Koreanurina weinerae, Wu & Bedos & Deharveng, 2014

Wu, Donghui, Bedos, Anne & Deharveng, Louis, 2014, First record of the genus Koreanurina Najt and Weiner (Collembola: Neanuridae: Pseudachorutinae) from China, with description of two new species from Changbai mountain, Journal of Natural History 48 (41 - 42), pp. 2579-2593 : 2582-2587

Koreanurina weinerae sp. nov.

( Figures 2–5 ; Table 1)

Type material

Holotype female and three paratypes (one male, two females). China: Jilin Province, Changbai county, Changbai Mountain ( GPS coordinates: 41°45 ′ 19 ″ N, 127°56 ′ 29 ″ E, altitude 1724 m), in coniferous forest, Berlese funnel extraction, 28 July to 3 August 2009, Donghui Wu leg. (sample CHI-Wu14). Five paratypes (one male, three females, one juvenile): ibid, 1–5 October 2009 (sample CHI-Wu07).

Holotype (CHI-Wu14), and five paratypes (CHI-Wu07) on slides in NEIGAE- CAS; three paratypes (one male, two females, CHI-Wu14) on slides in MNHN.

Species name derivation

The species is named in honour of Professor Wanda Maria Weiner, for her essential contribution together with Judith Najt to the knowledge of Far-East Palearctic Collembola.

Description

Body appearance. Length: 0.70 mm (holotype female); 0.65–0.85 mm (paratypes). Habitus stout, ovoid, similar to other Koreanurina , 2.1–2.3 times as long as wide ( Figure 2 ). Body colour in alcohol spotted blue. Ocular patch reduced, not well delimited, blue-black, with a number of ocelli uncertain, as they have the size of secondary granules (3 + 3 or possibly more). Th I with its 2 + 2 dorsolateral chaetae included in the posterior plates of the head, and its 1 + 1 dorsointernal chaetae in a small granulated area not fused with head (in one specimen, a single asymmetrical chaeta, Figure 4 ).

Dorsal ornamentation. Dorsally, integument covered with very strong, rounded secondary granulations, underlined by extensive reticulations, from head to Abd V; secondary granules in groups of 1–3, each group underlined by a well-marked mesh of polygonal reticulation. Groups of granules arranged in large tertiary plates covering most of the head and tergites ( Figures 2 , 4 ); three such plates on head (one central and two posterior separated by a narrow axial stripe devoid of reticulation; ocular plates not clearly individualized); 1 + 1 on each tergite from Th I to Abd IV, separated by a narrow stripe devoid of reticulations; and one uneven on Abd V, strongly V-inverted into Abd IV. Abd VI small, devoid of well-marked reticulations. Secondary granules outside plates smaller except laterally where they can be very large. The narrow axial stripe devoid of reticulations that runs from posterior part of head to Abd IV is constituted of two parallel lines of small secondary granules.

Antennae ( Figure 3A–B ). Antennae shorter than head ( Figure 2 ). Ant I with 7 chaetae, Ant II with 12 chaetae. Ant III and Ant IV fused dorsally. Sensory organ on Ant III consisting of two small bent S-microchaetae, two long subcylindrical guard S-chaetae and a small ventral S-microchaeta. Ant IV with 6 thick subcylindrical S-chaetae shorter than the guards of Ant III, an external S-microchaeta, a subapical organite and a distinctly trilobed apical bulb.

Head. PAO oval-rounded with 9–16 vesicles (N = 7; Figure 3C ), located on the lateral edge of the head ( Figure 4 ). Buccal cone short and truncated, typical for the genus. Mandible ( Figure 3D ) with three strong teeth (two basal, one apical), and two subapical ones, smaller. Maxilla ( Figure 3D ) with three lamellae: one external (with more than 10 minute teeth, the 2–3 apical ones larger), two internal (one short with two teeth, the other one long and styliform). Labrum short, truncated, with 2/2,3,5,2 chaetae. Labium ( Figure 3E ) short, with 4 basal (E, F, G, f), 3 distal (A or B, C, D) and 3 (c, d, e) or possibly 4 lateral chaetae; papillated chaetae L absent; 2 + 2 large hyaline vesicles arranged one above the other between chaetae A and C (X papillae of Deharveng 1983).

Dorsal chaetotaxy ( Figure 4 ). Dorsal clothing of short, thin, pointed, smooth ordinary microchaetae, no longer than two times the diameter of secondary surrounding granules, and long thin S-chaetae, 4–5 times longer than ordinary chaetae. Head without uneven chaeta a0 (N = 8). Central plate of head with most chaetae shifted laterally to the edge of the plate, and 3 + 3 chaetae within it (arbitrarily noted a, b, c in Figure 4 ), with chaeta b posterior to chaeta a, distance between chaetae a about the same as distance between chaetae b, and chaetae a anterior to the c-line (N = 8); frequent asymmetries. Thorax I weakly separated from head, with only 1 + 1 minute dorsointernal chaetae. Dorsolateral chaetae of Th II and Th III in one group (S and two ordinary chaetae, probably a6 and p6). S-chaetae formula per half-tergite: 0,2 + ms,2/ 1,1,1,1,1; S-microchaeta close and anterior to the lateral S-chaeta; S-chaetae of Abd IV slightly thicker and shorter than others. Th II–III with 2 chaetae in the p-row between axis and internal S-chaeta (N = 6). Abd I–III with (2)–3 chaetae in the p-row between axis and S-chaeta (N = 6). Abd V anterior edge V-inverted, with a1 chaetae well anterior to the line of the S-chaetae and p1 well posterior to this line (N = 7), with frequent asymmetries in a1 position. Abd VI very reduced, hidden under Abd V in specimens examined in alcohol, most of its chaetae only visible ventrally.

Ventral chaetotaxy and appendages. Thoracic sternites without chaetae. Tibiotarsi ( Figure 5A ) with 19, 19 and 18 chaetae (M present); ventral chaetae B4 and B5 short, not reaching the claw basis; 1 + 1 pretarsal chaetae, unusually long; claw short and thick, toothless. Ventral tube with 4 + 4 chaetae, without chaetae at basis. Ventral chaetotaxy of abdomen as in Figure 5B–C . Furca reduced to two small round swellings anteriorly on Abd IV sternite, each with one short chaeta; 2 + 2 chaetae posterior to furcal rest and closest large chaetae (N = 7). Anal valves of the male each with 5 modified chaetae, thickened and ciliated, similar to those of K. alba sp. nov.

Discussion

K. weinerae sp. nov. is similar to K. inexspectata in most morphological features. The two species can be separated by their size, the number of chaetae on Ant II, the width of the central reticulate area on head, the position of the PAO, the number of dorsal chaetae on Th I and the position of aI chaetae on Abd V, as detailed in Table 1. K . weinerae sp. nov. shares also important characteristics with Caputanurina intermedia Najt and Weiner, 1992 : habitus, extent of reticulations and several chaetotaxic characters, particularly on the central area of head and the plate of Abd V. The new species has however a complete tibiotarsal chaetotaxy (19, 19, 18 chaetae versus 18, 18, 17 in C. intermedia ) and a first thoracic segment with 1 + 1 versus no dorsointernal chaetae ( Table 1).

Figures

Figure 2. Koreanurina weinerae sp. nov., habitus (microscopic image, specimen body length 0.7 mm).

Figure 3. Koreanurina weinerae sp. nov. (A) left antenna in dorsal view; (B) antennal segments III–IV of left antenna in ventral view; (C) PAO; (D) maxilla (left) and mandible (right); (E) labium.

Figure 4. Koreanurina weinerae sp. nov. Dorsal chaetotaxy. A single asymmetrical dorsointernal chaeta is present on Th I in this specimen. Specimen body length 0.81 mm.

Figure 5. Koreanurina weinerae sp. nov. (A) tibiotarsus of leg I; (B) ventral chaetotaxy of abdomen in a female; (C) ventral chaetotaxy of abdomen VI in a female.