Strumigenys tumida

Strumigenys tumida
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Myrmicinae
Tribe:	Attini
Genus:	Strumigenys
Species:	S. tumida
Binomial name
Strumigenys tumida Bolton, 2000 Specimen Labels
Synonyms
Strumigenys wheeleri Mann, 1921

The dozen or so known records of this species are all from forest habitats and, when noted, were found in litter samples.

Identification

Bolton (2000) - A member of the signeae complex in the Strumigenys godeffroyi-group. Immediately diagnostic of tumida is its very swollen postpetiole disc, reminiscent of the condition seen in the Neotropical godmani. See notes under Strumigenys mailei.

Sarnat and Economo (2012) - Strumigenys tumida belongs to the signeae complex, and can be distinguished by other species in that group by the extremely swollen postpetiole, which is conspicuously twice as broad as the petiole in dorsal view. See the identification notes under Strumigenys mailei for additional discussion of the Fijian members of the signeae complex.

Keys including this Species

• Key to Neotropical Strumigenys (as Pyramica)
• Key to Strumigenys of East Asia

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: -17.8° to -17.8°.

North Temperate	North Subtropical	Tropical	South Subtropical	South Temperate

• Source: AntMaps

Distribution based on Regional Taxon Lists

Indo-Australian Region: Fiji (type locality).

Distribution based on AntMaps

Distribution based on AntWeb specimens

Check data from AntWeb

Countries Occupied

Number of countries occupied by this species based on AntWiki Regional Taxon Lists. In general, fewer countries occupied indicates a narrower range, while more countries indicates a more widespread species.

Estimated Abundance

Relative abundance based on number of AntMaps records per species (this species within the purple bar). Fewer records (to the left) indicates a less abundant/encountered species while more records (to the right) indicates more abundant/encountered species.

Castes

Strumigenys  X-ray micro-CT scan 3D model of Strumigenys tumida (worker) prepared by the Economo lab at OIST.

See on Sketchfab. See list of 3D images.

Nomenclature

The following information is derived from Barry Bolton's Online Catalogue of the Ants of the World.

• wheeleri. Strumigenys wheeleri Mann, 1921: 466, fig. 24 (w.q.) FIJI IS. [Junior secondary homonym of Epitritus wheeleri Donisthorpe, above.] Replacement name: tumida Bolton, 2000: 830.
• tumida. Strumigenys tumida Bolton, 2000: 830. Replacement name for Strumigenys wheeleri Mann, 1921: 466. [Junior secondary homonym of Epitritus wheeleri Donisthorpe, 1916a: 121 (now in Strumigenys).]

Unless otherwise noted the text for the remainder of this section is reported from the publication that includes the original description.

Description

Worker

TL 3.8, HL 1.02, HW 0.65-0.69, CI 64-68, ML 0.44, MI 43, SL 0.66, SI 96-102, PW 0.44-0.46, AL 1.05-1.08 (2 measured). Preapical tooth on mandible shorter than maximum width of mandible. Dorsolateral margin of head with 3-4 freely dorsolaterally projecting short stiff simple hairs, without flagellate hairs. Cephalic dorsum with a pair of short erect hairs near highest point of vertex and a transverse row of 6 similar hairs along the occipital margin. Dorsum of head reticulate-punctate, overlaid by weak reticulate-rugulose sculpture posteriorly. Apical antennomere spindle-shaped, slender and narrowed basally. Scrobe vestigial behind level of eye, merely a flattening of the surface, not concave and without sharply defined margins. Entire alitrunk, dorsally and laterally, reticulate-punctate, or at most with a smooth patch on katepistemum; with a few weak rugulae dorsolaterally and laterally on pronotum. Pronotal humeral hair short and stiff, slightly curved; pronotal dorsum with a pair of short erect hairs between the humeral pair and with 3 similar pairs on the mesonotum. First gastral tergite with short stiff erect simple hairs only. Dorsal surfaces of femora, tibiae and basitarsi without long erect freely projecting filiform or flagellate hairs. Propodeal teeth short, triangular and acute; declivity with a carina but not lamellate. Petiole node in dorsal view longer than broad; lateral spongiform lobes of petiole very short, restricted to posterolateral angles. Petiole in profile subclaviform, the node with a long, low shallowly convex dorsum. Disc of postpetiole densely and very sharply reticulate-punctate, strikingly swollen, its maximum length ca 0.32, width ca 0.45; in dorsal view spongiform tissue does not project beyond lateral outline of disc. Ventral spongiform lobe of postpetiole massive, with a pocket in its outer face; base of first gastral sternite without trace of spongiform tissue. Basigastral costulae extend about one-third length of tergite and slope from the base obliquely toward the midline.

Type Material

Syntype workers and queen, FIJI IS: Viti Levu, Nadarivatu (W. M. Mann) (Museum of Comparative Zoology) [examined].

Determination Clarifications

The species identified as Strumigenys wheeleri Mann (now Strumigenys tumida) by Dlussky (1993) is properly referred to Strumigenys daithma (see there).

References

• Bolton, B. 2000. The ant tribe Dacetini. Memoirs of the American Entomological Institute. 65:1-1028. (page 830, replacement name for Strumigenys wheeleri Mann, 1921; worker described: see daithma)
• Liu, C., Sarnat, E.M., Friedman, N.R., Hita Garcia, F., Darwell, C., Booher, D., Kubota, Y., Mikheyev, A.S., Economo, E.P. 2020. Colonize, radiate, decline: Unraveling the dynamics of island community assembly with Fijian trap‐jaw ants. Evolution 74, 1082–1097 (doi:10.1111/EVO.13983).
• Mann, W. M. 1921. The ants of the Fiji Islands. Bulletin of the Museum of Comparative Zoology 64: 401-499 (page 466, as Strumigenys wheeleri; worker and queen described; fig. 24)
• Sarnat, E. M. and Economo, E. P. 2012. The ants of Fiji. University of California Publications in Entomology. 132:1-384.
• Sarnat, E.M., Hita-Garcia, F., Dudley, K., Liu, C., Fischer, G., Economo, E.P. 2019. Ready species one: Exploring the use of augmented reality to enhance systematic biology with a revision of Fijian Strumigenys (Hymenoptera: Formicidae). Insect Systematics and Diversity 3(6): 6; 1–43 (doi:10.1093/isd/ixz005).

References based on Global Ant Biodiversity Informatics

• Bolton, B. 2000. The Ant Tribe Dacetini. Memoirs of the American Entomological Institute 65
• Dlussky G.M. 1994. Zoogeography of southwestern Oceania. Zhivotnoe naselenie ostrovov Iugo-Zapadnoi Okeanii ekologo-geograficheskie issledovanii 48-93.
• Mann W. M. 1921. The ants of the Fiji Islands. Bulletin of the Museum of Comparative Zoology 64: 401-499.
• Sarnat Eli M. 2009. The Ants [Hymenoptera: Formicdiae] of Fiji: Systematics, Biogeography and Conservation of an Island Arc Fauna. 80-252
• Ward, Darren F. and James K. Wetterer. 2006. Checklist of the Ants of Fiji. Fiji Arthropods III 85: 23-47.
• Wheeler W.M. 1935. Check list of the ants of Oceania. Occasional Papers of the Bernice Pauahi Bishop Museum 11(11):1-56.
• Wheeler, William Morton.1935.Checklist of the Ants of Oceania.Occasional Papers 11(11): 3-56
• Wilson E.O., and G.L. Hunt. 1967. Ant fauna of Futuna and Wallis islands, stepping stones to Polynesia. Pacific Insects 9(4): 563-584.
• Wilson, Edward O. and George L. Hunt. 1967. Ant Fauna of Futuna and Wallis Islands, Stepping Stones To Polynesia. Pacific Insects. 9(4):563-584.
• Wilson, Edward O. and Hunt, George L. Jr. 1967. Ant Fauna of Futuna and Wallis Islands, Stepping Stones to Polynesia. Pacific Insects. 9(4):563-584