The genus Apharyngostrigea comprises a group of diplostomoidean digeneans that parasitize birds of the family Ardeidae (herons), with approximately 20 species described worldwide. Despite numerous efforts, a robust phylogenetic framework to delimit species within the genus is still lacking, mainly due to the limited morphological variation among its members. This study employed an integrative taxonomic approach, combining nuclear and mitochondrial DNA sequences with morphological data to assess species boundaries within Apharyngostrigea based on specimens collected from southeastern Mexico. Using a combination of species discovery (Automatic Barcode Gap Discovery, Assemble Species by Automatic Partition, General Mixed Yule Coalescent and Poisson Tree Processes) and validation methods based on Bayesian gene tree topologies (BPP and PHRAPL). We found high diversity within this genus in southeastern Mexico. Our analyses supported the delimitation of four nominal species that were previously described and validated in this study, along with the redescription of three of them. In addition, through species delimitation methods and morphological examination, we identified two candidate species and/or lineages that require further evidence to be formally described. This study demonstrates that an integrative taxonomic approach provides a robust framework for species delimitation in taxonomically complex groups such as Apharyngostrigea.

Paraxerus cepapi is an arboreal tree squirrel that occurs in the Savanna biome of Africa, and information on its parasite diversity is limited and mostly qualitative. The aim of the study was to record the diversity and abundance of ecto- and helminth parasites associated with P. cepapi across its distribution in South Africa. P. cepapi individuals (n = 94) were opportunistically obtained from eight localities during 2020 to 2024. In total, 21 parasite species (19 ectoparasites and two nematodes) and one tick species group were identified. This included lice, ticks, fleas, a mesostigmatic mite, chiggers, nematodes and cestodes. Nematodes were the most prevalent (93·67%), followed by lice (80·85%). Syphatineria cepapi was recorded in 92·41% of P. cepapi, while an unknown Strongyloides species, resembling S. robustus, was recorded in 21·52% of squirrels. The lice species displayed variation in parasitope preference, while chiggers were primarily recorded in the ears. This study provides new country records for the lice species Werneckia paraxeri and Enderleinellus heliosciuri, for the chigger species Microtrombicula polymorpha, and for the nematode S. cf. robustus. New locality records were documented for the nematode S. cepapi in South Africa, and P. cepapi is a new host record for the eight chigger species and S. cf. robustus. It is evident that P. cepapi in South Africa hosts a considerably larger diversity of parasite taxa than previously recorded. Nematode counts were related to host length. These findings warrant future studies on the parasite diversity of P. cepapi in Africa.

Ectoparasites are commonly found on wild birds and might play an important role as vectors of pathogens. The Balearic Islands archipelago (Spain) is an ecological hotspot for wild birds due to its geographical location and habitat diversity. Although the avian fauna of the archipelago is well studied, little information is available regarding the ectoparasites infesting its wild bird populations. This study aimed to identify the diversity of ectoparasites (chewing lice, louse flies and ticks) and feather mites on wild birds in several locations on Menorca Island, as well as to assess the prevalence based on the migration status and season. Our research revealed that ten of the 13 species of chewing lice collected in this study are reported here for the first time in the Balearic Islands, including two that are also new records for Spain. We did not find statistically significant differences in the prevalence of ectoparasites or feather mites between sedentary and migratory birds. Likewise, no significant differences were observed in feather mite prevalence among migratory birds from Illa de s’Aire between prenuptial and postnuptial migrations. This study provides valuable insights into the prevalence and diversity of ectoparasites, shedding light on their potential role as vectors for avian pathogens. Further research is needed to explore the pathogens these ectoparasites may carry and transmit, contributing to a better understanding of the epidemiology of avian diseases in Menorca.

We applied 2 methods of phylogenetic regionalization (evoregions and phyloregions) for the distributions of fleas and their rodent hosts across Mongolia. We investigated the congruence between these 2 regionalization schemes and their alignment with physiographic and ecological subdivisions of Mongolia. We identified evoregions and phyloregions for both fleas and hosts. Ancestral regional distributions were reconstructed, and a phylogenetic correspondence analysis identified key contributing lineages. Using the V-measure, we tested for the congruence between (a) evoregions or phyloregions identified for fleas and evoregions or phyloregions, respectively, identified for their hosts and (b) evoregions and phyloregions identified for either fleas or hosts and each of the physiographic/ecological regionalization schemes of Mongolia. Four evoregions and 8 phyloregions were identified for both fleas and hosts, exhibiting distinct spatial patterns. Host-parasite regionalizations demonstrated moderate spatial similarity (V-measure 0.49–0.50), a significantly higher congruence than previously reported at the larger Palearctic scale (0.33). Flea regionalizations exhibited stronger congruence with environmental schemes than did host regionalizations. We concluded that evoregionalization and phyloregionalization capture distinct evolutionary signals, reflecting the role of in situ diversification vs. phylogenetic turnover resulting from dispersal. Host-parasite co-regionalization is scale-dependent, with increased congruence at regional scales. Despite adult fleas’ obligate host dependence, their regionalization is not merely a passive reflection of host biogeography but is also profoundly shaped by environmental conditions. These findings emphasize the importance of method choice, scale and eco-evolutionary interactions in shaping complex biogeographic patterns.

Urogenital schistosomiasis has 2 gender-specific manifestations, male genital schistosomiasis (MGS) and female genital schistosomiasis (FGS). The burdens of MGS and FGS are multifaceted, encompassing financial hardship, emotional and mental health problems and sometimes social stigmatization. Given the pernicious nature of sequelae in the genitalia, managing these chronic health conditions is expensive, difficult and problematic in resource poor settings. Key challenges include lack of epidemiological data on the burden of MGS and FGS, inadequate knowledge among primary and auxiliary health care workers, leading to misdiagnosis, incorrect treatment administration, e.g. overuse of antibiotics, and a lack of appropriate point-of-care diagnostic equipment. Prevention of MGS and FGS is therefore more preferable, however, current preventive programmes and chemotherapy campaigns offering praziquantel are becoming more resource constrained and in most endemic areas are not reaching at-risk adults (and adolescents), sufficiently. Furthermore, there are limited prospects for adequate access to treatment in pre-school children where infections can be first acquired. Therefore, we propose 3 key recommendations guiding movement towards elimination of schistosomiasis as a public health problem: scaling-up praziquantel treatment for other at-risk groups; developing a targeted One Health approach to reduce environmental transmission in both humans and animals; Multi-stakeholder collaboration and community engagement for effective implementation of Water Sanitation and Hygiene components of disease control. Whilst maintaining a school-based approach is still foundational, targeted and sustainable expansion of preventive chemotherapy to other at-risk groups within communities is needed to secure real prospects in elimination of genital schistosomiasis as a public health problem in Africa.

The prevalence of female genital schistosomiasis (FGS) and male genital schistosomiasis (MGS) remains high in many low-to-medium-income countries, and each has sex-specific disease sequelae with wider detrimental gender and health impacts. Social science research studies on the former outnumber those on the latter. Indeed, in many countries across sub-Saharan Africa (SSA), MGS (as with male reproductive and sexual health issues in general) is overlooked, underappreciated, and broadly orphaned within urogenital and intestinal schistosomiasis research and control. Similarly, in those countries where MGS has been reported formally, its psychosocial dimensions and effects remain poorly understood, especially in terms of context-specific cultural and societal factors. In this scoping review, we attempt to better contextualize MGS within men’s sexual and reproductive health and rights (SRHR) and general wellbeing, as it often draws parallels with social science research in FGS. We discuss common psychosocial determinants, highlighting why current surveillance of MGS is particularly poor and the primary health care response to mitigate it is bottlenecked and largely stalled within the wider health system, from both top-down and bottom-up perspectives. Our specific approach remains cognisant of the context of infected households where all members could be suffering from urogenital and/or intestinal schistosomiasis. Looking ahead, we develop and frame a pragmatic social science research agenda to encourage and better explore and assess the detrimental impact of MGS on infected men and boys, considering appropriate ameliorations more holistically within primary care.

Parasite transmission can be disrupted when their free-living larval stages are consumed by non-host organisms. Yet, the contribution of benthic scrapers to this process remains insufficiently explored. Here, we experimentally assessed the ability of the North American pulmonate snail Physa acuta to reduce the abundance of free-living digenean larvae – cercariae of Diplostomum sp. and Trichobilharzia sp., and adolescariae of Notocotylus sp. – and evaluated how this effect is modulated by snail body size and colonisation by other organisms. Larval consumption by P. acuta occurred in all treatments and was highest for settled Notocotylus sp. adolescariae, particularly among larger individuals. The extent of larval reduction varied with infection by digenean metacercariae (xiphidiometacercariae), which either enhanced or inhibited feeding depending on parasite identity. It also varied with colonisation by Chaetogaster limnaei limnaei, whose presence increased the ingestion of planktonic cercariae, likely due to the combined feeding activity of the snail and its commensal oligochaete. Most snails harboured metacercariae, indicating that P. acuta frequently functions as a second intermediate host in its non-native range. Our findings highlight the dual ecological role of P. acuta – both as a consumer of free-living parasite stages and as a competent host. This trophic interaction may disrupt parasite transmission while providing nutritional benefits that support the ecological success and spread of this non-native species. Conversely, by serving as a host, P. acuta may facilitate the persistence and dissemination of parasitic taxa in invaded ecosystems.