Patrus landaisi
Creators: name: Suksai, Benjamart
name: Gustafson, Grey T.
name: Sites, Robert W.
name: Sangpradub, Narumon
Publisher: name: Zenodo
Year: 2021
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Coleoptera
Gyrinidae
Patrus
Patrus landaisi

description: <i>Patrus landaisi</i> (Régimbart, 1892) (Figs. 2D, 3D, 4D, 8, 13C, 13E, 13F, 14A) <i>Orectochilus landaisi</i> Régimbart, 1892: 693 (original description) <i>Orectochilus</i> (<i>Patrus</i>) <i>landaisi</i> Régimbart, 1892: Ochs 1930: 27 <i>Patrus landaisi</i> Régimbart, 1892: Hájek &amp; Fery 2017: 29 (new combination, catalogue) <b>Type locality.</b> Cao B ằng Province, Vietnam. <b>Type material examined.</b> SYNTYPE female 'Tonkin int- / env. De Cao bang [beige label, handwritten black ink]' 'MUSEUM PARIS / COLL MAURICE REGIMBART / 1908 [beige label, typed black ink]' ' SYNTYPE [red label, typed black ink]' ' SYNTYPE / <i>Orectochilus</i> / <i>landaisi</i> Régimbart, 1892 / [white label, typed black ink]' 'MNHN / EC10156 [white label, typed black ink]; SYNTYPE female same locality except for, EC10157. <b>Other material examined.</b> <b>THAILAND: Chiang Rai Province:</b> Stream close to Ban Phithak Thai, Tap Tao Subdistrict, Thoeng District, 19°45'00.55"N 100°23'59.53"E, 1089 m a.s.l., 2.V.2019, leg. B. Suksai, P. Sapewisut &amp; N. Plangklang, 1 female (THNHM); Stream close to Ban Thai Samakkhi, Tap Tao Subdistrict, Thoeng District, 19°44'13.3"N 100°24'02.2"E, 1299 m a.s.l., 10.XI.2018, leg. B. Suksai, S. Kullasoot &amp; P. Sapewisut, 7 males (GTGC, KKU, THNHM), 7 females (KKU, THNHM); same locality except for, 2.V.2019, leg. B. Suksai, P. Sapewisut &amp; N. Plangklang, 5 males, 8 females (GTGC, THNHM, UMC); same locality except for, 19°44'35.45"N 100°24'05.91"E, 1263 m a.s.l., 28.V.2017, leg. P. Sapewisut, 9 females (KKU, THNHM). <b>Diagnosis.</b> Size: Male: 11.8–13.0 mm, female: 10.8–12.2 mm; body form in lateral view weakly dorsoventrally convex; elytral glabrous region of male (Figs. 2D, 8A) cordiform, along suture extending ca. 7/9 length of elytra, laterally expanded in anterior 2/3 to considerably wider than pronotal glabrous region, posterior 1/3 strongly acuminate with rounded margins; female elytral glabrous region (Figs. 3D, 8E) dissimilar to male, broad in anterior 2/3 occupying 10/11 elytral width, lateral margins nearly straight creating parallel-sided appearance, abruptly acuminate medially in posterior 1/3, posterolateral corners not jagged and not produced into points, posterior margin near-evenly convex toward suture; elytral apex of both sexes similar, obliquely truncate without apicolateral sinuation, epipleural angle distinct, rounded; male protibia (Fig. 4D) club-shaped, without basal constriction, protibial apex obliquely truncate with prominent distolateral angle; male protarsus (Fig. 4D) ca. 1/2 length of protibia, protarsomeres 1–4 mostly similar in width, lateral margins weakly rounded; mesoventrite without medial pit; aedeagus (Fig. 8B–D) with median lobe weakly tapered, apical 1/6 of aedeagus acuminate with nearly straight lateral margins, apex not constricted in lateral view (Fig. 8C); female reproductive tract (Fig. 8G) without additional sclerotized structure between gonocoxae (Fig. 8F), fertilization duct as in Fig. 8H. <b>Differential diagnosis.</b> <i>Patrus landaisi</i> is most similar to <i>P. garuda</i> <b>sp. nov.</b> but can be distinguished by the differential diagnoses provided above. In general, the obliquely truncate elytral apices of <i>P. landaisi</i> should readily distinguish this species. <b>Distribution.</b> This species is known from northern Vietnam (Régimbart 1892; Zaitzev 1910; Peschet 1923), southeastern China (Guizhou) (Régimbart 1907; Wu 1931; Mazzoldi 1995) and Laos (without further details) (Ochs 1930). The records from Chiang Rai Province (Fig. 14A) reported here are the first for Thailand, where it was found together with <i>P. salvazai</i> in a shallow stream (Fig. 13C) and puddles of a drying stream bed (Fig. 13E–F).
description: Published as part of <i>Suksai, Benjamart, Gustafson, Grey T., Sites, Robert W. &amp; Sangpradub, Narumon, 2021, Review of the Patrus landaisi species group from Thailand with description of three new species (Coleoptera, Gyrinidae), pp. 561-591 in Zootaxa 4991 (3)</i> on pages 575-577, DOI: 10.11646/zootaxa.4991.3.8, http://zenodo.org/record/5042656
description: {"references": ["Regimbart, M. (1892) Essai monographique de la famille des Gyrinidae. 2 e supplement. Annales de la Societe entomologique de France, 60 (1891), 663 - 752, pls. 618 - 619.", "Ochs, G. (1930) Gyrinoidea. Catalogue of Indian Insects, 19, 1 - 39.", "Hajek, J. &amp; Fery, H. (2017) Family Gyrinidae Latreille, 1810. In: Lobl, I. &amp; Lobl, D. (Eds.), Catalogue of Palaearctic Coleoptera. Vol. 1. Revised and Updated Edition. Archostemata - Myxophaga - Adephaga. Leiden, Brill, pp. 22 - 29.", "Zaitzev, F. A. (1910) Coleopteres aquatiques nouveaux ou peu connus. Revue Russe d'Entomologie, 10, 223 - 226.", "Peschet, R. (1923) Fauna entomologique de l'Indochine Gyrinidae. Opuscules de l'Institut Scientifique de l'Indochine Saigon, 6, 121 - 136.", "Regimbart, M. (1907) Essai monographique de la famille des Gyrinidae. 3 e supplement. Annales de la Societe entomologique de France, 76, 137 - 245.", "Wu, C. F. (1931) Catalogue of Chinese Gyrinidae. Peking Natural History Bulletin, 6, 63 - 73.", "Mazzoldi, P. (1995) Gyrinidae: Catalogue of Chinese Gyrinidae (Coleoptera). In: Jach, M. A. &amp; Ji, L. (Eds.), Water Beetles of China. Zoologisch-Botanische Gesellschaft in Osterreich and Wiener Coleopterologenverein, Wien, pp. 155 - 172."]}