Tetramorium ryanphelanae

The distribution of the new species seems to be restricted to the northernmost tip of Madagascar, where it is generally found in tropical dry forests at elevations of 60 m to 425 m. The southernmost localities are Foret d'Andavakoera and Foret de Binara, while the northernmost are Montagne des Français and Foret d'Orangea. (Hita Garcia and Fisher 2012)

Identification
A member of the Tetramorium bessonii-species group

Key to Tetramorium bessonii-group species

The following character combination renders T. ryanphelanae recognisable within the T. bessonii group: short antennal scapes SI 76 - 78; PSLI 28 - 33; absence of promesonotal suture; high nodiform petiolar node in profile with approximately parallel anterior and posterior faces, anterodorsal and posterodorsal angles at about same height, dorsum not tapering backwards posteriorly; presence of standing hairs on waist segments and first gastral tergite; and relatively long, appressed to decumbent pubescence on first gastral tergite. (Hita Garcia and Fisher 2012)

Distribution based on Regional Taxon Lists
Malagasy Region: Madagascar.

Nomenclature

 *  ryanphelanae. Tetramorium ryanphelanae Hita Garcia & Fisher, 2012: 25, figs. 10, 23-25 (w.) MADAGASCAR.

Worker
HL 0.68 - 0.88 (0.81); HW 0.70 - 0.90 (0.83); SL 0.54 - 0.68 (0.63); EL 0.15 - 0.21 (0.18); PH 0.41 - 0.56 (0.49); PW 0.53 - 0.68 (0.62); WL 0.91 - 1.22 (1.09); PSL 0.21 - 0.28 (0.25); PTL 0.17 - 0.23 (0.20); PTH 0.31 - 0.37 (0.34); PTW 0.25 - 0.32 (0.28); PPL 0.22 - 0.27 (0.25); PPH 0.29 - 0.37 (0.33); PPW 0.31 - 0.42 (0.36); CI 101 - 104 (102); SI 76 - 78 (77); OI 20 - 23 (22); DMI 56 - 59 (57); LMI 43 - 47 (45); PSLI 28 - 33 (30); PeNI 41 - 50 (46); LPeI 52 - 62 (59); DPeI 133 - 150 (142); PpNI 52 - 62 (58); LPpI 70 - 80 (74); DPpI 135 - 155 (146); PPI 122 - 132 (126) (15 measured).

Head wider than long (CI 101 - 104). Anterior clypeal margin with distinct median impression. Frontal carinae well-developed, becoming weaker and fading out shortly after level of posterior eye margin. Antennal scrobes faint to absent, posterior and ventral margins never differentiated. Antennal scapes short, not reaching posterior head margin (SI 76 - 78). Eyes small to moderate (OI 20 - 23). Mesosomal outline in profile convex, dorsally transversely rounded, weakly to moderately marginate from lateral to dorsal mesosoma, promesonotal suture and metanotal groove absent; mesosoma comparatively stout (LMI 43 - 47). Propodeal spines elongate-triangular to spinose, long, and acute (PSLI 28 - 33). Propodeal lobes very small and broadly triangular. Petiolar node in profile high nodiform, anterior and posterior faces approximately parallel, anterodorsal and posterodorsal angles at about same height, dorsum not tapering backwards posteriorly; node in dorsal view not strongly transverse, between 1.3 to 1.5 times wider than long (DPeI 133 - 150), in lateral view between 1.6 to 1.9 times higher than long (LPeI 52 - 62). Postpetiole in profile rounded and weakly anteroposteriorly compressed, approximately 1.2 to 1.4 times higher than long (LPpI 70 - 80), in dorsal view between 1.3 to 1.6 wider than long (DPpI 135 - 155). Postpetiole in profile a bit less voluminous than petiolar node, in dorsal view approximately 1.2 to 1.3 times wider than petiolar node (PPI 122 - 132). Mandibles distinctly longitudinally striate; clypeus always with strong median longitudinal ruga and generally one weaker ruga at each side; remainder of head mostly unsculptured, cephalic dorsum between frontal carinae only with one well-developed longitudinal median ruga, remainder unsculptured, median ruga of same length as frontal carinae and diverging approximately at eye level into two rugae running to posterior clypeal margin; scrobal area, lateral and ventral head mostly unsculptured. Ground sculpture faint. Mesosoma, waist segments, and gaster unsculptured and smooth. Ground sculpture on whole body faint to absent. All dorsal surfaces of body generally with long, erect pilosity in combination with comparatively long appressed pubescence. Body colouration uniformly brown.

Type Material
Holotype worker, MADAGASCAR, Antsiranana, Réserve Spéciale de l'Ankarana, 22.9 km 224° SW Anivorano Nord, 12.90889 S, 49.10983 E, 80 m, sifted litter, tropical dry forest, BLF2972, 10.-16.II.2001 (B.L. Fisher et al.) (: CASENT0454495). Paratypes nine workers with same data as holotype (CASC: CASENT0454488; CASENT0454492; CASENT0454498; CASENT0454506; CASENT0454508; CASENT0454510; CASENT0454512; CASENT0454514; CASENT0454515); seven workers with same data as holotype but from ground nest and collection code BLF2992 (CASC: CASENT0427964; CASENT0427965; CASENT0427966); and 31 workers from Antsiranana, Réserve Spéciale de l'Ankarana, 13.6 km 192° SSW Anivorano Nord, 12.86361 S, 49.22583 E, 210 m, sifted litter, tropical dry forest, collection codes BLF3010 and BLF3012, 16.-21.II.2001 (B.L. Fisher et al.) (: CASENT0441698; CASC: CASENT0401616; CASENT0401617; CASENT0401618; CASENT0401619; CASENT0401620; CASENT0401621; CASENT0441560; CASENT0441565; CASENT0441566; CASENT0441567; CASENT0441576; CASENT0441577; CASENT0441578; CASENT0441579; CASENT0441582; CASENT0441586; CASENT0441588; CASENT0441619; CASENT0441621; CASENT0441624; CASENT0441624; CASENT0441655; CASENT0448303; CASENT0448311; CASENT0448345; CASENT0448347; CASENT0448367; CASENT0448373; : CASENT0441569; : CASENT0448330; : CASENT0441581).

Etymology
The new species is named in honor of Ryan Phelan for her support to discover and identify life on earth.