The Ants of Egypt SUBFAMILY FORMICINAE - Genus Lepisiota (Mayr)

Genus Lepisiota (Mayr) (previously Acantholepis Mayr, 1861: 42)

In Tribe PLAGIOLEPIDINI.

Diagnostic Features - Antennae 11-segmented. Eyes well developed, ocelli present but may be reduced. Mandibles with the apical margin oblique and dentate, overhung by clypeus. Alitrunk constricted in the mesonotal region, the propodeum swollen and bidentate or bituberculate. Petiole a scale with the dorsal margin bispinose, bidentate or emarginate. Acidopore borne on a conical projection of the hypopygium, surrounded by a fringe of hairs.

Mayr's (1861: 42) genus description (as Acantholepis), is at . Santschi (1926a: 15) clarified and restated the definitions of the Genus and the subgenera Acantholepis and Lepisiota - these are at .

On the generic nomenclature, Bolton (1994) gave Acantholepis as reduced to the status of a homonym of Lepisiota but cited no authority and there are no modern revisions. This was used by all early authors and even as late as Belshaw & Bolton (1994b). As Hölldobler & Wilson (1990) gave the authorities as being Acantholepis Mayr 1861: 42 and Lepisiota Santschi 1926a: 15 (as a subgenus of Acantholepis), this was puzzling, but Bolton (1995) revealed the older name was applied to a fish genus from Denmark by Kroyer in 1846. Thus, Lepisiota, formerly a subgenus of Acantholepis, has to be used for the ants.

The evidence at present is for the existence of two species-groups - note the early authors mostly used two "species" -"capensis" and "frauenfeldi". The capensis species had a petiole which was bidentate not bispinose. True capensis (from South Africa) is black with sparse erect black hairs. Some of the confusion may stem from Forel (1892a: 43) where his key had - capensis (from South Africa, Madagascar and Indian continent) with "erect pilosity whitish, abundant on body, none on tibiae and scapes". also "petiole scale narrow with two short spines" - This clearly was erroneous in both those aspects.

Note - the diagnosis and separation of the carbonaria-group species is somewhat speculative, as the many of original descriptions are minimal separations of "subspecies". The efforts of Collingwood, later with Agosti, are admirable but the papers again give fairly minimal information and their separations also seem to owe more than a little to informed guesswork. Some species are included for comparison with those now known from Egypt, e.g L. simplex and L. incisa. The "frauenfeldi page deliberately is wide-ranging because of the poor, confused state of the knowledge.

frauenfeldi-group - elongated, shiny species; with long antennae and legs; propodeum and petiole usually with sharp prominences or spines; plus reduced or no pilosity and little pubescence "frauenfeldi" - see analysis page, an attempt to sort out a taxonomic mess and with details opaciventris described from Egypt, and, on separate pages, Lepisiota aegyptiaca new status; Lepisiota gracilicornis, Lepisiota nigra, Lepisiota splendens; and Lepisiota syriaca. The type form is not known from Egypt

carbonaria-group - stockier species, duller in appearance due to dense sculpturation; mostly TL 2.0-2.5 mm; propodeum with rounded or blunt prominences and petiole without spines; shorter antennae and legs; plus substantial coarse pilosity and dense variably coarse pubescence

Lepisiota frauenfeldi species-group

1	Slender elongated species with very long antennae, SI at least 175, and legs	2
--	Stocky and less elongated with shorter antennae, SI ca 150, and legs	4
2	SI ca 230; almost completely black, except for scapes, mandibles and lower legs	gracilicornis
--	SI < 200	3
3	TL 2.3 mm; with relatively long, narrow head (cf frauenfeldi) upper marging of petiole weakly incised (less than frauenfeldi); SI ca 175 (photographed specimens)	aegyptiaca new status
--	TL 2.5 mm; scapes long SI >190; petiole narrow, very shiny; propodeum with distinct spines; brown-black, appendages more brown	Questionable record from Egypt - splendens
4	TL 2.0-3.2 mm; petiole scale wide & acutely dentate; propodeum with short teeth about than 0.5 X basal space; clypeus with weaker median carina; less shiny but finely and distinctly reticulate; alitrunk black with no more than mesonotum red; SI ca 150 (photographed specimens & Finzi drawing)	syriaca
--	Black specimens from desert areas with workers TL 2.8-3.0 mm, possibly alternatively identifable as bipartita, which remains as a subspecies of frauenfeldi (see above). In his key, Finzi (1936: 188) noted - petiole scale large (bipartita type); maximum width at about about double the depth of the incision of the scale. Agosti & Collingwood (1987b: 279, in key) separated nigra from frauenfeldi as the former being wholly black with a smooth pronotum; whereas the latter has "part of body usually with a small patch of red, pronotum sculptured".	Questionable record from Egypt - nigra

Lepisiota carbonaria species-group

Collingwood's (1985) separation of the carbonaria-group, with some points and measurements from Collingwood & Agosti (1996), and additional material on African species gives the following (the links are to individual species pages) -

Species with the head and gaster sculptured

1	Whole dorsum with scattered erect pale hairs; HW 0.61-0.62 SI 116-118 Erect hairs sparser and shorter, gaster with spare pubescence; overall appearance duller; eyes flatter and appear dull; perhaps slightly redder in colour with more distinctively contrasting mandibles, seemingly always visible	obtusa
--	Dorsal hairs on alitrunk sparse, mainly restricted to pronotum or nil	2
2	Petiole angles produced into long spines	3
--	Petiole emarginate or dentate at most	4
3	Petiole spines longer than their intervening width; HW 0.57-0.57 SI 105-107 - for comparison	incisa
--	Petiole spines about half as long as their intervening width; HW 0.60-0.61 SI 116 Specimen from Sudan	carbonaria
--	Petiole spines about half as long as their intervening width or less, scale narrow apically in profile; with abundant variably long erect white hairs on all surfaces; distinctive downcurved hairs on clypeus - not Saudi Arabia With somewhat longer erect hairs on the pronotum, general pilosity is shaggier, with abundant pubescence on the gaster; head in full face view with a more rectangular appearance; the mandibles often concealed when closed; eyes distinctly convex and protruding; overall appearance shinier and blacker, eyes viewed from most angles seem to be black	hirsuta
4	Petiole dentate; coarse dorsal sculpture especially on pronotum not obscuring cuticular shine; one or two occasional pronotal hairs; HW 0.62 SI 112-113; Emery (1897e) erect hairs on gaster confined to apical row on each tergite; pubescence more copious than other carbonaria; almost all of body sub-opaque, metanotum and propodeum opaque Specimen from Sudan	depilis
--	Petiole rounded with very shallow emargination; propodeum with blunt projections only; whole body sculptured and dull; alitrunk entirely without dorsal hairs; HW 0.57-0.58 SI 107 Base colour dark red-brown; head in full face view heart shaped, erect hairs short and not obviously distinctive; overall appearance only weakly shiny, due to a visibly shagreened (roughened) surface	erythraea

Species with the head and gaster smooth and brilliant

1	Covered with fine, sharp, whitish hairs; TL max 2.5 mm; petiole spines weak (?) less developed than type (capensis) but clear; ? petiole with prolonged posterior pedicel. BT - head ovoid narrower anteriorly, scapes darkened apically otherwise with funiculi brownish yellow; specimen from Sudan for comparison	canescens
--	erect hairs on alitrunk solely on pronotum; for comparison	simplex

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