Anochetus emarginatus

Brown, WL Jr.,, 1978, Contributions toward a reclassification of the Formicidae. Part VI. Ponerinae, tribe Ponerini, subtribe Odontomachiti. Section B. Genus Anochetus and bibliography., Studia Entomologica 20, pp. 549-638 : 609-611

publication ID

6757

DOI

https://doi.org/10.5281/zenodo.6284165

persistent identifier

https://treatment.plazi.org/id/4135C249-7EB4-4192-C3CB-B7C163EE9830

treatment provided by

Donat

scientific name

Anochetus emarginatus
status

 

[36] Anochetus emarginatus View in CoL View at ENA   HNS

So far, A. emarginatus   HNS is known only from the Amazon Basin and northward in South America to the Caribbean Coast of Colombia (Parque Tayrona, Magdalena, C. Kugler, and Serrania de Macuira, Guajira Peninsula, W. L. Brown and C. Kugler) and to Trinidad in the east (numerous collections, mainly by N. A. Weber). Although I have taken it several times N and NE of Manaus, I have never found it in the far west of Brasil, in the Tingo Maria area of Amazonian Peru, or the Villavicencio region of cisandean Colombia, and I think it m,ust be rare or local there, if it occurs at all in the western Amazon. Kempf (1972: 21) does record it from as far west as the state of. Rondonia in Brasil: Porto Velho (W. M. Mann).

It is very variable in color and sculpture, but the head is always lighter than the trunk and gaster, contrasting with them. The pronotum may be coarsely or finely striate, usually in a transverse direction, or arched around the front of the disc, but often a greater or lesser part of the disc is smooth and shining (virtually the entire pronotum in a specimen from the Guajira Peninsula of Colombia).

I agree with Kempf (1964: 238) that Emery’s subsp. rugosus   HNS does not represent a separate population in this welter of variation.

Outside of continental South America, in the Caribbean area, the emarginatus   HNS complex is represented by a few variants that seem to be distributed allopatrically or parapatrically to one another; i.e., they may behave as unit species of a superspecies. The trouble is that we have very poor samples of most of these forms, and their status remains vague and uncertain in some cases. I am treating them more or less arbitrarily as species here.

A. testaceus   HNS : That this is a species apart from emarginatus   HNS is indicated by the sharp distinction between their male aedeagi (figs. 74 and 76), at least as shown in worker-associated samples from Grenada Island, which are assumed to be conspecific with the types from nearby St. Vincent. The real problem with testaceus   HNS concerns how many of the circum-Caribbean samples that are more or less similar to it in worker characters really belong to it.

The Culebra I. sample assigned by Wheeler (1908) to testaceus   HNS is really a distinct species, described [37] as A. kempfi   HNS . The variety nicans, described by Forel from the mountains, of Costa Rica, is similar to A. testaceus   HNS in its light ferruginous color, but has more complete striation; its male is unknown. Similar forms from Belize (former British Honduras) in MCZ may belong with very small males, only about half the size of the Grenadan males, but with somewhat similar terminalia. However, these males (from light traps at Hummingbird Gap) are not securely associated with workers, and I do not see what we can safely conclude from them until we know their workers.

Two large workers from the Bonacca Islands, Honduras (M. Bates) have smooth centers to their pronotal discs and smooth upper front faces to the petiolar nodes, and much like typical testaceus   HNS from Grenada, but we do not have their males. Likewise, a short series of workers from Nassau, New Providence, Bahamas, are rather extensively striate and have slightly smaller eyes than the Grenada series, but we do not have their males.

Thus, the relationship of testaceus   HNS to its Central American and Bahamian vicariants is unknown. My provisional «solution» to this problem is to treat the St. Vincent-Grenada testaceus   HNS as one relatively secure species with known male characters. The rest of the Costa Rican, Belizean, Hondurian and Bahamian samples are arbitrarily assigned to A. micans   HNS , which is considered as a «form-species» of temporary convenience.

The name A. striatulus   HNS is also provisionally applied to the dark brown, very finely striolate form described by Emery under that name as a subspecies of A. emarginatus   HNS from Jimenez, in the Atlantic lowlands of Costa Rica. This form, with posterior pronotal disc smooth and shining, has been recaptured in the forest at Rio Toro Amarillo, near Guapiles (W. L. Brown), which is also in the Atlantic lowlands of Limon Province. It may be a separate species; further collections, especially of nests with males, are needed to assess its status.

Possibly some or all of the Central American forms here discusseci (at least the workers) are actually geographical variants of A. emarginatus   HNS or A. testaceus   HNS , but it is clear that we cannot settle this problem without more evidence.

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Formicidae

Genus

Anochetus

GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF