Strumigenys rimdahli Hamer, Katzke, Tang, Weemaels, Hita-Garcia, Economo & Guénard, 2025, sp. nov.
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| author | Hamer, Matthew T. Katzke, Julian Tang, Kit Lam Weemaels, André Ibáñez Hita-Garcia, Francisco Economo, Evan P. Guénard, Benoit |
| author_facet | Hamer, Matthew T. Katzke, Julian Tang, Kit Lam Weemaels, André Ibáñez Hita-Garcia, Francisco Economo, Evan P. Guénard, Benoit |
| contents | <p><b><i>Strumigenys rimdahli sp. nov.</i> (Hamer, Tang & Guénard, 2025)</b></p><p>urn:lsid:zoobank.org:act:619FD6BE-56A9-48C7-8622-DF68FA7D6D72 Fig 8A–F.</p><p><b>Diagnosis</b></p><p>In full face-view, head longer than broad, broadest on posterior third. Scape lacking standing setae. Cephalic dorsum with sparse standing setae; in full-face view, dorsolateral margin with single pair of projecting setae that extend beyond dorsolateral margin. Dorsolateral margin of mesosoma distinctly marginated; in lateral view, mesosomal dorsum flat.</p><p>Anterolateral margin of pronotum angulated in dorsal view. Anterior margin of postpetiolar disc conspicuously straight anteriorly. Basigastral costulae present. Dorsal surface of meso- and metabasitarsus with single, long erect seta. Meso- and metatibia with single erect seta noticeably shorter than erect seta on basitarsus. Legs with numerous appressed, decumbent and semierect setae on all segments.</p><p><b>Material examined</b></p><p>1 <b>Holotype</b> worker: TH; Chiang Mai; N19.236638 E98.650739;±20m²; 1106 masl; 10.viii.2024; LLex.4m2; MTHamer et al; old sec. for. CM-P17-01. ANTWEB1010648 [ZRC].</p><p><b>Cybertypes</b></p><p>Holotype (ANTWEB1010648) dataset consists of surface volume rendering image stacks of PNG files comprising full-face views stills of the head, whole body in lateral and dorsal view, as well as mandibles in anterior view. Further, raw volumetric data (nii format), and a full 3D surface model (STL format) are made available. Digital stacked colour images of the whole body in lateral and dorsal view, as well as the head in full-face view are also provided (TIFF format). All data is deposited on Zenodo (https://zenodo.org/records/14830376). A 3D surface model is also made available on Sketchfab (https://skfb.ly/pyFxM).</p><p><b>Description</b></p><p>Holotype measurements: HW 0.32; HL 0.37; ML 0.06; SL 0.16; WL 0.37; PW 0.18; PL 0.17; PH 0.10; DPW 0.09; DPL 0.09; DPPW 0.13; DPPL 0.09; ATL 0.30; TL 1.36.</p><p>Indices; CI 84.68; MI 16.67; SI 50.16; PI 57.46; LPI 58.43; DPI 56.02; DPPI 142.20.</p><p><b>Head</b></p><p>In full face-view, head longer than broad, broadest on posterior third. Posterior margin broadly concave, with region of transparent cuticle. Lateral clypeal margins converging anteriorly; anterior margin subtly convex. Epistomal sulcus absent, cephalic dorsum and clypeus continuous; torular lobe small, convex and obscuring antennal foramen in full-face view. Antennae totalling six segments; scape short, failing to reach posterior margin; scape dorsoventrally flattened, converging anteriorly to form flange at leading edge, narrowing, basally and distally. Flagellomeres terminating in two-segment club; apicalmost segment longer than penultimate segment. Mandible triangular, reducing in width apically; basal masticatory margin with one short triangular basal tooth and four long, triangular teeth, apical half with two triangular teeth of equal length to previous four teeth, followed by four small teeth and an apical tooth the same size as previous two teeth. In lateral view, preocular carina short, terminating long before eye level. Glandular groove not well impressed, terminating well before eye. Eye minute, comprised of single ommatidium. Postbuccal impression conspicuous; ventral head margin, from preocular notch to occipital foramen sinuate, being convex before eye and concave anterior to occipital foramen. In lateral view, angle of intercept between ventrolateral head margin and posterior head margin slightly obtuse, with a minute posterior projecting cuticular lobe at intercept.</p><p><b>Mesosoma</b></p><p>In dorsal view, mesosoma lacking promesonotal suture, metanotal groove absent. In lateral view, promesonotal suture weakly impressed, not reaching dorsolateral margin. Mesosomal outline weakly convex anteriorly to strongly convex posteriorly due to propodeal declivity. Dorsolateral margin distinctly marginated. In lateral view, mesosomal dorsum flat. Mesopleural notch present and well impressed; seta wheel present. Katepistermum with a long, sharp, anteriorly directed cuticular spur almost reaching posteroventral corner of pronotal side. In dorsal view, pronotum reaching maximum width at mid-length; angulated anteriorly with anterolateral angle obtuse. Propodeum unarmed; propodeum with semi-rectangular, dorsally rounded spongiform tissue only. Propodeal declivity slightly concave in dorsal view.</p><p><b>Metasoma</b></p><p>In lateral view, petiolar peduncle and anterior petiolar face meeting at obtuse angle; anterior face of petiole flat, grading into dorsal face with blunt angle. Dorsal margin of petiolar and postpetiolar surfaces convex. In dorsal view, petiolar disc oval, wider than long; postpetiolar disc wider than long, anterior margin straight, with weakly posteriorly converging lateral margins, posterior margin feebly concave. Ventral petiolar spongiform tissue present; lateral petiole spongiform tissue small. Conspicuous ventral and lateral spongiform tissue on postpetiole, obscuring lateral postpetiolar surface. Spongiform tissue surrounding postpetiolar disc both anteriorly and laterally in dorsal view, but not on top of postpetiole disc itself.</p><p><b>Pilosity</b></p><p>In lateral view, cephalic dorsum with two pairs of standing setae. In full-face view, dorsolateral margin with single standing seta; cephalic dorsum with short and appressed setae, concentrated posteriorly on cephalic dorsum, directed inwards to cephalic mid-line. Clypeal dorsum lacking standing setae, setae instead simple, appressed setae present, directed anteriorly. Setae on both cephalic and clypeal dorsa well-spaced. Ventral cephalic setae mix of short, appressed setae alongside long, appressed simple setae. Postbuccal cavity with conspicuous series of long and erect simple setae noticeably longer than surrounding setae on cephalic dorsum. Scape lacking standing setae, appressed and decumbent, simple setae present only. Flagellomere segments with short, appressed simple setae, reaching highest concentration on apical segment. Pronotal humeral seta present, simple and apically blunt, directed antero-laterally and well differentiated from surrounding appressed mesosomal setae. Dorsal mesosomal setae appressed and simple, directed inwards to mesosomal longitudinal midline. Hair wheel with four to five, appressed simple setae. Petiole and postpetiole disc with sparse, simple erect setae; single pair of setae located on posterior margin of postpetiole dorsum directed posterodorsally. Gastral tergites with long, stout erect setae and short appressed setae. Gastral sternites in lateral view, with long, erect simple setae, noticeably shorter and less stout than those on tergites. Gastral sternites also with long, decumbent to semi-erect simple setae. Meso- and metabasitarsus with single, long projecting seta. Meso- and metatibia with single erect seta noticeably shorter than the projecting seta on basitarsus. Legs also covered in numerous appressed, decumbent and semierect setae on all segments.</p><p><b>Colour</b></p><p>Body colour reddish brown, appendages light reddish brown, spongiform tissue whitish yellow.</p><p><b>Sculpture</b></p><p>Almost entire body integument lacking sculpture, only sculpture located on first gastral tergite in form of basigastral costulae, and micro-punctures on all antennal segments, coxae and basitarsi.</p><p><b>Etymology</b></p><p>Named after Mr. Kenneth Rimdahl, founder of Monsoon Tea, in recognition of his conservation efforts and help in facilitating fieldwork in Thailand.</p><p><b>Distribution</b></p><p>Only known from Chiang Mai, Thailand (Fig 1; Table 1).</p><p><b>Comments</b></p><p><i>Strumigenys rimdahli</i> is a member of the <i>mnemosyne</i> group, displaying the necessary morphological characters to be placed into the group. Within the group, <i>S. rimdahli</i> is most similar to S. <i>mnemosyne</i> and <i>S. marmorata</i> but can be easily differentiated from both by the conspicuous marginated dorsolateral mesosomal margin, and the flat mesosomal dorsum. Further characters that differentiate <i>S</i>. <i>rimdahli</i> from S. <i>mnemosyne</i> include the single, stout seta extending beyond lateral cephalic margin (four setae in S. <i>mnemosyne</i>), alongside the reduced length and abundance of standing setae across the whole body most especially the legs and mesosoma dorsum (including the pronotal humeral setae). In <i>S. rimdahli</i> the anterior corners of the pronotal dorsal margin are angulated whereas in <i>S</i>. <i>mnemosyne</i> they are more rounded. Morphological characters that differentiate <i>S. rimdahli</i> from <i>S. marmorata</i> include the presence of long, freely projecting setae on the outer surfaces of the meso- and meta- tibae and basitarsi (absent in <i>S. marmorata</i>), the greater number of standing setae on the head dorsum and legs, and a straight anterior petiole margin in dorsal view (concave in <i>S. marmorata</i>).</p><p><b>Ecology</b></p><p>The holotype specimen was collected in an old secondary forest in Mae Sae, Chiang Mai Province at 1106 m a.s.l within a 4 m² leaf litter sample extracted within a Winkler over 72 hours. Nothing else is known about the biology of <i>S. rimdahli</i>.</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_18485309 |
| institution | Zenodo |
| language | |
| publishDate | 2025 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Strumigenys rimdahli Hamer, Katzke, Tang, Weemaels, Hita-Garcia, Economo & Guénard, 2025, sp. nov. Hamer, Matthew T. Katzke, Julian Tang, Kit Lam Weemaels, André Ibáñez Hita-Garcia, Francisco Economo, Evan P. Guénard, Benoit Biodiversity Taxonomy Animalia Arthropoda Insecta Hymenoptera Formicidae Strumigenys Strumigenys rimdahli <p><b><i>Strumigenys rimdahli sp. nov.</i> (Hamer, Tang & Guénard, 2025)</b></p><p>urn:lsid:zoobank.org:act:619FD6BE-56A9-48C7-8622-DF68FA7D6D72 Fig 8A–F.</p><p><b>Diagnosis</b></p><p>In full face-view, head longer than broad, broadest on posterior third. Scape lacking standing setae. Cephalic dorsum with sparse standing setae; in full-face view, dorsolateral margin with single pair of projecting setae that extend beyond dorsolateral margin. Dorsolateral margin of mesosoma distinctly marginated; in lateral view, mesosomal dorsum flat.</p><p>Anterolateral margin of pronotum angulated in dorsal view. Anterior margin of postpetiolar disc conspicuously straight anteriorly. Basigastral costulae present. Dorsal surface of meso- and metabasitarsus with single, long erect seta. Meso- and metatibia with single erect seta noticeably shorter than erect seta on basitarsus. Legs with numerous appressed, decumbent and semierect setae on all segments.</p><p><b>Material examined</b></p><p>1 <b>Holotype</b> worker: TH; Chiang Mai; N19.236638 E98.650739;±20m²; 1106 masl; 10.viii.2024; LLex.4m2; MTHamer et al; old sec. for. CM-P17-01. ANTWEB1010648 [ZRC].</p><p><b>Cybertypes</b></p><p>Holotype (ANTWEB1010648) dataset consists of surface volume rendering image stacks of PNG files comprising full-face views stills of the head, whole body in lateral and dorsal view, as well as mandibles in anterior view. Further, raw volumetric data (nii format), and a full 3D surface model (STL format) are made available. Digital stacked colour images of the whole body in lateral and dorsal view, as well as the head in full-face view are also provided (TIFF format). All data is deposited on Zenodo (https://zenodo.org/records/14830376). A 3D surface model is also made available on Sketchfab (https://skfb.ly/pyFxM).</p><p><b>Description</b></p><p>Holotype measurements: HW 0.32; HL 0.37; ML 0.06; SL 0.16; WL 0.37; PW 0.18; PL 0.17; PH 0.10; DPW 0.09; DPL 0.09; DPPW 0.13; DPPL 0.09; ATL 0.30; TL 1.36.</p><p>Indices; CI 84.68; MI 16.67; SI 50.16; PI 57.46; LPI 58.43; DPI 56.02; DPPI 142.20.</p><p><b>Head</b></p><p>In full face-view, head longer than broad, broadest on posterior third. Posterior margin broadly concave, with region of transparent cuticle. Lateral clypeal margins converging anteriorly; anterior margin subtly convex. Epistomal sulcus absent, cephalic dorsum and clypeus continuous; torular lobe small, convex and obscuring antennal foramen in full-face view. Antennae totalling six segments; scape short, failing to reach posterior margin; scape dorsoventrally flattened, converging anteriorly to form flange at leading edge, narrowing, basally and distally. Flagellomeres terminating in two-segment club; apicalmost segment longer than penultimate segment. Mandible triangular, reducing in width apically; basal masticatory margin with one short triangular basal tooth and four long, triangular teeth, apical half with two triangular teeth of equal length to previous four teeth, followed by four small teeth and an apical tooth the same size as previous two teeth. In lateral view, preocular carina short, terminating long before eye level. Glandular groove not well impressed, terminating well before eye. Eye minute, comprised of single ommatidium. Postbuccal impression conspicuous; ventral head margin, from preocular notch to occipital foramen sinuate, being convex before eye and concave anterior to occipital foramen. In lateral view, angle of intercept between ventrolateral head margin and posterior head margin slightly obtuse, with a minute posterior projecting cuticular lobe at intercept.</p><p><b>Mesosoma</b></p><p>In dorsal view, mesosoma lacking promesonotal suture, metanotal groove absent. In lateral view, promesonotal suture weakly impressed, not reaching dorsolateral margin. Mesosomal outline weakly convex anteriorly to strongly convex posteriorly due to propodeal declivity. Dorsolateral margin distinctly marginated. In lateral view, mesosomal dorsum flat. Mesopleural notch present and well impressed; seta wheel present. Katepistermum with a long, sharp, anteriorly directed cuticular spur almost reaching posteroventral corner of pronotal side. In dorsal view, pronotum reaching maximum width at mid-length; angulated anteriorly with anterolateral angle obtuse. Propodeum unarmed; propodeum with semi-rectangular, dorsally rounded spongiform tissue only. Propodeal declivity slightly concave in dorsal view.</p><p><b>Metasoma</b></p><p>In lateral view, petiolar peduncle and anterior petiolar face meeting at obtuse angle; anterior face of petiole flat, grading into dorsal face with blunt angle. Dorsal margin of petiolar and postpetiolar surfaces convex. In dorsal view, petiolar disc oval, wider than long; postpetiolar disc wider than long, anterior margin straight, with weakly posteriorly converging lateral margins, posterior margin feebly concave. Ventral petiolar spongiform tissue present; lateral petiole spongiform tissue small. Conspicuous ventral and lateral spongiform tissue on postpetiole, obscuring lateral postpetiolar surface. Spongiform tissue surrounding postpetiolar disc both anteriorly and laterally in dorsal view, but not on top of postpetiole disc itself.</p><p><b>Pilosity</b></p><p>In lateral view, cephalic dorsum with two pairs of standing setae. In full-face view, dorsolateral margin with single standing seta; cephalic dorsum with short and appressed setae, concentrated posteriorly on cephalic dorsum, directed inwards to cephalic mid-line. Clypeal dorsum lacking standing setae, setae instead simple, appressed setae present, directed anteriorly. Setae on both cephalic and clypeal dorsa well-spaced. Ventral cephalic setae mix of short, appressed setae alongside long, appressed simple setae. Postbuccal cavity with conspicuous series of long and erect simple setae noticeably longer than surrounding setae on cephalic dorsum. Scape lacking standing setae, appressed and decumbent, simple setae present only. Flagellomere segments with short, appressed simple setae, reaching highest concentration on apical segment. Pronotal humeral seta present, simple and apically blunt, directed antero-laterally and well differentiated from surrounding appressed mesosomal setae. Dorsal mesosomal setae appressed and simple, directed inwards to mesosomal longitudinal midline. Hair wheel with four to five, appressed simple setae. Petiole and postpetiole disc with sparse, simple erect setae; single pair of setae located on posterior margin of postpetiole dorsum directed posterodorsally. Gastral tergites with long, stout erect setae and short appressed setae. Gastral sternites in lateral view, with long, erect simple setae, noticeably shorter and less stout than those on tergites. Gastral sternites also with long, decumbent to semi-erect simple setae. Meso- and metabasitarsus with single, long projecting seta. Meso- and metatibia with single erect seta noticeably shorter than the projecting seta on basitarsus. Legs also covered in numerous appressed, decumbent and semierect setae on all segments.</p><p><b>Colour</b></p><p>Body colour reddish brown, appendages light reddish brown, spongiform tissue whitish yellow.</p><p><b>Sculpture</b></p><p>Almost entire body integument lacking sculpture, only sculpture located on first gastral tergite in form of basigastral costulae, and micro-punctures on all antennal segments, coxae and basitarsi.</p><p><b>Etymology</b></p><p>Named after Mr. Kenneth Rimdahl, founder of Monsoon Tea, in recognition of his conservation efforts and help in facilitating fieldwork in Thailand.</p><p><b>Distribution</b></p><p>Only known from Chiang Mai, Thailand (Fig 1; Table 1).</p><p><b>Comments</b></p><p><i>Strumigenys rimdahli</i> is a member of the <i>mnemosyne</i> group, displaying the necessary morphological characters to be placed into the group. Within the group, <i>S. rimdahli</i> is most similar to S. <i>mnemosyne</i> and <i>S. marmorata</i> but can be easily differentiated from both by the conspicuous marginated dorsolateral mesosomal margin, and the flat mesosomal dorsum. Further characters that differentiate <i>S</i>. <i>rimdahli</i> from S. <i>mnemosyne</i> include the single, stout seta extending beyond lateral cephalic margin (four setae in S. <i>mnemosyne</i>), alongside the reduced length and abundance of standing setae across the whole body most especially the legs and mesosoma dorsum (including the pronotal humeral setae). In <i>S. rimdahli</i> the anterior corners of the pronotal dorsal margin are angulated whereas in <i>S</i>. <i>mnemosyne</i> they are more rounded. Morphological characters that differentiate <i>S. rimdahli</i> from <i>S. marmorata</i> include the presence of long, freely projecting setae on the outer surfaces of the meso- and meta- tibae and basitarsi (absent in <i>S. marmorata</i>), the greater number of standing setae on the head dorsum and legs, and a straight anterior petiole margin in dorsal view (concave in <i>S. marmorata</i>).</p><p><b>Ecology</b></p><p>The holotype specimen was collected in an old secondary forest in Mae Sae, Chiang Mai Province at 1106 m a.s.l within a 4 m² leaf litter sample extracted within a Winkler over 72 hours. Nothing else is known about the biology of <i>S. rimdahli</i>.</p> |
| title | Strumigenys rimdahli Hamer, Katzke, Tang, Weemaels, Hita-Garcia, Economo & Guénard, 2025, sp. nov. |
| topic | Biodiversity Taxonomy Animalia Arthropoda Insecta Hymenoptera Formicidae Strumigenys Strumigenys rimdahli |
| url | https://doi.org/10.5281/zenodo.18485309 |