Arcobaetis sripadai, Kaltenbach & Kluge & Gattolliat, 2023
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publication ID |
https://dx.doi.org/10.3897/zookeys.1168.104844 |
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publication LSID |
lsid:zoobank.org:pub:28A21391-A433-4E80-8845-E5C0996EFAF0 |
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persistent identifier |
https://treatment.plazi.org/id/1883B5F0-BB80-4568-9A6F-F9597991CCE5 |
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taxon LSID |
lsid:zoobank.org:act:1883B5F0-BB80-4568-9A6F-F9597991CCE5 |
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treatment provided by |
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scientific name |
Arcobaetis sripadai |
| status |
sp. nov. |
Arcobaetis sripadai sp. nov.
Figs 13 View Figure 13 , 14 View Figure 14 , 15 View Figure 15 , 16 View Figure 16 , 17 View Figure 17 , 18 View Figure 18 , 19 View Figure 19
Type material.
Holotype. ♂ imago reared from larva, with its larval and subimaginal exuviae {specimen [XVIII] (5)2020}, Sri Lanka, foot of Sri Pada ( Adam’s Peak), Delhausie, river Seetha gangula; 6°50′3.48″N, 80°34′3.36″E; 7.II.2020; leg. N. Kluge & L. Sheyko; SPbU.
Diagnosis.
Larva (Table 1 View Table 1 ). The following combination of characters distinguish A. sripadai sp. nov. from other species of Arcobaetis gen. nov.: A) distal margins of segments in middle part of flagellum without enlarged spines (Fig. 14a View Figure 14 ); B) labial palp segment III sub-quadrangular, at base approx. as wide as distal margin of segment II (Fig. 14i View Figure 14 ); C) hind protoptera absent; D) claw with single row of denticles, most distalmost denticles larger, basal denticles small to minute (Fig. 15c View Figure 15 ); E) tergalii present on abdominal segments II-VII; F) posterior margin of tergum IV with triangular spines, slightly wider than long (Fig. 15f View Figure 15 ).
Descriptions.
Larva (Figs 13 View Figure 13 - 18 View Figure 18 ).
Cuticular colouration (Fig. 13a-g View Figure 13 ). Head, thoracic terga and pleura with diffusive brown, ochre, and colourless areas (Fig. 13d View Figure 13 ); thoracic sterna colourless. Legs pale ochre with brown apex of femur, base of tibia and band in distal part of tibia (Fig. 13a-c View Figure 13 ). Abdominal terga I-VII with nearly uniform colour pattern consisting of diffusive ochre and pale brown areas (Fig. 13e-f View Figure 13 ); tergum VIII nearly uniformly darker brown, with paler ochre anterior margin and anterolateral angles (Fig. 13f View Figure 13 ); terga IX-X uniformly pale ochre (Fig. 13g View Figure 13 ); all sterna I-IX and paraprocts pale ochre. Caudalii ochre.
Hypodermal colouration. Unknown.
Antenna (Fig. 14a View Figure 14 ). Spines at distal margins of flagellum segments not enlarged.
Labrum (Fig. 14b View Figure 14 ). Length 0.7 × maximum width. Dorsally with submedian setae and few long setae, not forming distinct submarginal arcs.
Right mandible (Fig. 14c View Figure 14 ). Number of denticles of incisor unclear (worn); kinetodontium with three denticles.
Left mandible (Fig. 14d View Figure 14 ). Number of denticles of incisor unclear (worn); kinetodontium with three denticles.
Hypopharynx and superlinguae (Fig. 14e View Figure 14 ). Lingua shorter than superlinguae, longer than broad. Superlinguae distally almost straight; lateral margins rounded; fine, long, simple setae along distal margin.
Maxilla (Fig. 14f View Figure 14 ). Galea-lacinia ventrally with two simple setae just proximad of canines. Medially with one spine-like seta and four simple setae. Maxillary palp approx. 1.1 × as long as galea-lacinia; palp segment II slightly shorter than segment I.
Labium (Fig. 14g, h View Figure 14 ). Inner margin of glossa with 14 or 15 spine-like setae, increasing in length distally; apex with three long and robust setae; outer margin with ca. ten spine-like setae; paraglossa ventrally with ca. four medium, simple setae in anteromedial area; dorsally with arc of ca. ten long, spine-like setae in distal area. Labial palp with segment I 0.8 × length of segments II and III combined. Labial palp segment II dorsally with row of three or four spine-like setae. Segment III sub-quadrangular; at base approx. as wide as distal margin of segment II; ventral surface with short, spine-like, simple setae and short, fine, simple setae.
Hind protoptera absent.
Legs (Figs 15a-c View Figure 15 ). Long and slender; middle and hind legs slenderer than fore legs; hind leg slightly longer than others; on fore leg, tibia and tarsus of subequal length, with patella-tibial suture on proximal ¹/2 of tibia; on middle and hind legs, tibia much longer than tarsus, with patella-tibial suture on proximal ¹/3 of tibia. Segments ratio of fore leg 1.4:1.0:1.0:0.2, middle leg 1.3:1.0:0.7:0.2, hind leg 1.2:1.0:0.7:0.2. Femur. Length 4.6 × maximum width. Outer margin with row of 5-7 short, spine-like setae, larger on fore leg and smaller on middle and hind legs; two apical setae larger, equal on all legs (Fig. 15a View Figure 15 ). Ventral side of femur with smaller pointed spine-like setae, larger and denser on fore legs, smaller and fewer on middle and hind legs. Tibia. Pointed, feathered, spine-like setae irregularly located on inner side of fore tibia (Fig. 15a View Figure 15 ) and on all sides of middle and hind tibiae (Fig. 15b View Figure 15 ); one preapical seta on outer side of each tibia. Tarsus. Ventral margin with row of short, curved, feathered, spine-like setae. Claw with one row of ca. ten denticles increasing from basal to distal ones and directed distally (Fig. 15c View Figure 15 ).
Abdominal terga (Fig. 15d-k View Figure 15 ). Posterior margin of terga: I smooth, without spines; II-X with triangular spines, increasing in length toward X; slightly longer than wide on tergum IV; row of spines on tergum IX interrupted behind bases of submedian setae (Fig. 15j View Figure 15 ). Posterior margin of tergum X with median concavity with smaller spines in it (Fig. 15k View Figure 15 ).
Abdominal sterna (Fig. 15l-m View Figure 15 ). Posterior margins of sterna: I-V smooth, without spines; VI-VIII with triangular spines (Fig. 15l View Figure 15 ). On sternum IX of male row of narrow pointed spines between protogonostyli, smaller and narrower spines laterad of protogonostyli and larger pointed spines laterad of them (Fig. 15m View Figure 15 ).
Paraproct (Fig. 15n View Figure 15 ). Posterior margin with ca. 16 stout spines. Surface scattered with scales.
Caudalii (Fig. 15o-p View Figure 15 ). Cerci and paracercus with small, elongate spines on posterior margin of each segment; on outer side of cercus several spines on each 2nd segment greatly enlarged and pointed; no such enlarged spines on paracercus.
Tergalii (Fig. 13f View Figure 13 ). Present on abdominal segments II-VII, subequal.
Subimago (Figs 16a-e View Figure 16 , 17d, e, I, j View Figure 17 ).
Cuticular colouration. Head and prothorax mostly brown. Mesonotum brown, medioparapsidal suture contrastingly colourless (Figs 16d View Figure 16 , 17e View Figure 17 ). Meso- and metathoracic pleura and sterna brown with colourless areas (Fig. 17d View Figure 17 ). Wing membrane colourless with microtrichial circles ring-like, brown (Fig. 16c View Figure 16 ). Legs mostly colourless with microtricha and microlepides dark brown, with brown markings on femur, at base and apex of tibia and margins of tarsomeres (Figs 16a, b View Figure 16 , 17i, j View Figure 17 ). Abdominal terga I-X and sterna I-VI uniformly brown, with all sigilla of the same colour as background; sterna VII-VIII with submedian sigilla paler than background, sternum IX of male with distal part and gonostyli colourless (Fig. Fig. 16e View Figure 16 ). Cerci colourless with setae dark brown.
Texture. Mesonotum with cross-striated polygonal areas bordered with microtrichia (Fig. 16d View Figure 16 ). Abdominal terga and sterna with outlined polygonal areas bearing two or more microtrichia each; sigilla diminished (Fig. 16e View Figure 16 ). On fore leg of male, 1st-4th tarsomeres covered with blunt microlepides, 5th tarsomere covered with pointed microlepides; on middle and hind legs, all tarsomeres co-vered with pointed microlepides (Fig. 16a, b View Figure 16 ).
Male imago (Fig. 17a-c, f-h, k View Figure 17 ). Head ochre with reddish. Antennae with scape and pedicel ochre with reddish-brown apices. Turbinate eyes narrow, cylindrical, red. Thorax ochre-brownish. Fore wings with membrane colourless, proximal portions of C and Sc+RA reddish-brown, other veins ochre-brownish. Pterostigma with ca. three crossveins. Hind wings absent. Legs of all pairs ochre with inner side reddish (Fig. 17f-h View Figure 17 ). Middle and hind tarsi with two apical spines (on 1st +2nd, and 3rd segments). Abdominal segments I-VI white with yellow stripe on posterior margin of each tergum and blackish spot on each stigma; terga VII-X yellow-ochre. Cerci whitish, with brown marking at each joining (Fig. 17k View Figure 17 ). Gonostyli whitish.
Genitalia (Fig. 18a-c View Figure 18 ). Unistyligers widely separated, with shallow, not sclerotised, conic projection between them. Each unistyliger cylindrical, distally widened and projected medially. First segment of gonostylus narrowing toward apex, poorly separated from 2nd segment. 3rd (apical) segment extraordinary small, much narrower than apex of 2nd segment. Gonovectes sharply bent. Sterno-styligeral muscle distinctly developed, but attached far from anterior margin of sternum; in single examined specimen sharply asymmetric.
Dimension. Fore wing length (and body length) 3.5 mm.
Etymology.
Specific epithet refers to the type locality at the foot of the Sri Pada ( Adam’s Peak).
Distribution.
Sri Lanka (Fig. 19 View Figure 19 )
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.