Trachyaretaon nakatago, Hennemann, 2023

Trachyaretaon nakatago View in CoL n. sp.

( Fig. 65-66 & 74 J-K)

ZooBank: https://zoobank.org/ 15ECC323-93BD-435E-BBF8-90C0FD9FF332

HT, ♀: Coll. R. I. Sc. N. B., Philippines, Luzon , Ilocos, leg. T. Heitzmann [ RBINS] .

PT, ♀, 1 egg: Philippinen, E-Luzon, Provinz Aurora, Dingalan Munip., 12.2012, local collector [ FH, No’s 1468-1 & E] .

PT, ♀, 1 egg: Philippines, NW-Luzon, Provinz Ilocos Norte, Adams Munip., VII.2012, local collector [ FH, No’s 1468-2 & E] .

PT, 1 ♀, 1 ♂: Philippinen, E-Luzon, Sierra Madre, Provinz Aurora, Daminagat , San Luis Munip., VI.2013, local collector [ FH, No’s 1468-3 & 4] .

Differentiation. – Females of this large new species are very similar to T.bresseeli n. sp. and T.carmelae and morphologically represent kind of an intermediate between these two species. From bresseeli they merely differ by the notably larger size and somewhat less stocky shape, smaller ventral teeth of the femora, more prominent mesosternals and much more distinct medio-longitudinal carina of the meso- and metasternum ( Fig. 65H), which is densely covered by small glossy granules. From carmelae they can be separated by being averagely smaller and slightly stockier, having the cephalic and thoracic armature notably more pronounced ( Fig. 65G),the dentations of the limbs less numerous and larger, the mesosternals larger, the medio-longitudinal carina of the meso- and metasternummore distinct and more densely granular ( Fig. 65H) and the posterior margin of the anal segment not notably inflated laterally. Males come morphologically closest to those of bresseeli but may be separated by the much more distinct medio-longitudinal carina of the meso- and metasternum ( Fig. 66E), smaller ventral teeth of the meso- and metafemora but more incrassate and dorsally rounded and raised subapical portion of the metafemora as well as the rounded and entire posterior margin of the poculum ( Fig. 66H).The eggs ( Fig. 74 J-K) are very similar to those of bresseeli and only differ by the less narrowed polar half of the capsule and slightly more downward directed posterolateral expansions of the micropylar plate. From those of carmelae the eggs of this new species can be differentiated by the somewhat smaller dimensions and less elongated shape (1.6x vs. 1.8x longer than high) and slightly shorter micropylar plate, which has the posterolateral expansion comparatively larger and broader.

Etymology. – The name ( nakatago Filipino = hidden) refers to the strong morphological similarity and intermediate position of this large new species between the Luzonese T. bresseeli n. sp. and T. carmelae (Lit & Eusebio, 2005) , which also occurs on the island of Luzon. Neuter.

Description

The colouration is described from dried specimens only.

♀ ( Fig. 65)

Form and colouration. – Large (body length 98.0-106.0 mm), shape fairly typical for the genus with moderately developed body armature and fairly low, but conical andmulti-tuberculated posterior meso- and metanotals; body surface sparsely and unevenly granular and tuberculate and with a fine medio-longitudinal dorsal carina. General colour fuscous or drab (specimen from San Luis) and a mixture of various tones of mid to dark brown, occasionally with some ochre to buff markings and portions particularly on abdominal terga; lateral surfaces of terga II-VII usually with an elongate archshaped black marking and sometimes a triangular black anterior lateral marking on tergum VIII. The paratype from Adams, Ilocos Norte ( Fig. 65 B-E) has a weakly indicated pale triangular anterior marking on the mesonotum and shows a hintof olive wash on the head, thoracic nota and basal portions of the femora. Granules of the medio-longitudinal keel of the meso- and metasternum glossy and contrasting russet in colour.Frons withtwo veryfaint roughly triangular dark brown markings. Eyes drab, antennae dark brown with some faint lighter annuli.

Head. – Scarcely longer than wide with vertex fairly inflated, conically rounded and slightly projecting over anterior margin of pronotum ( Fig. 65G). Supra-antennals distinct and acutely pointed;supra-orbitals similar in size and shape; genae only with 1-3 rather irregularly placed, small and rather node-like gulars. The median coronals rather small and conical, the lateral coronals notably larger, strong and conical with a broad base; two rather strong but short supra-orbitals present that are roughly equal in size to the median coronals; anterior portion of vertex with several variably sized tubercular to spiniform occipital medial tubercles. Eyes moderately projecting with anterior margin distinctly triangular and diameter of eye corresponding to 0.5x the length of gena. Antennae with 27 joints and reaching to abdominal segment IV; the median antennomeres strongly elongated. Scapus rectangular in dorsal aspect and longer than wide; pedicellus shorter, round in cross-section and somewhat constricting towards apex; III noticeably longer than pedicellus.

Thorax. – Pronotum scarcely longer and about as wide as head, with the lateral marginsconcave;the transverse median sulcus shallow, short, straight and short; surface sparsely and unevenly nodulose ( Fig. 65G). The strong pair of posterior pronotals represent the largest of the pronotal spines; anterior portion only witha low and conical pair of posterior mesal pronotals, the antero-lateral pronotals small, the inter-posterior pronotals onlyrepresented by small tubercles. Mesothorax gradually ascendant and widened towards the posterior, shape strongly trapezoidal with posterior margin 2.7x wider than anterior margin ( Fig. 65A); 2.3x longer than prothorax. Mesonotum just slightly trapezoidal in outline and only with a short pair of pre-median mesonotal tubercles; the median portion with a variable number of irregularly placed paired tubercles(two pairs of notably enlarged tubercles in holotype); compound posterior mesonotals rather low, conical and multi-tuberculated with the median tubercle somewhat enlarged, strong and conical; a small but conical pair of inter-posterior mesonotals present ( Fig. 65G). Lateralmargins unevenly tuberculated with the largest tubercles slightly spiniform.Mesopleurae increasinglywideningtowards posterior and with a fairly strong and conical mesopleural; otherwise minutely tubercular and with four notably enlarged, obtuse spines; no antero-lateral. Metanotum subquadrate with anterior portion narrowed, the posterior metanotals likethose of the mesonotum but slightlylower;the inter-posteriorsas on mesonotum and in front with a slightly enlarged pair of median metanotal tubercles. Metapleurae strongly expanded posteriorly; metapleural small but composite, the lateral margin unevenly tuberculated and with four conical and almost equally sized laterals as well as three unevenly sized supra-coxals. Sensory areas of prosternum large and semi-circular in outline. Meso- and metasternum ( Fig. 65H) densely granular and with a distinct, acute medio-longitudinal keel, which is densely set with glossy granules; mesosternum with three strongand conicalmesosternals on each side; metasternum only with one tubercle laterally.

Abdomen. – Median segment roundly trapezoidal in shape with anterior margin widely rounded; the four posteriors only represented by small nodes, surface otherwise only with a small paired of median nodes. Segments II-VII roughly uniform in width, II-IV slightly increasing and V-VII decreasing in length; all transverse with IV about 1.8x wider than long. Lateral margins of terga IV-VII weakly deflexed andobtuselyangular posteriorly;surface of II-VII with the medio-longitudinal carina very distinct and only with five small posterior tubercles (the median tubercle increasingly pronouncedfrom II toVII) and an indistinct pair of latero-anterior tubercles; surface otherwise smooth. Sterna smooth except for an anterior and posterior pair of granules and an irregularly, obtuse lateral carina ( Fig. 65E). Praeopercular organ formed by a moderately broad, angularly semi-circular median excavation of posterior margin of sternum VII, which otherwise is slightly inflated and forms a small swelling medially and at each outer angle ( Fig. 65F). Terga VIII and IX each with a small, obtuse posteromedian swelling that formed by an excrescence of the medio-longitudinal carina ( Fig. 65D); IX and X much narrower than all preceding segments. Anal segment progressively narrowing; the anterior two-thirds strongly descendant and with a distinct and obtuse medio-longitudinal bulge; the posterior margin somewhat inflated and bi-dentate with a fairly narrow triangular median indention. Epiproct straight in lateral aspect, about 1.2-1.4x longer than anal segment, weakly and obtusely tectate longitudinally and slightly gradually narrowing towardsa shallowly notched apex. Subgenital plate long, lanceolate and distinctly keeled in the apicalhalf; the apex narrowed, pointed and slightly surpassing tip of epiproct ( Fig. 65F).

Legs. – Moderately long and slender for the genus with the dentations moderately developed, the meso- and metafemora notably incrassated. Basal flexure and constriction of profemora weakly developed; the two exterior

– A. Holotype, dorsal view [ RBINS]. – B . Paratype, dorsal view [ FH 1468-2 ]. – C . Paratype, dorsolateral view [ FH 1468-2 ]. – D . Paratype, lateral view [ FH 1468-2 ]. – E . Paratype, ventral view [ FH 1468-2 ]. – F. Terminalia of holotype in ventral view [ RBINS]. – G. Head and thorax of holotype in dorsolateral view [ RBINS]. – H. Meso- and metasternum of paratype [ FH 1468-2 ] .

Faunitaxys, 11 (71), 2023: 1 – 135. 117

– A. Habitus, dorsal view. – B. Habitus, dorsolateral view. – C. Habitus, ventral view. – D. Head and thorax in dorsolateral view. – E. Meso- and metasternum. – F. Terminalia in lateral view. – G. Terminalia in dorsal view. – H. Terminalia in ventral view.

ventral carinae with two distinct and acute triangular teeth in apical one-third; dorsal carinae each with five low teeth that increase in size towards the base. All four carinae of meso- and metafemora with five teeth that become notably larger towards the apex of femur; those on the ventral carinae acutely triangular in shape (sometimes single much smaller intercalated denticles present), those on the dorsal carinae rather low but broader; medioventral carina very shallow and marked by minutely, densely set granules ( Fig. 65H). Pro- andmesotibiaewhollyunarmed, metatibiae onlywith afew smallventral denticulations in the apical half. Basitarsus a little longer than proceeding two joints taken together.

♂ ( Fig. 66)

Form and colouration. – Size fairly large (body length 61.5 mm), general form average for the genus, body armature moderately developed with the posterior meso- and metanotals prominent, spinose and rather minutely multi-tuberculose around the base; body surface sparsely granular to tuberculate; dorsal surface with an obscure medio-longitudinal carina. Colour of the unique specimenat hand a mixture of various tones of ochre and buff as well as mid brown on the meso and meatathorax, with the lateral portions of the metanotum and median segment mostly mid brown. Posterior meso- and metanotals as well as meso- and metapleurals ochre with a slight orangey hue. Ventralbody surfaceratheruniformlybuff with themetasternum, abdominal steran I-II and poculum mid to greyiosh dark brown. Limbs buff to drab with some irregular darker mottling; the tibiae wholly dark brown and the ventral surface of femora dark greyish brown in the apical half.Antennae pale ochre basally and becoming slightly darker towards the apex.

Head. – Shape and armature essentially as in ♀ but vertex somewhat less conical and all the spines slenderer and more spinose ( Fig. 66D). Eyes relatively larger, projecting hemispherically and the diameter of eye corresponding to about 0.6x length of gena.Antennae like in ♀ but reaching to posterior margin of abdominal segment IV.

Thorax. – Prothorax generally as in ♀ but slightly narrowing posteriorly, the lateral margins less concave and all elements of armature comparatively less pronounced; the posterior and anterior pronotals conical ( Fig. 66D). Mesothorax fairly elongate for the genus and 2.8x longer than the prothorax; anterior two-thirds slender and roughly uniform in diameter except for a slight widening at anterior margin, posterior portion strongly widened and inflated ( Fig. 66D). Mesonotum densely granular and somewhat tubercular along lateral margins with a shallow and obtuse medio-longitudinal bulge but otherwise unarmed; only posterior mesonotals prominent, strong, spinose and with a few small obtuse tubercles and granules around the base ( Fig. 66D). Metanotum with medio-longitudinal bulge somewhat more pronounced than on mesonotum; the median pair of tubercles small, the posteriors like those of the mesonotum but slightly larger. Pleurae with armature essentially like in ♀ but much less pronounced; the antero-lateral short but spinose and the meso- and metapleural larger, conical and more spinose in shape than in ♀. Meso- and metasternum ( Fig. 66E) more densely granulose than in ♀ with the medio-longitudinal carina slightly more distinct and granular; mesosternum with eight indistinct, low and obtuse paired mesosternals; metasternum only with two small tuberculiform metasternals laterally.

Abdomen. – Median segment distinctly trapezoidal in outline and with an obtuse medio-longitudinal bulge; only the second paired posteriors developed and represented as low tubercules. Segments II, VI and VII trapezoidal, III-V uniform in width, II-V slightly increasing and VI-IX decreasing in length; V longest segment and about 1.6x longer than wide. Terga II-VII with the medio-longitudinal carina fine and very obscure in IV and V, otherwise without any noteworthy armature. Sterna II-VII minutely granular and all with a distinct medio-longitudinal carina. Terga VI-VIII gradually widening with VIII widest of all abdominal terga; VIII-IX each with the medio-longitudinal carina pre-posteriorly raised and protruded into a shallow dentiform swelling ( Fig. 66F). VIII and IX transverse with lateral margins moderately deflexed and gently widened and in IX with the posterolateral angles somewhat protruded. Anal segment basically trapezoidal in dorsal aspect and strongly narrowing towards the posterior ( Fig. 66G); the lateral margins deflexed and forming an obtuse dentiform process anteriorly ( Fig. 66 G-H); the posterior margin narrow, somewhat inflated and bi-lobate with a distinct roundly triangular median indention; dorsal surface with a fine medio-longitudinal carina. Epiproct small, shield-shaped and almost fully concealed under anal segment; the paraprocts large with the apex dentiform and slightly projecting over posterior margin of anal segment ( Fig. 66 G-H). Vomer rather small and basically heart-shaped with base broad and the terminal point short, conical and distinctly arched towards the right. Cerci conical and compressed laterally. Poculum large, bulgy, obtusely cup-shaped ( Fig. 66F) and with an acute medio-longitudinal keel in the vertical posterior portion; posterior margin very broad and roundly angular ( Fig. 66H).

Legs. – Basically, with armature like in ♀, but all teeth somewhat smaller in comparison and more acutely pointed and spiniform on the ventral carinae of the meso- and metafemora; those on the dorsal carinae however noticeably less pronounced and almost wanting; hind legs projecting considerably beyond apex of abdomen. The basal two teeth on the two exterior ventral carinae of the metafemora represented as strong spines. Metafemora notably incrassate in the apical half with the dorsal portion characteristically raised and rounded (fig. 66B). Basitarsus slightly longer and slenderer than in ♀, the pro- and metabasitarsus notably longer than following three joints taken together.

Variability. – Only slight variability is seen in the colouration and development of the entire armature of the body and limbs in ♀. The holotype ( Fig. 65A) has all elements of the cephalic and thoracic armature somewhat more developed than the other two species, of which the example from Dingalan has the least developed tubercles and spines and is of a somewhat lighter general colour.Moreover, this specimen lacks the black lateral marking of the abdominal terga seen in the other two examples. The ♀ from San Luis is lighter in colour than all other examples and fairly plain ochraceous.

Egg ( Fig. 74 J-K)

Rather large for the genus; capsule slightly bullet-shaped with the posterior half weakly narrowing, slightly oval in cross-section; 2x longer than wide. Surface densely pitted; the operculum covered with short setae. Micropylar plate fairly small and about 0.6x the length capsule; basically Y-shaped with the median portion slightly gradually narrowing towards the anterior end and the two posterolateral extensions rather small, oval and extending on lateral surfaces of capsule at an angle of about85°; surface pitted like capsule and the outer margin notably inflated. Posterior portion widely V-shaped with a tiny bowl-shaped micropylar cup in centre. Median line distinct and formed by an obtuse, irregularly shaped bulge that reaches to the polar area and there terminates in a conical swelling. Operculum almost round and weakly convex; inserted into capsule roughly at a right angle. General colour plain greyish mid brown, the setae of the operculum sepia brown; outer margin of micropylar plate dark grey. Measurements [mm]: Length 4.8, width 2.4, height 2.5, length of micropylar plate 2.8.

Distribution. – North & Northeast Luzon.