Sinella longiantenna, Zhang & Deharveng, 2011

Zhang, Feng & Deharveng, Louis, 2011, Cave Sinella (Collembola: Entomobryidae) from China, Journal of Natural History 45 (19 - 20), pp. 1213-1231 : 1221-1224

publication ID	https://doi.org/ 10.1080/00222933.2011.552805
persistent identifier	https://treatment.plazi.org/id/1B58D74C-FFFC-F119-5556-2E60FC88A500
treatment provided by	Carolina
scientific name	Sinella longiantenna
status	sp. nov.

Treatment

Sinella longiantenna sp. nov.

( Figures 3–4 View Figure 3 View Figure 4 )

Types

Holotype. Female on slide, China, Sichuan, Han He Ba, Xia Shi Dong (cave), 6 August 2004, coll. J. Lips (Lips-1519) . Paratypes. Two females on slide and one in alcohol, same data as holotype. Other records. Four females on slide and three in alcohol, China, Sichuan, Han He Ba , San Yan Dong (cave), 29 July 2004, coll. J. Lips (Lips-1404); female on slide, China, Sichuan, Han He Ba, San Yan Dong (cave), 29 July 2004, coll. J. Lips (Lips-1422); female on slide, China, Sichuan, Han He Ba, Gan Chuan Dong (cave), 6 August 1999, coll. J. Lips (Lips-424) . Holotype and one paratype deposited in alcohol in NJU and others in MNHN .

Description

Body length up to 5 mm. Body white.

Antenna 5.2–6.1 times as long as cephalic diagonal, obviously longer than body. Antennal segments ratio as I: II: III: IV = 1: 1.7–2.4: 2.0–2.8: 5.0–6.7 ( Figure 3A View Figure 3 ). Long smooth straight chaetae about six on Ant. I and four on Ant. II. Paddlelike chaetae 3–5 dorso-internal on distal Ant. I ( Figure 3B View Figure 3 ), 4–5 dorso-external on Ant. II ( Figure 3C View Figure 3 ), and at least 10 internal on Ant. III. Types 1, 3, 4, 6 of antennal chaetae described for S. lipsae also present but their number difficult to check. Ant. III organ with chaetae 2 and 3 paddle-like, chaeta 5 obviously shorter than 2, chaeta 9 much longer than others ( Figure 3D View Figure 3 ). Ant. IV without apical bulb and with a small subapical organite ( Figure 3E View Figure 3 ) .

Eyes absent. Lateral process of labial palp straight, as thick as normal chaetae, with tip not reaching apex of labial papilla ( Figure 3F View Figure 3 ). Subapical chaeta of maxillary outer lobe large subequal to apical one; three smooth sublobal hairs on maxillary outer lobe. Labial chaetae as MREL 1 L 2, all smooth; R 0.6–0.7 length of chaeta M; chaetae X and X 2–4 smooth; more additional chaetae present among them ( Figure 3G View Figure 3 ). Dorsal cephalic chaetotaxy with six sutural (S) and 5–6 macrochaetae in Gr. II ( Figure 3H View Figure 3 ).

Th. II ( Figure 3I View Figure 3 ) with 4–7 (usually six) medio-medial, four (m4, m4i, m4p, m4pi) medio-lateral, 23–28 posterior macrochaetae and three s-chaetae. Th. III ( Figure 3J View Figure 3 ) with 33–38 macrochaetae and two s-chaetae; p3p and a5e sometimes absent; chaeta p4 as macrochaeta.

Trochanteral organ with 27–44 smooth spiny chaetae ( Figure 3K View Figure 3 ). Inner differentiated tibiotarsal chaetae “smooth” with ciliations closely appressed to axis ( Figure 3L View Figure 3 ); inner outstanding macrochaetae located at about 0.33 distance from base, ciliate and tapered at tip ( Figure 3M View Figure 3 ). Unguis slender with two tiny inner paired teeth at 1 / 6 distance from base. Unguiculus truncate, its outer edge with a tiny tooth at base. Tenent hairs pointed, much shorter than unguiculus ( Figure 3N View Figure 3 ).

Abd. IV 5.8–7.8 times as Abd. III in length along dorsal midline. Abd. I with 12 central macrochaetae and two s-chaetae; a5i and m4p sometimes absent ( Figure 4A View Figure 4 ). Abd. II with five central, one lateral (m5) macrochaetae and two s-chaetae; m 3ei present ( Figure 4B View Figure 4 ). Abd. III with one (m3) central, three (am6, pm6, p6) lateral macrochaetae and three s-chaetae ( Figure 4C View Figure 4 ). Abd. IV with 10–13 central, about 17 lateral macrochaetae and at least 40 s-chaetae ( Figure 4D View Figure 4 ). Abd. V with 22 macro- or mesochaetae and 5 s-chaetae ( Figure 4E View Figure 4 ). Tenaculum with 4 + 4 teeth and one large striate chaeta. Ventral tube anteriorly with 14–21 ciliate chaetae ( Figure 4F View Figure 4 ); posteriorly with 8–13 smooth chaetae and numerous ciliate chaetae; each lateral flap with seven smooth and seven ciliate chaetae ( Figure 4G View Figure 4 ). Manubrial plaque with two pseudopores and 17–24 ciliate chaetae ( Figure 4H View Figure 4 ). Distal smooth part of dens about 0.8 times length of mucro. Mucro bidentate and slender with basal spine long, its tip just reaching apex of subapical tooth ( Figure 4I View Figure 4 ).

Ecology

Troglobiont, only found in cave habitats.

Etymology

Named after antenna length, the longest known in the genus.

Remarks

This new cave species can be distinguished from other Sinella by long antennae, paddle-like chaetae on Ant. I–III, elongate unguis with two tiny paired inner teeth, short tenent hair, more abundant macrochaetae and s-chaetae on dorsal body, and numerous chaetae on posterior face of ventral tube and manubrium plaque. The presence of five s-chaetae on Abd. V is observed for the first time in Entomobryidae and the antennae are the longest known in Sinella . The enormous body of this new species may partly explain more chaetae and more s-chaetae. Another undescribed Sinella species of similar size, but with shorter antennae is cited from a cave in Hong Lin (Guizhou: Qianxi County) by Deharveng & Chen (2008).