Tetramorium exile Csoesz & Radchenko,

Csösz S., Radchenko, A. & Schulz, A., 2007, Taxonomic revision of the Palaearctic Tetramorium chefketi species complex (Hymenoptera: Formicidae)., Zootaxa 1405, pp. 1-38: 22-24

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Tetramorium exile Csoesz & Radchenko

New species

5. Tetramorium exile Csoesz & Radchenko  HNS  New species (figs 39-42)

Description of Worker (figs 39-42). Morphometric data of the holotype worker: CL: 725; CW: 675; FR: 240; FL: 240; SL: 585; ML: 790; MW: 440; PEW: 215; PEH: 240; NOH: 130; NOL: 130; PEL: 155; PPW: 240; PPL: 160; PPH: 210; SPL: 90; SPSP: 130; EL: 135; EH: 100; ED: 170; Small size, CS 695 [620, 743]. Whole body and appendages brown to dark brown. Head elongated, CL/CW 1.06 [1.04, 1.08], with very feebly convex sides, straight occipital margin and narrowly rounded occipital corners. Eyes small, EYE 0.167 [0.158, 0.175]. Frons very narrow, FR/CS 0.34 [0.33, 0.35], frontal lobes as wide as frons, FL/FR 1.0 [1.0, 1.02]. Scape very long, SL/CS 0.84 [0.82, 0.85], without longitudinal dorsal carina basally, smooth and shiny. Promesonotal dorsum slightly convex, metanotal groove very shallow or completely absent. Propodeal teeth moderately long and acute, directed mainly upwards. Petiolar node trapezoidal in profile, NOH/NOL 1.04 [0.90, 1.16], petiole relatively high, PEH/NOL 1.83 [1.70, 1.96]. General appearance moderately rugose, ground surface microreticulate, dull. Head dorsum longitudinally rugose, ground surface microreticulate, occiput rugoso-reticulate. Alitrunk dorsum and petiolar node rugoso-reticulate ground surface microreticulate, mesopleuron usually rugulose and microreticulate, dorsum of postpetiole longitudinally rugulose and microreticulate. Polygonal striation continuous on 1st gastral tergite (see fig. 8.). Ventral surface of head with several short and few moderately long, straight setae arising posterior to buccal cavity (see fig. 5.).

Gynes and Males are unknown.

Material examined: HOLOTYPE [[worker]]: AFGHANISTAN - O-Afghanistan, Walang, 2520m, Salangtal, Hindukusch , 29.09.1952. leg. J. Klapperich ( HNHM)  ; PARATYPES: 35 [[workers]] from the same nest (3[[workers]] / HNHM, 4[[workers]] / MIZ, 25[[workers]] / NHMW 1[[worker]] / PCAS)  .

Morphometrics: (33 workers were measured).

Diagnosis. According to the literature (Collingwood 1961a, 1961b, Pisarski 1967a, 1967b, 1969) and collection materials there are no similar Tetramorium  HNS  species, described from Afghanistan. Workers of T. exile  HNS  n. sp. differ from related species by absence of psammophore, relatively small eyes, (EYE, Table 1.), extremely narrow firons, the very long and smooth scape (FR/CS and SL/CS, Table 1.), and by the trapezoidal petiolar node (NOH/NOL and PEH/NOL, Table 1.). Tetramorium exile  HNS  n. sp. is mostly similar to T. anatolicum  HNS  sp.n. and T. chefketi  HNS  , but differs from the latter by the shape of petiolar node: in T. exile  HNS  n. sp. it is relatively high and short, trapezoidal in profile, while in T. chefketi  HNS  it is relatively low and longer, cubic in profile, (PEH/NOL and NOH/NOL, Table 1.). The following Discriminant D(3a) function proves the separation between T. exile  HNS  n. sp. and T. chefketi  HNS  : D(3a) = 0.052 PPW -0.057 FL -0.081 NOL +14.667, T. exile  HNS  n. sp. D(3a) = +3.418 ±0.901 [+2.169, +4.756] (n=33), T. exile  HNS  n. sp., holotype D(3a) = +3.023, p<0.001, T. anatolicum  HNS  n. sp. D(3a) = +3.164 ±0.796 [+1.746, +4.606] (n=38), T. anatolicum  HNS  n. sp., holotype D(3a) = +3.246, p<0.001, T. chefketi  HNS  D(3a) = -3.417 ±1.004 [-5.680, -0.524] (n=107), T. chefketi  HNS  lectotype D(3a) = -4.179, p<0.001; T. sarkissiani  HNS  lectotype D(3a) = -2.809, p<0.001; T. turcomanicum  HNS  syntype worker D(3a) = -4.169, p<0.001.

T. exile  HNS  n. sp. differs from T. anatolicum  HNS  n. sp. by its longer scape and narrower firons (SL/CS and FR/CS, Table 1.). The following Discriminant D(2a) function provides the separation between T. exile  HNS  n. sp. and T. anatolicum  HNS  n. sp.: D(2a) = 0.081 SL - 0.151 FL - 7.652

T. exile  HNS  n. sp. D(2a) = +2.683 ±0.762 [+1.193, +3.493] (n=33), T. exile  HNS  n. sp., holotype D(2a) = +3.493, p<0.001, T. anatolicum  HNS  n. sp. D(2a) = -2.683 ±1.064 [-4.682, -0.042] (n=38), T. anatolicum  HNS  n. sp., holotype D(2a) = -3.117, p<0.001.

For further combination of morphometric characters see Table 1-2.

Distribution. Known from the type locality only.

Etymology. This adjective [exilis / -e; exile (neutrum) = slender] refers to the elongate body of this species.


Hungary, Budapest, Hungarian Natural History Museum




Austria, Wien, Naturhistorisches Museum Wien