Revision of the Malagasy Camponotus subgenus Myrmosaga (Hymenoptera, Formicidae) using qualitative and quantitative morphology Rakotonirina, Jean Claude Fisher, Brian L. ZooKeys 2022 2022-05-03 1098 1 180 http://zoobank.org/3C81BF3C-27C7-476A-889D-F2DD66EE7E55 Rakotonirina & Fisher, 2022 Rakotonirina & Fisher 2022 Insecta Formicidae Camponotus CoL Animalia Camponotus aro Hymenoptera 0 1 Arthropoda species aro sp. nov.   Figs 25B , 31B , 41  Holotype worker.  Madagascar: Province Mahajanga: PN de Namoroka, 17.8 km 329° WNW Vilanandro, -16.37667, 45.32667, 100 m, dry forest, under stone, 08 Nov 2002 (Fisher, Griswold et al.) collection code: BLF06542, specimen code: CASENT0489917 (CAS).  Paratypes. 2 minor workers and 1 major worker with same data as holotype but with specimen codes: CASENT0837586, CASENT0837587, CASENT0489918 (NHMUK, MHNG, CAS).  Additional material examined.    Madagascar: Mahajanga: PN Namoroka, 16.9 km317° NW Vilanandro, -16.40667, 45.31,  100 m, tropical dry forest (Fisher, Griswold et al.) (CAS); PN Namoroka,  17.8 km329° WNW Vilanandro, -16.37667, 45.32667,  100 m, tropical dry forest (Fisher, Griswold et al.) (CAS).  Diagnosis. With head in full-face view, lateral margins of head anterior to eye level parallel, lacking erect hairs, lateral cephalic margin rounding to posterior margin, anteromedian clypeal margin continuously forming broad convexity; propodeal dorsum immediately posterior to metanotal groove convex, then concave medially and rounding to declivity surface.  Description.  Minor worker.In full-face view, head widest at midlength; lateral margins posterior to level of eye, rounding evenly to posterior margin; eye protruding and large (EL/CS: 0.25 +/-0.01; 0.23-0.26), not breaking lateral cephalic margin; level of its posterior border located at ca. posterior 1/3 of head (PoOc/CL: 0.28 +/-0.01; 0.27-0.30); frontal carinae posteriorly parallel (FR/CS: 0.25 +/-0.01; 0.24-0.27); clypeus without anterolateral angle, its anteromedian margin broadly convex; mandible with six teeth, its two apical teeth distantly spaced; antennal scape relatively long (SL/CS: 1.59 +/-0.08; 1.46-1.71). Mesosoma long and low (MPH/ML: 0.28 +/-0.01; 0.26-0.30), promesonotum weakly convex, mesonotum with posterior portion flat immediately anterior to a weakly visible metanotal groove; propodeal dorsum anteriorly convex, with feeble concavity medially, dorsal margin of propodeum rounding to declivity; propodeal dorsum 2 xas long as declivity. Petiolar node nodiform; with dorsal margin inclined posteriorly and forming a blunt angle to anterior face; anterior face of petiolar node 1/2 height of posterior face; femur of hind leg rounded axially and twisted basally. First and second gastral tergites with a pair of white spots; erect hairs on lateral margin of head absent; two erect hairs present near posterior margin of head; antennal scape only covered with appressed hairs; pronotum with a pair of erect hairs; posterodorsal angle of propodeum with a pair of erect hairs.  Major worker.Differing from minor worker in the following characters: enlarged head (CS: 3.10 +/-0.18; 2.82-3.29; CWb/CL: 0.92 +/-0.01; 0.90-0.94) with markedly concave posterior margin; apical 1/3 of antennal scape extending beyond posterior cephalic margin; robust mesosoma with propodeal dorsum slightly concave and its length ca. 2 xheight of declivity; petiole tapering dorsally.  Distribution and biology. Geographically restricted to the PN Namoroka in the western dry forest of Madagascar (Fig. 41D),  C. arohas been found nesting under stones while workers forage on the ground or through leaf litter and on lower vegetation.   Figure 41.  Camponotus aro Alateral view Bhead in full-face view Cdorsal view of holotype minor worker CASENT0489917 Ddistribution map.  Discussion.   Camponotus arois morphologically similar to  C. gouldiin that both species are characterized by a broadly convex anteromedian margin of clypeus, but the latter species is diagnosed as having a head that extends posteriorly into a broad, short neck and its propodeal dorsum is straight. The definition for  C. arois supported by the congruence between the results of traditional qualitative morphology and the NC-clustering technique. The classification of the samples for the species is at 100% success.  Etymology. The species name arois a non-Latin singular noun used in apposition. 2022-01-01 2022-12-31 2022-01-01 PN Namoroka Madagascar 100 -16.37667 Vilanandro 1 45.32667 1 Mahajanga