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Species: Mystrium camillae   Emery, 1889 

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Taxonomic History (provided by Barry Bolton, 2023)

Mystrium camillae Emery, 1889: 491, pl. 10, figs. 1-3 (w.q.) MYANMAR. Indomalaya. Primary type information: Type-material: lectotype worker (by designation of Yoshimura & Fisher, 2014 PDF: 47). Type-locality: lectotype Myanmar (“Birmania”): Bhamo, iv.1886 (L. Fea). Type-depository: MSNG. Type-specimen: CASENT0102123. Secondary type information: Paratype-material: 4 paralectotype workers. Paratype-locality: paralectotypes with same data as lectotype but dated either vi.1885, or iv.1886. Paratype-depositories: MHNG, MNHN, MSNG. Type notes: Yoshimura & Fisher, 2014 PDF: 47, observe that the original syntype queen could not be found. AntCat AntWiki HOL

Taxonomic history

Lectotype designation: Yoshimura & Fisher, 2014 PDF: 47.
// Distribution


  Geographic regions (According to curated Geolocale/Taxon lists):
    Asia: Borneo, Brunei, China, India, Indonesia, Malaysia, Myanmar, Philippines, Singapore, Vietnam
    Oceania: Australia, Papua New Guinea
  Biogeographic regions (According to curated Bioregion/Taxon lists):
    Australasia, Indomalaya

Distribution Notes:

Burma, Philippines (Luzon, Laguna), Sumatra, Vietnam, Malaysia, Indonesia, India -in my recent collections

Taxonomic Treatment (provided by Plazi)

Treatment Citation: Bihn, J. H. & Verhaagh, M., 2007, A review of the genus Mystrium (Hymenoptera: Formicidae) in the Indo-Australian region., Zootaxa 1642, pp. 1-12

Mystrium camillae EmeryHNS

Fig. 1-3, 10, 13

Mystrium CamillaeHNS [sic] Emery, 1889: 491, pl. 10, figs. 1-3. Syntype worker and queen: Myanmar (as "Birmania": Bhamd (Fea) [MCSN] (not examined; photographs of syntype worker and queen examined on AntWeb ( CASENT0102123 (worker), CASENT0102124 (queen)).

Mystrium camillae Emery subsp. javana KarawaiewHNS, 1925: 73, figs. 1 & 2. Syntype worker: Java, limestone mountain near Tjampea , no. 2389, 2 workers on the ground, under leaves (Karawaiew) (not examined). Synonymy by Brown, 1960: 170.

Mystrium camillaeHNS; Menozzi, 1929: 535-536, fig. 9. Revision of the genus and key to species.

Mystrium oculatumHNS Xu, 1998: 161, figs. 1 & 2. Holotype worker: China: Yunnan Province, Mengla County, Menglun Town, Bakaxiaozhai (Xu Zheng-hui) [SWFC] (not examined; photographs of paratype examined on AntWeb ( CASENT0104982 (worker)). New synonymy.

Material examined. Indonesia: Sumatra: Lampung, Tulang Bawang, Gn. Tanggang , 05°43.933' S, 105°06.598' E, 580m (1 worker, 9.VIII.2006, A. Riedel) [SMNK] GoogleMaps; Sumatra: Lampung, Tulang Bawang, Gn. Tanggang , 05°43.938' S, 105°06.440' E, 580m (5 workers, 9.VIII.2006, A. Riedel) [SMNK] GoogleMaps; Java: Jawa Barat, Ciamis, Gn. Sawal, Batu Cakra , 07°14'55' S, 108°15'46' E, 990m (1 worker, 1.X.2005, A. Riedel) [SMNK] GoogleMaps. Malaysia (West): Negri Sembilan, Simpang Pertang, Pasoh Forest Reserve , 02°59' N, 102°19' E (1 worker, 29.III.1992, K. Rosciszewski) [SMNK] GoogleMaps; Malaysia (West): Terengganu, Lake Kenyir GoogleMaps, 04°58' N, 102°49' E, 300-400m (22 workers, 7.-12.VII.2001, A. Schulz) [SMNK] GoogleMaps.

Measurements and indices. Workers: HL 0.81-1.75, HW 0.85-1.64, CI 88-105, SL 0.50-1.00, SI 54- 64, ML 0.52-1.75, WL 0.91-1.49, PW 0.47-0.80 (n = 31).

Diagnosis (worker). The following character combination differentiates M. camillaeHNS from all its congeners in the Indo-Australian region: the apex of each mandible distinctly expanded and rounded in lateral view, with a more or less triangular and caudally directed tip on the inner side; outer face of labrum entirely covered with a weakly developed, irregular rugoreticulum; maxillary palps 4-segmented; the second segment of the maxillary palp shorter than the basal (first) segment and less than half as broad as the basal segment; antennal segment III shorter than twice its width; each anterolateral corner of the head produced into a short, nearly triangular, pointed spine; dorsum of head with rugose-reticulate cuticular sculpture and spatulate hairs; minute compound eyes; petiolar node not broader than twice its length measured in dorsal view.

Distribution. Widely distributed in the Indo-Australian region and neighboring countries. Recorded from Australia, Brunei, China, India, Indonesia, Malaysia, Myanmar, Papua New Guinea, the Philippines and Singapore.

Comments. Brown (1960, p. 170) gave no justification for the synonymy of M. camillae subsp. javanaHNS under M. camillaeHNS but the differences between the taxa given in the description of Karawaiew (1925) fall within the variation of the senior synonym. The most important difference between the taxa - the shape of the mandible apex - depends on the angle from which the mandible is viewed. The triangular tip is highly variable in the specimens examined and often worn out. The number of truncated teeth at the anterior clypeal margin varies from 6-7 in the specimens we have seen and thus is not a character to distinguish the taxa. In most cases there is a toothless gap between the left and right group of these teeth (but see the specimens from Northern Australia depicted on AntWeb [ CASENT0172841, CASENT0172082 GoogleMaps]. From Karawaiew's description it is clear that he never had a specimen of M. camillaeHNS at hand but made his judgment of the species just from the description and the drawings of Emery (1889).

Xu (1998: 161, figs. 1 & 2) notes in his description of M. oculatumHNS that this species is close to M. camillaeHNS but differs from it by: "small eyes present; central dorsum of hat flat; metanotal groove only shallowly depressed; declivity of propodeum flat, not depressed; anterodorsal angle of petiolar node more extruding." All examined specimens of M. camillaeHNS possess minute compound eyes. The presence of eyes was already noted in the original description of M. camillaeHNS by Emery (1889) and again in Menozzi's revision. Therefore, the presence of eyes in M. oculatumHNS cannot be regarded as a diagnostic character to distinguish it from M. camillaeHNS. All other diagnostic characters given for M. oculatumHNS by Xu vary much among individuals of M. camillaeHNS. The morphology of M. oculatumHNS as described by Xu (1998: 161-162, figs. 1 & 2) and shown by photographs of a paratype of M. oculatumHNS on AntWeb ( CASENT0104982) falls well within the range of morphological variation exhibited by the examined specimens of M. camillaeHNS. Additionally, all but one metric character of M. oculatumHNS fall into the range of M. camillaeHNS. The exception is CI, which is slightly higher.

Specimen Habitat Summary

Found most commonly in these habitats: 20 times found in Rainforest, 1 times found in K mixed beach forest, 2 times found in wet forest, 3 times found in lowland rainforest, 2 times found in rain forest, 1 times found in montane forest, 1 times found in 2nd growth wet forest, 1 times found in degraded rainfoest, 1 times found in seasonal rainforest, 1 times found in degraded rainforest, ...

Found most commonly in these microhabitats: 4 times litter, 2 times ex rotten log, 2 times ex sifted leaf litter, 3 times under stone, 3 times soil pocket on limestone rock, 2 times sifted litter (leaf mold, rotten wood), 3 times rotten wood, 1 times emergence trap, 1 times Sieved Litter, 1 times nest in wet rotten log, 1 times ex soil next to root, ...

Collected most commonly using these methods: 3 times Winkler, 4 times Berlesate, 1 times W53-5, C88 54-1, C88 53-5, 1 times emergence trap, 1 times 3 MaxiWinklers, 2 times Suspended (2.5 m) pitfall under white light, 2 times m2 Winkler sifting, 1 times QM Berlesate No. 697, 2 times Random coll. Winkler sifting, 1 times Site LTR8, 1 times 6L sifted litter, extracted in Winkler sack over 72 hours, ...

Elevations: collected from 6 - 1100 meters, 480 meters average

Collect Date Range: collected between 1886-04-01 00:00:00.0 and 2014-07-31 00:00:00.0

Type specimens: Lectotype of Mystrium camillae: casent0102123; Not Provided: casent0717688, casent0717689, casent0717690, casent0717691; paralectotype of Mystrium camillae: casent0101450, casent0101784, casent0101809, casent0102124; paratype of Mystrium oculatum: casent0104982; syntype of Mystrium camillae: casent0903790; syntype of Mystrium camillae javana: casent0916795

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