DOI: 10.5061/dryad.m7340
title: Data from: Taxonomic revision of Stigmatomma Roger (Hymenoptera: Formicidae) in the Malagasy region

description: In this study we present the first taxonomic revision of the ant genus
 Stigmatomma in the Malagasy biogeographic region, re­describe the
 previously known S. besucheti Baroni-Urbani, and describe seven new
 species to science (S. bolabola sp. n., S. irayhady sp. n., S. janovitsika
 sp. n., S. liebe sp. n., S. roahady sp. n., S. sakalava sp. n., and S.
 tsyhady sp. n.). The revision is based on the worker caste, but we provide
 brief descriptions of gynes and males for some species. Species
 descriptions, diagnosis, character discussion, identiﬁcation key, and
 glossary are illustrated with 360 high-quality montage and SEM images. The
 distribution of Stigmatomma species in Madagascar are mapped and discussed
 within the context of the island’s biomes and ecoregions. We also discuss
 how some morphometric variables describe the diﬀerences among the species
 in the bioregion. Open science is supported by providing access to R
 scripts, raw measurement data, and all specimen data used. All specimens
 used in this study were given unique identifies, and holotypes were
 imaged. Specimens and images are made accessible on AntWeb.org.
description: R script for clustering
 specimens based on measurement dataScript for performing
 UPGMA hierarchical cluster analysis on the R platform.R script for
 clustering.pdfR script for Principal
 Component Analysis (PCA): specimens on a morphometric ordination
 spaceScript for performing
 Principal Component Analysis (PCA) on the R platform.R script for
 PCA.pdfScript for mapping the
 distribution of Stigmatomma species in Madagascar and
 SeychellesR code for making
 species distribution maps. Note: Our maps use the ecoregion outlines of
 Madagascar, which were based on the vector data disclosed by the
 Terrestrial Ecoregions of the World (available at the WWF website).
 However, the original outlines were slightly mismatching the relief of
 Madagascar. To solve this, we combined the original ecoregion data with
 data from the Remaining Primary Vegetation of Madagascar (available at the
 Kew Royal Botanic Gardens website), which has more natural
 outlines.Linear morphometry of
 Stigmatomma species in the Malagasy bioregion – raw data set of
 measurements and indicesMeasurements were taken
 on a Leica MZ APO stereomicroscope, rounded to the nearest 0.01 mm. Head
 length (HL): in fullface view, straight line from the anterior clypeal
 margin to the midpoint of a straight imaginary line connecting posterior
 corners of the head. Head width (HW): maximum width of the head, including
 eyes when present. Head width 2 (HW2): width of the head immediately
 posterior to the posterolateral margin of the clypeus. Scape length (SL):
 length of the scape (first antennal segment), excluding its basal
 constriction or neck and condyle. Mandibular length (ML): outer length of
 the mandible. Weber’s length of mesosoma (WL): diagonal length of the
 mesosoma in profile, from base of anterior slope of pronotum to
 metapleural lobe. Propodeal posterior width (PPW): width of posterior
 margin of propodeal dorsal face, in dorsal view. Petiolar length (PtL):
 maximum length of petiole in dorsal view. Petiolar width (PtW): maximum
 width of petiole in dorsal view. Cephalic index (CI): HW/HL ×100. Scape
 index (SI): SL/HL ×100. Mandibular index (MI): ML/HL ×100. Petiolar index
 (PtI): PtL/PtW ×100.