Patrus phetchabunensis, Suksai & Gustafson & Sites & Sangpradub, 2021

Suksai, Benjamart, Gustafson, Grey T., Sites, Robert W. & Sangpradub, Narumon, 2021, Review of the Patrus landaisi species group from Thailand with description of three new species (Coleoptera, Gyrinidae), Zootaxa 4991 (3), pp. 561-591 : 579-582

publication ID

https://doi.org/10.11646/zootaxa.4991.3.8

publication LSID

lsid:zoobank.org:pub:F0FAE07E-4A90-4602-BCC5-6D80E158BB6C

DOI

https://doi.org/10.5281/zenodo.5042676

persistent identifier

https://treatment.plazi.org/id/03BC87C1-FFF8-225E-0CC0-7F4EFBAE50B4

treatment provided by

Plazi

scientific name

Patrus phetchabunensis
status

sp. nov.

Patrus phetchabunensis sp. nov.

( Figs. 2F View FIGURE 2 , 3F View FIGURE 3 , 4F View FIGURE 4 , 10 View FIGURE 10 , 13D View FIGURE 13 , 14B View FIGURE 14 )

Type material. HOLOTYPE: male (card mounted; aedeagus in microvial), “ THAILAND: Phitsanulok / Province Phu Hin / Rhongkla National Park / Huai Khamuen Noi Waterfall : 10.IV.2003 // 16°59’N 101°60’E / 1220 m a.s.l. / coll: CMU team” ( UMC). GoogleMaps

PARATYPES (163 exs): THAILAND: Loei Province: Phu Kradueng Natl. Park, Phra Ong Waterfall, Si Than Subdistrict , Phu Kradueng District , 16°52’08.2”N 101°46’31.3”E, 23.V.1996, leg. N. Sangpradub, 1 male ( KKU) GoogleMaps ; same locality except for, Tarn Sawan Waterfall, Si Than Subdistrict, Phu Kradueng District , 16°52’55.3”N 101°46’44.6”E, 1173 m a.s.l., 7.III.2011, leg. N. Sangpradub, 1 male ( THNHM) GoogleMaps ; same locality except for, Tham Yai Waterfall, Si Than Subdistrict, Phu Kradueng District , 16°52’59.9”N 101°46’46.4”E, 1197 m a.s.l., 21.V.1995, leg. N. Sangpradub, 1 male ( KKU) GoogleMaps ; same locality except for, 23.X.1995, leg. N. Sangpradub, 2 females ( KKU, THNHM) GoogleMaps , 1 male ( THNHM) GoogleMaps . Phitsanulok Province: Phu Hin Rongkla Natl. Park., Huai Khamuen Noi Waterfall , 16°59’N 101°00’E, 1220 m, 17.I.2003, leg. CMU team, 1 female ( UMC) GoogleMaps ; same locality except for, 10.II.2003, leg. CMU team, 1 female ( UMC) GoogleMaps ; same locality except for, 17.III.2003, leg. CMU team, 1 male, 1 female ( UMC) GoogleMaps ; same locality except for, 10.IV.2003, leg. CMU team, 2 males ( UMC) GoogleMaps , 7 females ( KKU, THNHM, UMC) GoogleMaps ; same locality except for, 5.V.2003, leg. N. Changthong, 5 males, 3 females ( UMC) GoogleMaps ; same locality except for, 5.VI.2003, leg. N. Changthong, 1 male ( KKU) GoogleMaps ; same locality except for, stream btw Rd 2113, Man Daeng Waterfall , 12.VI.1998, leg. R.W. Sites & K.B. Simpson, L-186, 2 males, 9 females ( UMC) GoogleMaps ; same locality except for, 1 male ( THNHM) GoogleMaps ; same locality except for, L-187, 8 males ( KKU, THNHM, UMC) GoogleMaps , 8 females ( KKU) GoogleMaps ; same locality except for, Man Daeng Noi at trail, 16º57’N 101°03’E, 1600 m a.s.l., 10.IV.2003, leg. CMU team, 5 males, 8 females ( UMC, THNHM) GoogleMaps ; same locality except for, 5.V.2003, leg. N. Changthong, 5 males, 9 females ( UMC) GoogleMaps ; same locality except for, 12.VII.2003, leg. N. Changthong, 1 male, 1 female ( UMC) GoogleMaps ; same locality except for, 20.VII.2002, leg. CMU team, 2 females ( UMC) GoogleMaps ; same locality except for, Romglao Waterfall , 16°59’N 101°00’E, 1190 m a.s.l., 22.V.2002, leg. CMU team, 1 female ( UMC) GoogleMaps ; same locality except for, 17.III.2003, leg. CMU team, 1 female ( UMC) GoogleMaps ; same locality except for, 10.IV.2003, leg. CMU team, 2 males ( UMC) GoogleMaps , 6 females ( UMC, THNHM) GoogleMaps ; same locality except for, 5.VI.2003, leg. N. Changthong, 6 males, 10 females ( UMC) GoogleMaps ; Waterwheel Falls , 16°59’N 101°00’E, 1280 m a.s.l., 22.IV.2002, leg. CMU team, 1 female ( UMC) GoogleMaps ; same locality except for, 20.VII.2002, leg. CMU team, 2 females ( UMC) GoogleMaps ; same locality except for, 10.II.2003, leg. CMU team, 4 males, 5 females ( UMC) GoogleMaps ; same locality except for, 5.V.2003, leg. N. Changthong, 8 males, 15 females ( UMC) GoogleMaps ; same locality except for, 12.VII.2003, leg. N. Changthong, 4 males, 2 females ( UMC) GoogleMaps .

Additional material. THAILAND: Loei Province: Phu Kradueng Natl. Park, stream near Tham Sor Noe Waterfall , 1200–1250 m a.s.l., 28.XII.1999 (16), leg. P. Mazzoldi, 7 exs ( PMI) ; same locality except for, stream betw. Ano Dat Pond and Tham Sor Noe Waterfall , 28.XII.1999 (15), leg. P. Mazzoldi, 112 exs ( PMI) ; same locality except for, 16°52’N 101°49’E, 16–18.V.1999, leg. D. Hauck, 1000 m a.s.l., 4 exs ( PMI) GoogleMaps ; same locality except for, Phu Rua Natl. Park , 17°30’N 101°21’E., 1100 m a.s.l., 6, 9.V.1999, leg. D. Hauck, 4 exs ( PMI) GoogleMaps ; same locality except for, upstream from Huai Phai Waterfall , 26.XII.1999 (8), 1000 m a.s.l., leg. P. Mazzoldi, 2 exs ( PMI) GoogleMaps ; same locality except for, 26.XII.1999 (9), 1200 m a.s.l., leg. P. Mazzoldi, 76 exs ( PMI) GoogleMaps . Nan Province: Doi Phu Ka Natl. Park, Ton Tong Waterfall , stream in evergreen forest, 1000–1100 m a.s.l. (28), 3.I.1999, leg. P. Mazzoldi, 6 exs ( PMI) ; same locality except for, road to Ton Tong Waterfall , small stream, 1240 m a.s.l. (27), 3.I.1999, leg. P. Mazzoldi, 6 exs ( PMI) . Phitsanulok Province: Phu Hin Rongkla Natl. Park. , 27.III.1994, leg. W. Shepard // WDS A 1047, 23 exs (19 NHMW; 4 PMI) ; same locality except for, stream near Huai Khamuen Noi Waterfall , 1200 m a.s.l., 25.XII.1999 (6), leg. P. Mazzoldi, 19 exs ( PMI) .

Diagnosis. Body form in lateral view weakly dorsoventrally convex; elytral glabrous region of male ( Figs. 2F View FIGURE 2 , 10A View FIGURE 10 ) 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 weakly rounded margins; female elytral glabrous region similar to male ( Figs. 3F View FIGURE 3 , 10E View FIGURE 10 ), except with weaker apical acumination; elytral apex of both sexes similar, obliquely truncate without apicolateral sinuation, epipleural angle distinct, weakly rounded; male protibia ( Fig. 4F View FIGURE 4 ) cleaver shaped, constricted in basal 2/5, protibial apex truncate with prominent distolateral angle; male protarsus ( Fig. 4F View FIGURE 4 ) ca. 1/2 length of protibia, protarsomeres width gradually decreasing apically; mesoventrite without medial pit; aedeagus ( Fig. 10B View FIGURE 10 ) with median lobe evenly tapered, apex constricted in lateral view ( Fig. 10C View FIGURE 10 ); female reproductive tract ( Fig. 10G View FIGURE 10 ) without additional sclerite between gonocoxae ( Fig. 10F View FIGURE 10 ), fertilization duct as in Fig. 10H View FIGURE 10 .

Description. Habitus. Size. Male: TL = 10.0–12.0 mm, TW = 6.0–7.0 mm; female: TL = 9.5–11.0 mm, TW = 5.0– 6.5 mm.

Body form elongate oval, evenly attenuated anteriorly and posteriorly, maximum width just posterior of humeral angle; in lateral view dorsoventrally weakly convex, maximum convexity posterior to scutellar region, evenly depressed anteriorly and posteriorly.

Coloration ( Figs. 2F View FIGURE 2 , 3F View FIGURE 3 ). Dorsally head, pronotum, and elytra margined with golden pubescence; glabrous regions of head pronotum and elytra black with reticulation creating brassy sheen. Pronotal and elytral lateral margins dark. Venter dark, reddish-brown to black. Middle and hind legs from trochanter to tarsus and ultimate abdominal ventrite lighter in color, red to orangish-red.

Head. Head capsule broad, convex. Labrum short, ca. 3.5× wider than long; setose medially with setae situated in large deep punctures; apex broadly rounded. Clypeus narrow, ca. 1/2 width of labrum; strongly reticulate and densely punctured, reticulation hatched in appearance with numerous short, well-impressed transverse lines. Frons similarly with strong hatched reticulation and dense punctation; pseudofrontal ridge present; furrow beneath pseudofrontal ridge without setae. Vertex also with strongly impressed hatch reticulation and dense punctation between dorsal eyes, reticulation becoming effaced in narrow band on occipital region. Dorsal eye delimited by strong orbital furrow; distance between dorsal eyes ca. 2.5× diameter of an eye; interorbital area strongly setose.

Thorax. Pronotum ( Figs. 2F View FIGURE 2 , 10A View FIGURE 10 ) with narrow lateral margins; pronotal transverse impressed line absent; lateral pubescence anteriorly extending onto pronotal disc as far as middle of dorsal eye; pronotal glabrous region densely and uniformly punctate with small weakly impressed punctures, strongly reticulate with uniform well-impressed hatched reticulation similar to frons and vertex. Scutellar shield visible. Protrochanter with setose line along ventral (anterior) face. Profemur with setigerous punctures along anterior margin of ventral face, posterior margin of ventral face with row of setae along basal 2/3 ending with patch of longer denser setae. Protibia ( Fig. 4F View FIGURE 4 ) cleaver shaped in males, constricted in basal 2/5 creating weakly sinuate ventral (inner) margin; distal apex truncate, distolateral angle prominent. Male protarsus ( Fig. 4F View FIGURE 4 ) ca. 1/2 length of protibia, protarsomeres with distolateral angle round, not overlapping following tarsomere, lateral margins weakly rounded, fifth tarsomere 1.5× length of fourth, with lateral margins weakly rounded. Elytra ( Figs. 2F View FIGURE 2 , 10A View FIGURE 10 ) with narrow lateral margins gradually widened apically; glabrous region cordiform, along suture extending ca. 7/9 length of elytra, laterally expanded in anterior 2/3 to just wider than pronotal glabrous region, posterior 1/3 weakly attenuated with weakly rounded margins; reticulation and punctation similar to pronotal glabrous region; elytral apex obliquely truncate, without apicolateral sinuation, epipleural angle distinct, weakly rounded, sutural angle straight forming near 90° angle. Mesoventrite without medial pit.

Sexual dimorphism. Female smaller in size, less laterally expanded near elytral mid-length resulting in narrow maximum width. Glabrous cordiform region of elytra less acuminate posteriorly ( Figs. 3F View FIGURE 3 , 10E View FIGURE 10 ) due to weaker convexity of lateral pubescence of elytra in apical 1/3. Forelegs smaller, female protibia narrower with less pronounced constriction in basal 2/5 and weaker sinuation of the ventral margin.

Male genitalia. Aedeagus ( Fig. 10B View FIGURE 10 ) with median lobe ca. 4/5 length of parameres, evenly tapered, apex in lateral view noticeably constricted ( Fig. 10C View FIGURE 10 ), operculum as in Fig. 10D View FIGURE 10 ; parameres narrowly rounded apically ( Fig. 10B View FIGURE 10 ).

Female genitalia. Reproductive tract with large sac-like spermatheca ( Fig. 10G View FIGURE 10 ); fertilization duct sclerotized, highly convoluted ( Fig. 10H View FIGURE 10 ); small sclerite present posterior to oviduct; additional round sclerite between gonocoxae absent; gonocoxae narrow, apically broadly rounded, laterally with nearly straight margins ( Fig. 10F View FIGURE 10 ).

Variation. There is considerable variation in size among the specimens examined. There is also noticeable variation in maximum width particularly in males, with larger males being wider than other males with smaller body lengths.

Differential diagnosis. Patrus phetchabunensis sp. nov. is most similar to P. salvazai . Males of these two species share a cleaver-shaped protibia which differentiates them from the other P. landaisi species group members in Thailand. Patrus phetchabuensis sp. nov. can be distinguished from P. salvazai by having the protibial constriction limited to the basal 2/5 ( Fig. 4F View FIGURE 4 ), whereas in P. salvazai ( Fig. 4G View FIGURE 4 ) the constriction extends to half the protibial length. The shape of the cordiform glabrous region in males of P. phetchabunensis sp. nov. is relatively wider anteriorly near the humeral region ( Figs. 2F View FIGURE 2 , 10A View FIGURE 10 ) than that of P. salvazai ( Figs. 2G View FIGURE 2 , 11A View FIGURE 11 ). The aedeagus of P. phetchabuensis sp. nov. differs considerably from that of P. salvazai in having an evenly tapered median lobe ( Fig. 10B–C View FIGURE 10 ), compared to that of P. salvaza i which is constricted close to mid-length, with the apex arcuate in lateral view ( Fig. 11B–C View FIGURE 11 ). Females of P. phetchabunensis sp. nov. can be distinguished from those of P. salvazai in having the elytral apex obliquely truncated ( Fig. 10E View FIGURE 10 ) rather than rounded ( Fig. 11E View FIGURE 11 ).

Etymology. The name of the species, phetchabunensis , is an adjective in reference to the Phetchabun mountain range where the type material for this new species was collected.

Distribution. This species is currently known from Phu Hin Rongkla National Park and Phu Kradueng National Park ( Fig. 13D View FIGURE 13 ) and Phu Rua National Park, which are all within the Phetchabun mountain range ( Fig. 14B View FIGURE 14 ); this is an area exhibiting high levels of endemism among aquatic insects ( Sites & Polhemus 2001; Vitheepradit & Sites 2007), including whirligig beetles ( Gustafson et al. 2016). Additonally, this species has been collected from Doi Phu Ka National Park which is located within the Luang Prabang mountain range ( Fig 14B View FIGURE 14 ).

KKU

Herbarium, Department of Biology, Khon Kaen University

NHMW

Naturhistorisches Museum, Wien

Kingdom

Animalia

Phylum

Arthropoda

Class

Insecta

Order

Coleoptera

Family

Gyrinidae

Genus

Patrus