Honduras’s Poorly Known Whip Spiders: Seven Species, Many Open Questions

Tailless whip scorpions are among the most instantly recognisable arachnids on Earth: flattened, crab-bodied animals that prowl tropical nights on stilt-like legs, feeling their way with a pair of antenniform forelimbs far longer than their own bodies. Despite their fearsome appearance, the roughly 260 known species of the order Amblypygi are non-venomous predators of insects and other small arthropods, and some live quietly in urban homes as well as humid forests and caves. Yet in parts of Central America, even the basic inventory of these animals remains unfinished. A new review published in Neotropical Biology and Conservation by Cuban arachnologist Luis F. de Armas and Honduran colleague Edgardo Cubas-Rodríguez takes stock of Honduras’s amblypygid fauna and finds a country whose whip spiders are, in the authors’ words, in need of study.

The scale of the gap is striking. Central America as a whole harbours fourteen amblypygid species, about five percent of the world total, and Honduras accounts for seven of those fourteen — half the region’s known diversity. Only one family, Phrynidae, is confirmed for the country, represented by the genera Paraphrynus and Phrynus. But of the seven Honduran species on the books, just four have been positively identified: Paraphrynus laevifrons, Phrynus palenque, Phrynus similis and the widespread Phrynus whitei. The remaining three records rest on specimens or photographs whose species-level identity is unresolved, and one of them may not even belong to the species under whose name it was first published.

The historical record is a tangle of misidentifications, which the review carefully unpicks. The first explicit mention of a Honduran whip spider came in 1975, when C. L. Mullinex recorded Paraphrynus raptator from a female collected at La Lima in Cortés Department and a male from Útila Island. Later workers added Olancho Department to that species’ putative range. But a 2017 paper suggested those three records may actually correspond to Paraphrynus maya, a species described from north-eastern Guatemala near the Honduran border. The review accordingly lists the material as Paraphrynus sp. pending re-examination, a small taxonomic housekeeping with real consequences: without correct names, nothing can be said about a species’ true range or conservation needs.

The best-known Honduran amblypygid is Phrynus whitei, a synanthropic species distributed from Mexico to Costa Rica and recorded from eight Honduran departments, from Cortés on the Caribbean coast to Choluteca and Valle in the south. First noted in the country by D. J. Quintero in his 1981 revision of the genus, it has now been photographed in the Rio Plátano Biosphere Reserve in Gracias a Dios Department, extending its documented range on the basis of citizen-science imagery from the stock-photo service Alamy. The review leans heavily on such sources: alongside 21 published works, the authors combed iNaturalist, Flickr and Alamy for identifiable photographs, a method increasingly productive for conspicuous arachnids in under-surveyed countries.

Island caves yielded the most unexpected record. Phrynus palenque, known from southern Mexico, Belize, Guatemala and Honduras, entered the Honduran list on the strength of a single adult female collected by H. Peters in 1951 in a cave on Útila Island. The specimen, housed at the Senckenberg Museum in Germany, was mislabelled by Carl F. Roewer in 1954 as Paraphrynus laevifrons — alongside an unidentified Heterophrynus, a genus never confirmed from Honduras at all. Recent iNaturalist photographs from Útila and Roatán leave no doubt that Ph. palenque lives on both islands, making it the only Honduran amblypygid documented from a cave habitat.

The mountains hold a different surprise. Phrynus similis, described in 2013 from Guatemala and Honduras, appears in central Honduras restricted to the Tilarán range at 1,600 to 1,700 metres elevation, where a photograph from San Antonio de Oriente shows a female carrying roughly ten prelarvae — rare published evidence of reproduction in the country’s fauna. The review also flags a suspicious record from the Swan Islands, Honduran territory in the Caribbean, where Quintero recorded the Cuban species Phrynus damonidaensis. Such a disjunct distribution is unusual, and the authors suspect misidentification, listing the population as Phrynus sp. aff. damonidaensis.

Natural-history data remain thin. Habitat notes exist for every species except the Swan Islands form, but predation has been observed only once, involving Phrynus whitei. More intriguing is the evidence of parasitism: a fly tentatively identified as Pseudogaurax, a chloropid, was photographed parasitising an amblypygid egg clutch near Lake Yojoa, and a second instance was documented by naturalist Court Harding. Dipteran egg parasitoids have been recorded for other Neotropical phrynids, but each new observation helps sketch the ecological web in which these animals sit — a web otherwise almost undocumented in Honduras.

Conservation assessments are, for now, essentially impossible. No Honduran amblypygid is endemic as far as anyone knows, but the authors note that unpublished data suggest two or three undescribed species may be restricted to the country. Four of the confirmed species do occur in protected areas: a Paraphrynus, likely P. williamsi, in Cusuco National Park; Phrynus palenque in Islas de la Bahía National Park; Phrynus similis in La Tigra National Park and the Uyuca Biological Reserve; and Phrynus whitei in Pico Bonito National Park and the Rio Plátano Biosphere Reserve. Whether those boundaries capture viable populations is unknown, because nothing is known about population sizes, threats or trends for any species.

The review is less a conclusion than a starting gun. Since January 2023 the authors have run a long-term project on Honduran amblypygids aimed at resolving the taxonomic composition, distribution and natural history of the fauna, and they are explicit that fieldwork and revisionary study are the only way forward. The obstacles are typical of Central American arachnology: few specialists, scattered museum material, decades of misapplied names and a heavy reliance on chance photographs. But the payoff is equally clear. Half of Central America’s whip-spider fauna lives in Honduras, some of it possibly nowhere else, and the country’s humid forests, islands and caves almost certainly hold species still awaiting a name. For a group as charismatic and as harmless as the tailless whip scorpions, the Honduran fauna has now, at least, been formally placed on the map — with the map still mostly blank.

Subject of Research: Taxonomic review of the tailless whip spider (Amblypygi) fauna of Honduras

Article Title: The poorly-known amblypygid fauna ( Arachnida , Amblypygi ) of Honduras, Central America: an overview

Article References: de Armas, L. F., & Cubas-Rodríguez, A. M. (2024). The poorly-known amblypygid fauna (Arachnida, Amblypygi) of Honduras, Central America: an overview. Neotropical Biology and Conservation, 19(2), 187-198. https://doi.org/10.3897/neotropical.19.e113507

Image Credits: AI Generated

DOI: 10.3897/neotropical.19.e113507

Keywords: Amblypygi, whip spiders, Honduras, arachnology, Phrynidae, Phrynus, Paraphrynus, taxonomy, Central America, biodiversity, citizen science, conservation