1. The 50th Anniversary of the Laboratory of Embryology

   • Editorial Board

   EditorialNotes 29 January 2024 Pages: S1 - S1

2. On the Origin of Tentacles and Limbs in Deuterostomia

   • V. V. Malakhov
   • O. V. Ezhova

   REVIEW 29 January 2024 Pages: S2 - S28

   

3. Molecular Identity of Laonice cirrata (Sars, 1851) (Annelida, Spionidae) and Description of a New Laonice species from the Northwest Pacific

   • V. I. Radashevsky
   • A. V. Sikorski
   • A. B. Tzetlin

   ORIGINAL PAPERS 29 January 2024 Pages: S29 - S46

   

4. Fine Structure of the Gametes in Rhynchospio glandulosa (Annelida: Spionidae), a Hermaphrodite Brooding Larvae on the Parent’s Dorsum

   • V. I. Radashevsky
   • O. V. Yurchenko

   ORIGINAL PAPERS 29 January 2024 Pages: S47 - S60

   

5. Scyra bidentata (A. Milne-Edwards, 1873) (Brachyura: Epialtidae)—A New Host of the Rhizocephalan Parasacculina pilosella (Van Kampen & Boschma, 1925) (Rhizocephala: Polyascidae)

   • D. D. Golubinskaya
   • O. M. Korn
   • S. N. Sharina

   ORIGINAL PAPERS 29 January 2024 Pages: S61 - S68

   

6. Description of the Morphology of Pilidium incurvatum from Vietnam with Discussion of the Origin of Pilidia of the recurvatum Group (Nemertea, Pilidiophora)

   • A. V. Chernyshev

   ORIGINAL PAPERS 29 January 2024 Pages: S69 - S75

   

7. Ultrastructural Features of the Alimentary Canal in Hermaphroditic Appendicularians Oikopleura gracilis (Tunicata, Oikopleuridae)

   • A. V. Savelieva

   ORIGINAL PAPERS 29 January 2024 Pages: S76 - S89

   

8. Variability of Sea Urchin Larvae: The Jar Effect

   • A. Kalachev
   • A. Tankovich

   ORIGINAL PAPERS 29 January 2024 Pages: S90 - S97