Evidence cluster — Corn snake (Pantherophis guttatus) husbandry, health & nutrition (peer-reviewed, Europe PMC)

Evidence: Corn snake (Pantherophis guttatus) husbandry, health & nutrition

Source: Europe PMC (Europe PubMed Central) REST search — first-hand peer-reviewed abstract records, pulled 2026-08-01. Queries covered husbandry, health/disease/parasitology, and nutrition/feeding for Pantherophis guttatus. The cluster returns 12 representative studies with abstracts below. Abstract text is verbatim from source; each study is traceable by PMID.

Studies

PMID 42193776 (2026, Animals : an open access journal from MDPI) — Effect of Racking Systems Versus Enriched Terraria on Fecal Glucocorticoid Metabolites in Four Species of Captive Snakes: A Pilot Study.. Abstract (opening): Fecal glucocorticoid metabolites (FGM) are widely used to assess hypothalamic-pituitary-adrenal (HPA) activity in vertebrates, but their applicability to reptiles, and more specifically to snakes, remains poorly explored. The objective of the present study was to determine how changes in housing conditions, from a standard racking system to enriched terraria, affect fecal glucocorticoid metabolite concentrations as a proxy potentially related to endocrine activity and stress response. A total of 58 fecal samples were collected across three different phases from 12 snakes representing four species: Boa constrictor (BC), Lampropeltis polyzona (LP), Pantherophis guttatus (PG), and Python regius (PR). FGM concentrations ranged from 54.9 to 832.2 ng/g, with a mean value of 298.4 ± 171.6 ng/g (mean ± SD). Data showed marked inter-individual variability, while within-individual concentrations remained relatively stable across experimental phases. PG exhibited the highest FGM concentrations during the study, with LP showing intermediate levels and PR and BC the lowest. The results showed that housing conditions did not have a significant effect on FGM concentrations in the studied population. In conclusion, the present study showed that fecal hormone analysis provides an integrated measure of glucocorticoid metabolites concentrations over time, potentially reflecting physiological differences among snake species.

Source: https://pubmed.ncbi.nlm.nih.gov/42193776/

PMID 42071908 (2026, Animals : an open access journal from MDPI) — Composition and Legal Aspects of Reptiles and Amphibians Displayed at an Exotic Pet Fair in Warsaw (Poland).. Abstract (opening): The global exotic pet trade has expanded in recent decades, raising concerns related to animal welfare, biodiversity conservation, and compliance with international regulations. Reptiles and amphibians constitute a major component of this trade, yet information on species availability and trade practices at exotic pet fairs remains limited. The primary aim of this study was to identify the reptile and amphibian species offered for sale at an exotic pet fair in Warsaw, Poland. Secondary objectives were to assess the declared origin of the animals and the availability of information regarding their legal and conservation status. Photographic documentation of all exhibition tables was used to record species identity, number of individuals, and labeling practices. In total, 818 individuals representing 74 species from 31 families were recorded. Reptiles, particularly squamates, dominated the assemblage, while amphibians accounted for a smaller proportion of the animals offered. More than half of the individuals were labeled as captive-bred, whereas only a small fraction were identified as imported or wild-caught; however, information on origin was absent for nearly half of the animals. Over 50% of the recorded species were listed in Appendix II of the Convention on International Trade in Endangered Species of Wild Fauna and Flora, yet no visible information on legal or conservation status was provided at the point of sale. These findings indicate that inconsistent labeling limits transparency and informed decision-making by buyers.

Source: https://pubmed.ncbi.nlm.nih.gov/42071908/

PMID 41753677 (2026, Microorganisms) — Preliminary Screening for Ophidiomyces ophidiicola in Pet Snakes from Italy and Exploratory Evaluation of Droplet Digital PCR Assay.. Abstract (opening): Ophidiomycesophidiicola, the agent of ophidiomycosis, has recently been reported in wild snakes in Italy, but the status of captive populations remains unknown. We carried out an opportunistic survey of pet snakes from private collections and, in parallel, performed an exploratory evaluation of a droplet digital PCR (ddPCR) assay adapted from an established probe-based real-time PCR. Non-invasive skin swabs were collected by 32 private owners from 97 snakes, representing 31 species across ten Italian regions. All swabs tested negative for O. ophidiicola by both methods, including samples from four snakes that showed cutaneous lesions at the time of sampling. Both assays yielded consistent amplification up to the 1:1000 dilution (ddPCR 0.38 to 0.94 copies/µL for the culture-derived control and 0.24 to 0.33 copies/µL for the field-derived control at 1:1000), while ddPCR retained positive partitions in some replicates at higher dilutions (up to 1:8000). These results provide preliminary screening data for O. ophidiicola in an opportunistic sample of Italian pet snakes and suggest potential applicability of ddPCR as a complementary tool for low-template diagnostics, while highlighting the need for larger, standardised surveys and formal assay validation.

Source: https://pubmed.ncbi.nlm.nih.gov/41753677/

PMID 42071944 (2026, Animals : an open access journal from MDPI) — Molecular Sex Determination in Caenophidian Snakes Using qPCR Amplification of Sex-Linked Genes: Validation and Interspecific Comparison.. Abstract (opening): Accurate sex identification in reptiles with genotypic sex determination is essential for breeding management, veterinary care and evolutionary research, yet commonly used methods are often invasive, stressful or unreliable. This study aimed to evaluate a dosage-based quantitative PCR approach for molecular sex determination in caenophidian snakes, using naturally shed epidermal skin as a non-invasive DNA source. Genomic DNA extracted from shed skin was analysed by qPCR targeting conserved Z-linked genes (ADARB2, ARMC4 and TANC2), together with autosomal and reference genes, to assess sex-specific differences in gene copy number. Sixteen caenophidian snake species were examined, including taxa for which molecular sexing data are currently scarce or unavailable. The autosomal control gene showed dosage ratios close to parity between sexes, supporting DNA quality and reference gene reliability; meanwhile, Z-linked markers generally exhibited reduced dosage in females relative to males, consistent with a ZZ/ZW sex determination system. These results demonstrate that dosage-based qPCR applied to shed epidermal skin provides a promising and non-invasive framework for molecular sex determination in caenophidian snakes, without compromising animal welfare.

Source: https://pubmed.ncbi.nlm.nih.gov/42071944/

PMID 41793465 (2026, Parasitology research) — Single oral-dose fluralaner treatment against Ophionyssus natricis infestation - a large scale study demostrating long-term efficacy in captive snakes.. Abstract (opening): The hematophagous mite Ophionyssus natricis, vector of several viral and bacterial diseases in snakes, is one of the most challenging pathogens for snake breeders. The high environmental resistance of its larval stage makes repeated treatment of the animals unavoidable, while eradication of the mites from enclosures requires extensive cleansing and disinfection, often involving chemical products with known toxicity. The use of ectoparasiticides of the family of isoxazoline have recently proved effective against both adult and larvae of O. natricis, nevertheless data for fluralaner remains limited, particularly in large cohorts. In this study, 1579 snakes representing 18 different species were treated orally with a liquid formulation of fluralaner (Exzolt®) at 2.5 mg/kg, administered either by injection into the prey prior to feeding or via gastric gavage. Mite detachment and mortality occurred within 5 h, and no reinfestation was observed during subsequent 6-months follow-up period, despite the absence of environmental treatments. No side effects were reported in any treated animals, and no negative impact was observed on oviposition or hatching rate. The prolonged efficacy observed in this study further supports its suitability as a minimally invasive yet highly effective treatment of O. natricis infestations in snakes, given the long half-life of fluralaner already documented in mammals.

Source: https://pubmed.ncbi.nlm.nih.gov/41793465/

PMID 42267348 (2026, Frontiers in veterinary science) — Intestinal overgrowth of Clostridium perfringens and reduced cadA gene copy number characterize fatal diarrhea in captive corn snakes (Pantherophis guttatus).. Abstract (opening): <h4>Introduction</h4>Fatal diarrhea has recently emerged as a significant health problem in captive-bred corn snakes (Pantherophis guttatus), particularly among juveniles under 6 months of age. Affected snakes typically present with watery diarrhea, anorexia, dehydration, and high mortality.<h4>Methods</h4>To clarify the etiological basis of this syndrome, we investigated bacterial pathogens associated with fatal diarrhea and characterized virulence gene profiles of predominant isolates. Rectal swabs were collected from healthy and diarrheic snakes, and pathogen detection and bacterial loads were quantified.<h4>Results</h4>Clostridium perfringens demonstrated a significantly higher detection rate and rectal bacterial load in diarrheic snakes compared with healthy individuals (p = 0.0007; p < 0.0001), whereas Salmonella spp. and Escherichia coli were not associated with disease status. Toxinotyping of 24 C. perfringens isolates identified toxinotypes A, B, D, and G without a disease-specific distribution, suggesting that toxinotype alone is insufficient to explain outbreak occurrence. Quantitative analysis of five virulence-associated genes, including cell-wall-anchored extracellular nuclease (cadA), collagen adhesion protein (cna), sialidase (nanI), necrotic enteritis B-like toxin (netB), and toxin C. perfringens large cytotoxin (tpeL) genes, revealed a significantly lower cadA gene copy number in isolates from diarrheic snakes (p = 0.0343), while no significant differences were observed for the other genes.<h4>Discussion</h4>Fatal diarrhea in captive corn snakes is associated with increased intestinal colonization by C. perfringens, rather than with toxinotype variation. The reduced cadA gene copy number observed in isolates from diarrheic snakes suggests a potential role for biofilm-related mechanisms in disease expression, although functional studies are required for confirmation. These findings provide field-based evidence supporting the involvement of C. perfringens overgrowth in reptile enteric disease and may inform future disease monitoring and management strategies in intensive breeding systems.

Source: https://pubmed.ncbi.nlm.nih.gov/42267348/

PMID 42015477 (2026, Journal of anatomy) — Histological and immunohistochemical analysis of gonadal development in the corn snake (Pantherophis guttatus).. Abstract (opening): Snakes are a group of vertebrates with many unique features, such as significant body elongation, asymmetric positioning of viscera, and the loss of limbs. They belong to the squamate reptiles, one of the vertebrate groups with the most poorly studied gonadogenesis. This study presents the results of histological analyses on gonadal development in embryos of the corn snake (Pantherophis guttatus), covering the period from the initial formation of gonadal primordia, through the phase of undifferentiated gonads, sexual differentiation, to the establishment of the structures of testes and ovaries. The findings indicate that gonadal ridges in this species emerged on the ventral surface of the mesonephros on the first day after oviposition. Undifferentiated gonads were typically composed of primitive cortex and medulla, both containing germ cells. By Day 9 of egg incubation, sexual differentiation of gonads commenced. Testes were recognizable by the presence of distinct testis cords. The developing testes were covered by a thin epithelium devoid of germ cells. In differentiating ovaries, germ cells persisted in the cortex that became thickened in the region opposite to the gonadal mesogonium. Sex cords in the ovarian medulla were not clearly differentiated, and a lumen began to form in them. In subsequent stages, germ cells in the ovarian cortex entered meiosis, and the lumen expanded in the medulla. Additionally, the gonadal primordia and sexually differentiating gonads are symmetrically positioned. However, in later development, the left ovary and testis are positioned posteriorly relative to the right counterparts. The gonadal development of the corn snake shares several features with other squamate species, particularly geckos.

Source: https://pubmed.ncbi.nlm.nih.gov/42015477/

PMID 42408373 (2026, Zootaxa) — Contribution to the knowledge of the weevil tribe Rhamphini (Coleoptera: Curculionidae, Curculioninae) of India.. Abstract (opening): A study on Rhamphini from different states of India was conducted during which one new subgenus and five new species new were discovered, as well as a number of species new to the Indian fauna. A new subgenus, Orchomizo Zabaluev subgen. nov. (type species Orchestescombinatus Zabaluev sp. nov.), of the genus Orchestes Illiger, 1798 is described based on the structure of the metatibiae, prosternum and mesosternum. Five new species are described from India as follows: Morimotonomizo chilikaensis Zabaluev sp. nov. (Odisha), Indodinorrhopalus surya Zabaluev sp. nov. (Goa), I. yaksha Zabaluev sp. nov. (Goa), Orchestes (Orchomizo) combinatus Zabaluev sp. nov. (Odisha) and O. (Salius) asetosus Zabaluev sp. nov. (Goa). A new combination, Morimotonomizo freyi (Voss, 1958) comb. nov., is proposed. The following species are recorded for India for the first time: Rhamphus medvedevi Korotyaev, 1994, Morimotonomizo fasciatus Kojima, 1997, M. flacourtiae (Marshall, 1957), M. freyi (Voss, 1958) comb. nov., Indodinorrhopalus guttatus Morimoto & Miyakawa, 1996, Orchestes (s. str.) basirostris (Voss, 1953), and O. (Salius) parvidens (Voss, 1958). Images of the habitus, genitalia, and other morphological details are provided for most species for the first time.

Source: https://pubmed.ncbi.nlm.nih.gov/42408373/

PMID 42032687 (2026, BMC veterinary research) — Species-specific variations in corticosterone concentrations in captive snake shed skins: implications for housing systems and welfare.. Abstract (opening): <h4>Background</h4>Captive reptiles may experience stress related to environmental conditions, and housing design is considered a key factor influencing their welfare. This study assessed corticosterone concentrations in shed skins as a non-invasive biomarker of chronic stress in three commonly kept snake species-Boa imperator, Python regius, and Pantherophis guttatus-maintained either in low-stimulus rack systems or enriched terraria. Shed skins were collected from privately owned snakes and from a breeders, prepared following standardized protocols, and analyzed using ELISA assays. Non-parametric statistical methods (Mann-Whitney U tests) were applied due to non-normal data distribution.<h4>Results</h4>Variation in corticosterone concentrations was observed among the studied species, with higher values recorded in P. guttatus compared to B. imperator and P. regius. The effects of housing conditions differed between species. In P. regius, individuals kept in enriched terraria exhibited higher corticosterone concentrations than those housed in rack systems, whereas the opposite pattern was observed in P. guttatus, where snakes maintained in rack systems showed elevated corticosterone levels. No clear housing-related differences were observed in B. imperator. Species-specific relationships between enclosure volume and corticosterone concentration were identified, with positive associations in P. regius, negative associations in P. guttatus, and no apparent relationship in B. imperator.<h4>Conclusions</h4>The study indicates interspecific variation in corticosterone deposition in snake shed skin and demonstrates that the relationship between housing conditions and corticosterone levels is species-specific. More active species, such as P. guttatus, may be more sensitive to spatial restriction and limited environmental complexity, whereas less active species, such as P. regius and B. imperator, may respond differently to housing conditions. These findings underscore the importance of species-tailored welfare guidelines, suggesting that enclosure design and enrichment strategies should be adapted to the behavioural ecology and physiological characteristics of individual snake species rather than applied uniformly across taxa.

Source: https://pubmed.ncbi.nlm.nih.gov/42032687/

PMID 41893541 (2026, Toxins) — In-Depth Multi-Assembler Venom-Gland Transcriptomics of Three Medically Important Colombian Snakes Highlights Diversity of Accessory, Low-Abundance Protein Families.. Abstract (opening): Typically, most omics analysis (proteomic and transcriptomic) of snakes are focused on the dominant enzymatic proteins used for evolutionary analysis or those engaged in envenoming symptoms. This study presents a comprehensive multi-assembler transcriptomic analysis focused on the non-dominant and enzymatic or non-enzymatic putative proteins of the venom glands of three medically significant Colombian snake species. Together, these results highlight how continued improvements in modern omics workflows, coupled with extensive manual curation, enable more complete putative protein variants discovery when multiple assemblers are integrated. Here, we reconstructed the toxinomes of the viperids Bothrops asper and Crotalus durissus cumanensis, and the elapid Micrurus mipartitus, by comparing four assemblers (Trinity, SPAdes, SOAPdenovo-Trans k = 31 and k = 97) and integrating them into a non-redundant meta-assembly. Protein-candidate alignments were extensively inspected, and validation of conserved domains and functional motifs are discussed. The curated toxinomes revealed substantial diversity across major and accessory families, and assembler choice strongly affected transcript variant recovery. Together, these results provide a more comprehensive view of venom-gland transcriptome analysis and diversity, expanding the set of candidate venom components for future functional and proteomic validation, with potential implications for venom composition studies and antivenom development.

Source: https://pubmed.ncbi.nlm.nih.gov/41893541/

PMID 41967469 (2026, Genome biology and evolution) — Snakes (Colubridae: Erythrolamprus) With a Complex Toxic Diet Show Convergent yet Highly Heterogeneous Voltage-gated Sodium Channel Evolution.. Abstract (opening): Chemical defense has evolved convergently across multiple lineages and plays a crucial role in shaping ecological communities through selection for toxin resistance. Research on toxin resistance has been pivotal in understanding the genetic basis of trait evolution, as resistance can evolve through mutations in a few target genes, resulting in target-site resistance (TSR). However, in tropical ecosystems, multiple selective pressures from prey with different toxins create complex chemical scenarios for predators that require multiple resistance mechanisms. Royal ground snakes (Erythrolamprus spp.) are significant but understudied predators of poisonous frogs (families Bufonidae and Dendrobatidae), whose toxins affect voltage-gated sodium channels (VGSCs) and other neuromuscular system proteins. In this study, we investigated the evolution of TSR in VGSC genes in relation to toxic frog predation in Erythrolamprus snakes, tracing the phylogenetic origin and geographic distribution of TSR-conferring genotypes across six species in this group. Our findings reveal convergent yet highly heterogeneous TSR evolution in at least two species that evolved to predate poisonous frogs, and possibly in a third one. Amino acid changes at nine resistance-related positions across eight VGSC genes were identified, suggesting a shared evolutionary path across this gene family. Four of these changes are known to provide tetrodotoxin resistance in other animals. We observed polymorphism in resistance-related sites across species and VGSC paralogs, hinting at a complex evolutionary history of alleles at these loci. These findings offer new insights into adaptive mechanisms in predators with complex toxic diets and introduce Erythrolamprus as a model to understand variation in toxin resistance mechanisms.

Source: https://pubmed.ncbi.nlm.nih.gov/41967469/

PMID 41183498 (2026, Genetics) — Candidate genes underlying hypomelanistic morphs in squamate reptiles.. Abstract (opening): Skin coloration is crucial for the survival of animals and ranges from spectacular colorful displays used to attract a mate to cryptic camouflage used to avoid predators. Among the 3 main types of chromatophores, melanophores are the most widespread in vertebrates and can set the skin tone by the amount of melanin they produce and store in dedicated vesicles, the melanosomes. Mutations associated with melanophore differentiation and maturation result in hypomelanistic and amelanistic phenotypes, both extensively studied in mammals but less so in snakes and lizards. Here, we characterize at the genomic, transcriptomic, and histological level, the Hypomelanistic corn snake morph and 3 hypomelanistic leopard gecko morphs. To minimize bias in studying leopard gecko color morphs, we first assembled a chromosome-level genome from a wild-type individual in terms of coloration. We propose that candidate mutations in 3 melanogenesis factors generate these phenotypes: (i) tyrosinase (TYR), an essential enzyme for melanin synthesis, (ii) NCKX5 (SLC24A5), an ion exchanger involved in melanosome maturation, and (iii) the P protein (OCA2), a transmembrane transporter for tyrosine. Our extended bulk RNA sequencing analyses show that additional pigmentation-related genes, affecting melanin production, melanosome motility, and melanophore migration, are dysregulated in the embryonic skin of the mutated animals. This observation highlights the likely associations among the corresponding pathways and is in line with our electron microscopy imaging results. Indeed, the subcellular structure of melanophores is uniquely altered at each of the 4 morphs and likely reflects a multigenic effect. These findings demonstrate that conserved pigmentation genes can produce species-specific effects, underscoring the modular nature of skin coloration in vertebrates. Our work establishes reptiles as comparative models for studying pigment cell biology and reveals evolutionary flexibility in the genetic regulation of melanogenesis.

Source: https://pubmed.ncbi.nlm.nih.gov/41183498/

Source text: pdf-raw/evidence/europepmc_corn_snake_husbandry_health_2026-08-01.txt (Europe PMC first-hand abstracts, pulled 2026-08-01).

Evidence cluster — Corn snake (Pantherophis guttatus) husbandry, health & nutrition (peer-reviewed, Europe PMC)

Evidence: Corn snake (Pantherophis guttatus) husbandry, health & nutrition

Studies

Sources

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