Ovia, Sankaran, Pradeep M., Malamel, Jobi J. & Sebastian, Pothalil A., 2017

Sankaran, Pradeep M., Malamel, Jobi J. & Sebastian, Pothalil A., 2017, On the new monotypic wolf spider genus Ovia gen. nov. (Araneae: Lycosidae, Lycosinae), Zootaxa 4221 (3), pp. 366-376 : 367-369

Ovia gen. nov.

Type species: Pardosa procurva Yu & Song, 1988 .

Etymology. The genus name is derived from the Latin word for sheep, ovis , and refers to the characteristic appearance of the anterior pockets of the epigynum, which resemble the horns of the females of certain species of sheep (e.g., Ovis canadensis Shaw, 1804 and Ovis dalli Nelson, 1884 ). It is considered feminine.

Subfamily placement. Within the family Lycosidae , the subfamily Lycosinae is supported by the male copulatory bulb with a transverse median apophysis with a ventrally directed spur and a sinuous channel dorsally ( Dondale 1986: figs 10, 12–13). The median apophysis of the pedipalp of Ovia gen. nov. shows these features ( Figs 3 D, H, K–M, 5G), indicating that Ovia gen. nov. belongs to Lycosinae.

Diagnosis. Ovia gen. nov. resembles Alopecosa Simon, 1885 within the subfamily Lycosinae (see relationship below). The only putative synapomorphy proposed for Ovia gen. nov., which clearly demarcates this genus from Alopecosa , is the presence of an apical process (spur) on the median apophysis ( Fig. 5 E, G). Both males and females of Ovia gen. nov. differ from those of Alopecosa by having the cheliceral retromargins with three teeth ( Fig. 2 I–J). Males can be further distinguished by the following combination of features: subtegulum small and hardly visible ventrally, palea large and dorso-ventrally flattened, terminal apophysis large and hook-like, conductor with distal constriction, a very long embolus with highly reduced semi-transparent laminar extension on concave side, and a non-angular median apophysis ( Figs 3 D–E, G, I–M, 5B–C, E–G, I). Females can be recognized by the presence of large anterior pockets/epigynal hoods, absence of epigynal median atrium and enlarged lateral epigynal atria ( Figs 4 A–B, 5J). For details on Alopecosa , see Lugetti & Tongiorgi (1969), Dondale & Redner (1979, 1990) and Almquist (2005).

Description. Small lycosid spiders. Prosoma brownish to blackish, with iridescent scales, with (females) or without (males) a broad median band of whitish to creamy-white setae, with indistinct radial pattern. Anterior eye row slightly shorter than the posterior. Anterior eye row procurved ( Fig. 5 M), AME slightly larger than ALE. Chelicerae with three promarginal and three retromarginal teeth ( Fig. 2 I–J). Labium as wide as long. Sternum clothed with long black setae. Leg segments covered with iridescent scales. All tibiae and metatarsi without dorsal spines. Scopulae on metatarsi and tarsi absent. Tarsi provided with spinules. Leg formula 4123 (male) and 4132 (female). Opisthosoma dorsally with (females) or without (males) a broad median band of whitish to creamy-white setae, dorsally and laterally covered with iridescent scales.

Tip of male cymbium with a large, claw-like macroseta ( Figs 3 A–C, 5A–D). Subtegulum hardly visible in ventral view ( Figs 3 E, 5E). Palea broad, tongue-like, dorso-ventrally flattened and lacking a subterminal apophysis ( Figs 3 I–J, 5F). Terminal apophysis large, hook-like, grooved along the entire length and originating apicoretrolaterally on palea ( Figs 3 B, G, M, 5B, H). Median apophysis transversely oriented with apical and basal processes (spurs—Figs 3D–H, K–M, 5B–C, E, G). Embolus long, filiform, C-shaped, with highly reduced semitransparent laminar extension on concave side, originating apico-prolaterally to palea ( Figs 3 E–F, I–J, 5E–F). Conductor prominent, hyaline, with distal constriction ( Figs 3 H, K, M, 5B–C, I).

Epigynum hirsute, with large paired, lateral atria ( Fig. 4 A–B). Median septum incomplete (i.e., not inverted ‘T’ shaped), not set in median atrium ( Figs 4 A–B, 5J). Copulatory openings small, lying near to or at the posterior borderline of epigynum. Anterior pockets/epigynal hoods prominent, deep, long, reaching up to the anterior borderline of the epigynum ( Figs 4 A–C, 5J–K). Spermathecae highly sclerotised, long, extending up to the tip of epigynal hood, stalk of spermathecae with tenuous convolutions ( Figs 4 C, 5K).

Distribution. Indomalayan region: China, India, Taiwan (Fig. 7).

Species included. Only the type species, Ovia procurva comb. nov.

Relationships. Phylogenetic relationships of Ovia gen. nov. to other lycosine genera are unclear, but it is possibly closely related to the Holarctic genus Alopecosa . Both Ovia gen. nov. and Alopecosa share the following putative synapomorphic features that support a sister-taxon relationship: a flat, transverse median apophysis that masks the median part of embolus, a short, conspicuous conductor oriented between the distal halves of terminal and median apophyses, a filiform embolus, and absence of subterminal apophysis. The new genus proposed herein probably does not belong within a monophyletic group of Alopecosa species, which is supported by a short, slender, lobe-like terminal apophysis (see Lugetti & Tongiorgi 1969: fig. 7b–c, Dondale & Redner 1979: figs 1–3, 16). At this stage, one can hypothesize that Ovia gen. nov. might be of Holarctic origin, supported by the wide distribution of its type species, O. procurva (Fig.7) and the Holarctic distribution of Alopecosa . Once originated somewhere in the Holarctic region, Ovia gen. nov. might have invaded India after it collided with Eurasia some 50 M. Y.A., during the Early Eocene Epoch ( Briggs 1989) before the Grande Coupure Extinction Event (the Eocene- Oligocene Extinction Event).

Figures

FIGURE 2. Ovia procurva (Yu & Song, 1988) comb. nov.. A – C Male habitus: A dorsal; B ventral; C retrolateral; D – F female habitus: D dorsal; E ventral; F retrolateral; G – H habitus frontal: G male; H female; I – J left chelicerae, ventral view: I male; J female. Scale bars A – F, 2 mm; G – H, 1 mm; I – J, 0.5 mm.

FIGURE 3. Ovia procurva (Yu & Song, 1988) comb. nov. A – C Male Left pedipalp: A prolateral; B ventral; C retrolateral; D – H left bulb: D oblique ventro-retrolateral; E oblique ventro-prolateral; F prolateral; G retrolateral; H apical; I – J palea with embolus: I ventral; J dorsal; K median apophysis and conductor, retrolateral; L median apophysis, prolatero-ventral; M terminal and median apophyses and conductor, oblique retrolateral. Abbreviations: C conductor, E embolus, MA median apophysis, ST Subtegulum, TA terminal apophysis. Scale bars A – C, 0.5 mm; D – M 0.2 mm.

FIGURE 4. Ovia procurva (Yu & Song, 1988) comb. nov. A – B Epigynum: A before clearing, ventral; B after clearing, ventral; C vulva, dorsal; D epigynum with mating plug. Scale bars 0.2 mm.

FIGURE 5. Ovia procurva (Yu & Song, 1988) comb. nov. A – D Male left pedipalp: A prolateral; B ventral; C retrolateral; D entire, prolateral; E left bulb, oblique prolatero-ventral view showing subtegulum; F palea with embolus, ventral; G median apophysis, ventral; H terminal apophysis, oblique retrolateral; I conductor, apico-lateral; J epigynum, ventral; K vulva, dorsal; L schematic course of copulatory duct and stalk of spermathecae, dorsal; M female eye arrangement, frontal. Abbreviations: AP anterior pocket, AS apical spur, BS basal spur, C conductor, CO copulatory opening, E embolus, EA atrium of epigynum, EB embolic base, FD fertilization duct, HS head of spermatheca, MA median apophysis, MS median septum, PA palea, SS stalk of spermatheca, ST Subtegulum, T tegulum, TA terminal apophysis. Scale bars A – C, 0.15 mm; D & H, 0.4 mm; E, 0.1 mm; F, 0.04 mm; G, 0.3 mm; I, 0.03 mm; J – K, 0.05 mm; M, 0.1 mm.