Metopobactrus cornis, Seo, 2018

Seo, Bo Keun, 2018, New species and records of the spider families Pholcidae, Uloboridae, Linyphiidae, Theridiidae, Phrurolithidae, and Thomisidae (Araneae) from Korea, Journal of Species Research 7 (4), pp. 251-290 : 262

Metopobactrus cornis n. sp.

ḇḍljHḑ (ṉÿ) ( Figs. 5H , 8 J-M)

Material examined. Holotype: ♂, mixed forest (35°22 ʹ 07 ʺ N, 127°47 ʹ 27 ʺ E, alt. 604 m), Samjang-myeon, Sancheong-gun , Gyeongsangnam-do, 29 June 2010, J. C. Lim.

Etymology. The specific name is a Latin adjective “ cornis ” (horned), referring to the shape of the raised cephalon.

Diagnosis. The new species resembles M. ascitus (Kulczyński, 1894) in the uplifted head, the embolic division and embolus, the bristles on retrolateral tibia, and developed suprategular apophysis, but different from the latter by the shapes of embolic division and suprategular apophysis ( Fig. 8 L-M).

Description. Male (holotype). Total length 2.00. Habitus as in Figure 5H . Carapace reddish brown, 0.94 long, 0.80 wide; head uplift raised twice, with PME on both sides of second uplifted head and without sulcus ( Figs. 5H , 8 J-K). Clypeus height 6.3 times of diameter of AME. AER 0.23, PER 0.26; AER recurved slightly and PER procurved in dorsal view. AME 0.05, ALE 0.07, PME 0.05, PLE 0.07, AME-AME 0.02, AME-ALE 0.01, PME-PME 0.09, PME-PLE 0.12, AME-PME 0.14, and ALE-PLE contiguous. Median ocular quadrangle, height>posterior side>anterior side (19:11:10). Chelicera with six promarginal and five retromarginal teeth. Sternum 0.57 long, 0.61 wide. Labium 0.22 wide. Leg measurements: I 2.82 (0.78, 0.26, 0.73, 0.66, 0.39), II 2.75 (0.74, 0.26, 0.68, 0.68, 0.39), III 2.44 (0.66, 0.22, 0.59, 0.61, 0.36), IV 3.22 (0.90, 0.26, 0.86, 0.81, 0.39). Leg I/c 3.00. Fem. I/c 0.83. Tib. I/c 0.78. Met. I/c 0.70. Pat. I + tib. I/c 1.05. Met. I/tar. I 1.69. Met. IV/tar. IV 2.08. Chaetotaxy 1-1-1-1. Tm 1 0.80, Tm IV present. Abdomen oval and dark gray, with two pairs of pale dots and 1.20 long, 0.86 wide. Palp ( Fig. 8 L-M): tibia with a long pointed dorsal apophysis and a short pointed retrolateral apophysis; embolic division curled with thin curled embolus; tegulum broad and elongate; suprategular apophysis highly developed, broad and curved, with denticles at distal part.

Habitat. Mixed forest.

World Distribution. Korea (Gyeongsangnam-do).

Deposition. NIBR.

Identifier. Bo Keun Seo.

Figures

Fig. 5. Habitus of linyphiid species (I): A -Cnephalocotes ferrugineus n. sp., male; B - idem, female; C - Diplocephaloides falcatus n. sp., male; D - idem, female; E - Hylyphantes nigritus (Simon, 1881), male; F - idem, female; G - Hypselistes australis Saito and Ono, 2001, female; H - Metopobactrus cornis n. sp., male; I - Pelecopsis bigibba n. sp., male; J - idem, female; K - Pelecopsis brunea n. sp., male; L - idem, female; M - Pelecopsis montana n. sp., male; N - Tapinocyba parva n. sp., male; O - idem, female; P - Tapinocyba subula n. sp., male; Q - idem, female; R - Walckenaeria supercilia n. sp., male; S - Diplostyla concolor(Wider, 1834), male; T - idem, female. Scale bars: 0.5 mm.

Fig. 8. Hylyphantes nigritus (Simon, 1881) A-F), Hypselistes australis Saito and Ono, 2001 (G-I), and Metopobactrus cornis n. sp.(J-M): A, L - male left palp, retrolateral view; B, M - idem, prolateral view; C - idem, tibial apophysis, dorsal view; D-E, G-H - epigynum; F, I - internal genitalia; J - male head, lateral view; K - idem, frontal view. Scale bars: 0.5 mm (J), 0.1 mm (rest).