Lobellina gladius, Hu & Jiang & Jiang, 2019

Hu, Ya-Hui, Jiang, Cheng & Jiang, Ji-Gang, 2019, Two new species of Lobellini from Central-South China (Collembola Neanuridae), Zootaxa 4712 (1), pp. 77-89 : 83-88

Lobellina gladius sp. nov.

Figures 2, 4 , 6 , 10–14 , 16 , 18, 20 , Tables 4–5

Type material. Holotype: male, China, Hunan, Xinning county , Langshan National Geopark. Coordinates: 26.273767N, 110.732951E, alt. 770m, in forest of bamboo, leg. Ji-Gang Jiang, Cheng Jiang, Li-Ping Duan, 29.iv.2018 . Paratypes: 5 females and 2 juveniles, about 30 specimens in alcohol, the same data as holotype, collection number as J2018042904. One female, subadult, and 4 juvenile, Guangxi , Ziyuan county, Langshan National Geopark. Coordinates: 26.274416N, 110.732011E, alt. 685m, in forest of bamboo, leg. Ji-Gang Jiang, Cheng Jiang, Li-Ping Duan, 29.iv.2018 (J2018042903). Female and male, Guangxi , Ziyuan county, Langshan National Geopark. Coordinates: 26.276824N, 110.730528E, alt. 510m, nearby the entrance of the Park, leg. Ji-Gang Jiang, Cheng Jiang, Li-Ping Duan, 29.iv.2018 (J2018042901). One male, Hunan , Xinning county, Shunhuangshang National Nature Reserve, Coordinates : 26.450028N, 111.014716E, alt. 930m, in forest, leg. Ji-Gang Jiang, Cheng Jiang, Li-Ping Duan, 1.v.2018 (J2018050102). Type materials are housed in the Key Laboratory of Zoology , Hunan University of Arts and Science ( HUAS), Changde, Hunan Province, China .

Diagnosis. Three pigmented eyes on head, mandible with six teeth, cephalic chaeta O present and including in tubercle Fr, cephalic tubercle Di not fused, non-cross type chaetotaxy on posterior area of head, cephalic lateral tubercle Dl, L and So independent respectively, Ant. I with 9 chaetae, Th. I with 4+4 tubercles, VT with 6–8 (usually 7) chaetae.

Description. Body length: holotype, male, 4.0 mm. Usually, males: 4.0– 4.4 mm, females: 3.5–4.8 mm, juveniles: 1.5–3.5 mm.

Body color. Red while living ( Fig. 2 ) and white in alcohol ( Fig. 4 ).

Chaetal morphology ( Fig. 6 ). Dorsal ordinary chaetae of four types: Ml, Mc, Mcc and me. Macrochaetae Ml long, sheathed, smooth and with blunt tip, gladius shaped ( Fig. 6j ), some Ml not sheathed and with pointed tip, such as F chaetae on head ( Fig.6k ) and macrochaetae on Abd. VI ( Fig. 6l ). Macrochaetae Mc similar to Ml morphologically, but shorter ( Fig. 6 m–n). Macrochaetae Mcc morphologically similar to Mc and shorter than Mc ( Fig. 6o ). Mesochaetae similar to ventral chaetae, thin, smooth, and pointed, with various length ( Fig. 6 p–r, t). S-chaetae on terga thin, smooth, equal to Mc and longer than Mcc ( Fig. 6s ).

Head ( Table 4 , Fig. 10 ). Eyes 3+3, black ( Fig. 11 ). Antenna 4-segmented ( Fig. 16 ). Ant. I with 9 Chaetae. Ant. II with 9–11 Chaetae. Ant. III dorsally fused to Ant. IV. Two guard chaetae sgd and sgv present. Two short rods exposed in separate pit. Ant. IV dorsally with 8 thickened and curved sensilla, apical bulb trilobed. sensory organite (or) present. Ventral chaetotaxy of Ant. IV: ap with 7 bs and 3 miA, ca with 3 bs and 1 miA, cm with 2 bs and 2 miA, cp with 1 miA. On ventral side of Ant. III, Vi, Vc, Ve respectively with 3, 5, 4 chaetae.

Buccal cone weakly developed, labrum truncated, chaetal formula as 0/2, 2. Mandible with four apical teeth, one curved middle tooth and one basal tooth ( Fig. 12 ). Maxilla crochet form ( Fig. 13 ). Labium with 11 chaetae and no x ( Fig.18 ). Group Vi with 6+6 chaetae ( Fig.18 ). Groups Vea, Vem and Vep with 5, 2 and 2 chaetae respectively. Dorsal chaetotaxy of head as in Table 4 . and Fig. 10 . Dorsal central area with 6 separate tubercles: 1 tubercle Cl, 2 An, 1 Fr and 2 Oc. Dorsal posterior area with 4 separate tubercles: 2 Di and 2 De. Line of chaetae Di2–De2 not crosses line Di1– De1 on head (non-cross type, Deharveng, 1983). Dorsal lateral area with 3 separate tubercles: Dl, L and So.

Thorax ( Table 5 & Fig. 10 ). Th. I with 4+4 tubercles (Di, De, Dl and L). Th. II and Th. III with 4+4 tubercles respectively. Chaetotaxy of thorax and legs as in Table 2 . Unguis with a basal inner tooth, unguiculus absent. Chaeta M present on tibiotarsus.

Abdomen ( Table 5 & Fig. 10 ). Abd.I–IV respectively with 4+4 tubercles. Abd. V dorsally with 3+3 tubercles, two tubercles Di separate from each other, tubercle De separate from Dl, tubercle L present, on ventral side. Abd. VI with 1 tubercle on each side. VT with 7+7 chaetae, sometimes 6+6 or 8+8. Furcular remnant with 4 chaetae ( Fig. 20 ).

Etymology. The name of the species derives from the “ gladius ” shape of its macrochaetae.

Remarks. The new species can be separated from known species by the following characters: Th. I with 4+4 tubercles; tubercle Di with 3 chaetae on Abd. I–III respectively, VT with 6–8 chaetae (usually 7); non-crossed type chaetae on cephalic posterior area. Including the new species, sixteen species of genus Lobellina are known worldwide. Seven of them have O chaeta on cephalic tubercle Fr, of which, 4 with chaeta O free from the tubercle, and three species, i.e. L. nanjingensis , L.fusa and L. gladius sp. nov. with chaeta O included in tubercle Fr. The new species can be easily differentiated from the other two species of the last group by the following key.

Figures

FIGURE 10. Body dorsal tubercles and chaetotaxy of Lobellina gladius sp. nov.

FIGURES 11–14. Lobellina gladius sp. nov. 11 tubercle Oc and eyes, 12 mandible, 13 maxilla, 14 Ventral tube.

FIGURES 1–4. Body color: 1 body color of Crossodonthina langshanensis sp. nov. while alive. 2 body color of Lobellina gladius sp. nov. when alive. 3 body color of Crossodonthina langshanensis sp. nov. in alcohol. 4 body color of Lobellina gladius sp. nov. in alcohol.

FIGURES 5–6. Chaetae type: 5 chaetae type of Crossodonthina langshanensis sp. nov. a–b: Ml, c: Mc, d: Mcc, e–f: me, g: schaeta, h: mi, i: ms. 6 chaetae type of Lobellina gladius sp. nov. j–l: Ml, m–n: Mc, o: Mcc, p–r: me, s: s-chaeta, t: me.

FIGURES 15–16. Ant. I–IV: 15 Crossodonthina langshanensis sp. nov., 16 Lobellina gladius sp. nov.

FIGURES 17–20. Labium and ventral chaetotaxy of Abd. III–IV: 17 Labium of Crossodonthina langshanensis sp. nov., 18 Labium of Lobellina gladius sp. nov., 19 Crossodonthina langshanensis sp. nov., ventral chaetotaxy of Abd. III–IV, 20 Lobellina gladius sp. nov., ventral chaetotaxy of Abd. III–IV.

Tables

Table 4. Cephalic tubercles and chaetotaxy of Lobellina gladius sp. nov.

Tubercle	Number and type of chaetae	Names of chaetae
Cl	2 Ml 2 me	F G
An	1 Ml 1 Mc 1 Mcc or Mc 1 me or Mcc	B E C D
Fr	2 Mc 1 mcc or me	A O
Oc	1 Ml	Ocm
	2 Mc	Oca, Ocp
Di	1 Mc 1me	Di1 Di2
De	1 Mc 1 Mcc	De1 De2
Dl	1 Mc+1 Mcc+2 me	Uncertain
L	2 Mc	Uncertain
So	2 Ml+2 Mc+6 me	Uncertain

TABLE 5. Postcephalic tubercles and chaetotaxy of Lobellina gladius sp. nov.

Terga					Legs
	Di	De	Dl	L	Scx2 Cx	Tr	Fe
Th. I	Mc	Mc	Mc	Ml	0 3	6	13	19
Th. II Th. III Terga	2Mc+me 2Mc+me	2Mc+2me+s 2Mc+2me+s	2Mc+Mcc+s+ms 3Mc+s	Ml+Mc+me Ml+Mc+me	2 7 2 8 Sterna	6 6	12 11	19 18
Abd. I Abd. II	2Mc+me 2Mc+me	Mc+2me+s Mc+2me+s	2Mc 2Mc	Ml+Mc+me Ml+Mc+me	VT: 7(6–8) Ve: 4, V1: 0
Abd. III Abd. IV Abd. V	2Mc+me Mc+Mcc 2Mc+me	Mc+2me+s Mc+me+s s	2Mc 2Mc Ml+2Mc+Mcc	Ml+Mc+me 2Ml+2Mc+2me Mc+2Mcc+3me	Ve: 4, Fu: 4, 0 mi Vei:3, Vec: 3, Vel: 3, Vl:6 Ag:2, Vl: 2
Abd. VI	------------------- 4Ml+3me --------------------				Ve: 14, An: 3 mi