Atypus minuta, Lee, Sue Yeon, Lee, Joon-Ho, Yoo, Jung Sun & Kim, Seung Tae, 2015

Lee, Sue Yeon, Lee, Joon-Ho, Yoo, Jung Sun & Kim, Seung Tae, 2015, A new species of the genus Atypus Latreille, 1804 (Araneae: Atypidae) from Korea, Zootaxa 3915 (1), pp. 139-142 : 139-141

Atypus minuta sp. nov.

( Fig. 1 A–H)

Type material. Holotype male, Deokcheon-myeon, Sanghak-ri, Jeongeup-si, Jeollabuk-do, Korea (35O 36’ 57’’ N, 126 O 48’ 15’’ E, altitude 46 m), 23 July 2008, S.T. Kim and S.Y. Lee leg., deposited in National Institute of Biological Resources ( NIBR), Ministry of Environment, Korea.

Etymology. The specific name is Latin meaning minute or small referring to the small size of male compared to other Atypus members.

Diagnosis. The male differs from those of other Korean Atypus species by the thick tip on the upper distal corner of the conductor ( Fig. 1 H) and leg IV without metatarsal spines. Atypus minuta sp. nov. is most similar to A. suweonensis in that the first pair of sigilla I are remote from the margin and the conductor is strongly bent, but it differs in general coloration of body, oval shape of the second pair of sigilla ( Fig. 1 D), pigmented retrolateral surface of leg patella, deep furrow of palpal femur, doomed granules on femur I, and short embolus ( Fig. 1 F–H).

Description. Male: Total length 14.4 (including chelicerae and excluding spinnerets). Body length 11.1. Carapace 4.2 long, 4.1 wide. Abdomen 4.1 long, 2.8 wide. Chelicerae 3.3 long, 2.6 wide. Endite 2.5 long, 2.1 wide. Labium 0.3 long, 1.0 wide. Sternum 2.9 long, 3.0 wide. AER 1.2, PER 1.3. Leg measurements; I: 11.7 (3.9, 3.5, 2.7, 1.6); II: 9.9 (3.1, 3.0, 2.2, 1.6); III: 9.3 (2.9, 2.6, 2.2, 1.6), IV: 12.9 (3.4, 3.2, 3.1, 3.2). Pedipalp 4.0 (1.3, 1.7, –, 1.0). Carapace longer than wide, reverse trapezoid-shaped (front 3.8, rear 2.2), lustrous and coriaceous, reddish brown generally with narrow black border, gently narrowed posteriorly; cephalic region darker, elevated; lateral margins with dark reddish brown stripes; thoracic region lighter, flat, gently rounded on both sides, emarginated posterior margins bearing conspicuous pleurites. Fovea broad and flat ‘W’ shaped, deeply imprinted behind midpoint of carapace occupying ca. 1/5 of carapace width at that point; cervical and radial furrows dark reddish brown, distinct and deeply imprinted ( Fig. 1 A). Eight eyes on black eye tubercle (0.6 long and 1.3 wide), AER and PER slightly recurved from above; eye sizes and interdistances: AME 0.20, ALE 0.23, PME 0.10, PLE 0.15, AME–AME 0.15, AME–ALE 0.07, AME–PLE 0.19, PME–PME 0.63, PME–PLE 0.41, PLE–PLE 0.95, ALE–PLE–PME contiguous, MOQ 0.4 long, front width 0.6, rear width 0.7 ( Fig. 1 B). Chelicerae longer than wide, reddish brown, robust, strongly developed with deep longitudinal furrow at base of retrolateral surface, 12 teeth on promargin of cheliceral furrow ( Fig. 1 C), prolateral and retrolateral surface with distinct granular texture. Sternum subequal in length and width, reddish brown with marginal ridges; four pairs of sigilla deeply imprinted, I, II, III ovoid, IV water drop-shaped, sigilla sizes and interdistances: I 0.4 long and 0.2 wide, 0.3 from margin; II, 0.4 long and 0.2 wide, 0.5 from margin; III, 0.5 long and 0.3 wide, 0.4 from margin; IV, 0.6 long and 0.4 wide, 0.5 from margin; I–I 0.9, II–II 1.3, III–III 1.3, IV–IV 0.4, I–II 0.1, II–III 0.1, III–IV 0.1 ( Fig. 1 D). Endites longer than wide, reddish brown with marginal ridges. Labium wider than long, reddish brown, strongly protrude in center ( Fig. 1 D). Leg formula 4123; reddish brown; all femora lack spines; short spines on ventral surface of tibiae I, II and IV; retrolateral surface of tibia of III, dorsal and ventral surfaces of metatarsus of I, whole surface of metatarsi II, III and IV; tarsi reddish brown, pseudosegmented; retrolateral membranous area on patella I purple; trichobothria inconspicuous; femoral granules on I and II doomed and smooth, respectively. Abdomen longer than wide, suboval, dull blackish brown, minutely wrinkled, dorsal scutum (3.5 long, 1.5 wide) covers ca. 4/5 of abdomen, blackish brown enclosing dark blackish brown tergite ( Fig. 1 A), venter with two pairs of lung opercula, upper pair vestigial, lower pair ovoid horizontally (2.0 long, 2.8 wide), dull blackish brown ( Fig. 1 E). Spinnerets pale blackish brown, AS 0.5, MS 0.4, PLS 0.9, 4 segmented: basal joint 0.5, median 0.6, subapical 0.4, apical 0.3 ( Fig. 1 E). Palpal tibia wider than tarsus, dark reddish brown; palpal cymbium without basal pit; narrow and deeply pitted straight furrow on femur; bulb small, globe-like, embolus short but stout, yellowish brown, spiniform; conductor almost transparent, minutely wrinkled, upper distal corner slightly bent upwards, tip of upper distal corner thick emarginately ( Fig. 1 F-H).

Female: Unknown.

Distribution. Korea (Deokcheon-myeon, Sanghak-ri, Jeongeup-si, Jeollabuk-do)

Ecological remarks. The holotype was collected by a pitfall trap at hillock near rice fields.

Figures

FIGURE 1. Atypus minuta new species. A, Body (habitus, specimen); B, Eye area (dorsal view); C, Left chelicera (retrolateral view); D, Endites, labium and sternum; E, Abdomen (ventral view); F, Left palp (prolateral view); G, Left palpal bulb (ventral view); H, Left palp (retrolateral view). Scale bars: A, 5.0 mm; B, F – H, 0.5 mm, C – E, 1.0 mm.