Trachelas joopili, Kim & Lee, 2008

Kim, Byung-Woo & Lee, Woncheol, 2008, Notes on four corinnid species from Korea, with the description of Trachelas joopili new species (Arachnida: Araneae: Corinnidae), Journal of Natural History 42 (27 - 28), pp. 1867-1884 : 1876-1882

Trachelas joopili new species

( Figures 4–5 )

Diagnosis

This new species can be distinguished from other congeners by male covered with numerous slender hairs, largely hooked tibial apophysis, cymbium posteriorly expanded, large triangular apophysis at base and distally developed, clockwise coiled linear tip (left palp), and palpal organs embolus slender linear, twice coiled along with slender distal cymbium and enclosing long wound loop of sperm duct at right lateral part (left palp), without median apophysis.

Description

Measurements (mm). Male: Habitus length 5.2; cheliceral length 1.1, cheliceral width 0.6, cheliceral fang length 0.5; clypeal height 0.2; carapace length 2.5, carapace width 2.1, carapace height 1.1; maxillae length 0.7, maxillae width 0.5; labium length 0.4, labium width 0.5; sternum length 1.2, sternum width 1.2; AER 0.7, PER 1.0, AME 0.14, ALE 0.16, PME 0.16, PLE 0.16. Eye formula ALE5PME5PLE.AME. Palp 2.9 (0.9, 0.3, 0.4, 1.3). First leg 6.8 (2.0, 0.9, 1.7, 1.4, 0.8), second leg 5.1 (1.9, 0.9, 1.6, 1.4, 0.7), third leg 4.5 (1.3, 0.7, 0.9, 1.2, 0.4), fourth leg 6.3 (1.7, 0.7, 1.4, 1.8, 0.7). Leg formula I IV II III. Abdomen length 3.0, abdomen width 2.1, abdomen height 1.7.

Male. Medium-sized spider, entirely covered with numerous slender hairs. Carapace elongate, granulated, dark-brown coloured, 1.2 times as long as wide, convex thorax, lacking lateral invagination, with indistinctly longitudinal fovea ( Figure 4A, H ). AER straight and PER slightly procurved in frontal view, PER longer than AER; AME separated by their diameter, and LERC ratio 48 ( Figure 4B ). Clypeal height 1.4 times as long as AME diameter and with chilum slender transverse sclerite ( Figure 4B ). Chelicerae with numerous long setae, with three promarginal teeth on groove, middle one largest, and two retromarginal teeth of subequal size ( Figure 4C ). Maxillae reddish brown, widest at anterior part, longitudinal depression on inner part ( Figure 4D ). Labium square as long as wide ( Figure 4D ). Sternum shield-shaped, sclerotized intercoxal angles, widest between second coxae, slightly produced between fourth coxae ( Figure 4E ). Legs ( Figure 4F, G ) yellowish brown, dark ring patterns on tibiae and metatarsi, spineless, tarsi bearing claw tufts; leg I, II with cusp in a row on ventral; leg I longer than leg IV; length (patella+tibia) of first leg longer than carapace length; trochanter not notched; tibiae with four to eight trichobothria (four on first and third leg, eight on second, five on fourth), metatarsi with three trichobothria on each segment, tarsi with four trichobothria on each segment; tarsal organ not visible to distal end of tarsus; tarsi with two claws. Abdomen ovoid, dark-brown coloured, with two pairs of muscular impressions and scattered brownish yellow spots on dorsum, without dorsal, epigastric and ventral scuta ( Figure 4A, H ).

Male palp ( Figure 5A–D ) without tarsal claw. Tibia slightly as long as wide, with large hooked apophysis; femur largely concaved on the distal ventral part; cymbium posteriorly expanded, large triangular apophysis at base and distally developed, clockwise coiled linear tip (left palp), and without cymbial furrow; tegulum expanded roundedly at base, enclosing long wound loop of sperm duct at right lateral part (left palp).

Material examined

Holotype male ( NIBR), 15 August, 2001, Mt. Ungilsan , Namyang-si, Gyeonggi-do, leg. B.W. Kim.

Etymology

The specific name is a patronym in honor of Dr. Joo-Pil Kim, the Korean arachnologist who supported the early stages of my taxonomic studies with dedicated assistance and encouragement.

Distribution

Korea (Mt. Ungilsan).

Remarks

The specimen was found wandering under stone on the ground.

A key to two genera ( Castianeira and Trachelas ) in Korea.

1. Male with scuta on abdomen and no tibial apophysis................................................ Castianeira ( C. shaxianensis )

1. Male without scutum and with developed tibial apophysis.. Trachelas (2)

2. Male median apophysis modified, hooked, with tegulum rounded at base and short embolus........................................... 3

2. Male median apophysis absent, with tegulum modified large triangular apophysis at base and embolus slender linear, twice coiled along with slender distal cymbium................................ T. joopili n. sp.

3. Male palp patellar apophysis present and female epigynal opening concave long oval longitudinally, expanded to atrial hood.......................................... T. japonicus Bösenberg and Strand, 1906

3. Male palp patellar apophysis absent and female epigynal opening small circle, not expanded to atrial hood..... T. acuminus ( Zhu and An, 1988)

Figures

Figure 4. Trachelas joopili new species, male. (A) Habitus, dorsal view; (B) eye area and clypeus, frontal view; (C) chelicerae, posterior view; (D) maxillae and labium, ventral view; (E) sternum, ventral view; (F) first leg, left part, prolateral view; (G) fourth leg, left part, prolateral view; (H) habitus, retrolateral view.

Figure 5. Trachelas joopili new species, male. (A–D) palp, left part, (A) prolateral view, (B) ventral view, (C) retrolateral view, (D) dorsal view. BPC, basal part of cymbium; CY, cymbium; DPC, distal part of cymbium; EM, embolus; FE, femur; MEA, median apophysis; SPD, sperm duct; TE, tegulum; TIA, Tibial apophysis.