Sadyattes panayense, Hennemann, 2025

Sadyattes panayense View in CoL sp. nov.

ZooBank: https://zoobank.org/NomenclaturalActs/ 4A0EAE39-920D-498F-9E5D-B731E41B77C6

( Fig. 19 View FIGURE 19 )

HT, ♀: Philippines, Panay Island , 09.06.1998, Purchased from dealer, IV.2000, Accession Number: PEB-3035 [ NHMUK, ex coll. PEB No. 3035] .

Differentiation. The ♀ of this new species (the only sex known) is morphologically very close to that of S. maganda sp. nov. from the island of Mindoro with which it shares the overall shape and long, lanceolate subgenital plate ( Figs. 19 View FIGURE 19 G-I). It may however be separated by the slightly less globose head and lack of the black postocular speckles seen in maganda ( Figs. 19D–E View FIGURE 19 ), less incrassate basal portion of the meso- and metafemora, rather spinose than serrate ventral dentations of the meso- and metafemora, which are comparatively less developed but more numerous and not as distinctly black as in maganda , less enlarged apical tooth of the two outer ventral carinae of the meso- and metafemora ( Fig. 19F View FIGURE 19 ), as well as the more narrowed and bilobed posterior margin of the anal segment ( Fig. 19H View FIGURE 19 ).

Etymology. Named after its type-locality, the island of Panay. Neuter.

Description. The unique holotype ( Figs. 19A–C View FIGURE 19 ) lacks the right mid leg and claw of the left mesotarsus. The left side of abdominal terga VII and VIII shows damage due to an injury that most certainly happened when the insect was still alive.

♀ ( Fig. 19 View FIGURE 19 ). Of average size (body length incl. subgenital plate 166.0 mm) and form for the genus with a long and lanceolate subgenital plate. General colour of the holotype ochraceous buff to mid brown, the abdomen somewhat darker brown due to preservation. Bases of profemora pale green ( Figs. 19D–E View FIGURE 19 ), all limbs with a slight orange hue and the carinae of mid and hind legs light green ( Fig. 19F View FIGURE 19 ). Dentations of the legs dark brown and tipped with black (ventral dentations in particular). Eyes russet and the antennae very dark reddish brown.

Head ( Figs. 19D–E View FIGURE 19 ): Oval, about 1.4x longer than wide, broadest at the eyes and with the genae just slightly narrowed in posterior portion; vertex moderately convex with the coronal line somewhat indented posteriorly and the lateral furrow notably indented throughout almost its entire length. Eyes moderately convex and their diameter corresponding to about 0.43x length of gena. Antennae almost reaching to posterior margin of mesothorax and roughly equal in length to profemora; the joints slightly unequal in length and irregularly decreasing in length towards tip of antennae. Scapus rectangular, somewhat compressed dorsoventrally and about 1.8x longer than wide.

Thorax: Pronotum roughly rectangular and slightly shorter but notably narrower than head ( Fig. 19E View FIGURE 19 ); the 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. Meso- and metanotum both with a fairly distinct medio-longitudinal carina. Mesothorax notably constricted anteriorly, somewhat inflated pre-medially and 4.5x longer than prothorax; the anterior margin of mesonotum with a shallow transverse bulge. Metanotum parallel-sided, about 0.43x length of mesonotum and 2x longer than wide. Pleurae simple, the sterna with a shallow medio-longitudinal ridge.

Abdomen: Median segment 1.4x longer than wide and about 0.7x length of metanotum, almost rectangular with lateral margins very weakly concave. Segments II–VII slightly sub-uniform in diameter, II–IV slightly increasing in length, V as long as IV and VI–VII decreasing in length; II somewhat longer than median segment and IV–V about 2.5x longer than wide. Terga smooth except for a shallow longitudinal bulge close to lateral margins and V with posterior margin just weakly inflated medially; sterna simple and only with a short median longitudinal carina posteriorly. Praeopercular organ formed by a fairly broad indention of the posterior margin of sternum VII, which has a narrowing pre-posteriorly, as well as a black verrucose swelling in front ( Fig. 19I View FIGURE 19 ). Terga VIII and IX uniform in width, VIII less than half as long as VII and IX roughly quadrate in outline and half as long as VIII. Anal segment with basal portion as wide as IX, tectate longitudinally and with a distinct concave medio-lateral excavation ( Fig. 19G View FIGURE 19 ); the posterior portion narrowed and unevenly angularly bi-lobate with a small and narrow posteromedian indention ( Fig. 19H View FIGURE 19 ). Epiproct very small and fully concealed under anal segment ( Fig. 19H View FIGURE 19 ). Cerci conical and tapering towards a fairly pointed tip, almost reaching to posterior margin of anal segment. Gonapophyses VIII moderately elongated and not reaching tip of anal segment, mostly concealed under it. Subgenital plate lanceolate with apical portion slightly but gradually narrowing towards a pointed apex; projecting beyond tip of abdomen by almost the length of terga VIII-X taken together ( Figs. 19G–I View FIGURE 19 ).

Legs: Moderately stocky with all carinae dentate; the ventral dentations generally more pronounced than the dentations of dorsal carinae. Profemora almost as long as pro- and mesothorax combined, mesofemora slightly shorter than mesothorax, metafemora reaching to posterior margin of abdominal segment IV and metatibiae reaching about one-third along segment VII. Posteroventral carina of profemora with about 22 distinct, triangular and acute teeth, the anteroventral carina with a similar number of somewhat more serrate teeth; posterodorsal carina supplied with about 18–20 small denticles. Dentations of mid and hind legs somewhat erratic dorsally; the two outer ventral carinae of meso- and metafemora with the two apical teeth somewhat enlarged and stronger than preceding. Medioventral carina of meso- and metafemora with nine (mesofemora) or 10–12 fairly distinct and strong spines, the three or four sub-basal ones of which are most prominent; medioventral carina of meso- and metatibiae spinose as well. Basitarsi with all carinae minutely denticulate (teeth least distinct on probasitarsus) and the dorsal carinae slightly raised and rounded apically; almost as long as remaining joints except claw taken together.

Measurements [mm]: Body(incl.subgenital plate)166.0, body 155.0,pronotum 5.4,mesonotum 29.5, metanotum 13.9, median segment 7.8, profemora 35.7, mesofemora 27.6, metafemora 33.2, protibiae 36.0, mesotibiae 22.7, metatibiae 33.8, antennae 26.0.

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

Distribution. Philippines (Panay [NHMUK – type locality]).