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 : 1

publication ID

21169

DOI

https://doi.org/10.5281/zenodo.6242886

persistent identifier

https://treatment.plazi.org/id/AF37B0C8-A5EC-F721-4190-7A3D50DD06B1

treatment provided by

Thomas

scientific name

Tetramorium exile Csoesz & Radchenko
status

sp. nov.

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 1961 a, 1961 b, Pisarski 1967a, 1967 b, 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.

HNHM

Hungary, Budapest, Hungarian Natural History Museum

MIZ

MIZ

NHMW

Austria, Wien, Naturhistorisches Museum Wien

PCAS

PCAS

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Hymenoptera

Family

Formicidae

Genus

Tetramorium

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