Delamarephorura tami, Janion & Deharveng & Weiner, 2013

Janion, Charlene, Deharveng, Louis & Weiner, Wanda Maria, 2013, Synonymy Of Spicatella Thibaud, 2002 With Delamarephorura Weiner & Najt, 1999, And Description Of Two New Species (Collembola: Tullbergiidae), Raffles Bulletin of Zoology 61 (2), pp. 657-663 : 661-663

Delamarephorura tami , new species

Fig. 2 , Table 3

Material examined. — Holotype: 1 female (deposited in MNHN), Vietnam, Kien Giang province, Kien Luong, Hon Chong hills, Nui Bai Voi, cirque du Français, soil, Berlese extraction, coll. Quan-Mai (Vn04Hol-055), 2 Mar.2004.

Paratypes: 1 female and 1 male juvenile deposited in MNHN ; 1 male juvenile in ITB; 1 male juvenile in ISEA; same data as holotype .

Description. — Length. Holotype female: 0.65 mm, paratype male: 0.78 mm. Colour: white in alcohol. Granulation coarser on dorsal side of the body, with secondary granules larger on axial and lateral areas from Th. I to Abd. IV. Double-striate pseudocelli (type II after Weiner & Najt, 1991), their formula per half terga as 11/122/22221 ( Fig. 2A ).

Antennal segment IV with five rather strong sensilla S1, S4, S7, S8, and S9 (after D’Haese, 2003) = a–e (after Rusek, 1971), a microsensillum, a subapical organite very short, rooting deeply into the integument and a small exsertile apical vesicle. Antennal III-organ dorsally with two large ovoid sensory clubs and two small sensory rods protected by three large guard papillae and four guard chaetae, thick; ventrally, one ovoid bent sensory club ( Fig. 2C, D ). Antennal segment I and II with 7 and 11 chaetae respectively. Postantennal organ ear-shaped, 3 times as long as pseudocellus diameter, with 15 simple vesicles in two regular rows ( Fig. 2B ). Labral chaetotaxy: 2/42.

Dorsal chaetotaxy as in Figs. 2A, G and Table 3 with macro-, meso- and microchaetae, S-chaetae not clearly recognized. Lateral microsensilla on thoracic terga II and III present. Head with chaetae p1, p2 and p3 as mesochaetae, p4 as microchaeta and p5 as macrochaeta. Abdominal tergum VI with crescentic ridges, two conspicuous dorsal process and two anal spines on distinct papillae; no ventro-medial process. Anal spines 1.3 as long as inner edge of claw and 2.2 times as long as their basal diameter. Thoracic sterna II and III with 1+1 chaetae each.

Ventral abdominal chaetotaxy as in Fig. 2H . Abdominal sternum I with 2+2 chaetae and ventral tube with 4+4 laterodistal chaetae. Fine granulated area on abdominal sternum IV present in the position of the furcal rudiment, with 2+2 chaetae.

Tibiotarsi I, II and III with 11, 11, 10 chaetae: A1, A2, A3, A6 and A 7 in whorl A; B1, B2, B3, B4, B5, B6 (B1 absent in tibiotarsus III, Fig. 2E, F ); chaeta M absent. Femora I, II and III, each with 9 chaetae; trochanters I, II and III each with 5 chaetae; coxae I, II and III with 3, 6, 7 chaetae; subcoxae 2 of legs I without chaetae, of legs II and III, each with 4 chaetae; subcoxae 1 of legs I, II and III with 2, 3, 3 chaetae. Claw without tooth. Empodial appendage relatively thin and pointed,subequal on all legs, about 1/5 as long as inner edge of claw.

Etymology. — The species is named in honour of Truong Quang Tam from ITB of Ho Chi Minh City for his efforts to protect the highly threatened Hon Chong hills where the new species was collected.

Distribution. — Only known thus far from the type locality, in calcareous soil, at about 5 cm depth, under a dense thicket of broadleaved bushes, endemic species.

Remarks. — Delamarephorura tami , new species, is the only species of the genus with 11 chaetae on tibiotarsi I–II and chaeta M absent (See Table 1 for other differential characters). The species was collected in calcareous soil, at about 5 cm depth, under a dense thicket of broadleaved bushes. Among the hundreds of soil samples carried out in the Hon Chong hills, D. tami , new species, was only found in a single soil core from the “Cirque du Français”, a deep depression that is currently being quarried-out, as will be most of the Bai Voi hill ( Fig. 3 ). D. tami , new species, is another endemic species of the Hon Chong karst at risk of extinction, which can be added to the extensive list given by Deharveng et al. (2009).

Figures

Fig. 2. Delamarephorura tami, new species:A, dorsal chaetotaxy; B, postantennal organ and pseudocellus; C, antenna; D, antenna III-organ: sensory clubs and sensory rods; E, F, tibiotarsus III; G, chaetotaxy of abdominal terga V and VI; H, ventral chaetotaxy of abdomen. Scale bars = 0.1 mm (A, H), 0.05 mm (G), 0.01 mm (B, C, E, F).

Fig.3. Satellite view of Bai Voi hill (Kien Giang province, Vietnam) in 2006 and in 2011, illustrating the destruction of the type and only known locality of Delamarephorura tami, new species, by limestone quarrying (dates of the photos were inverted in Google Earth consulted in Dec.2011).