Dimorphaphorura jingyueensis, Sun, Xin & Wu, Donghui, 2012

Sun, Xin & Wu, Donghui, 2012, Two new species of the tribe Oligaphorurini Bagnall, 1949 (Collembola: Onychiuridae) from northeast China, Zootaxa 3526, pp. 45-52: 46-49

publication ID

http://doi.org/ 10.5281/zenodo.282740

publication LSID

lsid:zoobank.org:pub:8CA5233B-3ACF-4F91-BD47-DBA8FC719C6D

persistent identifier

http://treatment.plazi.org/id/03C81B31-FFFB-8D23-86EC-C7B2B2E57CEC

treatment provided by

Plazi

scientific name

Dimorphaphorura jingyueensis
status

sp. nov.

Dimorphaphorura jingyueensis   sp. nov.

Figs 1–15 View FIGURES 1 – 9 View FIGURES 10 – 16

Type material. Holotype female, 9 females and 4 males paratypes. China: Jilin Province: Jingyuetan National Forest Park (alt. ca 250 m, 43 ° 47 ' 26 " S, 125 ° 28 ' 35 " W), litter and soil, Berlese extraction, 18.V. 2007, leg. Wu Donghui. Holotype and 13 paratypes on slides are deposited in the collection of the Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun.

Description. Body color white in alcohol. Size 0.8–1.2 mm in females, 0.6–0.7 mm in males; holotype: 1.02 mm. Body slender and elongated.

Pseudocellar formula dorsally: 32 / 133 / 33353, ventrally: 11 /000/00000; subcoxa 1 of legs I –III with 1 pso each ( Figs 1 & 2 View FIGURES 1 – 9 ). Parapseudocellar formula ventrally: 00/000/ 212101, absent dorsally ( Figs 1 & 2 View FIGURES 1 – 9 ); subcoxa 1 of legs I –III with 1, 1 and 1 psx each. Pseudopore formula dorsally: 00/011/ 111100, ventrally: 00/ 111 /000 x00 ( Figs 1 & 2 View FIGURES 1 – 9 ).

Head. Antennae short and distinctly segmented, as long as head. Length ratio of antennal segments I: II: III: IV = 1: 1.5: 1.5: 1.5. Ant. IV with two distinct thickened S-chaetae, subapical organite with apex globular and basolateral ms just above posterior chaetae. Ant. III sensory organ composed of 5 papillae, 5 guard chaetae, 2 small sensory rods, 2 granulated sensory clubs, the outer about twice as large as the inner, and a lateral ms ( Fig. 7 View FIGURES 1 – 9 ). Ant. II with 14–15 chaetae. Ant. I with 8 chaetae. Antennal base with distinct granulation ( Fig. 4 View FIGURES 1 – 9 ). PAO located on cuticular furrow built with a 3 -lobed vesicle ( Fig. 4 View FIGURES 1 – 9 ). Dorsal cephalic chaeta d0 absent, 3 + 3 p-chaetae between posterior a-pso on head ( Fig. 1 View FIGURES 1 – 9 ). Mandible with a strong molar plate and 4 apical teeth. Maxilla bearing 3 teeth and 6 lamellae. Maxillary palp simple with 1 basal chaeta and 2 sublobal hairs ( Fig. 6 View FIGURES 1 – 9 ). Labral chaetae formula 4 / 342 ( Fig. 5 View FIGURES 1 – 9 ). Labium with 6 proximal, 4 basomedian (E, F, G, f) and 5 basolateral (b, c, d, e, e’) chaetae ( Figs 3 View FIGURES 1 – 9 & 10 View FIGURES 10 – 16 ); labial type A, papillae A –E with 1, 4, 0, 3, and 2 guard chaetae respectively ( Fig. 3 View FIGURES 1 – 9 ). Postlabial chaetae 4 + 4 along ventral groove ( Fig. 10 View FIGURES 10 – 16 ).

Body chaetotaxy. S-chaetae cylindrical, well differentiated, their formula 11 /011/ 222110 dorsally, 11 /000/ 0 0 0 100 ventrally ( Figs 1, 2 View FIGURES 1 – 9 & 10 View FIGURES 10 – 16 ); subcoxae 2 of I, II and III legs with 0, 0 and 1 S-chaeta, respectively. Smicrochaetae tiny and blunt, present on Th. II –III ( Fig. 1 View FIGURES 1 – 9 ). Ordinary chaetae differentiated in meso- and macrochaetae. Th. I tergum with 7 + 7 chaetae. Th. II –III and Abd. I –III terga with three chaetae on both sides of axial line and no dorsal axial chaetae ( Fig. 1 View FIGURES 1 – 9 ). Abd. IV tergum with one axial chaeta (m0), Abd. V tergum without axial chaetae, Abd. VI tergum with two axial chaetae ( Figs 1 View FIGURES 1 – 9 & 16 View FIGURES 10 – 16 ). Th. I, II and III sterna with 0+ 0, 1 + 1, 1 + 1 chaetae, respectively.

Appendages. Subcoxa 1 of legs I –III with 4, 5 and 6 chaetae, subcoxa 2 with 1, 4 and 4 chaetae, respectively. Tibiotarsi of legs I, II and III with 20 (11, 8, 1), 20 (11, 8, 1) and 19 (11, 7, 1) chaetae, respectively ( Figs 8 & 9 View FIGURES 1 – 9 ). Unguis without teeth. Unguiculus slender and pointed, as long as inner edge of unguis, without inner basal lamella ( Figs 8 & 9 View FIGURES 1 – 9 ). Ventral tube with 8 + 8 distal chaetae and 3–4 + 3–4 basal chaetae, without anterior chaetae ( Fig. 11 View FIGURES 10 – 16 ). Furca reduced to a finely granulated area with 2 + 1 chaetae posteriorly and further two manubrial rows of chaetae present ( Fig. 14 View FIGURES 10 – 16 ).

Female genital plate with 15–21 chaetae ( Fig. 13 View FIGURES 10 – 16 ), male genital plate with 24–28 chaetae. Male ventral organ present, being as 7 + 7 inflated chaetae on ventral tube and several on Abd. II –IV ( Figs 2 View FIGURES 1 – 9 & 12 View FIGURES 10 – 16 ). Anal valves with numerous acuminate chaetae; each lateral valve with a0 and 2 a 1; upper valve with chaetae a 0, 2 b 1, 2 b 2, c 0, 2 c 1, 2 c 2 ( Fig. 15 View FIGURES 10 – 16 ). Anal spines present on indistinct papillae, as long as inner edge of unguis ( Fig. 16 View FIGURES 10 – 16 ).

Etymology. Named for the name of the park where we found the new species.

Ecology. The new species found in a coniferous and broad-leaved mixed forest.

Remarks. The new species is similar to Dimorphaphorura pseudoraxensis ( Nosek & Christian, 1983)   in having 1 + 1, 3 + 3, and 3 + 3 pso on Th. I –III, respectively. Yet both can be distinguished by the number of pso on Abd. IV –V (5 + 5, 3 + 3 in D. jingyueensis   sp. nov. versus 4 + 4, 4 + 4 in D. pseudoraxensis   , respectively), the ratio of unguiculus/unguis (1 in D. jingyueensis   sp. nov. versus 0.8 in D. pseudoraxensis   ), the inner basal lamella of unguiculus (indistinct in D. jingyueensis   sp. nov. versus distinct in D. pseudoraxensis   ), the number of chaetae in distal whorl of tibiotarsi (11 in D. jingyueensis   sp. nov. versus 9 in D. pseudoraxensis   ) and the apical teeth on the mandible (4 + 4 in D. jingyueensis   sp. nov. versus 4 + 3 in D. pseudoraxensis   ).

D. jingyueensis   sp. nov. is very different from the only other known Chinese congener, D. sanjiangensis Sun & Wu, 2012   . They can easily be separated by the dorsal pso formula (32 / 133 / 33353 in D. jingyueensis   sp. nov. versus 32 /033/ 33343 in D. sanjiangensis   ), the ventral psx formula (00/000/ 212101 in D. jingyueensis   sp. nov. versus 00/ 000/ 122203 in D. sanjiangensis   ), the inner basal lamella of unguiculus (indistinct in D. jingyueensis   sp. nov. versus distinct in D. sanjiangensis   ), the ratio of unguiculus/unguis (1 in D. jingyueensis   sp. nov. versus 0.7 in D. sanjiangensis   ) and the chaetae on the upper valves (a 0, 2 b 1, 2 b 2, c 0, 2 c 1, 2 c 2 in D. jingyueensis   sp. nov. versus a 0, 2a1, b 0, 2 b 1, 2 b 2, c 0, 2 c 1, 2 c 2 in D. sanjiangensis   ).