Strumigenys jacobsoni Menozzi, 1939

Tang, Kit Lam & Guénard, Benoit, 2023, Further additions to the knowledge of Strumigenys (Formicidae: Myrmicinae) within South East Asia, with the descriptions of 20 new species, European Journal of Taxonomy 907, pp. 1-144 : 73-74

Strumigenys jacobsoni Menozzi, 1939

Figs 2D , 23D–F ; Table 2

Strumigenys (Cephaloxys) jacobsoni Menozzi, 1939: 180 , fig. 4 (w.) INDONESIA (Sumatra). Indomalaya.

Smithistruma jacobsoni – Brown 1948: 105.

Weberistruma jacobsoni – Brown 1949b: 8.

Pyramica jacobsoni – Bolton 1999: 1673.

Strumigenys jacobsoni – Baroni Urbani & De Andrade 2007: 122.

Material examined

VIETNAM – Đắk Nông Province • 1 worker; Nam Nung Reserve , Site 63; 12.1757° N, 107.76062° E; 907 m a.s.l.; 10 Jun. 2018; IBBL members leg.; Winkler; IBBL .

Measurements

Worker

TL 2.8, HL 0.68, HW 0.48, MandL 0.10, SL 0.34, EL 0.074, PW 0.27, ML 0.65, PL 0.37, PH 0.16, DPW 0.10, PPL 0.21, GL 0.75, CI 70, MI 14, SI 71, OI 15, LPI 43, DPI 26 (n= 1).

Geographic range

Indonesia (Borneo, Sumatra), Malaysia, Philippines, Vietnam (Đắk Nông).

New record for Vietnam.

Ecology

Collected in secondary forest, mature forest and rubber plantation.

Comments

The record of S. jacobsoni in southern Vietnam indicates that this species could be much more widespread throughout the Indochinese Peninsula than currently known. Its presence in neighboring countries such as Cambodia and Thailand is likely.

After careful examination of the species’ dentition, using specimens with opened mandibles, we determined that S. jacobsoni belongs to the newly introduced elegantula -complex in the S. leptothrix - group ( Fig. 2D ). Specimens from other localities should be checked if they share similar morphology.

Figures

Fig. 2. Mandible close-ups of workers from the elegantula-complex in the Strumigenys leptothrix-group. A–B. S. intermedia sp. nov. (TT01353). C. S. elegantula (Terayama & Kubota, 1989) from Hong Kong (RHL00290). D. S. jacobsoni Menozzi, 1939 from Vietnam (ANTWEB1011973).

Fig. 23. New species records of Strumigenys Smith, 1860 in full-face, profile and dorsal views. A–C. Worker of S. inhonesta Bolton, 2000 from Thailand (ANTWEB1011945). D–F. Worker of S. jacobsoni Menozzi, 1939 from Vietnam (ANTWEB1011973). G–I. Worker of S. juliae Forel, 1905 from Thailand (KCW-S08-sp03).