Sadyattes banwaon, Hennemann, 2025

Hennemann, Frank H., 2025, A review of Sadyattes Stål, 1875, with the descriptions of six new species from the Philippines (Phasmatodea: Platycraninae: Stephanacridini), Zootaxa 5610 (1), pp. 1-72 : 16-18

Sadyattes banwaon sp. nov.

ZooBank: https://zoobank.org/NomenclaturalActs/ F8A59088-CF9D-46DF-B9D5-2EE2D51DA287

( Fig. 3 )

HT, ♀: Philippinen, Mindanao Id., Prov. Agusan del Sur, San Francisco Munip., Borbon, local collector 24.IV.2012 [ RBINS, ex coll. FH] .

Differentiation. The ♀ of this new species (the only sex known) is morphologically very close to the ♀♀ of S. panayense n. sp, from the island of Panay and S. maganda sp. nov. from the island of Mindoro. With both species it shares the overall shape and long, lanceolate subgenital plate ( Figs. 3G–I ) but may be separated by the smaller size, proportionally shorter limbs, that have the all the dentations comparatively smaller and less developed, but instead possess a distinctly enlarged apical tooth on the two outer ventral carinae of the mesofemora ( Fig 3D ) and bear a distinct, rounded apical crest on the meso- and metatibiae. Moreover, the mesopleurae are reddish in colour ( Fig. 3E ) and distinguish this ♀ from that of maganda this species also differs by the slenderer meso- and metafemora and from panayense it may also be separated by the relatively longer mesothorax (5.5x vs. 4.5x longer than prothorax) and lack of a definite medio-longitudinal carina on the meso- and metanotum Moreover, also the structure of the praeopercular organ and shape of the anal segment as well as the comparatively larger epiproct distinguish banwaon from the other two ♀♀.

Etymology. Named after the Banwaon people, an indigenous ethnic tribe that is located in Agusan del Sur Province in Mindanao, the type-locality of this new species. They are traditionally nomadic forest dwellers but now typically live in settled villages, relying on agriculture and fishing for their livelihood. Neuter.

Description. The unique holotype lacks most of the antennae and has suffered from damage by dermestid beetles, which have destroyed considerable parts of the posterior portion of the head capsule as well as the left eye ( Figs. 3 E-F).

♀ ( Fig. 3 ). Small (body length incl. subgenital plate 139.0 mm) and of average form for the genus with a long and lanceolate subgenital plate. General colour of the holotype ochraceous buff with an olive hue on the abdominal terga and base of subgenital plate. Transverse anterior bulge of mesonotum and mesopleurae reddish ( Fig. 3E ), the latter with the upper area green in anterior half. Genae with a few irregular washed blackish speckles posteriorly and around compound eye ( Fig. 3E ). Dentations of the legs tipped with black (ventral dentations in particular). Eyes ochre and the antennae dark greyish brown with the apex of each joint dark yellowish.

Head ( Figs. 3E–F ): Oval, about 1.45x longer than wide, broadest at the eyes with the genae slightly narrowing; vertex moderately convex with a fine coronal line and the lateral furrow weakly indented posteriorly. Frons with a distinct, short and gently arched furrow just behind bases of antennae. Eyes moderately convex and their diameter corresponding to about 0.5x length of genae. Antennae broken in the holotype with the left antennae present only until the sixteenth joint; the joints slightly unequal in length and somewhat decreasing in length towards the front. Scapus rectangular, somewhat compressed dorsoventrally and about 1.8x longer than wide; medio-dorsal portion black longitudinally.

Thorax: Pronotum roughly rectangular and weakly constricted pre-medially, slightly shorter but much narrower than head; the lateral margins gently concave. Anterior margin gently concave and slightly inflated with a distinct transverse furrow behind; the median transverse sulcus weakly arched and just not reaching lateral margins of segment; in front with a pair of shallow median swellings ( Figs. 3E–F ). Meso- and metanotum with a weakly indicated medio-longitudinal line, otherwise wholly smooth. Mesothorax somewhat constricting in anterior onequarter, somewhat inflated pre-medially and 5.5x longer than prothorax; the anterior margin of mesonotum with a fairly well-developed transverse bulge and two low granules posterior of it. Metanotum parallel-sided, about half as long as mesonotum and 2.7x longer than wide. Pleurae simple, the sterna with a very shallow medio-longitudinal ridge ( Fig. 3C ).

Abdomen: Median segment almost 2x longer than wide, trapezoidal in outline with anterior margin notably narrower than posterior margin and only 0.45x length of metanotum. Segments II–VII slightly sub-uniform in diameter, II-IV slightly increasing in length and V–VII decreasing in length; II 1.3x longer than median segment and VII slightly longer than II, all on average 2.3x longer than wide. Terga smooth except for a shallow and obtuse longitudinal carina close to lateral margins; V with posterior margin somewhat inflated. Sterna with a moderately developed medio-longitudinal ridge. Praeopercular organ formed by an irregularly rugulose swollen posteromedian area on sternum VII, which has a small verrucose swelling in front and a shallow impression posteromedially ( Fig. 3I ). Terga VIII–X uniform in width, VIII about two-thirds as long as VII and IX about quadrate in outline and half as long as VIII. Anal segment roughly rectangular in dorsal aspect and somewhat longer than IX, rather weakly tectate longitudinally and only with a shallow concave post-median lateral excavation; the posterior margin obtusely angular laterally and slightly rounded medially with a small and shallow median indention ( Fig. 3H ). Epiproct large, scale-like with a distinct medio-longitudinal keel, almost semi-circular and distinctly projecting over anal segment ( Fig. 3H ). Cerci small, conical and tapering towards a narrow and pointed tip, slightly projecting over posterior margin of anal segment. Gonapophyses VIII moderately elongated, and not reaching tip of anal segment ( Fig. 3G ). Subgenital plate lanceolate with apical portion slightly but gradually narrowing towards a pointed, triangular apex ( Figs. 3H–I ); projecting beyond tip of abdomen by roughly the combined length of two terminal terga; basal portion with a prominent ledge-like longitudinal lateral carina ( Figs. 3G, I ).

Legs: Moderately slender and fairly short fort the genus with all carinae rather minutely dentate; the ventral dentations generally more pronounced than the dentations of dorsal carinae. Profemora about as long as mesothorax, mesofemora notably shorter than mesothorax, metafemora reaching three-quarters along abdominal segment IV and metatibiae only reaching to posterior of segment VI. Posteroventral carina of profemora with about 15–16 acutely pointed and sharp teeth, the anteroventral carina with about 20 broader and more closely as well as regularly spaced saw-like teeth; posterodorsal carina supplied with about 15–17 small denticles. Dentations of mid and hind legs small and rather spinose in shape; the two outer ventral carinae of meso- and metafemora with a prominently enlarged and broad triangular apical tooth, which is accompanied by a smaller tooth anteriorly on anteroventral carina ( Fig. 3D ; these notably more distinct on mesofemora). Medioventral carina of meso- and metafemora distinct and armed with eleven (mesofemora) or 12–13 moderately distinct spines, the three or four sub-basal ones of which are the most prominent; medioventral carina of meso- and metatibiae spinose as well. Posterodorsal carina of meso- and metafemora elevated into an almost semi-circular crest apically. Basitarsi with all carinae minutely denticulate (teeth least distinct on probasitarsus) and the dorsal carina slightly raised and rounded apically; slightly longer than following three joints taken together.

Measurements [mm]: Body(incl.subgenital plate)139.0, body 132.7, pronotum 4.6,mesonotum 26.7, metanotum 13.5, median segment 6.2, profemora 29.0, mesofemora 21.2, metafemora 27.0, protibiae 29.5, mesotibiae 18.4, metatibiae 25.8, antennae> 8.5.

Reamrks. So far only known from the unique ♀ holotype. Male and egg unknown.

Distribution. Philippines: Mindanao (Agusan del Sur, San Francisco Municipality, Borbon [RBINS – type locality]).

Figures

FIGURE 3. Sadyattes banwaon sp. nov. ♀ holotype [RBINS]: A. Habitus, dorsolateral view; B. Habitus, dorsal view; C. Habitus, ventral view; D. Knee-region of left midleg, anterolateral view; E. Head and prothorax, lateral view; F. Head and prothorax, dorsal view; E. Terminalia in lateral view; F. Terminalia in dorsal view; G. Terminalia in ventral view.