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(Figs 82 – 84)
Ponera coarctata st. natalensis SantschiHNS, 1914c: 7. Syntype workers, SOUTH AFRICA: Natal, Richmond, 25.iii.05 (I. Trågärdh) (NHMB) [examined]. [Combination in Ponera (Hypoponera)HNS and raised to species: Santschi, 1938: 79; in HypoponeraHNS: Taylor, 1967: 12.]
WORKER. Measurements: HL 0.62 – 0.69, HW 0.48 – 0.57, HS 0.555 – 0.630, SL 0.42 – 0.50, PrW 0.38 – 0.42, WL 0.82 – 0.92, HFL 0.40 – 0.50, PeNL 0.16 – 0.18, PeH 0.36 – 0.44, PeNW 0.26 – 0.32, PeS 0.260 – 0.313 (12 measured). Indices: CI 76 – 83, SI 84 – 90, PeNI 68 – 76, LPeI 41 – 47, DPeI 160 – 187.
Eyes vestigial to absent, usually represented by a small, depigmented spot that appears to be the remnant of a single ommatidium; sometimes no trace of an eye spot. In full-face view apex of scape, when laid straight back from its insertion, just fails to reach, or just touches, the midpoint of the posterior margin; SL/HL 0.67 – 0.73. Reticulate-punctulate sculpture of cephalic dorsum fine, but head more densely sculptured than pronotal dorsum. Lateroventral surfaces of head with extremely feeble punctate sculpture, merely of separated small superficial punctures on an otherwise smooth surface. With mesosoma in dorsal view the metanotal groove is usually, but not always, vestigially represented by a faint transverse line that indicates the junction of the mesonotum and propodeum , but never with a strong impression that interrupts the surface; sometimes without trace of the metanotal groove. Propodeal declivity separated from sides by blunt marginations. Mesopleuron smooth and shining. Petiole in profile with the node relatively short and high, the anterior and posterior faces parallel, not convergent dorsally; dorsal surface broadly convex. Subpetiolar process with a low, blunt, ventral angle that is usually obtuse. Posterior surface of petiole node with a shallow transverse groove or impression above the peduncle, the upper margin of the impression appears as a transverse dark line or ridge in posterodorsal view. Each end of the impression usually terminates in a short oblique ridge that is visible in profile, but there are no cuticular ridges radiating upwards into the impression from the posterior peduncle. Maximum width of first gastral tergite in dorsal view slightly less than the width of the second tergite at its midlength. Base of cinctus of second gastral tergite with strong, dense cross-ribs. Posttergite of second gastral segment, from posterior margin of cinctus to apex, distinctly broader than long. Disc of second gastral tergite shallowly reticulate-punctate to microreticulate. With first gastral segment in profile the dorsum with sparse short standing setae. Full adult colour yellowish brown to light brown.
H. natalensisHNS and austraHNS share the character of having a transverse impression across the base of the posterior face of the petiole node, above the peduncle. The impression is not deep and may be difficult to discern in direct posterior view, but in posterodorsal view its upper margin appears as a dark line, located well above the peduncle. In natalensisHNS the impression terminates at either side in a short oblique cuticular ridge that is usually clearly visible in profile, but this may be missing in austraHNS. A similar transverse impression can be seen in exiguaHNS and traegaordhi , but in these the impression is spanned by a series of short cuticular ridges that radiate upward from the posterior peduncle. The radiating ridges of exiguaHNS and traegaordhiHNS are convergent on the species related to jeanneliHNS and hebesHNS, but in these the ridges are directly on the flat posterior surface and are not confined within an impression that has a sharply delineated upper margin.
H. natalensisHNS and austraHNS are best separated by the condition of the petiole, which in natalensisHNS is shorter and higher in profile (LPeI 41 – 47) and distinctly broader in relation to its length in dorsal view (DPeI 160 – 187), than in austraHNS (LPeI 47 – 56, DPeI 137 – 150). In more relative features, the metanotal groove often retains a vestigial presence in natalensisHNS but is always absent in austraHNS, and the cross-ribs of the cinctus of the second gastral tergite are distinctly coarser and more strongly developed in natalensisHNS than in austraHNS.
A third species in this complex is meridiaHNS, which although lacking the transverse impression on the posterior surface of the petiole, often exhibits a slender transverse ridge immediately above and adjacent to the posterior peduncle. This is a smaller species, HW 0.38 – 0.42, SL 0.32 – 0.36, PeH 0.28 – 0.32, as compared to the combined measurements of HW 0.46 – 0.57, SL 0.38 – 0.50, PeH 0.34 – 0.44 in natalensisHNS and austraHNS.
In South Africa there appears to be a size-related morphoclinal reduction in several characters that spans the following species, listed in decreasing order of size: speiHNS (and boerorumHNS) – natalensisHNS – austraHNS – meridiaHNS – perparva . Along the cline there is a gradual reduction to loss of eyes, reduction to loss of metanotal groove, reduction in height of petiole and decrease in density and intensity of development of cross-ribs in the cinctus of the second tergite. If this perceived morphocline is real, then obviously the placement of speiHNS and boerorumHNS in a group separate from the others is artificial.
H. natalensisHNS was raised to species rank by Santschi (1938), without comment or clarification. Needless to say, it is not related to coarctataHNS, the species with which it was originally associated.
Material examined. South Africa: Natal, Richmond (I. Trågärdh); Kwazulu Natal, Karkloof, Leopard Bush Nat. Res. (B.L. Fisher); Kwazulu Natal, Good Hope Estate, Boston (B.L. Fisher); E. Cape Prov., Grahamstown, Fern Kloof (W. L . B r o w n ).
Found most commonly in these habitats: 2 times found in montane rainforest.
Found most commonly in these microhabitats: 2 times sifted litter (leaf mold, rotten wood).
Collected most commonly using these methods: 2 times MW 25 sample transect, 5m.
Elevations: collected at 1350 m
Type specimens: syntype of Ponera coarctata natalensis: casent0915201