Watanabe…
    Citation: Zoological Letters 2020 6:15
    Content type: Research article Published on:

  30. The jaw apparatus in several annelid families represents a powerful tool for systematic approaches and evolutionary investigations. Nevertheless, for several taxa, this character complex has scarcely been inve...

    Authors: Alexander Tzetlin, Nataliya Budaeva, Elena Vortsepneva and Conrad Helm
    Citation: Zoological Letters 2020 6:14
    Content type: Research article Published on:

  32. The circadian clock generates rhythms of approximately 24 h through periodic expression of the clock genes. In insects, the major clock genes period (per) and timeless (tim) are rhythmically expressed upon their ...

    Authors: Yasuaki Tomiyama, Tsugumichi Shinohara, Mirai Matsuka, Tetsuya Bando, Taro Mito and Kenji Tomioka
    Citation: Zoological Letters 2020 6:12
    Content type: Research article Published on:

  33. Stephanella hina is a little studied freshwater bryozoan belonging to Phylactolaemata. It is currently the only representative of the family Stephanellidae, which in most reconstructions is early branching, somet...

    Authors: Thomas F. Schwaha and Masato Hirose
    Citation: Zoological Letters 2020 6:11
    Content type: Research article Published on:

  35. Fluorescence and luminescence are widespread optical phenomena exhibited by organisms living in terrestrial and aquatic environments. While many underlying mechanistic features have been identified and charact...

    Authors: Marie-Lyne Macel, Filomena Ristoratore, Annamaria Locascio, Antonietta Spagnuolo, Paolo Sordino and Salvatore D’Aniello
    Citation: Zoological Letters 2020 6:9
    Content type: Review Published on:

  36. Camels have evolved various resistance characteristics adaptive to their desert habitats. In the present study, we used high-throughput sequencing to investigate stress-induced alternative splicing events as w...

    Authors: Dong Zhang, Jing Pan, Huanmin Zhou and Yu Cao
    Citation: Zoological Letters 2020 6:8
    Content type: Research article Published on:

  37. Owing to their incomplete adaptation to the terrestrial environment, amphibians possess complex cutaneous glandular systems. The skin glands not only regulate water loss and respiratory gas and salt exchange, ...

    Authors: Yuzhou Gong, Yiwei Zeng, Puyang Zheng, Xun Liao and Feng Xie
    Citation: Zoological Letters 2020 6:7
    Content type: Research article Published on:

  38. We examine evidence for natural selection resulting in Apis mellifera becoming tolerant or resistant to Varroa mites in different bee populations. We discuss traits implicated in Varroa resistance and how they ca...

    Authors: Jacques J. M. van Alphen and Bart Jan Fernhout
    Citation: Zoological Letters 2020 6:6
    Content type: Review Published on:

    The Correction to this article has been published in Zoological Letters 2020 6:10

  40. Little is known about the life history of oarfish of the genus Regalecus, although it is a famous deep-sea fish and an apparent origin of sea serpent legends. We successfully performed artificial insemination usi...

    Authors: Shin-ichiro Oka, Masaru Nakamura, Ryo Nozu and Kei Miyamoto
    Citation: Zoological Letters 2020 6:4
    Content type: Research article Published on:

  41. Some insects possess complex three-dimensional (3D) structures that develop under the old cuticle prior to the last imaginal molt. Adult treehoppers (Insecta: Hemiptera: Auchenorrhyncha: Membracidae) have one ...

    Authors: Haruhiko Adachi, Keisuke Matsuda, Kenji Nishida, Paul Hanson, Shigeru Kondo and Hiroki Gotoh
    Citation: Zoological Letters 2020 6:3
    Content type: Research article Published on:

  42. Richtersius coronifer, the nominal species for the family Richtersiidae and a popular laboratory model, exemplifies a common problem in modern tardigrade taxonomy. Despite undeniable progress in the field, many o...

    Authors: Daniel Stec, Łukasz Krzywański, Kazuharu Arakawa and Łukasz Michalczyk
    Citation: Zoological Letters 2020 6:2
    Content type: Research article Published on:

  43. Based on 20,000 records representing c. 11,000 individuals from an 8-year capture-mark-recapture (CMR) study, we tested and confirmed a new case of invariant clutch size (ICS) in a sexually dichromatic lacertid l...

    Authors: Jhan-Wei Lin, Ying-Rong Chen, Tsui-Wen Li, Pei-Jen L. Shaner and Si-Min Lin
    Citation: Zoological Letters 2020 6:1
    Content type: Research article Published on:

  45. Despite numerous approaches to the resolution of euarthropod phylogeny, mainly based on modern sequence information and traditional external morphology, the resulting hypotheses are often contradictory and lea...

    Authors: Maite Maurer, Janina Hladik, Thomas M. Iliffe and Torben Stemme
    Citation: Zoological Letters 2019 5:36
    Content type: Research article Published on:

  46. Absorption spectra of opsin-based pigments are tuned from the UV to the red regions by interactions of the chromophore with surrounding amino acid residues. Both vertebrates and invertebrates possess long-wave...

    Authors: Tomoka Saito, Mitsumasa Koyanagi, Tomohiro Sugihara, Takashi Nagata, Kentaro Arikawa and Akihisa Terakita
    Citation: Zoological Letters 2019 5:35
    Content type: Research article Published on:

  47. Self-incompatibility, fusion/non-fusion reactions, and contact reactions (CRs) have all been identified as allorecognition phenomena in ascidians. CR is a reaction characteristic of the hemocytes of Halocynthia r...

    Authors: Masaki Ema, Taizo Okada, Miki Takahashi, Masato Uchiyama, Hideo Kubo, Hideaki Moriyama, Hitoshi Miyakawa and Midori Matsumoto
    Citation: Zoological Letters 2019 5:34
    Content type: Research article Published on:

  48. The relationship between development and evolution has been a central theme in evolutionary developmental biology. Across the vertebrates, the most highly conserved gene expression profiles are found at mid-em...

    Authors: Masahiro Uesaka, Shigeru Kuratani, Hiroyuki Takeda and Naoki Irie
    Citation: Zoological Letters 2019 5:33
    Content type: Research article Published on:

  49. Metazoans have evolved a great variety of life histories in response to environmental conditions. A unique example is encountered in dicyemid mesozoans. In addition to a highly simplified adult body comprising...

    Authors: Tsai-Ming Lu, Hidetaka Furuya and Noriyuki Satoh
    Citation: Zoological Letters 2019 5:32
    Content type: Research article Published on:

  50. Even subtle changes in environmental factors can exert behavioral effects on creatures, which may alter interspecific interactions and eventually affect the ecosystem. However, how changes in environmental fac...

    Authors: Masato Mori, Maria Narahashi, Tetsutaro Hayashi, Miyuki Ishida, Nobuyoshi Kumagai, Yuki Sato, Reza Bagherzadeh, Kiyokazu Agata and Takeshi Inoue
    Citation: Zoological Letters 2019 5:31
    Content type: Research article Published on:
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