Aptinoma antongil Fisher

Fisher, B. L., 2009, Two new dolichoderine ant genera from Madagascar: Aptinoma gen. n. and Ravavy gen. n. (Hymenoptera: Formicidae)., Zootaxa 2118, pp. 37-52: 40

publication ID

22780

publication LSID

lsid:zoobank.org:pub:E6C087FB-8DF2-4594-AE10-39927C5ECE45

persistent identifier

http://treatment.plazi.org/id/450A86E9-C71A-4C07-99D7-AEF8E06B8803

taxon LSID

lsid:zoobank.org:act:450A86E9-C71A-4C07-99D7-AEF8E06B8803

treatment provided by

Christiana

scientific name

Aptinoma antongil Fisher
status

sp. n.

Aptinoma antongil Fisher  ZBK  HNS  sp. n.

Figures: worker 1, 2

Type material: Holotype: major worker, MADAGASCAR, Province Toamasina, Parc National de Masoala, 39.4 km 150° SSE Maroantsetra , 15.71°S, 49.97°E, 200m, 1 December 2001, under canopy moss and leaf litter, rainforest (coll. B.L.Fisher & H.J.Ratsirarson) collection code: BLF04719, pin code: CASENT0418269 ( CASC).GoogleMaps  Paratypes: 5 workers with same data as holotype but pins coded CASENT0418267, CASENT0418268, CASENT0418270 ( BMNH, CASC, MBCC, MCZC)  .

Major Worker measurements: maximum and minimum based on all specimens, n=10: HL 0.47-0.63, HW 0.48-0.63, CI 93-102, ED 0.10-0.13, SL 0.34-0.40, SI 63-73, WL 0.50-0.70, FL 0.39-0.49, PW 0.29-0.39.

Minor Worker measurements: maximum and minimum based on all specimens, n=2: HL 0.40-0.42, HW 0.39, CI 94-98, ED 0.09, SL 0.30-0.32, SI 77-80, WL 0.46, FL 0.34, PW 0.22-0.26.

With characters described in the genus diagnosis for major and minor workers: Anterior clypeal margin without a distinct shallow impression; medial clypeal margin with two or more pairs of setae directed anteriorly; additional pair of setae, slightly anterior of clypeal margin, directed anterodorsally. Scape not surpassing posterior margin of the head in full-face view in both major and minor. In dorsal view, lateral margin of pronotum evenly convex, without blunt angle at widest point. Metanotal groove in profile distinct and impressed. Dorsum of propodeum more or less convex, meeting the steeply sloped declivity in a blunt, narrowly rounded curve. In profile, propodeal spiracle along margin of declivitous face. Body light to dark brown.

Major workers are variable in size and are distinguished from the minor workers by shorter scapes relative to head width (SI 63-73). Since only two minor workers were collected, further samples are needed to evaluate if there is a continuum of worker sizes from minors to the larger majors.

A. antongil  ZBK  HNS  can be separated from A. mangabe  ZBK  HNS  by color and shape of propodeum and metanotal groove as outlined in the key to species. Minor workers of A. antongil  ZBK  HNS  are easily distinguished from minor workers of A. mangabe  ZBK  HNS  by length of scape. The scape surpasses the posterior margin of the head in minor workers in A. mangabe  ZBK  HNS  while in A. antongil  ZBK  HNS  it does not reach the margin.

QUEEN and MALE: unknown.

Distribution and biology. The distribution is limited to forests around Antongil Bay, Madagascar. Specimens have been collected from canopy habitat on the Masoala Peninsula and on low vegetation near the summit of Montagne d'Anjanaharibe (1100 m) just north of Maroansetra. Like A. mangabe  ZBK  HNS  , this species is arboreal. However, it may not nest in dead twigs as does A. mangabe  ZBK  HNS  . Collections suggest that the species nests under canopy litter and moss. The collections in Masoala were made by exploring the canopy using ropes. A. antongil  ZBK  HNS  workers were found foraging under moss and litter at the junction of branches.

Additional material examined for Aptinoma antongil  ZBK  HNS  : In addition to the type material, specimens from five additional collecting events from the following two localities were examined in this study. MADAGASCAR, Province Toamasina: Parc National de Masoala, 39.4 km 150° SSE Maroantsetra, 200 m, 15.71°S, 49.97°E, (B.L.Fisher & H.J.Ratsirarson), 1 December 2001, rainforest, canopy moss and leaf litter collection codes: BLF04716, BLF04717, BLF04718 BLF04721. Montagne d'Anjanaharibe, 19.5 km 27° NNE Ambinanitelo, 1100 m, 15.17833°S, 49.635°E, (Fisher et al), 14 March 2003, montane rainforest, beating low vegetation, collection code: BLF08151.

CASC

USA, California, San Francisco, California Academy of Sciences

BMNH

United Kingdom, London, The Natural History Museum [formerly British Museum (Natural History)]

MCZC

USA, Massachusetts, Cambridge, Harvard University, Museum of Comparative Zoology