Thanks in advance for answering this question. It would be great if you could suggest any paper supporting this answer.

I found the following key information regarding the antennal gland in decapods.

The antennal glands (AnGs), which is also known as the green or maxillary gland, are located at the base of the antenna and connected to the external environment by the nephropore, consisting of a complex coelomosac and labyrinth (Holdich, 2002, Freire et al., 2008, Tsai and Lin, 2014). In decapod, AnGs are ion-regulating and excretory organs that are considered as important as gills in osmoregulation (Maddrell and O’Donnell, 1992, Charmantier et al., 2009). The AnGs play key physiological roles similar to the kidneys of vertebrates and the Malpighian tubules of insects due to their similar structure, which participates in filtering hemolymph to form urine and thereby maintaining the volume of the extracellular fluid and regulating its concentration of ions and nutrients (Lh, 1983; Lin et al., 2000; Freire et al., 2008). In addition to the control of hemolymph volume, it is also involved in the hyporegulation of hemolymph magnesium and sulfate, excretion of organic compounds, and reabsorption of the fluid, sugars, and amino acids from the primary urine filtrate (Holliday and Miller, 1984; Henry and Wheatly, 1992; Behnke et al., 1998). The AnGs are also the major site for the secretion of ecdysteroids from the hemolymph (Mykles, 2011). Recently, research has shown that AnGs are also a possible route of infection for viruses and parasites and may be involved in certain immune responses (Thrupp et al., 2013; Ryazanova et al., 2015; De Gryse et al., 2020; Liu et al., 2021). https://doi.org/10.1016/j.cbd.2023.101087