Gloyd’s Moccasin

Open encyclopedia reference

Agkistrodon howardgloydi is a species of venomous snake, a pit viper in the subfamily Crotalinae of the family Viperidae. The species is endemic to Central America. It is most commonly called castellana, but it has also been called the southern cantil, Gloyd's moccasin, and a number of other colloquial names. It is a rare species with a relatively small geographic distribution in the tropical dry forest on the Pacific coast of Honduras, Nicaragua, and extreme northwest Costa Rica. A. howardgloydi is a stout, medium-sized snake with a maximum total length (including tail) of 96 cm (38 in). It is a viviparous species, with females giving birth in the rainy season from May to August. No clinical reports on envenomation had been published (as of 1999), but laboratory tests and analysis indicate the venom is highly toxic and similar to its close relative Agkistrodon bilineatus, and potentially lethal.

Wikipedia contributors, Agkistrodon howardgloydi; see linked history · CC BY-SA 4.0 . Plain-text lead excerpt, at most 180 words; no infobox or later sections Retrieved 2026-10-05T05:54:47.452876+00:00. This reference remains separate from the taxonomic record.

Identity & source status

Scientific name

Agkistrodon howardgloydi Conant, 1984

Name authority

Conant, 1984

Common name

Gloyd’s Moccasin

Rank

species

Accepted status

accepted

Kingdom

Animalia

Phylum

Chordata

Class

Reptilia

Order

Squamata

Family

Viperidae

Genus

Agkistrodon

Extinction status

Not supplied by this source

Classification family tree

Nested taxonomic groups from the source. This is not a direct-ancestor chain, a dated evolutionary tree or a phylogenetic reconstruction.

1. domainEukaryota (Chatton, 1925) Whittaker & Margulis, 1978
2. kingdomAnimalia
3. phylumChordata
4. subphylumVertebrata
5. infraphylumGnathostomata
6. parvphylumOsteichthyes
7. megaclassTetrapoda
8. classReptilia Laurenti, 1768
9. orderSquamata Oppel, 1811
10. suborderSerpentes Linnaeus, 1758
11. infraorderAlethinophidia Nopcsa, 1923
12. familyViperidae
13. subfamilyCrotalinae
14. genusAgkistrodon
15. speciesAgkistrodon howardgloydi Conant, 1984

Close classified relatives

These entries share the source’s genus, Agkistrodon. They are not necessarily the closest relatives established by molecular evidence.

Browse 244 records assigned to Viperidae.

Documented distribution

Source distribution statements, not a complete range map. A listed locality is not necessarily a place of origin.

Source literature & publication evidence

References attached to this source record, including nomenclatural citations where supplied. This is a selected bibliography; abbreviated citations remain in the source’s form.

1. https://reptile-database.reptarium.cz/species?genus=Agkistrodon&species=howardgloydi Source fields: Taxon.tsv dwc:namePublishedIn, Taxon.tsv dcterms:references

Origins, evidence & remaining research

Name authority and publication references document nomenclature where the source supplies it. They do not establish evolutionary origins or the earliest fossil occurrence.

Specimen-level evidence, morphology, ecological research, phylogenetic studies, a comprehensive bibliography and a located literary passage have not yet been compiled for this record.

Dataset citation & attribution

This exact taxon in ChecklistBank · Catalogue of Life 2026-09-11

Catalogue of Life 2026-09-11; dataset 316321; doi:10.48580/dgz5n. https://creativecommons.org/licenses/by/4.0/ . Retrieved 5 October 2026.

Stable key: col:5TRLG. Classification follows source parent identifiers. English common names may vary by region.