Orestes draegeri, Joachim Bresseel & Jérôme Constant, 2018

Joachim Bresseel & Jérôme Constant, 2018, The Oriental stick insect genus Orestes Redtenbacher, 1906: Taxonomical notes and six new species from Vietnam (Phasmida: Heteropterygidae: Dataminae), Belgian Journal of Entomology 58, pp. 1-62 : 33-38

Orestes draegeri sp. nov.

urn:lsid:zoobank.org:act:7A7812DD-F531-4F71-9DA7-B5CBE925FB1B

Figs 5 , 18–20

ETYMOLOGY. The species is named after Mr Holger Dräger (Germany) in acknowledgement for breeding several stick insect species that we brought back from Southeast Asia.

TYPE MATERIAL. VIETNAM. Holotype ♂: Vietnam, Cat tien N.P. , 11°20’N 107°20’E, 6- 16.VII.2012, leg. J. Constant & J. Bresseel, I.G.: 32.161 ( RBINS).

Paratypes (2♂♂, 12 ♀♀): 4 ♀♀: same data as HT (2 ♀♀: RBINS; 2 ♀♀: VNMN); 2♂♂, 8 ♀♀: Vietnam: Dong Nai Biosphere Res., 11°18’N 107°06’E, 25.VI-6.VII.2012, leg. J. Constant & J. Bresseel, I.G.: 32.161, ex breeding R. Krijns (1♂, 6 ♀♀: RBINS; 1♂, 2 ♀♀: VNMN).

DIAGNOSIS. Slender elongate species with short legs ( Fig. 18 A , 19 A ). Closely related to Orestes mouhotii Bates, 1865 but distinguishable by the proportionally shorter legs (see Tables 5 and 7).

Males have the posterior margin of mesonotum conically raised and sulcate medially ( Fig. 18 D, I ).

Females with cephalic armature indistinct ( Fig. 19 I ), tergum IV indistinctly widening towards the posterior, almost parallel-sided ( Fig. 19 A ). Metatibiae with dorsal, laterally compressed, teeth anteriorly and centrally. The central tooth being more distinct. Posteromedial crest on tergum IX distinctly elongated and strongly tectiform ( Fig. 19 E–F ).

DESCRIPTION

MALE ( Fig. 18 ).

Measurements: see table 5.

Head: supra-antennals spinose and slightly pointed outwards, followed by four smaller, spinose supra-occipitals. Vertex with anterior coronals distinctly enlarged, blunt and laterally compressed, creating ear-like processes. Supra-orbitals bluntly spinose. Posterior and lateral coronals present as small, spinose tubercles forming a corona with the apex of the postocular carina. Eyes relatively small, circular and strongly projecting hemispherically. Antennae shorter than legs, with 23 segments (n = 3); scapus strongly flattened dorsoventrally and laterally carinate with a spine laterally and posterolaterally; pedicellus slightly dorsoventrally flattened. First antennomere distinctly shorter than scapus. Antennomeres gradually getting longer till segment XII. Antennal segment XIII the longest, with minute hump anterolaterally; following segments shiny and distinctly shorter. Apical antennomere elongated, slightly longer than the two preceding antennomeres combined.

Thorax: pronotum almost parallel-sided, slightly wider posteriorly, longer than wide and rugose and with anterior margin incurved. Prozona slightly elevated centrally. Posterior margin indistinctly rounded. Mesonotum with anterior margin concave; slightly bent laterally; posterior margin wider than anterior one with a distinct conical hump posteromedially. Hump slightly sulcate medially. Mesopleura slightly widened above coxae; widened portion rounded and notched medially. Metanotum concave laterally, posteromedially with two minute granules; posterior margin well marked. Metapleura widened above coxae, rounded and notched posterolaterally. Prosternum with sensory areas elongate oval. Sensory area on profurcasternum small and subcircular. Ventral surface of body rugose.

Legs: profemora unarmed, curved basally with carinae more distinct compared to other femora, except for the medioventral carina; posterior margin with small blunt spine dorsally; about as long as metanotum and median segment combined. Mesofemora unarmed, only slightly shorter than profemora and with especially dorsal carinae indistinct. Metafemora about as long as profemora; unarmed or with one to two humps dorsally. Protibiae with inner dorsal carina more distinct, slightly shorter than corresponding femora and unarmed. Meso- and metatibiae with carinae indistinct, slightly shorter than corresponding femora and unarmed. Tarsomeres I–III about the same length with a posteromedian rounded hump dorsally. Claws very small.

Abdomen: median segment unarmed, rugose and strongly transverse. Abdominal terga rugose, terga II–V about the same length; tergum VI slightly shorter; tergum II almost quadrate, slightly narrowing towards the posterior; terga III–VII parallel-sided posteromedially, unarmed or sometimes armed with two minute granules posteromedially. Posterior margin of tergum VII concave; tergum VIII slightly wider than VII, trapezoidal and widening towards the posterior, with posterior margin concave; IX about as long as VIII, transverse, with posterior margin slightly raised with minute granules. Anal segment dorsoventrally flattened, parallel-sided and notched posteromedially. Posterolateral angles broadly rounded. Poculum more or less rounded and strongly granulose; posterior rim dorsoventrally flattened, thickened and broadly rounded posteriorly. Poculum projecting over base of vomer but not reaching base of apical spine. Cerci short, strongly flattened and setose, not reaching apex of tergum X, with apices broadly rounded to almost straight. Vomer well developed, semicircular basally till base of posteromedial spine; posteromedial spine broad, strongly upcurving with an angle of almost 90° and blackish in posterior portion.

FEMALE ( Fig.19 ).

Measurements: see table 5.

Head: supra-antennals, supra-occipitals, posterior- and lateral coronals present as minute granules, posterior coronals more distinct. Postocular carina distinct, apically with minute granule. Other armature indistinct. Vertex not elongated or raised but slightly rounded. Between lateral coronal and supra-orbital two equally sized granules. Eyes relatively small, circular and strongly projecting hemispherically. Antennae slightly shorter than legs, with 25 segments (n = 6); scapus strongly flattened dorsoventrally, laterally carinate and with a central hump and subapical blunt spine on outer lateral carina; pedicellus slightly flattened dorsoventrally, almost parallel-sided. First antennomere slightly longer than following two antennomeres combined; antennal segments IV to XV gradually becoming longer; following segments shorter except for apical antennomere which is elongated, club-shaped.

Thorax: pronotum trapezoidal, widening towards the posterior; anterior margin strongly convex. Prozona without elevation centrally and with few minute granules. Metazona with two to six minute granules and posterior margin slightly convex. Mesonotum rugose with anterior margin incurved. Anterior portion with four evenly spaced, paired, black granules. First pair posteriorly, last pair subcentrally. Posterior margin slightly wider than anterior one. Mesopleura slightly widened above coxae; widened portion slightly crenulated, notched medially. Metanotum rugose, more or less parallel-sided and concave posteriorly. Metapleura slightly widened above coxae, anterior portion with few small tubercles, posterolatelly notched and posteriorly with minute teeth. Prosternum with sensory areas elongate oval, not reaching lateral margins. Sensory area on profurcasternum small and rounded; anterior margin more or less straight. Meso- and metasternum relatively smooth with few granules.

Legs: femora with carinae relatively indistinct except for anterodorsal and ventral carinae of profemora; apex with small granule. Profemora rugose, shorter than mesonotum and curved basally. Mesofemora about as long as metanotum and median segment combined, dorsally with some laterally compressed, small granules. Metafemora about as long as profemora, with two triangular tooth dorsally, one centrally and one subapically. Tibiae with carinae relatively distinct and distinctly shorter than corresponding femora. Protibiae carinate and unarmed. Mesotibiae with a central rounded tooth dorsally. Metatibiae with a subanterior and central rounded tooth dorsally, central one more distinct. Tarsomeres I–III about the same length with a square posteromedian hump dorsally, IV distinctly shorter. Claws very small.

Abdomen: median segment rugose, strongly transverse and with posterior margin convex. Abdominal terga rugose; terga II–IV slightly, gradually widening towards the posterior; tergum IV with posterolateral triangular tubercle; posteromedially with a twin-crescentshaped granulose crest; tergum V slightly descending obliquely with central pair of granules, and posterior margin slightly narrower than anterior one; tergum V with a mediolongitudinal carina, diverging posteriorly, resulting into flattened triangular tubercles; triangular tubercles projecting over posterior margin of tergum V; tergum VI distinctly descending obliquely and with a mediolongitudinal carina, posterior margin distinctly narrower than anterior one and incurved; tergum VII almost parallel-sided, slightly tapering towards the posterior with a mediolongitudinal carina and incurved posteriorly; tergum VIII more or less parallel-sided, and slightly ascending; posterolaterally with a spinose granule and posteromedially with a pair of minute granules; IX slightly narrower than VIII with a distinct elongated and tectiform posteromedial crest; crest narrow apically; posterolateral margins of IX rounded and with several granules. Anal segment narrower than tergum IX and dorsally flattened; anteriorly with a median tubercle; sublaterally with an oblique row of tubercles reaching posterolateral angles; posterolateral angles lamellate and raised; posterior margin straight and granulose. Subgenital plate with a mediolongitudinal carina, more distinct posteriorly; rounded and boat-

shaped with widest part at about mid length; posterior rim dorsoventrally flattened; apex rounded, almost reaching margin of tergum X.

DISTRIBUTION. Vietnam, Dong Nai and Lam Dong provinces ( Fig. 5 ).

Figures

Fig. 18. Orestes draegeri sp. nov., holotype ♂. A, habitus, dorsal view. B, habitus, lateral view. C, habitus, ventral view. D, head and thorax, dorsal view. E, terminalia, dorsal view. F, terminalia anterodorsal view. G, terminalia,ventral view. H, terminalia,lateral view. I, head andthorax, lateralview.

Fig. 19. Orestes draegeri sp. nov., paratype ♀ from Dong Nai Biosphere Reserve. A, habitus, dorsal view. B, habitus, ventral view. C, head and thorax, dorsal view. D, terminalia, dorsal view. E, Terminalia anterodorsal view. F, terminalia, lateral view. G, habitus lateral view. H, terminalia, ventral view. I, head and thorax, lateral view.

Fig. 20. Orestes draegeri sp. nov. in nature. A, adult male, Dong Nai Biosphere Reserve, 30.VI.2012. B, adult female, same data.C–D, adult female Cat Tien N.P., 8.VII.2012.

Fig.5. Orestes. spp., distribution map.