Parasyscia ganeshaiahi, Aswaj & Sahanashree & Udayakantha & Aniruddha & Priyadarsanan, 2021

Aswaj, Punnath, Sahanashree, Ramakrishnaiah, Udayakantha, Warnakulasuriyage Sudesh, Aniruddha, Marathe & Priyadarsanan, Dharma Rajan, 2021, Two new species of doryline ants (Hymenoptera, Formicidae) with 11 - segmented antennae from India, ZooKeys 1056, pp. 59-72 : 59

Parasyscia ganeshaiahi sp. nov.

Fig. 2A-F

Material examined.

Holotype One worker, point mounted. Original label: " India, Arunachal Pradesh, West Kameng, Eaglenest WLS, 27.0433°N, 92.4209°E, 1400m, Winkler extraction method, 14th April 2013, Aniruddha Marathe leg." [NBAIR/HYM-FOR/1721-1].

Worker description.

Measurements and indices (holotype): BL 2.82; HL 0.58; HW 0.46; EL 0.05; TL 0.31; SL 0.22; PRW 0.32; WL 0.79; PL 0.21; PH 0.39; PW 0.30; PPL 0.39; PPH 0.44; PPW 0.45. Indices. CI 79; EI 11; SI 48; PI1 54; PI2 143; PPI1 89; PPI2 115; WI 150 (all measurements in mm). Head. In full-face view, rectangular, distinctly longer than broad; lateral margin weakly convex; posterior margin weakly concave (Fig. 2A ). Antennae 11 segmented; scape short, when folded back fail to reach posterior margin of eyes; Antennal segment II almost as long as broad; segments III-X distinctly broader than long; apical segment (XI) swollen forming a distinct club, 2 ×longer than IX-X combined (Fig. 2F ). Frontal carinae short, united and slightly extended behind the antennal socket. Eyes small; located slightly anterior to the mid-length of head (Fig. 2A ). Mandibles triangular; masticatory margin with a row of denticles (Fig. 2F ). Mesosoma. In dorsal view, elongate with almost parallel lateral sides (Fig. 2C ). In profile view, dorsal outline weakly convex; promesonotal suture and metanotal groove absent (Fig. 2B ). Propodeal declivity in profile view, lightly concave; declivous face with distinct carina across the top and along the lateral margins; propodeal lobe in profile view, strongly convex (Fig. 2B, C ). Metasoma. Petiole in dorsal view, distinctly broader than long; anterior and lateral margin with distinct carina; anterior and posterior margins transverse (Fig. 2B, D ). In profile view, petiole shorter than high with weakly convex dorsal outline. Postpetiole in dorsal view, larger than petiole; broader than long; strongly convex posterior margin (Fig. 2D ). In profile view, postpetiole shorter than high; dorsal outline weakly convex (Fig. 2B ). Abdominal tergite IV (first gastral tergite) in dorsal view, elongate, occupying most part of gaster; anterior margin strongly concave; lateral sides strongly convex. Base of cinctus of first gastral tergite with cross ribs (Fig. 2E ). Sculpture. Body with numerous distinct foveolae with smooth interspaces. Propodeal dorsal surface medially with a distinct unsculptured area. Postpetiole with more closely-spaced foveolae. First gastral tergite anteriorly with large foveolae and posteriorly with smaller foveolae. Remaining gastral segments anteriorly smooth and posteriorly with small foveolae.

Pilosity. Body covered with erect to sub-erect hairs. Sides of head and legs with relatively shorter hairs. Apical antennal segment with abundant short decumbent hairs. Body coloration. Body mainly yellowish brown. Antennal segment III to X and mandibles reddish brown.

Recognition.

Parasyscia ganeshaiahi sp. nov. is similar to the Palearctic P. piochardi Emery, 1882 in general appearance and 11-segmented antennae. Parasyscia piochardi is known from Israel, Lebanon, Syrian Arab Republic and Turkey ( AntWeb 2021; Bolton 2021). Parasyscia ganeshaiahi is distinguished from P. piochardi by the following characteristics: 1) head in full-face view, rectangular with weakly convex lateral sides in P. ganeshaiahi (head nearly oval shaped with strongly convex lateral sides in P. piochardi ); 2) strong sculpturing with relatively larger foveolae in P. ganeshaiahi (weakly sculptured with shallow, small foveolae in P. piochardi ); 3) head in full-face view, fovea larger in size and comparatively closely spaced in P. ganeshaiahi (fovea smaller with distinct unsculptured area present in P. piochardi ); 4) frontal carinae united posteriorly and extended behind in P. ganeshaiahi (frontal carinae not united and extended behind in P. piochardi ); 5) mesosoma in dorsal view, with nearly straight lateral margins in P. ganeshaiahi (mesosoma in dorsal view, medially concave in P. piochardi ); 6) petiole in profile view, with straight anterior slope in P. ganeshaiahi (weakly convex anterior margin in P. piochardi ); 7) anterior margin of petiole in dorsal view, with a distinct carina in P. ganeshaiahi (carina absent in P. piochardi ); 8) P. ganeshaiahi is a smaller species, HW 0.46, TL 2.82 in ( P. piochardi is larger, HW 0.53, TL 3.40); 9) P. ganeshaiahi has comparatively bigger eyes in relation to head width, EI 11 ( P. piochardi has smaller eyes in relation to the head width, EI 6).

Habitat.

The type specimen was collected from the Eaglenest Wildlife Sanctuary at an elevation of 1400 m above sea level. The collection site has a canopy cover of about 90% with low light penetration. The soil had a pH of 6.83 and temperature 17°C at the time of collection. A single worker specimen was collected using a Winkler extractor from sifted leaf litter taken from 1 m2, which accounted for 760 ml of leaf litter. We captured three additional ant genera ( Aphaenogaster , Carebara and Paratrechina ) in the same trap.

Distribution.

Indomalaya: India (Arunachal Pradesh).

Etymology.

With 2021 being the 25th anniversary of ATREE, this species is a Latin noun in the genitive case named in honour of one of its founders, Prof. K. N. Ganeshaiah, eminent ecologist and writer, who was instrumental in establishing Insect Taxonomy and Conservation Laboratory in ATREE.

Figures

Figure 2. Parasyscia ganeshaiahi sp. nov., holotype worker A head in full-face view B body in profile view C mesosoma in dorsal view D petiole and postpetiole in dorsal view E girdling constriction and gaster in dorsal view F antenna and Mandibles.