1. Spermatogenesis in the carnivorous sponge Lycopodina hypogea (Porifera, Demospongiae)

   • Jean Vacelet
   • Nicole Boury-Esnault
   • Alexander Ereskovsky

   Original Paper 16 February 2022 Pages: 1 - 17

   

2. Fine structure of mushroom bodies and the brain in Sthenelais boa (Phyllodocida, Annelida)

   • Patrick Beckers
   • Carla Pein
   • Thomas Bartolomaeus

   Original Paper Open access 02 December 2021 Pages: 19 - 36

   

3. Correction to: Fine structure of mushroom bodies and the brain in Sthenelais boa (Phyllodocida, Annelida)

   • Patrick Beckers
   • Carla Pein
   • Thomas Bartolomaeus

   Correction Open access 29 January 2022 Pages: 37 - 41

   

4. Formation and degeneration of scaled capillary notochaetae in Owenia fusiformis Delle Chiaje, 1844 (Oweniidae, Annelida)

   • Julian Müller
   • Thomas Bartolomaeus
   • Ekin Tilic

   Original Paper Open access 13 December 2021 Pages: 43 - 56

   

5. Comparative anatomy of the rostrosoma of Solifugae, Pseudoscorpiones and Acari

   • J. Matthias Starck
   • Jelena Belojević
   • Lisa Mehnert

   Original Paper Open access 07 January 2022 Pages: 57 - 80

   

6. Morphology of the sting apparatus in velvet ants of the subfamilies Myrmosinae, Dasylabrinae, Myrmillinae and Mutillinae (Hymenoptera: Mutillidae)

   • Alexander Kumpanenko
   • Dmytro Gladun
   • Lars Vilhelmsen

   Original Paper 29 January 2022 Pages: 81 - 94

   

7. Ultrastructural characterization of hemocytes in the oriental cockroach Blatta orientalis (Blattodea: Blattidae)

   • Savaş İzzetoğlu
   • Mehmet Salih Yıkılmaz
   • Gamze Turgay-İzzetoğlu

   Original Paper 21 January 2022 Pages: 95 - 100

   

8. The accessory neural arch: development, morphology, and systematic distribution

   • Philipp Thieme
   • Timo Moritz

   Original Paper Open access 30 December 2021 Pages: 101 - 113