Differential Hematotoxic Activity of Southeast Asian Pit Viper Venoms: The Cross-Neutralizing Effect of Available Antivenoms

  Image Credit: Creative Commons (some rights reserved) CC BY-NC Photo 111998430, (c) Nicholas Hess Differential Hematotoxic Activity of Southeast Asian Pit Viper Venoms: The Cross-Neutralizing Effect of Available Antivenoms Abstract Background/Objectives : Pit vipers (subfamily Crotalinae) are responsible for a large proportion of snakebite envenoming cases in Southeast Asia. Envenomation by these snakes commonly causes hematotoxic effects, including platelet dysfunction and coagulation disturbances. Although antivenom remains the mainstay of treatment, species-specific antivenoms are not available for several regional pit viper species. This study evaluated the hematotoxic activities of selected Southeast Asian pit viper venoms and the cross-neutralizing capacity of commercially available antivenoms.  Methods : Venoms from five medically important pit viper species— Calloselasma rhodostoma ,  Trimeresurus albolabris ,  T. hageni ,  T. purpureomaculatus , ...

Unusual Encounter: First Photographic Documentation of a Lynx Spider Oxyopes sp. (Araneae: Oxyopidae) Preying on Serangium parcesetosum Sicard, 1929 (Coleoptera: Coccinellidae) from India

 


Unusual Encounter: First Photographic Documentation of a Lynx Spider Oxyopes sp. (Araneae: Oxyopidae) Preying on Serangium parcesetosum Sicard, 1929 (Coleoptera: Coccinellidae) from India

Predator-prey interactions play a key role in structuring arthropod communities, and spiders are among the most abundant and diverse predators influencing these dynamics (Lang 2003; Birkhofer et al. 2013). Their predation strategies vary widely, from web-building to active hunting, enabling them to exploit a broad spectrum of prey types (Cardoso et al. 2011). Ladybird beetles (Coleoptera: Coccinellidae), well known as effective predators of aphids and other sap-sucking pests, possess several defenses including aposematic coloration, chemical secretions and a hardened cuticle that generally reduce their vulnerability to predators (Moore et al. 1990; Daloze et al. 1995; Ceryngier et al. 2012). Despite these adaptations, predation on ladybirds has been reported from a variety of vertebrate and invertebrate predators, though documented cases involving spiders are relatively few. Existing reports primarily concern web-building spiders that capture beetles incidentally in their webs (Nentwig 1983; Sloggett 2010). In contrast, actively hunting spiders seldom attack coccinellids, largely due to the beetles' thick exoskeleton and defensive chemistry (Nentwig 1986; Nyffeler 1999). These factors make any verified instance of a non-web-building spider successfully preying upon a ladybird beetle an event of particular ecological interest. Only a green lynx spider, Peucetia viridans Hentz, 1832 has been reported to prey upon Harmonia axyridis Pallas, 1773 in Florida, USA (Ceryngier et al. 2018). This makes the successful predation of a ladybird beetle by a lynx spider particularly intriguing.

During a field survey in February 2025, conducted in the guava orchards of the ICAR-AICRP on Fruits Research Unit, Mondouri, Bidhan Chandra Krishi Viswavidyalaya, Nadia, West Bengal, India (22°56′08.3″ N, 88°30′27.4″ E), a predation event was observed involving the coccinellid beetle Serangium parcesetosum Sicard, 1929 (Coccinellidae: Microweiseinae: Serangiini) and a lynx spider (Oxyopes sp.) (Araneae: Oxyopidae). An adult S. parcesetosum was actively foraging on guava leaves infested with whiteflies when it was attacked by a lynx spider resting on a nearby leaf margin. The spider swiftly captured and subdued the beetle (Figure 1).

Field images were captured using Samsung S22 Ultra smartphone. Ladybird Species identification was done using a Zeiss Stemi 508 stereomicroscope guided by the protocols of Poorani (2024). The spider was identified following Gajbe (2008).

Tamoghno Majumder, Shashank Shekhar, Kusal Roy, Souvik Sen "Unusual Encounter: First Photographic Documentation of a Lynx Spider Oxyopes sp. (Araneae: Oxyopidae) Preying on Serangium parcesetosum Sicard, 1929 (Coleoptera: Coccinellidae) from India," Entomological News, 133(2), 207-211, (15 March 2026) https://doi.org/10.3157/021.133.0214