Namkungia magnus ( Namkung, 1986 )

Kim, Byung-Woo & Lee, Woncheol, 2006, Redescription of the largest ice bug, Namkungia magnus com. nov. (Grylloblattodea, Grylloblattidae) from Korea, Zootaxa 1359, pp. 57-66 : 58-64

publication ID	https://doi.org/ 10.5281/zenodo.174644
DOI	https://doi.org/10.5281/zenodo.5660950
persistent identifier	https://treatment.plazi.org/id/C858F755-1F46-FFB1-E877-F9637BBA5C5F
treatment provided by	Plazi
scientific name	Namkungia magnus ( Namkung, 1986 )
status

Treatment

Namkungia magnus ( Namkung, 1986) View in CoL com. nov.

( Figures 1–2 View FIGURE 1 View FIGURE 2 )

Material examined. Holotype. 1ɗ, Balgudeok cave, Munung-ri, Jeongseong-gun, Gangwon-do, 4 May 1986, collected by Y.K. Kim. The holotype specimen has been deposited in the Arachnological Institute of Korea.

Diagnosis. This species resembles to the N. biyongensis (Namkung, 1974) in having large body length in size (longer than 30 mm), eyeless condition, more than 47 antennomeres, and 12 cercomeres but is distinguished by asymmetrical supra-anal plate of the bulging 10th abdominal tergite with truncate projection (dull in N. biyongensis ), 52 antennomeres in left (48 in N. biyongensis ), the cervical sclerite with nine (left) or 11 (right) setae (10 or 9 in N. biyongensis ) on lateral margin, and several copulatory sclerites of the genital structure; accessory copulatory sclerite composed of three parts, principal copulatory sclerite composed of two parts surrounded with left phallomeres and 1st accessory copulatory sclerites, and genital opening situated in the middle part of principal copulatory sclerite. Also, this species is the largest body length (43.3 mm) (38.5 mm in the original description) known and has the greatest 12 cercomeres (10 in the original description) like N. biyongensis .

Male:

Total body ( Fig. 2 View FIGURE 2 A) length 43.3 mm (measured from the anterior margin of rostrum to the posterior margin of tenth abdominal segment), found wandering on ground amongst stones in cave.

Head ( Figs. 1 View FIGURE 1 A, 2B) attached obliquely to pronotum. Cranium wider than long (length 6.1 mm, width 6.4 mm), with ten setae on each lateral margin, four setae around the antennal socket; epicranial suture distinct Y-shaped, reaching the circumantennal suture, and a pair of short parietal sutures extend from the occipital foramen over to the vertex. Clypeus distinctly 1.8 times wider than long (length 1.2 mm, width 2.1 mm), projected on its anterior middle part. Anterior tentorial pits sclerotized on their upper lateral margins. Eye absent, composed of the ocular seta. Antennae filiform composed of 49 antennomeres (52 in original description) on left part broken, 16 antennomeres on right broken, the 3rd segment (0.8 mm) 2.7 times as long as the 2nd segment (0.3 mm).

Labrum 1.5 times wider than long (length 1.1 mm, width 1.7 mm), broadly crescentshaped, covered with many setae on the middle and lower parts. Labial palp 2.6 mm (0.8+0.7+1.1), with three segments including the longest distal segment, symmetrical, many scattered setae on the 1st and 2nd, and absent on the 3rd. Paraglossa and glossa symmetrical, pointed, with many minute hairs on their apical parts. Maxilla symmetrical, hooked. Maxillary palp, 4.9 mm (0.4+0.6+1.3+1.2+1.4), with five segments including the longest distal segment, symmetrical, many scattered setae on the 1st and 2nd. Lacinia pointed, with two preapical teeth, a row of sparsely arranged many long setae on its inner margin.

Pronotum ( Figs. 1 View FIGURE 1 B, 2A) 1.1 times as long as wide (length 6.2 mm, width 5.7 mm), with six setae on the anterolateral, and clearly vertical suture on the middle. Mesonutum ( Figs. 1 View FIGURE 1 C, 2A) 1.2 times as wide as long (length 4.5 mm, width 5.3 mm), with many scattered hairs on the posterior, slightly concave in the posterior part, with five setae on the anterolateral part, with a long longitudinal suture on the middle. Metanotum ( Figs. 1 View FIGURE 1 D, 2A) 1.2 times as wide as long (length 4.1 mm, width 5.0 mm), distinctly concave in the posterior, with five setae on the middle lateral part, and two median sutures on the anterior part.

Cervical sclerites ( Fig. 1 View FIGURE 1 J) 1.6 times as long as wide (length 2.3 mm, width 1.4 mm), symmetrical, with nine setae on the lateral margin of left (11 on right), and four small setae on the posterior of right part and five on the left. Basisternum of prothoracic segment 1.1 times as long as wide (length 2.0 mm, width 1.8 mm), symmetrical, triangular expanded on the anterior part, with two long median sutures, with some scattered hairs on the anterior. Katepisterna of prothorax distinctly situated between trochantin and cervical sclerite. Trochantin of prothorax (length 0.86 mm) crescent-shaped, symmetrical, with two setae on the distal part. Basisternum of mesothorax ( Fig. 1 View FIGURE 1 K) 1.5 times as wide as long (length 1.8 mm, width 2.7 mm), symmetrical, many scattered setae on anterior part, with two median sutures on the middle originated in the posterior part with distinctly big sternal apophyses. Katepisterna of mesothorax symmetrical, composed in two parts jointed on the lateral margin (upper part length 1.8 mm, width 0.6 mm, with ten setae on the middle and anterior parts; lower part length 1.5 mm, width 0.9 mm, diamond shaped, with two median sutures and one seta on the mid-lateral part). Trochantin of mesothorax circle, with distinct big sternal apophysis and situated between coax of 2nd leg. Basisternum of metathorax ( Fig. 1 View FIGURE 1 L) 2.1 times as wide as long (length 1.4 mm, width 3.0 mm), many scattered setae on its anterior part, with two short median suture on the posterior. Katepisterna of metathorax symmetrical, composed in two parts jointed on the lateral margin part (upper part length 1.8 mm, width 0.9 mm, long rectangular, many scattered setae; lower part length 1.4 mm, width 0.8 mm, diamond shaped, with two median sutures. Trochantin of mesothorax circle, with two sternal apophyses and situated between coax of the 2nd legs.

Legs ( Table 1 View TABLE 1 ) elongated, leg formula 321, with each two setae on all trochanter, two large spines on the ventral end of the tibia, developed white pulvilli, two setae each on the apical of the 2nd and 4th tarsi, many strongly long hairs on all tarsi, and two strong tarsal claws without teeth; 1st leg 21.8 mm, femur ratio 3.0, some scattered setae on coax, trochanter smaller than others, 25 setae (nine on the dorsal, 16 on the ventral) on femur, ten setae in tibia, 12 in tarsi (six on the1st tarsus, two each on the 2nd and 3rd); 2nd leg 23.1 mm, femur ratio 4.2, some setae scattered on coxa, three rows composed of 18 setae (ten on the dorsal, two on the prolateral, six on the ventral) on femur, 20 setae on tibia, 12 on tarsi (six in the 1st tarsus, two each in the 2nd and 3rd); 3rd leg 29.7 mm, femur ratio 4.7, many scattered setae on coax, three rows composed of 29 setae (seven on the dorsal, four on the prolateral, 20 on the ventral) on femur, 26 setae (12 on the dorsal, five on the prolateral, nine on the ventral) on tibia, 12 on tarsi (six on the 1st tarsus, two each on the 2nd and 3rd).

Abdominal tergites ( Figs. 1 View FIGURE 1 F, 2E) slightly convex in the middle, symmetrical, with lateral margin flexed to the posterior, ten-segmented, a pair of median suture on the lateral of 1st segment to 6th, supra-anal plate of 10th segment with truncate projection, one pair of seta on the middle lateral side of 2nd to 8th, eight setae on the posterior of the 1st, and the 3rd to 8th, six on the 2nd and 9th, four on the 10th; 1st tergite 2.8 times as wide as long (length 1.6 mm, width 4.5 mm), 2nd three times as wide as long (length 1.6 mm, width 4.8 mm), 3rd 2.8 times as wide as long (length 1.7 mm, width 4.8 mm), 4th 2.5 times as wide as long (length 2.0 mm, width 5.0 mm), 5th 2.6 times as wide as long (length 1.9 mm, width 4.9 mm), 6th 2.5 times as wide as long (length 1.9 mm, width 4.7 mm), 7th 2.7 times as wide as long (length 1.6 mm, width 4.3 mm), 8th 2.6 times as wide as long (length 1.4 mm, width 3.6 mm), 9th 2.1 times as wide as long (length 1.4 mm, width 2.9 mm), 10th 1.5 times as wide as long (length 1.6 mm, width 2.4 mm).

Abdominal sternites ( Figs. 1 View FIGURE 1 G, 2C) slightly convex, symmetrical, with the lateral margin flexed to the posterior part, distinct eversible sac on the mid-posterior margin of the 1st sternite, two rows (one row composed of eight to twelve setae on the middle part, another composed of 14 to 18 on the posterior margin) on the 3rd to 7th sternite; 1st sternite two times as wide as long (length 1.3 mm, width 2.6 mm), 2nd about two times as wide as long (length 1.7 mm, width 3.4 mm) with four on the middle and five on the posterior margin, 3rd 1.9 times as wide as long (length 1.9 mm, width 3.7 mm) with 18 setae on the middle and nine on posterior margin, 4th 2.1 times as wide as long (length 2.0 mm, width 4.1 mm) with 15 setae on the middle and 11 on the posterior margin, 5th about two times wider than length (length 2.1 mm, width 4.1 mm) with 15 setae on the middle and nine on the posterior margin, 6th 1.8 times as wide as long (length 2.2 mm, width 4.0 mm) with 14 setae on the middle and seven on the posterior margin, 7th about two times as wide as long (length 1.9 mm, width 3.7 mm) with 15 setae on the middle and eight on the posterior margin, 8th 2.4 times as wide as long (length 1.3 mm, width 3.1 mm) with seven setae on the middle and four on the posterior margin.

Ninth abdominal segment ( Figs. 1 View FIGURE 1 E, 2D) indistinctly separated from 9th abdominal sternite, slightly projected in the middle and with many scattered hairs. Styli twosegmented, with strongly asymmetrical coax, left (length 1.3 mm, width 1.5 mm) about 1.5 times as wide as right (length 1.9 mm, width 1.0 mm) wrapped round process on the mid-prolateral part; distal segment of styli, length about 4.5 times as long as wide (length 0.9 mm, width 0.2 mm), cylindrical, symmetrical, two setae each on the middle and distal parts.

Cercomeres ( Figs. 1 View FIGURE 1 H–I, 2D–E) 12-segmented, some broken on the last segment, symmetrical, cylindrical, with ring patterns of trichobothria (sound sensory organ) and setae on the distal part of segments except for the terminal segment, and the 1st cercomere without seta; 1st cercomere (length 0.3 mm) with one ring pattern composed of 15 trichobthria; 2nd cercomere (length 0.3 mm) shorter than others, with three setae (1d, 2v), one ring pattern composed of seven trichobothria; 3rd cercomere (length 0.3 mm), with one ring pattern composed of five setae (2p, 1r, 2v), one ring pattern composed of nine trichobothria; 4th cercomere (length 0.6 mm), with eight setae (0-2d, 0-3p, 0-2r, 0- 1 v), one ring pattern composed of four trichobothria; 5th cercomere (length 0.7 mm), with eight spines (0-2d, 0-2p, 0-3r, 0- 1 v), one ring pattern composed of six trichobothria; 6th cercomere (length 0.9 mm), with eight setae (0-2d, 0-2p, 0-2r, 0- 2 v), one ring pattern composed of five trichobothria; 7th cercomere (length 1.1 mm), with eight setae (0-2d, 0- 2r, 0-2r, 0- 2 v), one ring pattern composed of six trichobothria; 8th cercomere (length 1.3 mm), with seven setae (0-2d, 0-3p, 0-1r, 0- 1 v), one ring pattern composed of six trichobothria; 9th cercomere (length 1.4 mm), with five setae (0-1d, 0-2p, 0-1r, 0- 1 v), one ring pattern composed of five trichobothria; 10th cercomere (length 1.5 mm), with four setae (0-1d, 0-2p, 0-1r, 0- 1 v), with six trichobothria; 11th cercomere (length 1.4 mm), three setae (0-0-1d, 0-0- 2 v), three trichobothria; 12th cercomere broken in about one thirds.

Genital organ ( Figs. 1 View FIGURE 1 M–O, 2F) situated between the ventral parts of the 9th and the 10th segment, strong asymmetrical, eversible sac of phallomere, 2.5 times as long as wide (length 2.0 mm, width 0.8 mm), wrinkled cylindrical shape, wound to the upper left cercus and originating from the lateral base of the left phallomere; left phallomere slightly as long as wide (length 1.0 mm, width 0.9 mm), L-shaped with broad base, situated in between eversible sac of phallomere and principle copulatory sclerite and many scattered hairs; right phallomere situated between left phallomere and right stylus coax, semicircular, with round distal part; accessory copulatory sclerite composed of three parts (1st part reverse λshaped, 2nd reverse L-shaped, 3rd elongated oval-shaped situated in between eversible sac of phallomere and the ventral of the 10th abdominal segment); principal copulatory sclerite composed of two parts (higher and lower with respect to genital opening) surrounded by left phallomere and the 1st accessory copulatory sclerite (higher part, with semicircular expanded process, largely depressed in the right; lower part, triangularly concave process in the top); genital opening situated in the middle part of principal copulatory sclerite.