Depressacca macrolima Tan & Japir & Chung 2024, sp. nov.
Creators: name: Tan, Ming Kai
name: Japir, Razy
name: Chung, Arthur Y. C.
Publisher: name: Zenodo
Year: 2024
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Orthoptera
Tettigoniidae
Depressacca
Depressacca macrolima

description: Depressacca macrolima sp. nov.
(Figs 1–4)
Material examined. Holotype: EAST MALAYSIA: Sabah State • ♀; Tenompok Forest Reserve; N6.01839, E116.50276, 1397.0± 10.8 m.a.s.l.; 6 November 2023, 20h30; under the foliage of a small tree; coll. M.K. Tan, R. Japir, M.A.B. Asidi & D.F.A. Damit; SBH.23.192 (FRC).
Etymology. The species name refers to the numerous large and falcate spines on the legs characteristics of the species; macro = large, long in Latin and līm(us) = askew, aslant in Latin.
Diagnosis. The new species differs from both Depressacca globosa Ingrisch, 1998 from Kalimantan and Depressacca kinabalu Ingrisch, 2020 from Mount Kinabalu in Sabah by the large, flattened and falcate spines on middle and posterior femora and the dorsal margin of the posterior tibia; the presence of more spines on the legs in general; the presence of black spots on the tegmina; and by the tegmina not tapering towards apex and having the apex rounded (instead of narrow).
The new species differs from the female of Depressacca globosa by the shape of the subgenital plate having more slender apical lateral lobes (instead of triangular) and more truncated posterior margin between the lateral lobes (instead of broadly concave); and by the dorsal valves of the ovipositor having their apices more rounded. The new species also differs from the male of Depressacca kinabalu (known only from males) by the fastigium being distinctly narrower than and not surpassing the scapus (instead of nearly as wide as and reaching/ surpassing the scapus); and by the anterior margin of the pronotum emarginated in the middle (instead of broadly rounded).
Remarks. Even without a male specimen, the female can be easily differentiated from all other presently known congeners by its diagnostic characters.
Description. Habitus typical of congeners, dorso-ventrally compressed; head, pronotum, tegmina and legs when alive generally pale yellow green with marmorated green (Fig. 2). Head with fasgitium verticis compressed laterally, in dorsal view short-conical, distinctly narrower than and not surpassing antennal scapus, apex obtuse to subtruncate (Fig. 3A); green (Fig. 2). Antennal scapus pale green with tint of orange, apical margin with black ring (Fig. 3A); antennal segments generally orange (Fig. 2). Face in anterior view rectangular (Fig. 3B). Frons shining glossy with few scattered shallow dots towards genae (Fig. 3B). Eyes widely spaced, telescopically projecting (almost pointing laterally), typical of genus (Figs 3A, 3B). Apical segment of maxillary palpi unicolourous, long and slender, at apex bulbous; third and fourth subequal lengths, distinctly shorter than apical segment. Pronotal disc depressed, rugose, transverse suture barely visible; anterior margin broadly rounded and slightly emarginated in middle; posterior margin also emarginated in middle (Fig. 3A). Ventro-anterior angle forming a large spinose process (Fig. 3A). Ventral margin of pronotal lateral lobe strongly sinuous, anterior half higher, posterior half with margin rounded (Fig. 3C). Ventro-posterior angle in dorsal view right-angled, in lateral view rounded (Fig. 3C). Thoracic auditory spiracle (= thoracic foramen) not visible. Tegmen with lateral margins parallel, apex rounded, surpassing posterior knees; with a row of four round black spots along the anterior side of R vein, more or less equally spaced apart (Figs 2, 3D). Hind wing not surpassing tegminal apices. Anterior femur swollen, with strong ventral carina having four or five spines, at least three of which are larger than others; spines mostly black (Fig. 3E). Middle femur with strong ventral carina having five or six spines, at least three of which are larger, flattened and falcate; also mostly black (Fig. 3E). Anterior and middle femora at apical half with internal surface having two oblong black spots and with external surface having a long black band (Fig. 3E). Posterior femur with 13 spines, with large ones alternating with smaller ones; most spines falcate, typically with apex black, along ventral margin sometimes with tint of black (Fig. 3F). Anterior tibia with external and internal tympana conchate with fairly broad openings (Fig. 3G). Anterior and middle tibiae with a row of seven to nine small ventral spines (Fig. 3E). Posterior tibia with ventral margin at basal and apical parts each having three and four small black spines, respectively, basal ones hooked; with dorsal margin having five large falcate external spines and five small spinose internal spines (Fig. 3F). Tarsi pale yellow green with tint of black.
Female. Tenth abdominal apex faintly furrowed in middle; posterior margin forming two lateral stout lobes, rectangularly excised and truncated between lobes; lobes with apices rounded (Fig. 4A). Epiproct triangular with apex rounded (Fig. 4A). Cercus slender and nearly cylindrical, apical third slightly curved and tapering into conical apex pointing (Fig. 4A). Subgenital plate transverse-triangular; basal margin straight, rectangularly produced in middle; apex terminating with two triangular lobes, rectangularly excised between lobes with posterior margin truncated (Fig. 4B). Ovipositor bulging at base; compressed thereafter; ventral valves shorter than dorsal valves; dorsal margin concave posterior of basal area; middle of ovipositor abruptly widening and slightly convex, apex rounded; ventral margin in basal half substraight, in posterior half convex; both margins smooth (Fig. 4C).
Measurements (♀ holotype, in mm). BL = 16.1; BWL = 25.2; HW = 5.0; PL = 5.9; PW = 7.1; TL = 16.9; TW = 4.4; HFL = 10.5; HFW = 3.7; HTL = 10.1 length; OL = 9.1; OW = 2.5.
Ecology. This species was found in forested area in the highlands (more than 1000 m.a.s.l.), dwelling among understory plants.
Distribution. Borneo (Tenompok in Sabah).
Type locality. EAST MALAYSIA, Sabah, Tenompok Forest Reserve.
description: Published as part of Tan, Ming Kai, Japir, Razy & Chung, Arthur Y. C., 2024, An account on some katydids of the tribes Agraeciini (Conocephalinae) and Meconematini (Meconematinae) from the highlands of western Sabah, pp. 584-600 in Zootaxa 5419 (4) on pages 585-587, DOI: 10.11646/zootaxa.5419.4.6, http://zenodo.org/record/10798801