Coecobrya tukmeas, Zhang & Deharveng & Chen, 2009

Zhang, Feng, Deharveng, Louis & Chen, Jian-Xiu, 2009, New species and rediagnosis of Coecobrya (Collembola: Entomobryidae), with a key to the species of the genus, Journal of Natural History 43 (41 - 42), pp. 2597-2615 : 2602-2604

publication ID	https://doi.org/ 10.1080/00222930903243970
persistent identifier	https://treatment.plazi.org/id/D07E8798-FFC5-3F4E-8CC7-FE03A72EFEB6
treatment provided by	Felipe
scientific name	Coecobrya tukmeas
status	sp. nov.

Treatment

Coecobrya tukmeas View in CoL sp. nov.

( Figure 2 View Figure 2 )

Types

Holotype. Female on slide, Cambodia, Kampot, Tuk Meas, cave on Phnom Teng Ngai , on wood debris, 22 November 2005, Berlese extraction, Deharveng leg (sample KAM05–33 ) . Paratypes. Same sample: four females and one male on slide and seven in alcohol; ibid, by hand (sample KAM05–32 ): two specimens in alcohol . Holotype, three paratypes on slide and six paratypes in alcohol in MNHN; two paratypes on slide and three paratypes in alcohol in NJU .

Description

Body length up to 1.5 mm. Ground colour pale light orange to whitish in alcohol.

Antenna about 1.75 times as long as cephalic diagonal (from tip of mouth to posterior margin). Antennal segments as I: II: III: IV = 1: 1.25–1.40: 1.25–1.30: 2.38–2.40, with Ant. IV slightly less than twice as long as Ant. III. Ant. I with at least five long, smooth straight chaetae and three dorsal and three ventral smooth spinelike microchaetae at base. Ant. III organ not clearly seen.

Eyes 1 + 1. Lateral process of labial palp straight, as thick as normal chaetae, with tip reaching beyond apex of labial papilla ( Figure 2A View Figure 2 ). Subapical chaeta of maxillary outer lobe straight, subequal to the apical one; three smooth sublobal hairs on maxillary outer lobe ( Figure 2B View Figure 2 ). Chaetae of labial base as M 1, R, E, L 1, L 2, all smooth; R and X 4 as microchaetae; chaeta X smooth; X 2 and X 3 absent ( Figure 2C View Figure 2 ). Cephalic dorsal chaetotaxy with five sutural chaetae and four (sometimes three) macrochaetae in Gr. II ( Figure 2D View Figure 2 ).

Dorsal macrochaetae shown in Figure 2E View Figure 2 . Th. II with three (m1, m2, m2i) mediomedian, two medio-lateral (m4, m4p), 18–20 posterior macrochaetae and three lateral Schaetae. Th. III with 24–25 macrochaetae and two S-chaetae; m7 and m6p as mesochaetae.

Trochanteral organ with 11–14 smooth spiny chaetae; seven to nine in the arms of “L” and three to five between them ( Figure 2F View Figure 2 ). Inner differentiated tibiotarsal chaetae “smooth” with ciliations closely appressed to axis, the most distal one smooth on hind tibiotarsus; inner outstanding macrochaetae located at about one-third of distance from base, ciliate and tapered ( Figure 2G View Figure 2 ). Unguis with one inner distal tooth and a pair of basal unequal teeth, the outer one larger. Unguiculus with outer edge serrate (three or four teeth). Tenent hair pointed, subequal to unguiculus ( Figure 2H View Figure 2 ).

Abd. IV 2.5 times as long as Abd. III along dorsal midline. Abd. I with four macrochaetae centrally (m2–4, m4p) and two S-chaetae laterally. Abd. II with three central (a2, m3, m3e), one lateral (m5) macrochaetae and two S-chaetae. Abd. III with one central (m3), three lateral (amp, pm6, p6) macrochaetae and two S-chaetae ( Figure 2I View Figure 2 ). Abd. IV with six central (A3, A6, C1, B4–6), six lateral macrochaetae and about 12 S-chaetae on each side ( Figure 2J View Figure 2 ). Abd. V with about 32 chaetae and three S-chaetae on each side; macrochaetae m2, m3 and m5 always much larger than others ( Figure 2K View Figure 2 ). Tenaculum with 4 + 4 teeth and one large striate chaeta ( Figure 2L View Figure 2 ). Ventral tube anteriorly with five or six ciliate chaetae on each side ( Figure 2M View Figure 2 ); posteriorly with six smooth chaetae; each lateral flap with eight smooth chaetae ( Figure. 2N View Figure 2 ). Manubrium with 3 + 3 dorsal smooth chaetae; 1 + 1 on base of dens ( Figure 2O View Figure 2 ). Manubrial plaque with two pseudopores and two ciliate chaetae ( Figure 2P View Figure 2 ). Distal smooth part of dens 1.2–1.5 as long as mucro. Mucro falcate and basal spine long, its tip reaching the tip of apical tooth ( Figure 2Q View Figure 2 ).

Etymology

Named after type locality.

Ecology

In large population on wood debris, in the dark zone of a narrow and warm semiartificial cave developed at low altitude in a small hill. No obvious morphological modification in relation to cave life is observed in C. tukmeas , but the species has not yet been collected in forest soils of the region.

Remarks

This species is characterized by 1 + 1 eyes, microchaetae R and X 4 on labium, “smooth” inner differentiated tibiotarsal chaetae, serrate outer edge on unguiculus, absence of m4i and presence of p4 and p4i on Th. II, presence of macrochaetae m5i, a6i and m6e on Th. III, absence of the third small S-chaeta on Abd. III, and complete set of chaetae on Abd. V. As the third species with 1 + 1 eyes in the genus, C. tukmeas sp. nov. is closest to Coecobrya indonesiensis Chen and Deharveng, 1997 , and differs from the latter in the presence of microchaetae R and X 4 on ventral side of the head and m5i on Th. II, the absence of m2i, a3, a5 on Abd. I, m3ep on Abd. II, A4 on Abd. IV.