Procryptocerus batesi

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Procryptocerus batesi
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Hymenoptera
Family: Formicidae
Subfamily: Myrmicinae
Tribe: Attini
Genus: Procryptocerus
Species: P. batesi
Binomial name
Procryptocerus batesi
Forel, 1899

Procryptocerus batesi casent0280784 p 1 high.jpg

Procryptocerus batesi casent0280784 d 1 high.jpg

Specimen Labels

Synonyms

Most collections are of foraging workers obtained from montane wet forest on low vegetation or in the canopy. No collections are known from below 600 m elevation. Workers are often observed in recent treefalls. Procryptocerus batesi appears to be very similar to Procryptocerus mayri in its habitat preference and nesting habits (see P. mayri for details). Nests contain fewer than 100 workers and may be found in live or dead stems. Colonies appear to be monogynous. Polydomy probably occurs because queenless nests can be found. (Longino and Snelling 2002)

Identification

Longino and Snelling (2002) - In the mountains of southern Central America and South America, a complex of species occurs that have (1) the frontal carinae separate from the torulus, passing above it and onto the clypeus; (2) the face sculpture varying from completely striate to strongly clathrate (composed of high, sharp, well-separated rugae, which form irregular polygons over face surface); and (3) the first gastral tergite varying from striate to completely smooth and shining. The complex occurs as a series of allopatric populations restricted to montane forests. There is abundant material from Costa Rica, which reveals the presence of two sympatric species. The populations in Costa Rica and western Panama are peripheral isolates, with the nearest neighbors being populations in the Colombian Andes. Collections occur from Venezuela, through Colombia and Ecuador, south to Peru, but they are too few to draw conclusions about communities of sympatric species or the nature of character variation. Character variation is high even within Costa Rica, and discordant character variation occurs across the material from South America. Each local mountain range may host a unique community, shaped by a combination of dispersal history, local selection, and perhaps hybridization. As a result, a clear taxonomy of these forms may be elusive.

A discrete character that separates sympatric forms in Costa Rica is the presence or absence of a torulus trough. The torulus trough is an effect of the shape of the lateral portion of the clypeus. In specimens lacking a trough, the lateral portion of the clypeus falls perpendicularly to the torulus, such that in anterior view (looking at the head with mandibles forward) the torulus is relatively exposed. In specimens with a trough, the lateral clypeus is somewhat produced, such that it falls to the torulus at an acute angle, and in anterior view, the torulus is relatively obscured by the lateral ‘‘wings’’ of the clypeus. South American material exhibits a full range of states for this character, from no torulus trough to a deep, pronounced one.

Figure 2. Torulus, clypeus, and frontal carina complex for Procryptocerus batesi (left) and P. mayri (right).

Current available names in this complex are Procryptocerus carbonarius from Colombia; Procryptocerus rudis from Colombia; P. batesi from Colombia; Procryptocerus laeviventris from Panama; Procryptocerus mayri from Colombia; Procryptocerus reichenspergeri from Brazil; and Procryptocerus virgatus from Ecuador. Kempf synonymized P. laeviventris under P. carbonarius; the rest are currently valid. The type of P. laeviventris, from western Panama, clearly falls within the Central American group with the torulus trough. In Colombia, species boundaries are unclear, but we have examined the types of P. rudis, P. batesi, and P. carbonarius. All three of them have a torulus trough, but they vary in gastral sculpture and body size. The type of P. laeviventris most closely matches P. batesi, not P. carbonarius. Therefore, we have transferred it from P. carbonarius to P. batesi and identify as P. batesi the Central American material with a torulus trough. The types of P. mayri and P. reichenspergeri match the Central American species that lacks a torulus trough. Procryptocerus virgatus, from Ecuador, has a weak torulus trough. It and other material from Ecuador and southern Colombia exhibit variation in the torulus trough that blurs the distinct character states found in Central America.

Keys including this Species

Distribution

Distribution based on Regional Taxon Lists

Neotropical Region: Colombia (type locality), Costa Rica, Honduras, Mexico, Panama.

Distribution based on AntMaps

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Distribution based on AntWeb specimens

Check data from AntWeb

Biology

Longino and Snelling (2002) - The following data on nest collections are extracted from field notes, all from Costa Rica.

Longino, 23–24 Jul 1984, Rio Penas Blancas An entire nest was collected in a hollow, living stem of an epiphytic shrub, 20 m high in a Guarea tree. The nest contained 55 adult workers, 1 dealate queen, 1 adult male, 3 pupae, 13 large larvae, and a small amount of smaller brood.

Longino #1601, Casa Eladio, Rio Penas Blancas An entire nest was collected from one internode of a Cecropia insignis sapling. The nest contained 87 adult workers, 58 pupae, 10 prepupae, 18 large larvae, and a few small larvae and eggs.

Longino #2356, Cerro Cacao An entire nest was collected from a dead branch. The nest contained 96 workers, 1 dealate queen, and brood.

Castes

Nomenclature

The following information is derived from Barry Bolton's New General Catalogue, a catalogue of the world's ants.

  • batesi. Procryptocerus batesi Forel, 1899c: 43 (footnote) (w.) COLOMBIA. Longino & Snelling, 2002: 9 (q.). Senior synonym of laeviventris: Longino & Snelling, 2002: 8. See also: Kempf, 1951: 22
  • laeviventris. Procryptocerus carbonarius var. laeviventris Forel, 1899c: 47 (w.) PANAMA. Junior synonym of carbonarius: Kempf, 1951: 24; of batesi: Longino & Snelling, 2002: 8.

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

Worker

Longino and Snelling (2002) - (n = 1, Costa Rica): HW 1.281 (range 1.111–1.502, mean 1.28, n = 5), HL 1.266, SL 0.846, EL 0.329, MeL 1.709, MeW 0.986, PrW 0.651, PrL 0.424, PrS 0.33, PrT 0.758, MTL 0.966, MFL 1.074, MFW 0.365, PtL 0.462, PtW 0.420, PpW 0.529, PtH 0.364, AL 1.641, AW 1.360.

Head subtriangular in outline, margin of vertex roughly straight; frontal carina extends onto clypeus, separated from and passing above torulus as a continuous flange; clypeus produced anteriorly and torulus recessed, with distinct trough anterior to torulus; face to margin of vertex with widely spaced sharp rugae, which form areolae over entire surface or at least peripherally and with various degrees of of antennal insertions abruptly bent ventrad; clypeus with prominent median longitudinal carina, flanked with 3–4 longitudinal carinae on each side; lateral carinae of variable strength; genae varying from longitudinally rugose to coarsely foveate/areolate; genal bridge longitudinally striate; mandible with coarse longitudinal stria; eyes nearly symmetrically convex; scape flattened with thick lateral margin distally, becoming narrower and more terete basally, then flaring into a basal flange; broad flat surface of scape finely areolate, outer lateral margin with coarse rugae; margin of vertex obtuse, weak, obsolete medially; vertex shiny with coarse, longitudinal striae radiating from occiput (of highly variable strength).

Mesonotal lobes short, acute, upturned; propodeal suture broadly, shallowly impressed, not breaking sculpture; anterolateral propodeal lobes obsolete or with indistinct, small obtuse teeth a short distance posterior to anterolateral margin; pronotum reticulate rugose, coarsely areolate anteriorly; in some specimens rugae somewhat longitudinally parallel on mesonotum; dorsal face of propodeum reticulate rugose to longitudinally striate, with 8–10 striae; posterior face of propodeum meeting dorsal face at obtuse angle; posterior face of propodeum completely smooth and shining on ventral one half or more; one or two transverse striae dorsally, between bases of propodeal spines, or longitudinal striae extend a short distance onto posterior face; dorsal half of side of pronotum coarsely areolate-foveate; ventral half with 4–5 coarse longitudinal striae or reticulate rugose; anepisternum areolate-foveate or with 2–3 coarse longitudinal striae; katepisternum with #8 longitudinal striae, these smaller than or the same size as striae on lateral pronotum, or katepisternum reticulate rugose; when katepisternum striate, striae extend onto lateral propodeum; these propodeal striae degrade into reticulate rugosity posteriorly; posterior surface of forefemur entirely smooth and shining; outer surface of metatibia coarsely rugose.

Ventral margin of petiole flat, with anterior ventrally projecting right-angled tooth; anterodorsal face of petiole shiny with coarse to faint transverse striae (completely smooth in a few specimens); posterodorsal face areolate-foveate (weakly longitudinally rugose in some specimens); postpetiole with a long, gently sloping anterior face, a broad, rounded summit near the posterior margin, and a steeply sloping posterior face; ventral margin of postpetiole short, with a prominent, acute anterior tooth; dorsum of postpetiole coarsely foveate-rugose (weakly longitudinally rugose in some specimens); first gastral tergite completely smooth or with varying expression of irregular longitudinal striae (in Costa Rica, specimens from the Cordilleras de Guanacaste and Tilaran and the Atlantic slope of the Cordillera Central usually lack striae on the first gastral tergite; some collections from the Cordillera Central and a collection from the Cordillera de Talamanca have striae on the anterior portion; a specimen from the Osa Peninsula has striae on both anterior and posterior portions, with the disc smooth; a specimen from Estacion Carrillo, on the north slope of the Cordillera Central, has the entire surface striatopunctate); microsculpture composed of hexagonal plates, these ranging from distinctly visible to completely effaced; hexagonal plates flat; first gastral sternite largely microreticulate, nearly smooth; second gastral tergite with faint, dense, granular sculpture.

Abundant flexuous setae on face, mesosomal dorsum (.20 on central area of promesonotum, not including those on lateral margins), petiole and postpetiole, and gaster; color shining black, with appendages gradually fading to dark brown distally.

Queen

Longino and Snelling (2002) - dealate, Monteverde, Costa Rica: HW 1.45, HL 1.37, SL 0.89, EL 0.35, MeL 2.13, MeW 1.26, MTL 1.09, PtL 0.56, PtW 0.46, PpW 0.64, PtH 0.42, AL 1.85, AW 1.62.

Head subtriangular in dorsal view, margin of vertex somewhat erose, well-defined laterally, obscure medially, such that the margin appears cordate. In lateral view, scrobe extends straight back almost to vertex margin, then abruptly bends ventrally. Vertex shiny, with approximately 20 carinae radiating from occipital foramen. Interior of scrobe shiny. Frons coarsely areolate, as in worker. Clypeus sharply bent in the middle, such that the anterior half is perpendicular to the frons. Clypeus with approximately eight sharp longitudinal carinae, which diverge anterior to the bend, leaving a deep anteromedian depression with transverse rugae and a dense tuft of golden setae. Genae similar to frons, genal bridge longitudinally striate. Mandibles with basal and masticatory margins meeting at a sharp right angle, apex of masticatory margin with three teeth of progressively smaller size, followed by two small denticles, lower half of masticatory margin completely edentate, flat. Outer surface of mandibles longitudinally striate. Scape with enlarged basal tooth extending down over neck and condyle, lower shaft subterete, becoming broader and flattened distally. Scape minutely alveolate, with outer margin faintly rugose.

Pronotum, axillae, scutellum, and dorsal face of propodeum coarsely areolate as on frons, mesoscutum tending more to discrete foveae. Posterior face of propodeum smooth and shiny except for 1–2 transverse carinae between spine bases. Sides of pronotum grading into coarse longitudinal striae. Similar striae covering dorsal half of katepisternum, extending about halfway across the propodeum; rest of sides of mesosoma, including anepisternum, coarsely areolate. Forecoxae transversely striate, meso- and metacoxae unsculptured. Propodeal spines triangular, just under half the length of the dorsal face of the propodeum. Femora strongly swollen medially, spindle-shaped. Exterior surfaces of tibiae longitudinally rugose-areolate, rest of legs smooth and shining.

Petiole elongate with gently convex dorsal surface, ventral surface concave, with small anterior tooth. Postpetiole with short, stout anteroventral tooth. Anterior face of petiole shiny with a few transverse striae. Posterior face of petiole and dorsum of postpetiole coarsely areolate; gaster completely unsculptured except for sparse, minute piligerous puncta, and very narrow traces of rugae at the margins of terga and sterna.

Body and appendages completely covered with short, filiform setae; first gastral tergite also with sparse, very short subdecumbent setae; color uniformly black.

Type Material

Longino and Snelling (2002) - Lectotype worker: Colombia (Landolt) Musee d'Histoire Naturelle Genève (examined).

References