Taxonomic Revision Of The Striativentre Species Group Of The Genus Tetramorium (Hymenoptera, Formicidae) Author Radchenko, A. G. Author Scupola, A. text Vestnik Zoologii 2015 2015-06-01 49 3 219 244 http://dx.doi.org/10.1515/vzoo-2015-0024 journal article 10.1515/vzoo-2015-0024 695a9673-b9e0-4416-8224-572becc377b8 2073-2333 6452367 Tetramorium saudicum Sharaf, 2013 Tetramorium saudicum Sharaf, 2013: 574 , workers, Saudi Arabia (in Sharaf et al., 2013 ). M a t e r i a l e x a m i n e d. Paratypes , 3 workers , “ Saudi Arabia , Rawdhat Khorim , 25-22-986 N, 47-16-712 E, 559 m , 24.II.2012 , HP (A) No. 0067” (nest of holotype ) ( SIZK ) . Measurements of workers (in mm; n = 3), ordered as: min-max: HL 0.80–0.81, HW 0.78–0.78, FW 0.32–0.33, FLW 0.36–0.37, OL 0.20–0.21, GnL 0.19–0.21, SL 0.61–0.62, ML 0.96–0.99, PNW 0.52–0.52, PL 0.33–0.33, PW 0.24–0.25, PH 0.26–0.28, PndL 0.20–0.21, PPL 0.21–0.22, PPW 0.28–0.30, PPH 0.21–0.23, ESL 0.10-0.13, ESD 0.21–0.22, HTL 0.55– 0.56. Indices: CI 1.03–1.04, SI 1 0.74–0.77, SI 2 0.77–0.79, FI 0.41–0.42, FLI 1.12–1.13, OI 1 0.25–0.27, OI 2 1.00–1.06, PI 1 1.20–1.24, PI 2 0.31–0.32, PndI 1.16–1.22, PPI 1 0.76–0.80, PPI 2 0.35–0.38, ESLI 0.13–0.17. For some more measurements see Sharaf et al. (2013) . T a x o n o m i c n o t e s. T. saudicum the most resembles T. sabatinellii and differs from it by some morphometrics features (see Note to the latter species and Key). A key to species of Tetramorium striativentre species group (workers and queens 1 ) 1. Whole surface of first gastral tergite densely longitudinally striato-punctated ( fig. 1 , d; 2 , c; 6 , d; 7 , b; 10 , d; 11 , e)..................................................................................................................................................................2 – Only basal half of first gastral tergite densely longitudinally striato-punctated, remainder part of tergite smooth and shiny or at most with fine superficial microreticulation ( fig. 5 , d; 14 , d; 15 , e)....................5 2(1). Frontal carinae not curved, gradually converging anteriorly, so that frontal lobes not extended laterally (FLI in workers 1.00–1.06, mean 1.01, in queens <1.00, mean 0.96); longitudinal rugosity on head dorsum relatively fine, number of rugae between frontal carinae level with the eyes> 15 (mean in workers 18, in queens — 21) ( fig. 6 , c; 7 , c). Petiolar node transversal (mean PndI in workers 1.34, in queens — 1.78); both petiolar node dorsum and postpetiolar dorsum with regular longitudinally-concentric rugae ( fig. 6 , b; 7 , b). Propodeum with short denticles (mean ESLI in workers 0.10, in queens — 0.08) ( fig. 6 , a; 7 , a). .................................................................................................................................. T. striativentre Mayr – Frontal carinae curved above antennal insertions, frontal lobes distinctly extended (FLI ≥ 1.08, means in workers 1.12 … 1.17, in queens 1.09 … 1.15); longitudinal rugosity on head dorsum various ( fig. 1 , c; 2 , d; 10 , c; 11 , d). Petiolar node of various shape, petiolar node dorsum with sinuous longitudinal rugae, postpetiolar dorsum with longitudinal rugae ( fig. 1 , b; 2 , e; 10 , b; 11 , c). Propodeum with longer teeth or even thin spines (means ESLI in workers 0.15 … 0.19, in queens 0.11 … 0.17) ( fig. 1 , a; 2 , a; 10 , a; 11 , a)'............................................................................................................................................................................3 3(2). Petiolar node subcircle (mean PndI in workers 1.02, in queens — 1.40) ( fig. 10 , b; 11 , c). Longitudinal rugosity on head dorsum relatively fine, number of rugae between frontal carinae level with the eyes> 15 (mean 23) ( fig. 10 , c; 11 , d)............................................................................................ T. schneideri Emery – Petiolar node transversal (means PndI in workers 1.20 … 1.35, in queen 1.40) ( fig. 1 , b; 2 , e). Longitudinal rugosity on head dorsum coarser, number of rugae between frontal carinae level with the eyes <15 (means 12 … 13) ( fig. 1 , c; 2 , d). ....................................................................................................................... 4 4(3). Scape somewhat shorter, mean SI1 0.75, SI2 0.78. Petiolar node somewhat narrower, mean PndI 1.20; postpetiole somewhat narrower, mean PPI1 0.77, mean PPI2 0.36. Gena only somewhat longer than maximal diameter of eye, mean OI2 1.04. ........................................................................ T. saudicum Sharaf – Scape somewhat longer, mean SI1 0.80, SI2 0.84. Petiolar node somewhat wider, mean PndI 1.35; postpetiole somewhat wider, mean PPI1 0.70, mean PPI2 0.39. Gena distinctly longer than maximal diameter of eye, mean OI2 1.10 ......................................................................................................... T. sabatinellii sp. n. 1 Queens of T. pisarskii and T. saudicum are unknown. 5(1). Mesosomal dorsum and waist dorsum with sinuous longitudinal rugae ( fig. 14 , b; 15 , c). Longitudinal rugosity on head dorsum coarser, number of rugae between frontal carinae level with the eyes ≤ 15 ( fig. 14 , c; 15 , d). ....................................................................................................... T. kabulistanicum Pisarski – Mesosomal dorsum with more regular, almost straight longitudinal rugae, waist dorsum with regular longitudinally-concentric rugae ( fig. 5 , b). Longitudinal rugosity on head dorsum less coarse, number of rugae between frontal carinae level with the eyes ≥ 20 ( fig. 5 , c) ................................ T. pisarskii sp. n. A key to species of Tetramorium striativentre species group (males 2 ) 1. Surface of first gastral tergite finely, but densely longitudinally striato-punctated ( fig. 12 , e). Petiole very long and low, PI1 2.00 ( fig. 12 , c). .................................................................................... T. schneideri Emery – Surface of first gastral tergite smooth and shiny ( fig. 3 , e; 8 , b; 16 , d). Petiole shorter and higher, PI1 <1.70 ( fig. 3 , a; 8 , a; 16 , a).......................................................................................................................................2 2(1). Genae very short, OI2 6.50; petiole longer and lower, PI1 1.68 ( fig. 3 , a, d). ............. T. sabatinellii sp. n. – Genae longer, OI2 <5.50; petiole shorter and higher, PI1 <1.50 ( fig. 8 , b, c; 16 , a, c)..............................3 3(2). Petiole narrower and higher, PI1 <1.30, PI2 ≤ 0.45; genae longer, OI2 <4.20 ( fig. 3 , a–c). ………………… ................................................................................................................ T. striativentre Mayr – Petiole wider and lower, PI1> 1.45, PI2> 0.50; genae shorter, OI2> 5.00 ( fig. 16 , a, c, e) ......................... ..................................................................................................................................... T. kabulistanicum Pisarski We are sincerely grateful to curators of the museum collection for the providing material for investigation: Elena Fedosseva (ZMMU), Fabrizio Rigato (MSNM), Mostafa Rezek Sharaf (Er-Riyadh), Mauro Daccordi (Verona) and Marco Uliana (MSNVE), and to Vladimir Radchenko (Kyiv), who made photos of the male genitalia of T. striativentre . Finally, particular thanks to Guido Sabatinelli ( Amman ) for his courtesy and assistance in the field researches in Jordan .