Uncovering cryptic diversity in the enigmatic ant genus Overbeckia and insights into the phylogeny of Camponotini (Hymenoptera: Formicidae: Formicinae) Author Klimeš, Petr Biology Centre of the Czech Academy of Sciences, Institute of Entomology, BraniŠovská 31, CZ- 370 05 České Budějovice, Czech Republic Author Drescher, Jochen Department of Animal Ecology, University of Göttingen, J. - F. - Blumenbach Institute for Zoology & Anthropology, Untere Karspüle 2, D- 37073 Göttingen, Germany Author Buchori, Damayanti Department of Plant Protection, Faculty of Agriculture, Bogor Agricultural University, Jl. Kamper, Kampus IPB Dramaga, Bogor 16680, Indonesia Author Hidayat, Purnama Department of Plant Protection, Faculty of Agriculture, Bogor Agricultural University, Jl. Kamper, Kampus IPB Dramaga, Bogor 16680, Indonesia Author Nazarreta, Rizky Department of Plant Protection, Faculty of Agriculture, Bogor Agricultural University, Jl. Kamper, Kampus IPB Dramaga, Bogor 16680, Indonesia Author Potocký, Pavel Biology Centre of the Czech Academy of Sciences, Institute of Entomology, BraniŠovská 31, CZ- 370 05 České Budějovice, Czech Republic Author Rimandai, Maling New Guinea Binatang Research Center, PO Box 604, Madang, Papua New Guinea Author Scheu, Stefan Department of Animal Ecology, University of Göttingen, J. - F. - Blumenbach Institute for Zoology & Anthropology, Untere Karspüle 2, D- 37073 Göttingen, Germany & Centre of Biodiversity and Sustainable Land Use, University of Göttingen, Büsgenweg 1, D- 37077 Göttingen, Germany Author Matos-Maraví, Pável Biology Centre of the Czech Academy of Sciences, Institute of Entomology, BraniŠovská 31, CZ- 370 05 České Budějovice, Czech Republic text Invertebrate Systematics 2022 2022-07-25 36 6 277 288 http://dx.doi.org/10.1071/is21067 journal article 10.1071/is21067 8c0715c9-57f5-40db-8c48-99bf3719eedb 6987297 Overbeckia jambiensis Klimes , sp. nov. ( Fig. 4 ) Etymology Named after the Jambi Province on Sumatra Island ( Indonesia ) where the type specimen was collected by J. Drescher in the lowland rainforest of Bukit Duabelas National Park (EFForTS project core plot BF2, see Drescher et al . 2016 ). Material examined Holotype : Worker ( MZB ): BF2.2/ 7.x.2013 / wet season/canopy fogging/lowland forest / Bukit Duabelas National Park / 01°58′54.2″S , 102°45′02.3″E /leg. J. Drescher (det. R. Nazarreta , P. Klimes ) Paratype : Worker ( ZMHB ):same data as above but marked as paratype . Diagnosis Overbeckia jambiensis workers are the hairiest of the Overbeckia species , with numerous conspicuous erect hairs present on dorsum of petiole, thorax, and also dorsally and ventrally on the head, abdomen and scape; head integument without punctation and with fine lineation; cuticle covered with sparse, short, appressed hairs that are less numerous but longer than in other species and present all over the head except in the area between the eyes and around carinae; integument darker and glossy; frontal carinae less approaching one another anteriorly compared to those of O. subclavata but curvature evenly convex when compared to those of the other species in frontal view ( Fig. 4 d ). Lineation present on whole lateral sides of mesosoma, including upper part of frontal coxae and the areas above metathoracic spiracle. Description of worker Morphometrics . Holotype ‘BF2.2.’ ( one paratype ): HL 1.37 (1.29), HW 1.29 (1.30), IOD 0.94 (0.96), CL 0.24 (0.22), CW 0.53 (0.54), ML 0.55 (0.55), EL 0.40 (0.40), EW 0.30 (0.31), FCDp 0.42 (0.43), FCDa 0.31 (0.31), SL 1.30 (1.27), SWmax 0.16 (0.16), SWmin 0.08 (0.08), WL 1.94 (1.94), PW 0.96 (0.97), HFL 1.30 (N.A.), HFT 0.29 (N.A.), HTL 1.24 (N.A.), PetW 0.45 (0.44), PetL 0.24 (0.22), FCDI 137 (141), CI 94 (101), SI 101 (98), MI 40 (42). Head . General morphology as for the genus (see above). Frontal carinae less approaching one another anteriorly ( FCDI = 137) and with convex curvature laterally ( Fig. 4 d ). Mesosoma and metasoma . As for the genus (see above). Pilosity . Tiny appressed hairs (approximately twice the length of ommatidium) present only sparsely over the head and mesosoma; numerous relatively long erect hairs (length ≥ SW ) present on the clypeus and head, and all over abdomen; these longer hairs also present on genae and occipital corners of the head and on frons, surpassing the head margin in frontal view ( Fig. 4 b ); scape with relatively long hairs of both appressed and erect type , the erect hairs not limited to the apical tip but present along most of the scape ( Fig. 4 b ). Approximately eight erect hairs growing dorsally from apical margin of petiole. Sculpture . Fine shallow lines, joining each other to a cell formation over the glossy cuticle of the head ( Fig. 4 b , d ). These lines also present dorsolaterally on mesosoma; the lineation very soft and rather curved, except the lateral sites of mesosoma below metathoracic spiracle and towards coxae and on propodeum, where lines are somewhat deeper and straight ( Fig. 4 a ); soft lineation also present on frontal coxae and petiole. Colouration . Head, thorax and scape of rather glossy metallic appearance and black, except at scape apex where lighter brown; petiole, abdomen, apical parts of femurs and tibiae brown; tarsi, apex of funiculus and palps brown; femurs pale yellow near the joints; trochanters and mid and hind coxae pale yellow ( Fig. 4 a , c ). Description of male and queen None (no material) Remarks Body size is somewhat larger on average than in the other two Overbeckia species but due to the availability of only two specimens , assessing whether body size is significantly larger is difficult (the size is comparable to the largest workers measured from series of O. papuana ).