Tetramorium chefketi

Csösz S., Radchenko, A. & Schulz, A., 2007, Taxonomic revision of the Palaearctic Tetramorium chefketi species complex (Hymenoptera: Formicidae)., Zootaxa 1405, pp. 1-38: 5-10

publication ID

21169

persistent identifier

http://treatment.plazi.org/id/96CF8FDA-AAA2-CF57-1A08-6CA488173A3F

treatment provided by

Thomas

scientific name

Tetramorium chefketi
status

 

Definition of the T. chefketi  HNS  species complex

Species belonging to the T. chefketi  HNS  species complex can be defined by the following combination of characters:

Workers

a) polygonal striae are continuous on 1st gastral tergite, and is sometimes microreticulate basally. Polygonal striation: interstices marked by feeble anastomosing striae (Fig. 8.), compare to microreticulation: interstices marked by very feeble elevated structures, like rugulae (Fig. 6, 7.);

b) head, alitrunk and waist coarsely sculptured, dorsum of petiolar node and postpetiole coarsely rugose and/ or reticulate.

c) petiole and postpetiole relatively narrow (CS/PEW and CS/PPW, Table 1);

d) ground surface on the frons is usually coarsely microreticulate;

Gynes

e) alitrunk is low, dorsum is flattened in profile;

f) scutum in dorsal view is somewhat narrowed anteriorly and does not cover completely the pronotum, humeri are well visible;

g) head, alitrunk and waist are coarsely sculptured, and petiole and postpetiole dorsum coarsely rugose or/ and reticulate;

h) polygonal striae disrupted on 1st first gastral tergite, sometimes microreticulate basally;

i) mandibles are longitudinally striate; j) petiole and postpetiole are relatively narrow (WAIST, Table 2);

Males

k) head and alitrunk with usually coarsely sculpture, ground surface microreticulate;

l) sides of petiole and postpetiole not angulate as in the ferox  HNS  species complex (in dorsal view);

m) first gastral tergite usually smooth and shiny, or feebly striate;

n) stipes of genitalia blunt, curved inwards at the top, with flattened apical plate (in caudal view);

We placed the following species into the chefketi  HNS  species complex:

1) Tetramorium alternans Santschi  HNS  , 1929

Tetramorium biskrensis kahenae Menozzi  HNS  , 1934 new synonymy

2) Tetramorium anatolicum Csoesz & Schulz  HNS  , new species

3) Tetramorium annectens Pisarski  HNS  , 1969 status revised

4) Tetramorium chefketi Forel  HNS  , 1911

Tetramorium caespitum var. sarkissiani Forel  HNS  , 1911 new synonymy

Tetramorium turcomanicum Santschi  HNS  , 1921 new synonymy

Tetramorium taurocaucasicum Arnoldi  HNS  , 1968 new synonymy

Tetramorium forte Forel  HNS  , 1904 [in part, only material from Crimea and Caucasus] (for details of clarification of synonymy see Taxonomic notes under Tetramorium chefketi  HNS  )

5) Tetramorium exile Csoesz & Radchenko  HNS  , new species

6) Tetramorium moravicum Kratochvil  HNS  , 1941

Tetramorium rhenanum Schulz  HNS  , 1996

7) Tetramorium rhodium Emery  HNS  , 1922 status revised

8) Tetramorium sanetrai Schulz & Csoesz  HNS  , new species

9) Tetramorium sulcinode Santschi  HNS  , 1927 status revised

Tetramorium karakalense Dlussky & Zabelin  HNS  , 1985 new synonymy

10) Tetramorium syriacum Emery  HNS  , 1922

The newly defined chefketi  HNS  species complex may not strictly reflect the phylogenetic relationship of the above-mentioned species. T. sulcinode  HNS  and T. annectens  HNS  possess several autapomorphic characters (e.g. relatively large eyes and a long psammophore) what probably may lead to place them into a separate group in a future.

Key to the species of the Tetramorium chefketi  HNS  species complex

Workers

1. Ventral surface of head with a row of short and several very long setae, forming a psammophore (figs 3, 4) [sometimes setae can be broken or lost]. Eyes larger, EYE = 0.185 ...................................................2

- Ventral surface of head with several short and a few longer straight setae, psammophore not developed (fig. 5). Eyes smaller, EYE <0.185..........................................................................................................3

2(1). Dorsum of petiolar node and postpetiole with sinuous rugae and coarse irregular reticulation. Ground surface microreticulate. Petiole much narrower than postpetiole, PEW/PPW 0.73 [0.70, 0.75] (China and Mongolia) ............................................................................................. T. annectens Pisarski  HNS  , 1969

- Dorsum of petiolar node usually with semi-circular rugulae, ground surface smooth and shiny, postpetiole longitudinally rugulose, and shiny. Petiole slightly narrower than postpetiole, PEW/PPW 0.84 [0,80; 0,88] (Afghanistan, Pakistan and Turkmenistan) ............................. T. sulcinode Santschi  HNS  , 1927

3(1). Frons extremely wide FR/CS 0.50 [0.49, 0.54] (Middle East) ....................... T. syriacum Emery  HNS  , 1922

- Frons narrower FR/CS <0.41..................................................................................................................4

4(3). Scape shorter, SL/CS = 0.75.....................................................................................................................5

- Scape longer, SL/CS = 0.76......................................................................................................................7

5(4). Dorsal surface of petiole steeply rounded backward, NOH/NOL 1.03 [0.94, 1.13] petiole relatively high, PEH/NOL 1.84 [1.68, 2.04]. Dorsum of petiolar node and postpetiole with very feeble concentric sinuous rugulae and reticulation, medially microreticulate. D(2b) 0.093 FR - 0.148 NOL - 2.941 = +2.647 [+1.069, +4.647] (NW Africa) ..................................................................... T. alternans Santschi  HNS  , 1929

- Petiolar node cubic in profile, NOH/NOL 0.84 [0.76, 0.97], petiole relatively low and long, PEH/NOL 1.50 [1.38, 1.73]. Dorsum of petiolar node and postpetiole coarsely rugoso-reticulate. D(2b) 0.093 FR - 0.148 NOL - 2.941 <+0.369 [-4.206, +0.369] ....................................................................................... 6

6(5) Head dorsum and alitrunk coarsely rugoso-reticulate, ground surface coarsely microreticulate. Scape feebly costulate, first gastral tergite microreticulate. D(3b) 0.118 MW - 0.121 PEH - 0.084 PPH - 4.585 = +2.643 [-0.619, +4.595] (Asia Minor, Rhodes and Cyprus)......................... T. rhodium Emery  HNS  , 1922

- Head dorsum and alitrunk feebly rugoso-reticulate, ground surface feebly microreticulate. Scape always smooth, first gastral tergite never microreticulate but well polygonally striate. D(3b) 0.118 MW - 0.121 PEH - 0.084 PPH - 4.585 = -2.643 [-4.022, -0.882] (Italy) ..... T. sanetrai Schulz & Csoesz  HNS  n. sp.

7(4). Base of scape with well visible dorsal carina, elongate ridge and costulae extending whole scape length (fig. 49) (Central and East Europe, SE France and NW Italy, Caucasus, and Asia Minor)....................... ............................................................................................................... T. moravicum Kratochvil  HNS  , 1941

- Base of scape without dorsal carina, surface not costulate, smooth and shiny at least basally (figs 24, 38 and 42; see also figs 17, 31, 60 and 67) ..................................................................................................8

8(7). Petiolar node cubic in profile, NOH/NOL 0.86 [0.76, 0.97], petiole relatively low and long, PEH/NOL 1.53 [1.37, 1.69] (fig. 37) (Eastern part of South Europe to Kyrgyzstan) ........... T. chefketi Forel  HNS  , 1911

- Petiolar node trapezoidal in profile, NOH/NOL = 0.96, petiole relatively high, PEH/NOL> 1.74 (figs 23 and 40).................................................................................................................................................9

9(8) Dorsum of alitrunk rugoso-reticulate, ground surface microreticulate (fig. 39). Scape long, SL/CS 0.82 [0.82, 0.85], frons narrow, FR/CS 0.34 [0.33, 0.35], frontal lobes as wide as frons, FL/FR 1.0 [1.0, 1.02]. D(2a) 0.081 SL - 0.151 FL - 7.652 = +2.683 [+1.193, +3.493]. (Afghanistan) ............................... .......................................................................................................... T. exile Csoesz & Radchenko  HNS  n. sp.

- Dorsum of alitrunk with parallel rugulae, ground surface feebly microreticulate (fig. 22). Scape shorter, SL/CS 0.78 [0.76, 0.81], frons wider, FR/CS 0.37 [0.35, 0.39], frontal lobes wider, FL/FR 1.02 [1.0, 1.08]. D(2a) 0.081 SL - 0.151 FL - 7.652 = -2.683 [-4.682, -0.042]. (Anatolia, Turkey) .......................... ....................................................................................................... T. anatolicum Csoesz & Schulz  HNS  n. sp.

Gynes (gynes of T. exile  HNS  , T. rhodium  HNS  , and T. syriacum  HNS  are unknown)

1. Ventral surface of head with a row of short and several very long setae, forming a psammophore (in gynes this character is less distinct than in workers) ..............................................................................2

- Ventral surface of head with several short and a few straight, moderately long setae, psammophore absent ......................................................................................................................................................3

2(1). Dorsum of petiolar node and postpetiole with sinuous rugae and coarse irregular reticulation. Petiolar node relatively low, NOH/NOL 1.38, PEH/NOL 2.56 ............................... T. annectens Pisarski  HNS  , 1969

- Dorsum of petiolar node usually with semi-circular rugulae, smooth medially, postpetiole longitudinally striate. Petiolar node relatively high, NOH/NOL 1.71 [1.52, 1.91], PEH/NOL 3.30 [3.12, 3.63] ... ...................................................................................................................... T. sulcinode Santschi  HNS  , 1927

3(1). Dorsal crest of petiolar node slightly convex with a well visible protuberance medially in frontal view (fig 43.). Scape basally with a well visible dorsal carina, elongated costulae sometimes extending whole scape surface (fig 45.). Head slightly narrower than scutum, MW/CS 1.07 [1.05, 1.13] .......................... ............................................................................................................... T. moravicum KratochvIl  HNS  , 1941

- Dorsal transversal crest of petiolar node straight, without protuberance medially (in frontal view). Scape basally without dorsal carina and without elongated costulae. Head wider than scutum, MW/CS <1.0 ........................................................................................................................................................4

4(3). Ventral part of katepisternum smooth and shiny. Petiolar node dorsum steeply rounded backward in profile ......................................................................................................................................................5

- Ventral part of katepisternum rugoso-reticulate and microreticulate. Petiolar node dorsum flattened in profile ......................................................................................................................................................6

5(4). Dorsum of petiolar node and postpetiole finely microreticulate, smooth medially. Scape shorter, SL/CS 0.69 [0.65, 0.71] ........................................................................................... T. alternans Santschi  HNS  , 1929

- Dorsum of petiolar node and postpetiole reticulate and microreticulate. Scape longer SL/CS 0.75 [0.71, 0.77] ............................................................................................. T. anatolicum Csoesz & Schulz  HNS  n. sp.

6(4). Whole dorsum of petiolar node and postpetiole coarsely rugose. Scape longer, SL/CS 0.77 [0.75, 0.79]. ............................................................................................................................... T. chefketi Forel  HNS  , 1911

- Dorsum of petiolar node and postpetiole coarsely rugose, but medially smooth. Scape shorter, SL/CS 0.67 [0.66, 0.68] ................................................................................. T. sanetrai Schulz & Csoesz  HNS  n. sp.