Coecobrya boneti ( Denis, 1948 )

Zhang, Feng, Man, Le Cong & Deharveng, Louis, 2011, A review of the boneti - group of the genus Coecobrya (Collembola: Entomobryidae), Zootaxa 2748, pp. 61-68 : 62-66

publication ID	https://doi.org/ 10.5281/zenodo.205766
DOI	https://doi.org/10.5281/zenodo.5683237
persistent identifier	https://treatment.plazi.org/id/03A487AF-4D76-9630-FF58-1AABA58E61D9
treatment provided by	Plazi
scientific name	Coecobrya boneti ( Denis, 1948 )
status

Treatment

Coecobrya boneti ( Denis, 1948)

( Figs 1–3 View FIGURE 1 View FIGURE 2 View FIGURE 3 )

Sinella boneti Denis, 1948

Type locality. Vietnam: Dalat: Lang Bian.

Material examined. Type material ( Vietnam: Lam Dong province: Dalat region): lectotype here designated: slide labelled as “Plateau du Lang Bian. 2000m. II-1930 Daw.33”, probably adult but sexual plate not visible, Dawydoff leg. One paralectotype on slide labelled as “Pic Lang Bian. 2800 m. 1.II.31 Daw.33”, probably a female. These two specimens correspond to the following citation in the original description “Plateau de Lang Bian, 2400 m. alt., forêt tropicale, II”. Altitude measurements from the 1930s were not as accurate as current measurements andthe Lang Bian is less than 2200 m in altitude, and no mountains of the Dalat area reaches 2800 m.

One female paralectotype on slide labelled as “Dalat. I.31, Daw.33”. One female paralectotype on slide labelled as “Dalat IX.30 Daw.33”. These last two specimens probably correspond to the following citation in the original description “Dalat, 1500 m. alt., forêt de Pins, XI et I”.

Other material from the Denis’ collection ( MNHN): 1 female specimen on slide labeled “Ream. 1000 m. Daw.33”, corresponding to the following citation in the original description “Réam ( Cambodge, golf de Siam), forêt tropicale humide, (1 exemplaire sans furca, rapporté sous réserves à l’espèce en question)” ( Denis, 1948). Deposited in MNHN. Its identification as C. boneti cannot be ascertained.

Additional material. Three female topotypes on slide, Vietnam: Dalat: Lam Dong: Lang Bian, alt. 1855m, in forest litter, 9.xii.2006, leg. Deharveng L. & Bedos A. (sample no. Vn 06-184, 185). One female topotype on slide, ibid, alt. 2050m, in forest soil, 21.xii.1998, leg. Deharveng L. & Bedos A. (sample no. Viet-727). Two topotypes on slide deposited in NJU and others in MNHN.

Redescription. Body length up to 1.24 mm. Body whitish, sometimes with scattered orange pigment ( Fig. 1 View FIGURE 1 ).

Antenna 1.9–2.1 times as long as cephalic diagonal. Ratio of antennal segments I: II: III: IV = 1: 1.6–2.2: 1.3–2.0: 2.6–3.2. Smooth straight mic at antennal base: 3 dorsal and 3 ventral on Ant. I, and 1 external, 1 internal and 1 ventral on Ant. II. Ant. II distally with 2 dorsal rod-like chaetae. Long smooth straight chaetae (sensu Deharveng 1990) at least 5 ventral on Ant. II and 1 internal on Ant. III. Ant IV without apical bulb.

Eyes as 1+1 small black spots. Labral papillae absent. Prelabral and labral chaetae 4/ 5, 5, 4, all smooth. Lateral process of labial palp as thick as normal chaetae, with tip reaching slightly beyond apex of labial papilla ( Fig. 2 View FIGURE 2 A). Subapical chaeta of maxillary outer lobe slightly larger than apical one; 3 smooth sublobal hairs on maxillary outer lobe ( Fig. 2 View FIGURE 2 B). Labial base chaetae as M, r, E, L1, L2, all smooth, R 0.25–0.3 length of M; chaetae X2 and X4 as mic, X smooth, X3 absent ( Fig. 2 View FIGURE 2 C). Cephalic dorsal chaetotaxy with 5 sutural mac and 4 (rarely 3) mac in Gr. II ( Fig. 2 View FIGURE 2 D).

Dorsal thoracic chaetotaxy shown in Fig. 2 View FIGURE 2 E. Th. II with 3 (m1, m2, m 2i) medio-medial mac, 3 medio-lateral (m4, m 4i, m4p) mac, 20–24 posterior mac and 3 lateral s-chaetae; p4, p 4i and p5 as mac. Th. III with 25–32 mac and 2 lateral s-chaetae; p2ep often as mic; a 6i and p5 as mac.

Trochanteral organ on hind leg with 11–15 smooth spiny chaetae; 8–10 in arms and 3–6 between arms ( Fig. 2 View FIGURE 2 F). Inner differentiated tibiotarsal chaetae “smooth” with ciliations closely appressed to axis; inner tibiotarsal outstanding mac located at about 0.33 distance from base, ciliate and tapered at tip ( Fig. 2 View FIGURE 2 G). Ungual basal paired teeth unequal, outer one much larger. Unguiculus acuminate with outer edge smooth. Tenent hair pointed, subequal to unguiculus in length ( Fig. 2 View FIGURE 2 H).

Abd. IV 4.1–4.5 times as long as Abd. III along dorsal midline. Abd. I with 6 (m2–4, m 2i, a3, m4p) central mac and 2 lateral s-chaetae; a3 rarely absent. Abd. II with 4 (a2, m3, m3e, m3ep) central mac, 1 (m5) lateral mac and 2 s-chaetae; mac m 3ei rarely present. Abd. III with 1 (m3) central mac, 3 (am6, pm6, p6) lateral mac and 3 s-chaetae ( Fig. 2 View FIGURE 2 I). Abd. IV with 6 (A3–4, A6, B4? of unclear homology, B5–6) central mac, 6 (F1, E2–4, E2p, D3) lateral mac and 17–21 s-chaetae ( Fig. 2 View FIGURE 2 J). Abd. V with 3 s-chaetae; mac m2, m3 and m5 always much larger than others; mac p4p present ( Fig. 2 View FIGURE 2 K). Tenaculum with 4 + 4 teeth and one large striate chaeta. Ventral tube anteriorly with 6 ciliate chaetae on each side ( Fig. 3 View FIGURE 3 A); posteriorly with 8 smooth chaetae; each lateral flap with 9 smooth chaetae ( Fig. 3 View FIGURE 3 B). Manubrium with smooth chaetae. Manubrial plaque with 2 pseudopores and 3 ciliate chaetae ( Fig. 3 View FIGURE 3 C). Distal smooth part of dens slightly longer than mucro in length. Mucro falcate and basal spine long with tip reaching about tip of apical tooth ( Fig. 3 View FIGURE 3 D).

Distribution. Southern Annamitic Cordillera around Dalat ( Vietnam). The record from Cambodia needs confirmation.

Habitat. Litter and soil in deciduous forest above.

Remarks. Coecobrya boneti is characterized by weak pigmentation, 1+1 eyes, mic R, X2 and X4 on ventral side of the head, mac p4, p 4i and p5 present on Th. II, outer edge of unguiculus smooth, “smooth” inner tibiotarsal chaetae, and smooth chaetae on manubrium. Coecobrya boneti is most similar to C. indonesiensis , but differs from the latter in smaller labial chaeta R, presence of mac m 4i and p5 on Th. II, and 6+6 central mac on Abd. IV ( Table 1 View TABLE 1 ).

Characters boneti indonesiensis tetrophthalma tukmeas mulun Number of eyes 1+1 1+1 2+2 1+1 3+3 Type locality. Vietnam: Dalat.

Material examined. Holotype juvenile, Vietnam: Lam Dong: Dalat, 1500m, I-1931 (“Dawyd. 33”) (after holotype slide label). Deposited in MNHN.

Topotypes: 5 females on slide, 21 specimens in alcohol, Vietnam: Lam Dong: Dalat: Lang Bian, alt. 1885m, 9.xii.2006, in forest litter, leg. Deharveng L. & Bedos A. (sample no. Vn 06-184); 1 female and 2 males on slide, 4 specimens in alcohol, ibid: Dalat: Lam Dong: Datanla vallon, 9.xii.2006, in forest soil, leg. Deharveng L. & Bedos A. (sample no. Vn 06-192). Five topotypes (3 on slide and 2 in alcohol) deposited in NJU, others in MNHN.

Redescription. Body length up to 1.27 mm. Body from whitish with scattered orange pigment to reddish with apparent orange bands. ( Fig. 4 View FIGURE 4 )

Antenna 1.65–1.97 times as long as cephalic diagonal. Ratio of antennal segments I: II: III: IV = 1: 1.75– 2.25: 1.50–2.00: 2.90–4.00. Smooth straight mic at the antennal base 3 dorsal and 2 ventral on Ant. I, and 1 external, 1 internal and 1 ventral on Ant. II. Ant. II distally with 1 dorsal rod-like chaeta. Long straight chaetae absent on antennae. Ant. III organ with 2 rods. Ant. IV without apical bulb.

Eyes as 2+2 separated black spots, the anterior ones larger. Labral papillae absent. Prelabral and labral chaetae 4/ 5, 5, 4, all smooth. Lateral process of labial palp slightly curved, as thick as normal chaetae, with tip reaching beyond apex of labial papilla ( Fig. 5 View FIGURE 5 A). Subapical chaeta of maxillary outer lobe slightly larger than the apical one; 3 smooth sublobal hairs on maxillary outer lobe. Labial base chaetae as M, r, E, L1, L2, all smooth, chaetae r 0.4–0.5 length of M; chaetae X and X2 smooth, X4 ciliate, X3 absent ( Fig. 5 View FIGURE 5 B). Dorsal cephalic chaetotaxy with 3 sutural mac and 4(3) mac in Gr. II ( Fig. 5 View FIGURE 5 C).

Dorsal chaetotaxy shown in Fig. 5 View FIGURE 5 D. Th. II with 3 (m1, m2, m 2i) medio-medial, 2 (m4, m4p) medio-lateral, 12–15 posterior mac and 3 lateral s-chaetae; macrochaeta p5 present. Th. III with about 20 mac and 2 lateral schaetae; p5 as mic.

Trochanteral organ on hind leg with 7–8 smooth spiny chaetae; 5–6 in arms and 2 between arms ( Fig. 5 View FIGURE 5 E). Inner differentiated tibiotarsal chaetae ciliate with ciliations not closely appressed to axis; inner outstanding mac located at about 0.33 distance from base, strongly ciliate and tapered at tip ( Fig. 5 View FIGURE 5 F). Ungual basal paired teeth unequal, outer one much larger. Unguiculus acuminate with outer edge smooth. Tenent hair pointed, subequal to unguiculus in length ( Fig. 5 View FIGURE 5 G).

Abd. IV 2.6–4.4 times as long as Abd. III along dorsal midline. Abd. I with 3 (m2, m3, m4) mac and 2 lateral schaetae. Abd. II with 3 (a2, m3, m3e) central, 1 (m5) lateral mac and 2 s-chaetae. Abd. III with 1 (m3) central, 2 (pm6, p6) lateral mac and 3 s-chaetae ( Fig. 5 View FIGURE 5 H). Abd. IV with 3 (A6, B4? of unclear homology, B5) central, 5 (E2p, E2–4, D3) lateral mac and about 20 s-chaetae ( Fig. 5 View FIGURE 5 I). Abd. V with about 27 chaetae and 3 s-chaetae; m2, m3 and m5 much larger than others ( Fig. 5 View FIGURE 5 J). Tenaculum with 4 + 4 teeth and one large striate chaeta. Ventral tube anteriorly with 5–6 ciliate chaetae ( Fig. 5 View FIGURE 5 K); posteriorly with 8 smooth chaetae ( Fig. 5 View FIGURE 5 L); each lateral flap with 6 smooth chaetae ( Fig. 5 View FIGURE 5 K). Manubrial smooth chaetae absent. Manubrial plaque with 2 pseudopores and 2 ciliate chaetae. Distal smooth part of dens 2–3 times length of mucro. Mucronal basal spine long with tip reaching about tip of apical tooth ( Fig. 5 View FIGURE 5 M).

Distribution. Southern Annamitic Cordillera around Dalat ( Vietnam).

Habitat. In deciduous forest litter and soil.

Remarks. As the only species with 2+2 eyes in Coecobrya , C. tetrophthalma is characterized by 3 cephalic sutural mac, ciliate X4 on ventral side of the head, presence of mac p5 on Th. II, absence of mac am6 on lateral Abd. III, 3+3 central mac and absence of mac F1 on Abd. IV, and long smooth part of dens. It is most similar to C. mulun in ciliate inner differentiated chaetae, absence of smooth chaetae on manubrium, chaetotaxy of Abd. II and central Abd. IV, but differs from the latter in 2+2 eyes, absence of m 4i and p4 on Th. II, absence of m5 on Th. III, 3+3 mac on Abd. I, 2+2 on lateral Abd. III, and 5+5 on lateral Abd. IV.

Inner tibiotarsal differentiated chaetae “smooth”	“smooth”	ciliate	“smooth”	ciliate
Trochanteral spines 11–15	9	7–8	11–14	10–11
Smooth chaetae on manubrium +	+	-	+	-
Labial chaetae R/M 0.2–0.3	0.8–0.9	0.4–0.5	0.15	0.5
Ventral chaetae of the head X2 smooth X4 smooth	- smooth	- smooth	- smooth	ciliate ciliate
Cephalic sutural chaetae 5	5	3	5	5
Chaetotaxy of Th. II mac m4i + mac p4 + mac p5 +	- + -	- - +	- + -	+ + +
Chaetotaxy of Th. III mac m5 - mac a6 +	- +	- -	+ +	+ -
Chaetotaxy of Abd. I 6+6	6+6	3+3	4+4	5+5
Central mac on Abd. II 4+4	5(4)+5(4)	3+3	3+3	3+3
Lateral mac on Abd. III 3+3	3+3	2+2	3+3	3+3
Chaetotaxy of Abd. IV central mac 6+6 lateral mac 6+6	7+7 6+6	3+3 5+5	6+6 6+6	3+3 6+6
Coecobrya tetrophthalma (Denis, 1948) Figs 4–5
Sinella tetrophthalma Denis, 1948