Deltamysis holmquistae from the NSC; ♂ ad., 3.4 mm A ♂ in toto, lateral, thoracopods 2–8 broken B cephalothorax, dorsal C cephalic region, ventral D penis (pe) with spermatozoa (sz) and thoracic sternites 4–8, ventral; penis forced tightly against the sternites by the cover glass E telson, dorsal. A–C, E objects artificially separated from background. Micrographs by K.J. Wittmann.

 
 
  Part of: Wittmann KJ, van Haaren T, Vlierboom R (2024) The world-wide invader Deltamysis holmquistae expanded to the East Atlantic and Diamysis lagunaris to the North Sea (Crustacea, Mysida). Aquatic Invasions 19(4): 413-429. https://doi.org/10.3391/ai.2024.19.4.141425