1. Measuring proboscis length in Lepidoptera: a review

   • Flóra Vajna
   • János Kis
   • Viktor Szigeti

   Review Open access 22 November 2020 Pages: 1 - 15

   

2. Correction to: Measuring proboscis length in Lepidoptera: a review

   • Flóra Vajna
   • János Kis
   • Viktor Szigeti

   Correction Open access 23 January 2021 Pages: 17 - 17

3. Ultrastructure of spermatozoa and female copulatory organs in preferably asexually-reproducing acoel Convolutriloba retrogemma (Acoelomorpha)

   • Y. I. Zabotin
   • V. G. Evtugyn

   Original Paper 11 November 2020 Pages: 19 - 26

   

4. Comparative ultrastructure of the radiolar crown in Sabellida (Annelida)

   • Ekin Tilic
   • Greg W. Rouse
   • Thomas Bartolomaeus

   Original Paper Open access 07 December 2020 Pages: 27 - 45

   

5. Ontogeny of non-muscular brachial articulations in Balanocrininae (Echinodermata, Crinoidea): iterative trajectories or phylogenetic significance?

   • Nadia Améziane
   • Marc Eléaume
   • Michel Roux

   Original Paper 04 January 2021 Pages: 47 - 67

   

6. Digestive tract regeneration in the posteriorly eviscerating sea cucumber Holothuria parva (Holothuroidea, Echinodermata)

   • Mina Eisapour
   • Negin Salamat
   • Amir Parviz Salati

   Original Paper 20 January 2021 Pages: 69 - 83

   

7. Attachment devices and the tarsal gland of the bug Coreus marginatus (Hemiptera: Coreidae)

   • Manuela Rebora
   • Gianandrea Salerno
   • Stanislav N. Gorb

   Original Paper Open access 23 January 2021 Pages: 85 - 102

   

8. Diversity and sexual dimorphism in the head lateral line system in North Sea populations of threespine sticklebacks, Gasterosteus aculeatus (Teleostei: Gasterosteidae)

   • Harald Ahnelt
   • David Ramler
   • Sonja Windhager

   Original Paper Open access 30 December 2020 Pages: 103 - 117

   

9. Ontogenetic development of the shoulder joint muscles in frogs (Amphibia: Anura) assessed by digital dissection with implications for interspecific muscle homologies and nomenclature

   • Karolin Engelkes
   • Supak Panpeng
   • Alexander Haas

   Original Paper Open access 16 February 2021 Pages: 119 - 142

   

10. Hemipenial morphology of Epictia vellardi (Laurent, 1984) (Leptotyphlopidae, Serpentes) with the proposition and discussion of two general hemipenial patterns within the genus Epictia

    • Ana Carolina Ferreira
    • Julia Klaczko
    • Angele Martins

    Original Paper 23 November 2020 Pages: 143 - 150

    

11. Foveal shape, ultrastructure and photoreceptor composition in yellow-legged gull, Larus michahellis (Naumann, 1840)

    • N. Victory
    • Y. Segovia
    • M. García

    Original Paper 08 February 2021 Pages: 151 - 167

    

12. Does the osteon morphology depend on the body mass? A scaling study on macroscopic and histomorphometric differences between cow (Bos taurus) and sheep (Ovis aries)

    • Marco Zedda
    • Ramona Babosova

    Original Paper Open access 10 February 2021 Pages: 169 - 181