An integrative study of Anemonia viridis (Forsskål, 1775) and Aiptasia couchii (Cocks, 1851) (Cnidaria: Anthozoa) from the North Adriatic Sea S. ArossaC. CerranoC. G. Di Camillo Original Paper 04 October 2021 Pages: 421 - 435
Ultrastructure and functional morphology of the dorsal organs in Scoloplos armiger (Annelida, Sedentaria, Orbiniida) Jana Sophia BuhreGünter Purschke Original Paper Open access 20 October 2021 Pages: 437 - 452
New data on the ultrastructure of the proboscis in females of Bonellia viridis (Annelida: Bonellinae) Petr KuznetsovAlexander EreskovskyElena Temereva Original Paper 27 September 2021 Pages: 453 - 468
A picture is worth a thousand words: novel photographic evidence on the anatomy of the digestive system of three shipworm species (Bivalvia, Teredinidae) L. M. S. BorgesB. PfeiferB. Altermark Original Paper 28 September 2021 Pages: 469 - 485
Sensory equipment and adaptations to the fire habitat of the antennae of the Australian ´firebeetle´ Merimna atrata (Coleoptera; Buprestidae) Anke SchmitzHelmut Schmitz Original Paper Open access 20 October 2021 Pages: 487 - 504
Brittlestars with a bite: a new kind of pedicellaria in echinoderms Richard L. TurnerJason M. BoucherNicole W. Becker Original Paper 30 September 2021 Pages: 505 - 525
The pericardium of Oikopleura dioica (Tunicata, Appendicularia) contains two distinct cell types and is rotated by 90 degrees to the left Mai-Lee Van LeMaria NovosolovThomas Stach Original Paper Open access 04 September 2021 Pages: 527 - 537
A comparative study of cranial osteogenesis in turtles: implications for the diversification of skull morphology Masayoshi TokitaTakumi WatanabeChiyo Kitayama Original Paper 26 October 2021 Pages: 539 - 554