Bothroponera comorensis

This is one of two species with longer antennal scapes which are probably used to forage on the soil surface and in leaf litter. Colonies have been found frequently in the ground, in rotten logs, under stones, rarely in dead twigs and rotten sticks on the ground, and under layers of roots and litter on rock. Data from different collecting events over several years suggest that this large species may not have a morphologically typical queen caste as do other species within the genus, but reproduce through one or more ergatoid or gamergates in the same colony. The absence of alate queens reduces the spatial connection between geographically distant populations because dispersal must occur by budding. (Rakotonirina & Fisher, 2013)

Identification
Rakotonirina & Fisher (2013) - Larger species (HW: 2.49–3.13 mm), antennal scape extending beyond the rear cephalic border; anterior margin of clypeus truncate; eyes not breaking the outline of the sides of head; dorsum of head and mesosoma finely striate, with sparse punctures; stout erect hairs on dorsum of head and the rest of body much more inclined to the body surface.

Bothroponera comorensis can be easily confused with Bothroponera tavaratra at first glance. Yet the shape of the anterior clypeal margin, the location of the eyes, and the standing degrees of pilosity on the dorsum of the body allow the separation of these two species. Bothroponera comorensis has a truncated anterior clypeal margin, eyes that do not break the outline of the sides of the head, and subdecumbent to decumbent stout hairs on the dorsum of the body. The morphological similarity of these two species could be attributed to their adaptation to different ecological habitats in northern Madagascar. Bothroponera comorensis generally inhabits dry forest and lowland rainforest habitats, whereas B. tavaratra occupies montane rainforests.

Distribution
Bothroponera comorensis is known only from Madagascar, where it generally occupies dry and lowland humid forests and the coastal region in the north of the island. Despite its name, P. comorensis is not known from the Comoros.

Distribution based on Regional Taxon Lists
Malagasy Region: Madagascar.

Nomenclature

 *  comorensis. Ponera comorensis André, 1887: 292 (w.) MADAGASCAR. Forel, 1891b: 124 (w.). Combination in Bothroponera: Forel, 1891b: 124; in Pachycondyla (Bothroponera): Emery, 1901a: 45; in Bothroponera: Joma & Mackay, 2013: 2; Schmidt & Shattuck, 2014: 76. See also: Rakotonirina & Fisher, 2013a: 120.

Worker
Rakotonirina and Fisher (2013) - (n=10): HL: 2.94–3.49, HW: 2.49–3.13, CI: 85–92, SL: 2.47–2.95, SI: 94–99, PW: 1.95–2.30, WL: 4.13–4.98, NL: 1.34–1.62, NW: 1.45–1.67, NH: 1.64–1.94, DNI: 99–115, LNI: 110–126.

Worker. Head roughly as long as broad, broadest behind eyes on posterior third; sides very slightly convex but converging near base of mandibles; posterior margin weakly emarginate medially. Eyes moderately large, located more to the front and not breaking outline of sides of head. Antennal scape relatively long and extending beyond posterior cephalic margin. Anterior margin of clypeus truncate, not projecting into lobe, but rather straight or feebly notched medially; with head in profile, median portion perpendicular to mandibular surface. Mandibles triangular, apical margins bearing eight to nine teeth and denticles. With mesosoma in profile, outline of dorsum almost continuously convex, without distinct angle between propodeal dorsum and declivity, lateral margins of the latter also generally indiscernable. Mesopleural sulcus visible but incomplete. With petiole in dorsal view, anterior margin rounded and posterior margin straight. In profile, petiole nodiform, with rounded anterodorsal portion and distinct angle in the posterodorsal margin.

Mandibles costate or sometimes smooth with effaced fine striation, and with scattered punctures from which hairs arise. Dorsum of head densely striate and superimposed with piliferous punctures from level of eyes and frontal lobes; striation radiating towards occipital corners on each side of midline of head. Dorsal sculpture of pronotum variable, either densely finely costulate or smooth and shiny with trace of striation between sparse punctures, mesonotal and propodeal dorsum with transverse, dense, and fine striation or microreticulation which becomes fairly effaced on some specimens. Lateral portion of mesosoma characterized by a mixture of fine and dense striation and reticulate–rugulation. Declivitous surface transversely finely striate or almost smooth. Lateral portion of petiole node and first two gastral segments microreticulate to densely finely striate, with scattered large punctures which turn into a smooth and shiny surface on dorsum. Upper surface of body with suberect or appressed black, stout hairs, which are shorter on the dorsum of the head and become yellowish brown to brown on appendages; with mesosoma in frontal view, these hairs inclined towards the midline of the mesosoma dorsum, suberect along the dorsolateral margin and much more appressed near the midline. Slender brownish hairs present on ventral surface of head, gaster, and coxae. Body covered with abundant pubescence except head, dorsum of propodeum, petiole node, and third and anterior half of fourth abdominal segments. Coloration is black with reddish articulations and apices of appendages.