Nylanderia steinheili

Nylanderia steinheili
Scientific classification
Kingdom:	Animalia
Phylum:	Arthropoda
Class:	Insecta
Order:	Hymenoptera
Family:	Formicidae
Subfamily:	Formicinae
Tribe:	Lasiini
Genus:	Nylanderia
Species:	N. steinheili
Binomial name
Nylanderia steinheili (Forel, 1893) Specimen labels
Synonyms
Prenolepis steinheili minuta Forel, 1893

At a Glance

• Invasive

Identification

LaPolla and Kallal (2019) - Dark brown, contrasting sharply with white trochanters and meso/metacoxae; mesosomal dorsum and gastral tergite 1 with moderate to dense pubescence.

Compare with: Nylanderia guatemalensis

Nylanderia steinheili is a widespread species, which may or may not be native to the West Indies. There is considerable morphological variation in what we are calling N. steinheili. This species is putatively found in Central and South America as well so it is hoped that as revisions of Nylanderia in those regions are completed further data for better refinement of the morphological limits of this species will be possible. Nylanderia steinheili and N. guatemalensis are broadly sympatric across the West Indies with both occurring primarily in similarly disturbed habitats. Usually both can be separated relatively easily based on worker body coloration, with N. steinheili being dark brown to black and N. guatemalensis being yellow to light brown (typically with contrasting dark macrosetae). However, particularly in southern Florida and the Bahamas, N. guatemalensis can have a darker body, sometimes approaching dark brown. This can make distinguishing the species difficult. N. guatemalensis and N. steinheili both occur in Florida in contrast to Kallal and LaPolla (2012) which only reported N. steinheili. Apparently, N. guatemalensis occurs only in the extreme southern part of the state, whereas N. steinheili is more widespread. We found N. guatemalensis workers have a SI above 120 while N. steinheili worker have a SI below 120, but there is some overlap. Like N. steinheili, N. guatemalensis putatively ranges into Central and South America. We did examine the penial sclerites for both N. steinheili and N. guatemalensis males. Overall the penial sclerites are fairly similar in basic structure but there are some importance differences. The anteroventral process of N. steinheili is emarginate, whereas in N. guatemalensis it is broadly rounded. Additionally, the penial sclerite vulvurae are ventrally placed in N. steinheili; in N. guatemalensis they are at the midline of the penial sclerites. As in worker morphology, the male morphology suggests these species are closely related, perhaps even sister taxa. It is important to note we examined a relatively small number of males and both of these species range far outside of the West Indies where male morphology needs to be examined as well.

Identification Keys including this Taxon

• Key to Nearctic Nylanderia workers
• Key to Nearctic Nylanderia males

Distribution

Latitudinal Distribution Pattern

Latitudinal Range: 20.85574444° to -19.805°.

North Temperate	North Subtropical	Tropical	South Subtropical	South Temperate

• Source: AntMaps

Distribution based on Regional Taxon Lists

Malagasy Region: Seychelles.
Nearctic Region: United States.
Neotropical Region: Brazil, Colombia, Costa Rica, Cuba, Dominican Republic, Ecuador, Galapagos Islands, Greater Antilles, Grenada, Guadeloupe, Guatemala, Haiti, Honduras, Lesser Antilles, Mexico, Netherlands Antilles, Panama, Puerto Rico, Trinidad and Tobago, Venezuela.

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

Worker

.

Images from AntWeb

Worker. Specimen code casent0173233. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by CDRS, Galapagos, Ecuador.

Worker. Specimen code casent0102943. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by NHMUK, London, UK.

.

Queen

Images from AntWeb

Queen (alate/dealate). Specimen code casent0173235. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by CDRS, Galapagos, Ecuador.

Queen (alate/dealate). Specimen code casent0101622. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by MHNG, Geneva, Switzerland.

Male

LaPolla and Kallal 2019. Figure 92–96. Nylanderia steinheili male USNMENT00753664. Full-face and lateral of the body; SEM images of external genitalia: ventral, close-up vollsellar lobes, dorsal, and lateral.

Images from AntWeb

Queen (alate/dealate). Specimen code casent0173234. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by CDRS, Galapagos, Ecuador.

Male (alate). Specimen code casent0101675. Photographer April Nobile, uploaded by California Academy of Sciences.	Owned by MHNG, Geneva, Switzerland.

Nomenclature

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

• steinheili. Prenolepis steinheili Forel, 1893g: 342 (w.) ANTILLES. Forel, 1908b: 64 (q.); Forel, 1912i: 66 (m.). Combination in Pr. (Nylanderia): Forel, 1912i: 66; in Paratrechina (Nylanderia): Emery, 1925b: 223; in Nylanderia: Kempf, 1972a: 168; in Paratrechina: Brandão, 1991: 367; in Nylanderia: LaPolla, Brady & Shattuck, 2010a: 127. Current subspecies: nominal plus minuta (unresolved junior homonym). Senior synonym of minuta: LaPolla & Kallal, 2019: 437.
• minuta. Prenolepis steinheili var. minuta Forel, 1893g: 343 (w.q.m.) ANTILLES.
  • [Unresolved junior primary homonym of Prenolepis imparis var. minuta Emery, 1893i: 636 (Bolton, 1995b: 314).]
  • Combination in Pr. (Nylanderia): Forel, 1912i: 66; in Paratrechina (Nylanderia): Emery, 1925b: 223; in Nylanderia: Kempf, 1972a: 168; in Paratrechina: Brandão, 1991: 367; in Nylanderia: LaPolla, Brady & Shattuck, 2010a: 127.
  • Junior synonym of steineili: LaPolla & Kallal, 2019: 437.

Description

Worker

Reine. L. 2, 1 a 2, 4 mill. Mandibules armees de 6 dents, luisantes, avec quelques stries et quelques points epars. Tete ovale•rectaugulaire, aussi large devant que derriere. Les scapes depassent le bord posterieur de la tete d'1/3 environ de leur longueur. Epistome a peine concave au milieu de son bord anterieur. Thorax assez robuste, profondement echancre entre le mesonotum et le metanotum. L'echancrure est presque aussi large au fond qu'un peu plus haut, c'est a dire qu'elle a au fond une courte surface plus ou moins plane, non pas seulement une simple ligne transversale, et que ses bords s'elevent d'une facon abrupte, subverticale, tant vers le mesonotum que vers le metanotum. Au fond de l'echancrure sont deux stigmates presque aussi gros que l'intervalle qui les separe l'un de l'autre. La metanotum est en bosse arrondie et presque aussi eleve que le mesonotum; sa face basale est un peu plus courte que sa face declive dont on peut a peine la distinguer.

Ecaille, face declive du metanotum, cotes du thorax, epistome et parfois une partie du pronotum lisses, luisants, et glabres. Le reste ponctue, mediocrement pubescent et subopaque.

Les soies dressees ont la repartition ordinair6 sur le corps, les pattes et les antennes. Elles sont plus epaisses et plus obtuses que chez les formes precedentes, d'un brun noiratre.

D'un noir brun on parfois d'un brun noir. Thorax et pedicule souvent d'un brun plus clair. Antennes, mandibules et pattes brunates. Tarses, articulations des pattes, hanches et anncaux femoraux d'un jaune tres pale, parfois meme blanchatre. La taille varie tres peu.

LaPolla and Kallal (2019) - (n=12): TL:1.70–2.30; HW: 0.49–0.57; HL: 0.57–0.67; EL: 0.14–0.19; SL: 0.63– 0.84; WL: 0.71–0.88; GL: 0.69–0.96. SMC: 12–23; PMC: 2–4; MMC: 2–3. indices: CI: 81–91; REL: 22–30; SI: 118–155; SI2: 17–24.

Head: sides of head in full face view nearly parallel to rounded; posterolateral corners rounded; posterior margin straight, sometimes slightly emarginate medially; anterior clypeal margin nearly straight to slightly emarginate; median ocellus sometimes present; eyes well-developed. Mesosoma: in lateral view, pronotum convex; anterior margin of mesonotum raised slightly above posterior pronotal margin; metanotal area without short flat area before spiracle; dorsal face of propodeum slightly convex; dorsal face of propodeum and mesonotum approximately the same height or propodeum slightly lower than mesonotum in lateral view. Color and pilosity: body dark brown, trochanters, mesocoxa and metacoxae white; antennae and mandible lighter brown than head, mesosoma and gaster; pubescence abundant across body except mesopleuron and lateral portions of pronotum which are without pubescence.

Queen

LaPolla and Kallal (2019) - (n=3): TL: 3.20–3.40; HW: 0.73–0.78; HL: 0.73–0.78; EL: 0.23–0.24; SL: 0.79–0.89; WL: 1.20–1.30; GL: 1.50–1.80. SMC: 10–12; PMC: 3–6; MMC: 11–12. indices: CI: 99–105; REL: 31–33; SI: 107–119.

Generally, as in worker with modifications expected for caste.

Male

LaPolla and Kallal (2019) - (n=3): TL: 1.70–1.96; HW: 0.52–0.53; HL: 0.50–0.52; EL: 0.19–0.20; SL: 0.62–0.71; WL: 0.75–0.80; GL: 0.70–0.80. SMC: 8–14; PMC: 0; MMC: 10–16. indices: CI: 99–106; REL: 37–39; SI: 119– 133.

Head: sides of head in full face view rounded; posterior margin rounded; clypeus nearly straight anteriorly; mandible with distinct apical tooth and much smaller, often indistinct, subapical tooth adjacent to apical tooth; basal angle indistinct. Mesosoma: in lateral view, dorsal margin of mesoscutum same as height as dorsal margin of mesoscutellum; propodeum steeply sloping without distinct dorsal and declivitous faces. Genitalia: gonopod apex coming to triangular point in lateral view; gonopod margin in dorsal view curves away from penial sclerite; digitus with pointed apex that bends away from penial sclerite; cuspis tubular, rounded at apex bending sharply toward digitus; anteroventral process of penial sclerite coming to point with ventral margin of process emarginate; valvura of penial sclerite placed ventral to midline (fig. 105). Color and pilosity: body typically dark brown with contrasting yellow-white to yellowish-brown (typically not as light as in workers) trochanters, and mesocoxa and metacoxa; antenna and mandible lighter brown than head, mesosoma and gaster; pubescence abundant across body except on mesopleuron which is without pubescence.

Type Material

Antille de St. Thomas (moi-meme), Guatemala (Dr. Stoll).

LaPolla and Kallal (2019) - Lectotype worker, ST. THOMAS, Antilles, 13.X.78 (examined) (Musee d'Histoire Naturelle Genève). Lectotype designated by Trager, 1984.

References

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