Monomorium rothsteini

Sparks, Kathryn S., Andersen, Alan N. & Austin, Andrew D., 2014, Systematics of the Monomorium rothsteini Forel species complex (Hymenoptera: Formicidae), a problematic ant group in Australia, Zootaxa 3893 (4), pp. 489-529: 496-497

publication ID

http://dx.doi.org/10.11646/zootaxa.3893.4.2

publication LSID

lsid:zoobank.org:pub:65D00761-21AC-4B5D-ACB9-7BFFC69A75FC

DOI

http://doi.org/10.5281/zenodo.5683106

persistent identifier

http://treatment.plazi.org/id/03A50973-7E32-2F41-EBF2-FDA44B9275C5

treatment provided by

Plazi

scientific name

Monomorium rothsteini
status

 

Key to species of the M. rothsteini   species complex.

This key is designed for the identification of the majority of the most commonly encountered species in the M. rothsteini   complex. All of these species, with the exception of M. leda   , were recognised as separately evolving lineages in the mitochondrial DNA analysis of Sparks et al. (2014). The phylogenetic tree from that study is reproduced in Fig. 3 View FIGURE 3 with the molecular clades labelled with the corresponding species names. Additional morphotypes are known to exist within the complex, but there is insufficient evidence available at this time to formally describe them. For species identifications that are particularly important it is strongly recommended that the CO 1 sequence data are obtained and compared with those deposited in Genbank. All species exhibit some level of intraspecific variation that can in some cases lead to incorrect identification when using this key. It is recommended that a range of specimens from a colony are examined to determine the character state that best represents the majority of specimens.

1. Anterodorsal margin of the clypeus deeply concave, anterolateral carinae produced as acute angles, often with a wavy margin or minute preapical teeth medial to the acute angles ( Fig. 4 View FIGURE 4 h, 6 e, 6 h, 7 k).......................................... 2

- Anterodorsal margin of the clypeus not as above, may be concave but without acute anterolateral angles or preapical teeth... 5

2. Petiole node, postpetiole and anterior half of T 1 completely covered in a fine reticulate pattern; very large, robust species (HW and ML> 1mm for a majority of specimens).......................................................... merepah  

- Petiole and postpetiole with a fine reticulate pattern that does not extend onto dorsal surface; smaller species (HW and ML <1mm for a majority of specimens)........................................................................ 3

3. First metasomal tergite (T 1) with fine reticulate sculpture restricted to anterior third......................... maryannae  

- T 1 with fine reticulate sculpture covering at least anterior half.................................................. 4

4. A majority of specimens with mesonotum sculpture present over entire area posteriad of promesonotal suture, sculpture consisting of longitudinal rows of shallow alveolae, rarely with a small central area without sculpture; known only from the Kimberley region of Western Australia.................................................................. stagnum  

- Mesonotum sculpture restricted to promesonotal suture, posterior mesonotum and lateral curvature; central area always smooth; known only from the Cape York area of Queensland............................................. capeyork  

5. Anterodorsal margin of the clypeus distinctly concave, with frontolateral carinae forming angular ridges that extend beyond anteroventral clypeal margin, forming obtuse angles ( Fig. 5 View FIGURE 5 h, 5 n, 8 b)............................................ 6

- Anterodorsal margin of the clypeus sinuous to almost straight, frontolateral carinae forming smooth ridges that do not extend beyond anteroventral clypeal margin ( Fig. 4 View FIGURE 4 a, 4 k, 8 e)........................................................ 15

6. Mesonotum sculptured over most of area posteriad of promesonotal suture ( Fig. 6 View FIGURE 6 l), propodeum in lateral view with dorsolateral angles almost forming a right angle, such that propodeum appears cuboid ( Fig. 6 View FIGURE 6 j)........................ mitchell  

- Mesonotum with sculpture restricted to at most posterior half of area posteriad of promesonotal suture; propodeum in lateral view with dorsolateral angles forming an obtuse angle or rounded ( Fig. 5 View FIGURE 5 g, 7 a)..................................... 7

7. T 1 with fine reticulate sculpture over at least anterior quarter; coarse lateral cephalic strigae reaching anterior margin of eye. 8

- T 1 without sculpture, smooth and shining; coarse lateral cephalic strigae may or may not reach anterior margin of eye.... 10

8. Anteroventral margin of the clypeus without an anterior median projection, petiole node broadly rounded in posterior view........................................................................................... humilior   (part)

- A majority of specimens with a median projection on the anteroventral margin of the clypeus; petiole node tapering to a rounded point in posterior view.......................................................................... 9

9. Mesonotum strigulate on lateral curvature, in metanotal groove and extending onto posterior mesonotum ( Fig. 7 View FIGURE 7 c); petiole node narrow, width less than 2 x eye width when viewed from above; longitudinal strigae absent from dorsal surface of propodeum ( Fig. 7 View FIGURE 7 c); known only from the Pilbara   region of Western Australia.................................... pilbara  

- Mesonotum almost entirely smooth, a few strigulae on posterior and lateral portions of posterior mesonotum ( Fig. 5 View FIGURE 5 i); petiole node of medium breadth, between 2 and 2.5 x eye width when viewed from above; propodeal longitudinal strigae very weakly present as broken lines on posterior half only; known from the Victoria River district of the Northern Territory.... hoffmanni  

10. Coarse lateral cephalic strigae not reaching anterior eye margin and transverse strigae absent from dorsal surface of propodeum

( Fig. 4 View FIGURE 4 f, 5 o)......................................................................................... 11 - At least some coarse lateral cephalic strigae reaching anterior eye margin; propodeal transverse strigae present on dorsal surface, although may be very weak ( Fig. 7 View FIGURE 7 f, 6 o, 8 c)........................................................... 13

11. Medium to large species (ML> 1mm) with medium to small eyes (EW <0.23 x LHW).......................... leda  

- Relatively small species (ML <1 mm) with large eyes (EW> 0.23 x LHW)...................................... 12

12. Petiole node without sculpture and narrow (<2 x eye width when viewed from above); head and mesosoma light to dark brown with a reddish-orange tinge; anteroventral margin of the clypeus with a small median projection........ broschorum  

- Petiole node with fine reticulate sculpture laterally and a long posterobasal margin, of medium breadth (2–2.5 x eye width when viewed from above); head, mesosoma and legs amber orange to orange brown; anteroventral margin of the clypeus rarely with a small median projection................................................................. kidman  

13. Longitudinal strigae absent from dorsal surface of propodeum and longitudinal depression very shallow or absent; propodeum appears dorsally rounded ( Fig. 7 View FIGURE 7 f), dorsolateral angles of the propodeum rounded; petiole node of medium breadth (2–2.5 x eye width when viewed from above)............................................................... rothsteini  

- Longitudinal strigae present on dorsal surface of propodeum either as raised convergent ridges or irregular convergent lines; longitudinal depression present; petiole node narrow (<2 x eye width when viewed from above)...................... 14

14. Longitudinal strigae on the dorsal surface of the propodeum converging anteriorly, forming a triangle with a carina that extends between the dorsolateral angles ( Fig. 8 View FIGURE 8 c); head, mesosoma and legs dark chestnut brown, except trochanters light brown; known only from the Pilbara   region of Western Australia........................................ tenebrosum  

- Longitudinal strigae on the dorsal surface of the propodeum not forming a triangle, carina absent between the dorsolateral angles; head and mesosoma dark brown with a reddish-orange tinge; known only from the stony plains region of northern South Australia............................................................................... oodnadatta  

15. Dorsolateral angles of the propodeum almost forming a right angle, such that the propodeum appears cuboid ( Fig. 4 View FIGURE 4 j, 5 a); propodeum laterally alveolate with irregular strigae extending onto dorsal surface or on posterior half of lateral surface; mesopleuron with at least a few strigae extending anteriorly from metapleural groove.............................. 16

- Dorsolateral angles of the propodeum clearly forming an obtuse angle ( Fig. 4 View FIGURE 4 a, 5 a), laterally alveolate without irregular strigae extending onto dorsal surface or on posterior half of lateral surface; mesopleuron with or without strigae............... 17

16. Mesonotum strigate-rugose over most of surface posteriad of promesonotal suture ( Fig. 4 View FIGURE 4 l, 4 o); sculpture on frons absent, a few strigae present only on antennal lobes ( Fig. 4 View FIGURE 4 k, 4 n); petiole node narrow, <2 x eye width when viewed from above; colour of head and mesosoma predominantly dark chestnut brown...................................... eremum   / eremoides  

- Mesonotum rugulose-strigate on lateral curvature and in metanotal groove, smooth medially ( Fig. 5 View FIGURE 5 c, 8 f); frons with strigae that extend well above antennal lobes ( Fig. 8 View FIGURE 8 e); petiole node broad,> 2.5 x eye width when viewed from above ( Fig. 5 View FIGURE 5 a); colour of head and mesosoma predominantly dark amber orange................................. geminum   /topendese

17. T 1 with a fine reticulate pattern over at least anterior third; colour of head and mesosoma predominantly dark amber orange 18

- T 1 without sculpture, smooth and shining; colour of head and mesosoma predominantly light to dark brown, sometimes with a reddish tinge........................................................................................ 19

18. Petiole node of medium breadth, 2–2.5 x eye width when viewed from above; a majority of specimens with fine reticulate sculpture restricted to anterior half or less; known only from the central desert region of the Northern Territory humilior   (part)

- Petiole node width broad,> 2.5 x eye width when viewed from above; all specimens with T 1 completely covered in a fine reticulate pattern; known only from Cape York Peninsula................................................. hertogi  

19. Anterior transverse carina prominent on propodeum.................................................... bogischi  

- Anterior transverse carina on propodeum very weak or absent................................................. 20

20. Dorsal surface of propodeum with a shallow longitudinal depression that runs most of its length; a majority of specimens without sculpture on the posterior mesonotum ( Fig. 8 View FIGURE 8 i)...................................................... torrens  

- Dorsal surface of the propodeum appears flat or slightly rounded along most of its length, a depression present only between posterodorsal angles; a majority of specimens finely strigulate on posterior mesonotum ( Fig. 7 View FIGURE 7 i, 7 o)... speculum   / subapterum  

DNA

Department of Natural Resources, Environment, The Arts and Sport