Sinella maolanensis, Wu & Huang & Luan, 2018

Wu, Jun, Huang, Cheng-Wang & Luan, Yun-Xia, 2018, A new species and a new record of Sinella Brook (Collembola: Entomobryidae) from Guizhou Province, China, Zootaxa 4444 (4), pp. 484-490 : 485

Sinella maolanensis sp. nov.

Figs 1‒16 , Table 1

Types. Holotype: female on slide, China: Guizhou Province: Libo: Maolan , 25°16’ N 107°54’ E, altitude 780 m, 22.vii.2015, C-W Huang, Y Liang and A-M Liu leg., slide number M001 . Paratypes: two females and one male on slides, data same as holotype .

Description. Body length up to 1.70 mm. Body whitish in alcohol.

Antenna 2.01‒2.30 times as long as cephalic diagonal. Antennal segment ratio as I: II: III: IV = 1: 1.46‒1.66: 1.36‒1.52: 2.25‒2.52. Smooth spiny mic at base of antennae three dorsal, three ventral on Ant. I, one internal, one external and two ventral on Ant. II. Ant. II distally with two swollen dorsal S-chaetae. Two internal S-chaetae of Ant. III organ paddle-like ( Fig. 1 ). Ant. IV with a knobbed subapical organ. Long smooth straight chaetae at least three on ventral side of Ant. II. Distal pseudopores 1, 1, 2 ventrally on Ant I‒III, respectively.

Eyes absent. Prelabral and labral chaetae 4/ 5, 5, 4, all smooth; labral intrusion U-curved ( Fig. 2 ). Clypeus with three prefrontal and five facial chaetae; three facial ones ciliate and small ( Fig. 3 ). Dorsal cephalic chaetotaxy with four antennal, three median (M) and eight sutural (S) mac; Gr. II with 4(5) mac ( Fig. 4 ). Mandibles with 4+5 (four left, five right) large apical teeth. Subapical chaeta of maxillary outer lobe larger than apical one; three smooth sublobal hairs on maxillary outer lobe. Lateral process of labial palp thicker than normal chaetae, with tip beyond apex of labial papilla ( Fig. 5 ). Labial chaetae as mrel1l2, all smooth, r/m=0.60‒0.67; chaetae X, X2 and X4 ciliate; chaeta X3 smooth. Cephalic groove with nine chaetae, four of them smooth and others ciliate ( Fig. 6 ).

Trochanteral organ with 12‒15 (14‒15 in holotype) smooth spiny-like chaetae; 8‒11 in arms and 4‒5 between them ( Fig. 7 ). Partial inner differentiated tibiotarsal chaetae “smooth” with ciliations moderately appressed to axis. Tibiotarsi distally with 10 chaetae in a whorl. Unguis with three inner, one outer and two lateral teeth; two paired teeth unequal, outer one large. Unguiculus outer edge with a large tooth. Tenent hairs pointed or clavate ( Fig. 8 ). Abd. IV 3.25‒3.55 longer than Abd. III along dorsal midline. Ventral tube anteriorly with 6+6 ciliate chaetae; two of them much larger than others; posteriorly with about 6+6 smooth chaetae; each lateral flap with seven smooth and one weakly ciliate chaetae ( Fig. 9 ). Furcula without smooth chaetae. Manubrium ventrally with 6‒8 distal ciliate chaetae on each side ( Fig. 10 ). Manubrial plaque with 1‒2 pseudopores and 4+4 ciliate chaetae ( Fig. 11 ). Distal smooth part of dens 1.35‒1.52 as long as mucro. Mucro bidentate with a long basal spine and its tip nearly reaching the apical tooth ( Fig. 12 ).

Th. II with three (m1, m2, m 2i) medio-medial, three (m4, m 4i, m4p) medio-sublateral and about 24 posterior mac. Th. III with 30 mac; m 5i, a 6i, p5, p6, m6, m 6i and m6e as mac ( Fig. 13 ). Abd. I with six (a3, m2‒4, m 2i, m4p) mac. Abd. II with three (m3, m3e, m3ep) central and one (m5) lateral mac. Abd. III with one (m3) central and three (am6, pm6, p6) lateral mac ( Fig. 14 ). Abd. IV with six central (I, M, A5‒6, B4‒5) and five lateral mac (E2‒4, E2p, F1) ( Fig. 15 ). Abd. V with chaetae m2, m3, m5, p1 and p3 much larger than others ( Fig. 16 ). S-chaetae formula: 2+ms, 2/1+ms, 2, 2,?, 3.

Ecology. Under a cluster of bamboos in broad-leaved forest.

Etymology. Named after the type locality.

Remarks. Sinella maolanensis sp. nov. is characterized by the postlabial chaetae X, X2 and X4 ciliate and X3 smooth combined to 6+6 central mac on Abd. IV. It is most similar to Sinella sineocula Chen & Christiansen, 1993 , Sinella yunnanica Zhang & Deharveng, 2011 and Sinella liuae Zhao & Zhang, 2016 in “smooth” inner differentiated tibiotarsal chaetae, long mucronal spine, lateral process of labial palp, number of teeth on unguis and unguiculus, dorsal mac on head, chaetotaxy of thorax and Abd. II‒III. It differs from S. sineocula in smooth postlabial chaetae X3 and 6 +6 central plus 5+5 lateral mac on Abd. IV, from S. yunanica in postlabial chaetae X, X2 and X4 ciliate and X3 smooth, presence of mac m 5i on Th. III, absence of ms on Abd. III and 6+6 central mac on Abd. IV, and from S. liuae in the relative position of inner ungual teeth, number of chaetae on posterior face of ventral tube, 6+6 mac on Abd. I and 5+5 lateral mac on Abd. IV ( Table 1).

Figures

FIGURES 1‒12. Sinella maolanensis sp. nov. 1, Ant. III organ; 2, labrum; 3, clypeal chaetae; 4, dorsal cephalic chaetotaxy; 5, lateral process of labial palp; 6, labial and postlabial chaetae; 7, trochanteral organ; 8, hind claw; 9, ventral tube; 10, distal part of manubrium ventrally; 11, manubrial plaque; 12, mucro.

FIGURES 13‒16. Tergal chaetotaxy in Sinella maolanensis sp. nov. 13, thorax; 14, Abd. I‒III; 15, Abd. IV; 16, Abd. V.