Pseudomyrmex janzeni
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BibTeX: @article{Ward1993JournalofHymenopteraResearch2, RIS/ Endnote: TY - JOUR Wikipedia/ Citizendium: <ref name="Ward1993Journal of Hymenoptera Research2">{{Citation |
Ordo: Hymenoptera
Familia: Formicidae
Genus: Pseudomyrmex
Name
Pseudomyrmex janzeni Ward, Philip S., 1993 – Wikispecies link – Pensoft Profile
- Pseudomyrmex janzeni Ward, Philip S., 1993, Journal of Hymenoptera Research 2: 143-144.
Description
(Figs. 19, 29, 64, 70)
Materials Examined
Mexico 60 mi. SE Acaponeta, Hwy. 15 D. H. Janzen Mexico 60 mi. SE Acaponeta, Hwy. 15 D. H. Janzen Mexico 60 mi. SE Acaponeta, Hwy. 15 D. H. Janzen Mexico 60 mi. SE Acaponeta, Hwy. 15 D. H. Janzen Mexico 60 mi. SE Acaponeta, Hwy. 15 D. H. Janzen Mexico 60 mi. SE Acaponeta, Hwy. 15 D. H. Janzen Mexico 60 mi. SE Acaponeta, Hwy. 15 D. H. Janzen Mexico 60 mi. SE Acaponeta, Hwy. 15 D. H. Janzen Mexico 60 mi. SE Acaponeta, Hwy. 15 D. H. Janzen Mexico 60 mi. SE Acaponeta, Hwy. 15 D. H. Janzen Mexico 60 mi. SE Acaponeta, Hwy. 15 D. H. Janzen Mexico 60 mi. SE Acaponeta, Hwy. 15 D. H. Janzen Mexico 60 mi. SE Acaponeta, Hwy. 15 D. H. Janzen Mexico 60 mi. SE Acaponeta, Hwy. 15 D. H. Janzen
Description
Worker measurements (n = 12). - HL 1.00-1.18, HW 0.93-1.03, MFC 0.063-0.096, Cl 0.88-0.94, REL 0.45-0.47, REL2 0.49-0.52, OOI 1.45-2.29, VI 0.58-0.68, FCI 0.068-0.098, SI 0.42-0.45, SI2 0.84-0.91, NI 0.62-0.69, PLI 0.59-0.71, PWI 0.63- 0.73, PPWI 1.37-1.73.
Diagnosis
Worker diagnosis. - Very similar to P. ferrugineus (q.v.) except as follows. Size smaller, on average. In lateral view mesonotum less steeply inclined; basal and declivitous faces of propodeum forming a less obtuse angle (compare Figs. 27 and 29). Petiole shorter and higher, on average (Fig. 48). Weak rugulo-punctate sculpture on propodeum even less evident than in P. ferrugineus. Pubescence denser, becoming decumbent to suberect on parts of body, most notably the gula (Fig. 19). Head and mesosoma rather light orange-brown, gaster the same or a slightly darker brown.
Discussion
Comments. - Within the P. ferrugineus group P. janzeni can be characterized by its relatively small size (worker and queen HW <1.04), broad head (worker Cl> 0.86), laterally rounded median clypeal lobe, and uniform orange-brown color. P. janzeni is evidently closely related to P. ferrugineus (as surmised by Janzen 1973); all of the metric measurements and indices of these two species overlap, although there is a tendency for P. janzeni workers to have shorter, higher petioles (Fig. 48). Workers and queens of P. janzeni are perhaps best distinguished from those of P. ferrugineus by the combination of lighter orange-brown color, suberect gular pubescence (best seen in a backlit lateral view of the head), and the flatter profile of the worker mesosoma (see description above and Fig. 29). While some individuals of the highly variable P. ferrugineus approach these conditions there is no indication of a convergence towards this morphology in western Mexico (Guerrero) where populations of P. ferrugineus come closest to those of P. janzeni.
Distribution
Distribution and biology. - First recognized by Janzen (1967a, 1969, 1973) as a distinct but undescribed species, P. janzeni is confined to a limited area in western Mexico (Fig. 70) where it is sympatric with the much darker colored and commoner P. veneficus. Colonies occupy Acacia hindsii and are polygynous; additional details of the life history can be found in Janzen's (1973) paper on polygynous acacia-ants.
Materials Examined
Mexico Puerto Vallarta J. A. Comstock Mexico 14.5 mi E San Blas D. H. Janzen Mexico 2 mi E San Blas R. van den Bosch Mexico 31 mi N Tepic D. H. Janzen Mexico 36 mi N Tepic D. H. Janzen Mexico 4 mi E San Blas M. Irwin Mexico 4 mi E San Blas M. Irwin, E. I. Schlinger Mexico 4 mi E San Blas E. I. Schlinger Mexico 5 mi E San Blas F. Parker, D. Miller Mexico Compostela c. u. Mexico Rio Palillo, 14 mi E San Bias D. H. Janzen Mexico Tepic H. A. Scullen Mexico 20 mi E Villa Union E. I. Schlinger
Taxon Treatment
- Ward, Philip S.; 1993: Systematic studies on Pseudomyrmex acacia-ants (Hymenoptera: Formicidae: Pseudomyrmecinae), Journal of Hymenoptera Research 2: 143-144. doi
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