Coecobrya aokii (Yoshii, 1995)

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 : 2605-2607

publication ID	https://doi.org/ 10.1080/00222930903243970
persistent identifier	https://treatment.plazi.org/id/D07E8798-FFC8-3F48-8F13-FE6BA2FAF976
treatment provided by	Felipe
scientific name	Coecobrya aokii (Yoshii, 1995)
status

Treatment

Coecobrya aokii (Yoshii, 1995) View in CoL

( Figure 3 View Figure 3 )

Type locality

Vanuatu, Espiritu Santo, River Saranata [Saranata is probably a misspelling of Yoshii (1995) for Sarakata river] .

Material examined

Seven females and one male on slide and hundreds in alcohol, Vanuatu, Espiritu Santo , Malo island , Avorani , vegetal debris at the bottom of Vobananadi shaft, 15 September 2006, Berlese extraction, Vincent Prié leg (sample SK06–15/29); two females on slide, Vanuatu, Espiritu Santo island, Natawa, near Nanda Blue Hole, forest litter, 13 September 2006, Berlese extraction, Deharveng and Bedos leg (sample SK06–13/18). Deposited in MNHN, and 15 specimens from Malo in NJU .

Description

Body length up to 1.73 mm. Body white with minute scattered points of orange pigment.

Antenna 2.2 times as long as cephalic diagonal. Antennal segments ratio as I: II: III: IV = 1: 1.8: 1.7: 3.0. Antennal chaetae of six main types:

(1) ciliate, long or short; apically pointed ( Figure 3A View Figure 3 2 View Figure 2 and 3 View Figure 3 ) or blunt (few in Ant. I and II, Figure 3A View Figure 3 1 View Figure 1 );

(2) smooth straight chaetae; either long (at least five on Ant. I, about 12 on Ant. II, Figure 3A View Figure 3 4 View Figure 4 ) or short (present on Ant. II–IV, Figure 3A View Figure 3 5 View Figure 5 );

(3) smooth spine-like microchaetae at base of antennae ( Figure 3A View Figure 3 6 View Figure 6 ); three dorsal and two ventral on Ant. I; one internal, one external and one ventral on Ant. II;

(4) curved, thin S-chaetae on Ant. II–IV ( Figure 3A View Figure 3 7);

(5) rod-like chaetae ( Figure 3A View Figure 3 8), one dorso-distal on Ant. II;

(6) short, thin chaetae on Ant. I–IV.

Ant. III organ with chaetae 2 and 3 rod-like, chaetae 1, 4 and 5 shorter than 2, chaeta 8 stronger than others ( Figure 3B View Figure 3 ).

Eyes absent. Lateral process of labial palp straight, thicker than normal chaetae, with tip reaching beyond apex of labial papilla ( Figure 3C View Figure 3 ). Subapical chaeta of maxillary outer lobe straight, slightly larger than apical one; three smooth sublobal hairs on maxillary outer lobe ( Figure 3D View Figure 3 ). Chaetae of labial base as M 1, R, E, L 1, L 2, all smooth; R 0.6–0.8 as long as chaeta M 1; chaetae X 2, X and X 4 smooth, the latter two as microchaetae; X 3 absent ( Figure 3E View Figure 3 ). Cephalic dorsal chaetotaxy with four (rarely five) sutural macrochaetae and three macrochaetae in Gr. II ( Figure 3F View Figure 3 ).

Dorsal macrochaetae shown in Figure 3G View Figure 3 . Th. II with one (m1) medio-median, two (m4, m4p) medio-lateral, 15–17 posterior macrochaetae and three lateral S-chaetae. Th. III with 15 central macrochaetae, five to seven lateral macrochaetae (m5, m6, a6, a6i, p5, p6 and m6i, with p5 and m6e usually smaller than others) and two lateral S-chaetae.

Trochanteral organ with 12–15 smooth spiny chaetae; seven or eight in the arms of “L” and four to seven between them ( Figure 3H View Figure 3 ). Inner differentiated tibiotarsal chaetae ciliate with ciliations not closely appressed to axis, the most distal one smooth on hind tibiotarsus; inner outstanding macrochaetae located at about onethird of distance from base, strongly ciliate and tapered ( Figure 3I View Figure 3 ). Unguis with one inner distal tooth and a pair of basal unequal teeth, the outer one larger with tip reaching beyond the distal inner tooth. Unguiculus with a large wing-like outer tooth. Tenent hair pointed, longer than unguiculus ( Figure 3J View Figure 3 ).

Abd. IV 2.8–4.3 times as long as Abd. III along dorsal midline. Abd. I with four macrochaetae centrally (m2–4, m4p) and two S-chaetae laterally; m4p slightly smaller than other macrochaetae. Abd. II with three (m3, m3e, m3ep) central, one lateral (m5) macrochaetae and two S-chaetae. Abd. III with one central (m3), three lateral (am6, pm6, p6) macrochaetae, two posterolateral mesochaetae (p5, p7), and two S-chaetae ( Figure 3K View Figure 3 ). Abd. IV with six (sometimes seven) central, six lateral macrochaetae and about 17 S-chaetae on each side; additional seventh macrochaeta inner to A3 rarely present ( Figure 3L View Figure 3 ). Abd. V with about 25 chaetae and three S-chaetae; pp6 sometimes absent; m2, m3 and m5 much larger than others ( Figure 3M View Figure 3 ). Tenaculum with 4 + 4 teeth and one large striate chaeta. Ventral tube anteriorly not seen clearly; posteriorly with four or five smooth chaetae; each lateral flap with four or six smooth and zero to three ciliate chaetae ( Figure 3N–O View Figure 3 ). Manubrium with several smooth chaetae. Manubrial plaque with two pseudopores and two ciliate chaetae ( Figure 3P View Figure 3 ). Distal smooth part of dens subequal or slightly shorter than mucro. Mucronal apical tooth thick and blunt; basal spine long, its tip reaching the tip of apical tooth ( Figure 3Q View Figure 3 ).

Ecology and distribution

Coecobrya aokii is so far endemic to Espiritu Santo island. Ecological data are not given in the original description of Yoshii (1995). In our material, C. aokii was found in forest litter and at the bottom of a shaft.

Remarks

This species is characterized by four sutural cephalic chaetae, smooth microchaetae X and X 4 present on ventral side of the head, two medio-lateral macrochaetae on Th. II, four macrochaetae on Abd. I, few smooth chaetae on posterior face of ventral tube. Our specimens agree in most characters with Yoshii’s description, particularly chaetotaxy of Th. II–Abd. III (Abd. IV not mentioned in original description), but differ from the latter in three smooth sublobal hairs on maxillary outer lobe (two after Yoshii, 1995) and the presence of smooth chaetae on manubrium; because actually such smooth chaetae were often lost, Yoshii may have overlooked this detail in his description.