First Record of Platybaetis Bishopi M Ller-Liebenau, 1980 and Baetiella Bispinosa (Gose, 1980) (Ephemeroptera: Baetidae) from Th
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774 Chiang Mai J. Sci. 2018; 45(2) Chiang Mai J. Sci. 2018; 45(2) : 774-783 http://epg.science.cmu.ac.th/ejournal/ Contributed Paper First Record of Platybaetis bishopi M ller-Liebenau, 1980 and Baetiella bispinosa (Gose, 1980) (Ephemeroptera: Baetidae) from Thailand Sirikamon Phlai-ngam and Nisarat Tungpairojwong* [a,b] [a] Department of Biology, Faculty of Science, Khon Kaen University, Khon Kaen 40002, Thailand. [b] Applied Taxonomic Research Center, Khon Kaen University, Khon Kaen 40002, Thailand. * Author for correspondence; e-mail: [email protected] Received: 21 November 2016 Accepted: 16 June 2017 ABSTRACT Platybaetis, M ller-Liebenau, 1980 and Baetiella (Gose, 1980) are baetid mayfly nymphs of the family Baetidae. This study reports the first discovery of Platybaetis bishopi M ller-Liebenau, 1980 and Baetiella bispinosa (Gose, 1980) in Thailand, with re-examination and illustration based on the P. bishopi M ller-Liebenau, 1980 nymphs from Narathiwat province. This study’s purpose is to revise the key characteristics of, specifically, the seven Platybaetis M ller-Liebenau, 1980 species currently found. Additionally, Baetiella bispinosa (Gose, 1980) nymphs from Chiang Rai province have been recorded for the first time in this region. Keywords: Baetiella bispinosa, Platybaetis bishopi, mayflies, new record, Thailand 1. INTRODUCTION Baetidae is a mayfly family that is species in West Malaysia [6] which was also common in both standing and running waters found from China [7]. Then, P. probus and is very diverse. Approximately 100 genera M ller-Liebenau, 1980 was reported and and 900 species of baetid mayflies have been described in Sabah (East Malaysia) [8]. discovered around the world, accounting for After that, P. sulawesiensis Tong & Dudgeon, one-quarter of the overall mayfly diversity [1]. 1999 and P. wallacei Tong & Dudgeon, 1999 Studies on the systematics and taxonomy of were reported from Indonesia [9]. Thus, baetids have been performed by many P. gadadjuensis Suter, 2001, a new species from researchers [2-4]. Among the baetid groups, Australia was described [10]. In 2011, Platybaetis M ller-Liebenau, 1980 is small genus P. mamasae sp.n. was newly described that was discovered and established by from Indonesia [11]. After that, in 2012, M ller-Liebenau in 1980. P. edmundsi M ller- P. arunachalae sp.n was found and described Liebenau, 1980 and P. uenoi M ller-Liebenau, from India [12] and in 2013, this species was 1980 were first reported in the Philippines synonymized with Acentrella (Liebebiella) vera and Nepal, respectively [5]. P. bishopi (M ller-Liebenau, 1982), originally described M ller-Liebenau, 1980 was described as a new from Malaysia [13]. Then, there are seven Chiang Mai J. Sci. 2018; 45(2) 775 species of Platybaetis M ller-Liebenau, 1980 11 species were listed and described. were reported around this world but there Four species- B. japonica (Imanishi, 1930), are no records of Platybaetis M ller-Liebenau, B. muchei (Braasch, 1978), B. trispinata (Tong 1980 species in Thailand. However, This study & Dudgeon, 2000), and B. tuberculata is the first report of P. bishopi M ller-Liebenau, (Kazlauskas, 1963) were described in both 1980 in Thailand with re-examination and nymphal and imaginal stages, while other illustration of nymphal specimens, along species-B. bispinosa (Gose, 1980), B. macani with the redrawing of some characteristics of (M ller-Liebenau, 1985), B. marginata other species in this genus. Another genus, (Braasch, 1983), B. imanishii (Braasch, 1983), Baetiella, was established by U no (1931) and B. ausobskyi (Braasch, 1983), B. armata (Braasch, based on Acentrella japonica (Imanishi, 1930) 1983) and B. innonata (Braasch, 1983) were which is a synonym of Baetiella [14]. This genus found and described only in the nymphal has been considered a subgenus of Pseudocloeon stage, and B. ladakae (Traver, 1939) was only or another species of the genus Baetis [15]. known at the imaginal stage, from Himalaya. The generic diagnosis of Baetiella nymph is as In a recent study, Shi & Tong (2015) reported follows: labial palps of three segments with and described three new species from terminal segment symmetric or asymmetric China (B. lanpingensis n. sp., B. sexta n. sp., and and the tip of apex usually coniform, dorsal B. spathae n. sp.), to bring the total to 14 species of thorax with tubercles or smooth, femora of mature nymphs of genus Baetiella in the with irregular row of long glabrate bristles world [14]. at outer margin and villopore present, gills usually present on abdominal terga I-VII, 2. MATERIALS AND METHODS paired or single protuberances present or Nymphs were collected by hand-picking absent, and terminal filament reduced from the riffles with cobbles in second- and and shorter than cerci (singular or multi- third-order shallow streams in northern segmented). The genus Baetiella can be and southern Thailand. The specimens were distinguished from the genus Gratia by the placed directly into vials and preserved in irregular row of long glabrate bristles at the 95% ethanol alcohol. Mouthparts were outer margin of the femora. This genus is dissected under the stereomicroscope and also close to the genus Acentrella, but were mounted on slides in glycerine for Acentrella nymphs can be differentiated by the examination and illustration. The specimens terminal segment of labial palp rounded to were kept in the Aquatic Insect Collection, truncate and femora with row of ciliated Department of Biology, Khon Kaen bristles at dorsal margin [14]. In 1987, around University (KKU-AIC). 12 species of Baetiella were reported and recorded by Walt and McCafferty [16]. 3. RESULTS AND DISCUSSION However, many mayfly researchers did not 3.1 Order Ephemeroptera agree that Baetis ursina (Kazlauskas, 1963) Family Baetidae should be transferred to the Baetiella species Genus Platybaetis M ller-Liebenau 1980 [14]. Baetiella trispinata was then reported by Platybaetis bishopi M ller-Liebenau, 1980 Tong and Dudgeon [15]. Then, Ishiwata Description. Mature nymph (Figure (2001) found Baetiella aino (Matsumura, 1931) 3A).The body length 10-13 mm, head width which is a synonym of Baetiella japonica 0.82-0.90 mm, head length 0.56-0.60 mm, (Imanishi, 1930). Before 2015, approximately cerci slightly longer than body, median 776 Chiang Mai J. Sci. 2018; 45(2) caudal filament reduced to one segment. caudal filament reduced to one segment Head: slightly wider than long, quadrangularly (Figure 1H). shaped (Figure 2B). Antennae brown, slightly Ecological notes: P. bishopi M ller- longer than head capsule. Labrum: very small Liebenau, 1980 nymphs usually inhabit with submerginal setae and feathered the fast flowing headwater streams (water setae along anterior margin (Figure 1A). velocity approximately 0.20 m/s to 1.21 Left mandible: the outer incisor with 3 blunt m/s) with mostly large boulder substrate denticles, inner incisor with 4 blunt denticles, (diameter size larger than 256 mm) and the space between molar and prostheca some cobble (64-256 mm). smooth, prostheca robust with small denticles apically, comb shape, an enlarged blunt tooth Material examined: Narathiwat with a row of 7 blunt denticles and small province; 17 nymphs, 26.iii.2016, Pacho denticles apically (Figure 1C). Right mandible: waterfall, Bacho district (06°32′63.38′′N; the outer incisor and inner incisor with 3 blunt 101°38′13.80′′E, 80 m a.s.l., water velocity denticles, prostheca slender than the one on 1.21 m/s) (KKU-AIC0001); 35 nymphs, left mandible and with small denticles apically, 27.iii.2016, Wang Thong waterfall, Ra-Ngae comb shape. The space between molar and district (06°41′78.47′′N; 101°38′10.60′′E, prostheca smooth with small teeth and 80 m a.s.l., water velocity 0.83 m/s) hair-like setae apically (Figure 1D). Maxillae: (KKU-AIC0002); 1 nymph, 21.v.2016, Suwari maxillary palpus 3-segmented with a small tip waterfall, Rueso district (06°28′26.16′′N; at apex (Figures 1E-F). Labium: paraglossae 101°42′10.60′′E, alt. 73 m a.s.l., water velocity slightly shorter than glossae, 2 large clavate 0.55 m/s) (KKU-AIC0003), Phatthalung spines at apex of glossae (Figure 2C), province; 8 nymphs, 16.v.2016, Khao Kram labial palpus 3-segmented (Figure 1B). waterfall, Srinakarin district (07°31′14.52′′N; Hypopharynx as in Figure 1G. Thorax: 099°52′45.00′′E, alt. 60 m a.s.l.) (KKU- pronotum and mesonotum rounded laterally AIC0004); Nakhon Sri Thammarat and wider than metanotum, Hind wing pads province; 18 nymphs, 17.v.2016, Kiriwong reduced. Legs: generally brownish and stout. stream, Lansaka district (08°27′13.02′′N; All three segments with dense row of long 099°44′22.32′′E, alt. 238 m a.s.l.) (KKU- fine feathered bristles on outer margin AIC0005); Trang province; 11 nymphs, (Figures 1I-J), inner margin near apex of 18.v.2016, Khao Lak waterfall, Muang tarsus with one long bristle (Figure 2D), tarsal district (07°43′44.28′′N; 099°44′20.46′′E, claw with a row of 7-9 denticles. Abdomen: alt. 61 m a.s.l.) (KKU-AIC0006); Songkhla abdominal terga generally brownish, each with province; 7 nymphs, 19.v.2016, Tone a pair of dark brown oblique submedial Nga Chang stream, Hat Yai district streaks and a pair of dark brown dots below (06°59′01.70′′N; 100°21′18.11′′E, alt. the oblique streaks, posterior margin with 558 m a.s.l., water velocity 0.5 m/s) (KKU- broad, rounded denticles. Gills present on AIC0007); 5 nymphs, 19.v.2016, Boriphat abdominal terga I-VII, single leaf-shaped, waterfall, Hat Yai district (06°59′41.76′′N; margin smooth with scattered fine setae, gills 100°08′58.26′′E, alt. 130 m a.s.l.) on tergum I without tracheation, terga II-VII (KKU-AIC0008).