Geonigidius Xin, Gong, Zhong & Qi 2025, gen. nov.
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| author | Xin, Fei-Yi Gong, Jia-Xian Zhong, Xiao-Tian Qi, Zhi-Hao |
| author_facet | Xin, Fei-Yi Gong, Jia-Xian Zhong, Xiao-Tian Qi, Zhi-Hao |
| contents | <p><b><i>Geonigidius</i> Xin, Gong, Zhong & Qi, gen. nov.</b></p><p>Chinese common name: <b>üaēạṁşȃ</b></p><p>http://zoobank.org/ urn:lsid:zoobank.org:act: D05E54F9-EFA3-49E0-9BA6-92C33280C461</p><p>(Figs. 1–10)</p><p><b>Type species.</b> <i>Geonigidius sinensis</i> Xin, Gong, Zhong & Qi, <b>sp. nov.</b>, by present designation.</p><p><b>Diagnosis.</b> The new genus can be easily identified as a member of the tribe Figulini Burmeister, 1847 (Huang & Chen 2017) by the following characters: mandibles 0.6–1.2 times as long as head; scutellum distinctly longer than wide; elytra with deep longitudinal grooves; tarsi short, and the empodium between each pair of claws lacking a rod-like structure, replaced by a single seta; dorsal surface of the median lobe of aedeagus non-expandable; median lobe of aedeagus without pedestal crossbar. The presence of a vertical dorsal appendage on the mandible indicates that it is most closely related to <i>Nigidius</i> MacLeay, 1819, <i>Novonigidius</i> Dudich, 1923, <i>Ganelius</i> Benesh, 1955 and <i>Dinonigidius</i> De Lisle, 1974 but can be easily distinguished by the following features: 1) body more robust (Figs. 1–2). 2) head broad and long, dorsal surface without a forward-pointing horn, slightly wider but slightly shorter than the pronotum (Fig. 3). 3) eyes located on both sides of the median length of the head; ocular canthus slender; the length of the postocular margin significantly longer than the preocular margin (Fig. 3). 4) dorsal appendage of the mandible distinctly asymmetrical (Fig. 4). 5) pronotum without medial groove, outer margins regularly rounded, lateral lobes almost absent (Fig. 5A); 6) the distance between the prothorax and metathorax relatively large, resulting in incomplete closure of the two segments (Figs. 1–2; 9B–C). 7) elytra extremely short and thick, length not exceeding the sum of the head and pronotum (Figs. 1–2, 5C), showing a strongly arched shape in lateral view (Fig. 6C); carina VII prominently elevated, and completely obscures the lateral margin of the elytron in dorsal view (Figs. 5C; 6D–E). 8) hindwings atrophied into a strip-like form (Fig. 6B). 9) flagellum of aedeagus very long, longer than 5 times the length of the aedeagus (Fig. 8).</p><p><b>Description.</b> <i>Habitus</i> (Figs. 1–2). Body stubby, relatively large-sized compared to other genera within the same tribe; exhibits a uniform black coloration with distinct luster, without conspicuous vestiture on surface of body.</p><p><i>Head</i> (Figs. 3–4) large. Accounting for a significant proportion of the entire body, distinctly wider but slightly shorter than the pronotum; dorsal surface with a pair of short longitudinal carinae behind the anterior margin of the head, which are distinctly elevated and directed posterolaterally; two evident point-like protrusions symmetrically present on both sides basally. Eyes small located on the outer margins of the median length of the head. Canthus thin and just completely dividing the eye. Clypeolabrum moderately long. Mandible stout, dorsal appendage of mandible bilaterally asymmetrical, with a strong upward curvature that nearly perpendicular to the head. Basal part of mandible short. Mentum transverse and bilobate. Ventral side of apical half of the scape covered with irregular and deep punctures. Antennal club with 3 antennomeres; antennomeres VIII–IX subtriangular; antennomere X semi-elliptic.</p><p><i>Pronotum</i> (Fig. 5A) transverse, slightly shorter and narrower than head; dorsal surface without a central depression.Anterior margin presents a bisinuate shape; lateral margins relatively straight and slightly serrated in the middle; posterior margin curves rounded and shows a smooth outline. Anterior angles obtuse, lateral lobes almost absent, posterior angles rounded.</p><p><i>Prosternum</i> (Fig. 5B) covered with irregular and deep punctures. A considerable distance between the prothorax and metathorax results in the incomplete closure.</p><p><i>Elytra</i> (Fig. 5C; 6C–E) short and broad. Distinctly arched in lateral view; with obvious longitudinal carinae, and dense rows of punctures varying in size.</p><p><i>Metasternum and visible abdominal ventrites</i> (Fig. 5D) with dense punctures varying in size.</p><p><i>Scutellum</i> (Fig. 5E) tiny, trapezoidal and punctate.</p><p><i>Legs</i>. Outer margin of tibiae with different-sized protuberances. Tarsi short, with a small ratio of length to tibiae, a single seta between pair of claws (Fig. 5F).</p><p><i>Hindwings</i> (Fig. 6A–B) strongly atrophied, with venation reduced and simplified.</p><p><i>Abdomen and aedeagus</i>. Abdominal tergite VIII (Fig. 7A), abdominal ventrite VIII (Fig. 7B) and abdominal segment IX (Fig. 7C–E) see the corresponding figure. Aedeagus (Fig. 8A–E) consistent with the new species description.</p><p><b>Etymology.</b> The generic name, derived from the prefix <i>geo-</i> in reference to “geophile” reflects the species’ inferred ground-dwelling habit, as evidenced by its brachypterous morphological characteristics; and the closely related genus <i>Nigidius</i>.</p><p><b>Distribution.</b> China (Xizang) (Fig. 10).</p> |
| format | Recurso digital |
| id | zenodo_https___doi_org_10_5281_zenodo_18718727 |
| institution | Zenodo |
| language | |
| publishDate | 2025 |
| publisher | Zenodo |
| record_format | zenodo |
| spellingShingle | Geonigidius Xin, Gong, Zhong & Qi 2025, gen. nov. Xin, Fei-Yi Gong, Jia-Xian Zhong, Xiao-Tian Qi, Zhi-Hao Biodiversity Taxonomy Animalia Arthropoda Insecta Coleoptera Lucanidae Geonigidius <p><b><i>Geonigidius</i> Xin, Gong, Zhong & Qi, gen. nov.</b></p><p>Chinese common name: <b>üaēạṁşȃ</b></p><p>http://zoobank.org/ urn:lsid:zoobank.org:act: D05E54F9-EFA3-49E0-9BA6-92C33280C461</p><p>(Figs. 1–10)</p><p><b>Type species.</b> <i>Geonigidius sinensis</i> Xin, Gong, Zhong & Qi, <b>sp. nov.</b>, by present designation.</p><p><b>Diagnosis.</b> The new genus can be easily identified as a member of the tribe Figulini Burmeister, 1847 (Huang & Chen 2017) by the following characters: mandibles 0.6–1.2 times as long as head; scutellum distinctly longer than wide; elytra with deep longitudinal grooves; tarsi short, and the empodium between each pair of claws lacking a rod-like structure, replaced by a single seta; dorsal surface of the median lobe of aedeagus non-expandable; median lobe of aedeagus without pedestal crossbar. The presence of a vertical dorsal appendage on the mandible indicates that it is most closely related to <i>Nigidius</i> MacLeay, 1819, <i>Novonigidius</i> Dudich, 1923, <i>Ganelius</i> Benesh, 1955 and <i>Dinonigidius</i> De Lisle, 1974 but can be easily distinguished by the following features: 1) body more robust (Figs. 1–2). 2) head broad and long, dorsal surface without a forward-pointing horn, slightly wider but slightly shorter than the pronotum (Fig. 3). 3) eyes located on both sides of the median length of the head; ocular canthus slender; the length of the postocular margin significantly longer than the preocular margin (Fig. 3). 4) dorsal appendage of the mandible distinctly asymmetrical (Fig. 4). 5) pronotum without medial groove, outer margins regularly rounded, lateral lobes almost absent (Fig. 5A); 6) the distance between the prothorax and metathorax relatively large, resulting in incomplete closure of the two segments (Figs. 1–2; 9B–C). 7) elytra extremely short and thick, length not exceeding the sum of the head and pronotum (Figs. 1–2, 5C), showing a strongly arched shape in lateral view (Fig. 6C); carina VII prominently elevated, and completely obscures the lateral margin of the elytron in dorsal view (Figs. 5C; 6D–E). 8) hindwings atrophied into a strip-like form (Fig. 6B). 9) flagellum of aedeagus very long, longer than 5 times the length of the aedeagus (Fig. 8).</p><p><b>Description.</b> <i>Habitus</i> (Figs. 1–2). Body stubby, relatively large-sized compared to other genera within the same tribe; exhibits a uniform black coloration with distinct luster, without conspicuous vestiture on surface of body.</p><p><i>Head</i> (Figs. 3–4) large. Accounting for a significant proportion of the entire body, distinctly wider but slightly shorter than the pronotum; dorsal surface with a pair of short longitudinal carinae behind the anterior margin of the head, which are distinctly elevated and directed posterolaterally; two evident point-like protrusions symmetrically present on both sides basally. Eyes small located on the outer margins of the median length of the head. Canthus thin and just completely dividing the eye. Clypeolabrum moderately long. Mandible stout, dorsal appendage of mandible bilaterally asymmetrical, with a strong upward curvature that nearly perpendicular to the head. Basal part of mandible short. Mentum transverse and bilobate. Ventral side of apical half of the scape covered with irregular and deep punctures. Antennal club with 3 antennomeres; antennomeres VIII–IX subtriangular; antennomere X semi-elliptic.</p><p><i>Pronotum</i> (Fig. 5A) transverse, slightly shorter and narrower than head; dorsal surface without a central depression.Anterior margin presents a bisinuate shape; lateral margins relatively straight and slightly serrated in the middle; posterior margin curves rounded and shows a smooth outline. Anterior angles obtuse, lateral lobes almost absent, posterior angles rounded.</p><p><i>Prosternum</i> (Fig. 5B) covered with irregular and deep punctures. A considerable distance between the prothorax and metathorax results in the incomplete closure.</p><p><i>Elytra</i> (Fig. 5C; 6C–E) short and broad. Distinctly arched in lateral view; with obvious longitudinal carinae, and dense rows of punctures varying in size.</p><p><i>Metasternum and visible abdominal ventrites</i> (Fig. 5D) with dense punctures varying in size.</p><p><i>Scutellum</i> (Fig. 5E) tiny, trapezoidal and punctate.</p><p><i>Legs</i>. Outer margin of tibiae with different-sized protuberances. Tarsi short, with a small ratio of length to tibiae, a single seta between pair of claws (Fig. 5F).</p><p><i>Hindwings</i> (Fig. 6A–B) strongly atrophied, with venation reduced and simplified.</p><p><i>Abdomen and aedeagus</i>. Abdominal tergite VIII (Fig. 7A), abdominal ventrite VIII (Fig. 7B) and abdominal segment IX (Fig. 7C–E) see the corresponding figure. Aedeagus (Fig. 8A–E) consistent with the new species description.</p><p><b>Etymology.</b> The generic name, derived from the prefix <i>geo-</i> in reference to “geophile” reflects the species’ inferred ground-dwelling habit, as evidenced by its brachypterous morphological characteristics; and the closely related genus <i>Nigidius</i>.</p><p><b>Distribution.</b> China (Xizang) (Fig. 10).</p> |
| title | Geonigidius Xin, Gong, Zhong & Qi 2025, gen. nov. |
| topic | Biodiversity Taxonomy Animalia Arthropoda Insecta Coleoptera Lucanidae Geonigidius |
| url | https://doi.org/10.5281/zenodo.18718727 |