Strumigenys subedentata Mayr, 1887

Silva, Thiago Sanches Ranzani Da, Chaul, Júlio Cezar Mário & Feitosa, Rodrigo Machado, 2022, Lectotype designation and redescription of four commonly collected Neotropical species of Strumigenys (Hymenoptera: Formicidae), European Journal of Taxonomy 798 (1), pp. 103-126 : 119-123

Strumigenys subedentata Mayr, 1887

Figs 7–8

Strumigenys subedentata Mayr, 1887: 575 .

Strumigenys tristani Menozzi 1931: 273 , fig. 8 (synonymyzed by Brown 1960).

Strumigenys (Strumigenys) clavata Weber 1934: 32 , fig. 8 (synonymyzed by Brown 1960).

Pyramica kiranae Makhan 2007: 4 figs 7–8 (synonymyzed by Bolton et al. 2008).

Pyramica subedentata – Bolton 1999: 1673.

Strumigenys subedentata – Baroni Urbani & De Andrade 2007: 128.

Diagnosis

Strumigenys subedentata can be distinguished from other Neotropical species by the combination of five pairs of remiform setae on promesonotum ( Fig. 8B ), anterior area of fourth abdominal tergite reticulatepunctate ( Fig. 8C ), and anterior area of fourth abdominal sternite reticulate-punctate.

Type material

Lectotype (designated herein) (label information) ( Fig. 7 ) BRAZIL • “ St. Catharina Coll. G. Mayr ” [printed]; “Brit. Mus. 1922–501” [printed]; “ edentata ” [handwritten] “G. Mayr, Type” [printed]; “ BMNH ( E) 1013552 ” [printed]; “ ANTWEB CASENT 0900181 ” [printed]. “Syntype” [printed]. “ Strumigenys subedentata Mayr, 1887 LECTOTYPE” [printed]; NHMUK .

Paralectotypes (label information) BRAZIL • 1 worker; “ St. Catharina Coll. G. Mayr ” [printed; Syntype [printed]; “ Strumigenys subedentata Mayr, 1887 ” PARALECTOTYPE [printed]; NHMW-HYM4957 • 1 worker; same label information as for preceding; “ Strumigenys subedentata Mayr, 1887 PARALECTOTYPE ” [printed]; NHMW-HYM4958 • 1 worker; same label information as for preceding; NHMW-HYM4961 • 1 worker; same label information as for preceding; NHMW-HYM4962 • 1 worker; same label information as for preceding; NHMW-HYM4963 • 1 worker; same label information as for preceding; NHMW-HYM4964 • 1 worker; same label information as for preceding; NHMW-HYM4965 • 1 worker; “ St. Cath. Hetschko ” [printed]; “Syntype” [printed]; “ Strumigenys subedentata Mayr, 1887 ” PARALECTOTYPE [printed]; NHMW-HYM4959 • 1 worker; same label information as for preceding; NHMW-HYM4960 • 1 worker; “ St. Catharina Coll. G. Mayr ” [printed]; “126 Hetschko 1/984” [handwritten]; “ edentata ” [handwritten] “G. Mayr, Type” [printed]; “ Pyramica subedentata ” [handwritten] “det. B. Bolton 1999” [printed] “ ANTWEB CASENT 0915703 ” [printed]; “Syntype” [printed]. “ Strumigenys subedentata Mayr, 1887 PARALECTOTYPE ” [printed]. NHMW-HYM4956 • 1 worker; same label information as for lectotype; “ Strumigenys subedentata Mayr, 1887 PARALECTOTYPE ” [printed]; MCZT_28507 .

Additional material examined

BRAZIL – Amazonas • 1 worker; Manaus, Colosso Camp ; 12–21 Aug. 2016; B. Boudinot, L. Fernandes and J. Chaul leg.; CELC, ANTWEB1038944 . – Bahia • 1 worker; Itacaré ; 14°17′38.0″ S, 38°59′08.6″ W; 23 Aug. 2015; J. Chaul leg.; CELC, UFV-LABECOL-001969 . – Espírito Santo • 1 worker; Santa Teresa, Estação Biológica Santa Lúcia ; 19°57′58.4″ S, 40°32′21.2″ W; 30 Jan. 2015; T. Vargas leg.; CELC, UFV-LABECOL • 1 worker, 1 queen; near Reserva Biológica Córrego Grande; 18°14′11.3″ S, 39°49′12.1″ W; 21 Apr.–10 May 2017; N. Safar, C. Aquila and C. Guimarães leg.; Winkler; CELC, UFV-LABECOL-008544 . – Minas Gerais • 1 worker; Viçosa, Floresta Secundária ; Feb. 1994; Sperber, Louzada and Lopes leg.; CELC, UFV-LABECOL-001792 • 1 worker; same collection data as for preceding; CELC, UFV-LABECOL-001780 • 1 worker; Viçosa ; 13 Jan. 1998; S.M. Soares leg.; CELC, UFV-LABECOL-001771 • 1 worker; Viçosa, Mata da Biologia ; 20°45′26.67″ S, 42°51′39.07″ W; 706 m a.s.l.; Feb. 2013; J. Chaul leg.; CELC, UFV-LABECOL-001797 • 1 worker; Viçosa, Mata da Biologia ; 20°45′30.44″ S, 42°51′49.65″ W; 731 m a.s.l.; 5 May 2013; J. Chaul and N. Safar leg.; epigaeic Winkler; CELC, UFV-LABECOL-001802 • 1 worker, 1 queen; Viçosa, Mata do Paraíso ; 20°48′20.5″ S, 42°51′12.4″ W; 781 m a.s.l.; 2013; J. Chaul and R. Jesus leg.; Winkler; CELC, UFV-LABECOL-008225 • 1 worker; Viçosa, Mata do Seu Nico ; 20°47′43.8″ S, 42°50′51.8″ W; 750 m a.s.l.; 8 May 2013; J. Chaul and R. Jesus leg.; Winkler; CELC, UFV-LABECOL-008225 • 2 workers; Viçosa, Mata da Biologia ; 20°45′30″ S, 42°51′50.3″ W; 17 Aug. 2014; J. Chaul leg.; Winkler; CELC, UFV-LABECOL-001765 • 3 workers; Viçosa ; 20°46′07″ S, 42°52′02″ W; 17 Jul. 2015; J. Chaul, R. Jesus, F. Rezende and A. Orsetti leg.; Winkler; CELC, UFV-LABECOL-008593 • 1 worker; Santana de Patos, Fazenda Lagoa Formosa ; 18°51′45″ S, 46°34′17″ W; Feb. 2014; L-N- Paolucci leg.; CELC, UFV-LABECOL-001779 • 1 worker; São Tiago ; 20°57′09.69″ S, 44°26′32.09″ W; Feb. 2012; M. Padilha leg.; CELC, UFV- LABECOL-010751 • 1 worker; Ipaba, Reserva Particular do Patrimônio Natural Fazenda Macedônia , CENIBRA; Nov. 2005; T. Marques leg.; CELC, UFV-LABECOL-001798 • 1 worker; Conceição do Mato Dentro, Serra da Serpentina ; 19.03394°S, 43.33687°W; 1–7 Sep. 2010; R.R. Silva leg.; Winkler; CELC, UFV-LABECOL-010461 – Pará • 1 worker; Paragominas ; Jan.–Jul. 2011; R. Solar leg.; CELC, UFV-LABECOL-001804 • 1 worker, 1 queen; Primavera ; 01°00′36″ S, 47°07′04″ W; 5–6 Nov. 2018; L.P. Prado and K.L.S. Sampaio leg.; Winkler; CELC, UFV-LABECOL-010487 . – Paraná • 4 workers; Floresta Estadual do Palmito , km 28; 25°59′10.62″ S, 48°55′68.09″ W; 20 m a.s.l.; 28 Apr. 2016; J. Lattke leg.; DZUP. – Rio de Janeiro • 1 worker; Santa Maria Madalena, Horto Florestal ; 21°57′01.5″ S, 42°00′46.5″ W; 561 m a.s.l.; 30 Oct. 2016; S. Epifânio leg.; Winkler; CELC, UFV-LABECOL-007298 . – Santa Catarina • 1 worker, 1 queen; Florianópolis, Canto da Lagoa ; 27°32′01.2″ S, 48°27′30.3″ W; 15 Feb. 2016; J. Chaul leg.; CELC, UFV-LABECOL-002490 • 1 worker; same collection data as for preceding; CELC, UFV-LABECOL-008232 • 1 worker; same collection data as for preceding; CELC, UFV-LABECOL-008231 • 1 worker; Florianópolis, Lagoinha do Leste ; 27°46′31.0″ S, 48°29′06.0″ W; 18 Feb. 2016; J. Chaul leg.; CELC, UFV-LABECOL-008222 • 1 queen; same collection data as for preceding; CELC, UFV-LABECOL-008221 .

PERU – Madre de Dios • 1 worker; Puerto Maldonado, Reserva Nacional Tambopata ; 12°51′21″ S, 69°21′43″ W; 210 m a.s.l.; 19–31 Jul. 2012; R. Feitosa leg.; CELC, UFV-LABECOL-001789 .

Lectotype measurements

ABD4L 0.455; DPW 0.101; EL 0.054; HL 0.534; HT 0.324; HW 0.475; ML 0.306; PH 0.138; PL 0.283; PPL 0.141; PW 0.291; SL 0.267; WL 0.545; TL 2.264; CI 88.9; DPI 35.7; LPI 48.7; MI 57.3; OI 11.3; SI 56.2.

Paralectotype measurements

ABD4L 0.424; DPW 0.104; EL 0.054; HL 0.500; HT 0.300; HW 0.434; ML 0.282; PH 0.119; PL 0.243; PPL 0.146; PW 0.251; SL 0.242; WL 0.481; TL 2.076; CI 86.8; DPI 42.8; LPI 49.0; MI 56.4; OI 12.4; SI 55.8 (n = 1; CASENT 0915703).

Non-type measurements

ABD4L 0.410 –0.520; DPW 0.105 –0.290; EL 0.055 –0.075; HL 0.490 –0.575; HT 0.300 –0.350; HW 0.430 –0.520; ML 0.270 –0.310; PH 0.130 –0.160; PL 0.240 –0.290; PPL 0.100 –0.135; PW 0.185 – 0.310; SL 0.260 –0.300; WL 0.510 –0.610; TL 2.050 –2.440; CI 85.3–90.4; DPI 40.4–103.6; LPI 50.0– 58.5; MI 52.9–60.8; OI 12.8–15.1; SI 55.8–63.6 (n = 10).

Description

SCULPTURE. Head entirely reticulate-punctate, including antennal scrobe. Mesosoma entirely reticulatepunctate (see Comments). Fourth abdominal tergite reticulate-punctate near base ( Fig. 8C ). Length of basigastral costulae, in dorsal view, almost half length of postpetiole.

SETAE. Cephalic ground-setae remiform ( Fig. 8A ). Two pairs of remiform erect setae on cephalic dorsum; both pairs located on posterior third of cephalic dorsum, one pair nearer to occipital margin. Apicoscrobal setae remiform ( Fig. 8A ). Anterior margin of scape with one or more remiform setae curved towards antennal insertion. Humeral setae remiform ( Fig. 8B ). Four pairs of erect remiform setae (excluding humeral pair) on promesonotum ( Fig. 8B ). Setae on petiole, postpetiole and fourth abdominal tergite remiform.

HEAD. Masticatory margin of mandible with five preapical denticles ( Fig. 8A ; see Comments). Apex of mandible with two minute intercalary denticles ( Fig. 8A ). Anterior clypeal margin, in dorsal view, angular medially. Eye, in lateral view, with five to seven ommatidia along longest row. Eye located on

anterior half of head. In dorsal view, scape dorsoventrally flattened, expanded throughout its length. Third flagellomere smaller than fourth flagellomere; length of former almost half length of latter.

MESOSOMA. Humerus with small angular projection. Dorsum of mesonotum, in lateral view, convex, confluent with dorsum of pronotum. Metanotal groove relatively well impressed. Propodeal spine long and triangular, translucent, and linked to propodeal lobe by narrow lamella that extends throughout propodeal declivity. Femoral bulla small, ovate and located distally on dorsal margin of sclerite.

METASOMA. Petiolar node, in dorsal view, as long as wide; in lateral view, anterior margin almost as long as dorsal margin. Anterior margin of postpetiole, in dorsal view, slightly concave, almost straight. Lateral and ventral spongiform processes of petiole absent. Ventral spongiform lobe of postpetiole small. Lateral spongiform lobe of postpetiole small. Ventral basigastral spongiform pad reduced to curved (U-shaped in anterior view) carina.

Comments

Bolton (2000) considered S. subedentata as a member of the gundlachi complex (see Comments in S. denticulata ). The lectotype and the additional examined specimens did not show major morphological variation. Most specimens have an entirely reticulate-punctate katepisternum; however, some of them have a small but distinct smooth patch on the ventral-most area of the katepisternum. Although it is not possible to clearly determine if the katepisternum of the lectotype has a smooth patch based solely on images, direct observation of the physical specimen showed that this anatomical region is entirely sculptured (G. Broad pers. comm.).

In the lectotype specimen both mandibles possess five preapical teeth each (G. Broad pers. comm.), while in almost every non-type specimen observed in this study this number varied, in a symmetrical manner, from four to seven in each mandible. However, in a few specimens, we observed asymmetric variation in dentition count, which, despite not being a prevalent condition, it is a noteworthy variation.

Despite the wide range of occurrence of the species, the observed morphological traits did not presented a high variability degree, agreeing with Bolton’s (2000) own observations. Nonetheless, examination of specimens sampled in other ecosystems within the Neotropical region will provide a clearer understanding of morphological variation along the distribution range of S. subedentata , allowing for a better delimitation of the species’ boundaries in future revisionary endeavors.

Figures

Fig. 7. Lectotype ofStrumigenys subedentata Mayr, 1887 (CC-BY, CASENT0915703, Harald Bruckner, from www.antweb.org). A. Head, mandibles and antennae, in dorsal view. B. Full body, in lateral view. C. Full body, in dorsal view.

Fig. 8. Generalized schematics of Strumigenys subedentata Mayr, 1887, showing useful identification features. A. Head in dorsal view. B. Mesosoma, petiole, and postpetiole, in lateral view. C. Fourth abdominal tergite in dorsal view.