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This species occurs in cloud forest, at 1500 m elevation. It is known from one site on the Barva Transect in Costa Rica, where it occurred in 5 of 200 miniWinkler samples.
Diagnosis. Sharing with R. subspatulata and R. weberi a characteristic labrum shape: anterior margin of labrum with two long, bluntly triangular lobes, sinus between them deep, length of anterolateral lobe longer than or about equal to distance from base of sinus to transverse carina at base of labrum; differing from both in larger size (HW = 0.57 versus < 0.50); differing from R. weberi in subapical tooth longer than apical tooth (about same length in R. weberi); differing from R. subspatulata in larger number of squamiform setae on first gastral tergite (about 12 versus about 6).
Description. Worker. HW 0.57 (n=1); mandible with two closely-spaced short triangular teeth at base, a smaller tooth about mid-distance between basal teeth and base of subapical tooth, reclinate denticle at base of subapical tooth minute but present, apical tooth half the length of subapical tooth, intercalary teeth minute; labrum about as long as broad, with two long, bluntly triangular lobes, sinus between them deep, length of anterolateral lobe longer than or about equal to distance from base of sinus to transverse carina at base of labrum; erect setae on leading edge of scape moderately clavate, longest on basal bend, becoming shorter and thinner toward apex; arcuate promesonotal groove and metanotal groove moderately impressed; propodeal tooth right angled, infradental lamella evenly and shallowly concave; first gastral tergite with 6–8 squamiform setae on posterior margin, a similar number distributed between posterior border and midlength of tergite.
The male is unknown.
This is a slightly more robust version of R. subspatulata. Among several other species of Rhopalothrix considered in this report, this degree of difference would be considered intraspecific. However, the sharply parapatric distribution on the Barva transect and the low variability among the many lowland collections of R. subspatulata suggest a separate montane species.
Found most commonly in these habitats: 6 times found in montane wet forest, 1 times found in cloud forest.
Found most commonly in these microhabitats: 1 times Hojarasca, pasture edge, 2 times Hojarasca, mature forest, dropping, 2 times Hojarasca, 1 times ex sifted leaf litter, 1 times Hojarasca, mature forest, climb out of stream.
Collected most commonly using these methods: 6 times Mini Winkler, 1 times maxiWinkler.
Elevations: collected from 1500 - 1560 meters, 1513 meters average