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Home Science & Environment

Morphology and Chemical Composition of the Nuchal Glands of Indonesian Snakes With a Description of a Novel Type of Glands todayheadline

August 16, 2025
in Science & Environment
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Several species of natricine snakes sequester bufadienolides from toads, store them in their nuchal glands, and reutilize them for their defense. This study aimed to examine the presence and morphological features of nuchal glands of natricine snakes distributed in Indonesia, containing several lineages of this group. When the presence of the glands was confirmed, the gland fluids were analyzed to identify their chemical components. Secretions from the parotoid glands of several species of toads in Indonesia were also analyzed. Morphological examination of the glands was conducted by observing the presence or absence of structures and recording the spatial pattern of the glands. The glandular fluids of three snake species and four toad species were extracted and analyzed by liquid chromatography/mass spectrometry (LC/MS). Nuchal glands or organs similar to the glands were found on the head or neck region of preserved or freshly dead specimens of Rhabdophis subminiatus, R. flaviceps, R. rhodomelas, and Rhabdophis spp. of Sulawesi, although such a gland was not found in the other genera of natricine snakes. These Rhabdophis species have different spatial patterns of glands, and particularly Rhabdophis spp. of Sulawesi showed an unusual novel gland form in the temporal and occipital regions of the head, possibly comparable to the nuchal glands. Bufadienolides of the bufogenin and bufotoxin types were identified from all toad gland fluids. In contrast, the glandular fluids of snakes, R. subminiatus, R. flaviceps, and Rhabdophis spp. of Sulawesi store only bufogenin-type bufadienolides. Bufadienolide profiles of snakes and toads indicate that the toxin composition is highly diverse among species. The results suggest that snakes would be able to chemically convert dietary bufadienolides from toads and reutilize some bufadienolides readily. This study demonstrated that the form and location of “nuchal glands” in a snake’s body are more diverse than previously recognized.

Anita, S., Inoue, T., Inoue, A., Eto, K., Hamidy, A., Mori, N., & Mori, A. (2025). Morphology and Chemical Composition of the Nuchal Glands of Indonesian Snakes With a Description of a Novel Type of Glands. Journal of Morphology, 286(8), e70071. https://doi.org/10.1002/jmor.70071

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