Corresponding author: Louis Deharveng (
Academic editor: L. Penev
The first
Yu D, Zhang F, Deharveng L (2014) A peculiar cave species of
In
PAO in
Until now, the only known species of
All type specimens were collected in caves with aspirators. After being photographed with a Jenoptik ProgRes C10+ camera mounted on a Leica MZ 16 stereomicroscope, specimens were cleared in lactic acid and mounted in Marc André II solution. The head, furca and legs were cut off from the trunk and mounted separately for detailed observation. The slide-mounted specimens were studied using a Leica DMLB microscope.
The pattern of dorsal cephalic chaetotaxy used here is modified from that
: antennal segment : postantennal organ : thoracic segment : abdominal segment , Nanjing Agricultural University, Nanjing, China , Muséum national d’Histoire naturelle, Paris, France
Vietnam, Tuyen Quang Province: Na Hang, Khuoi Sung, Hang Khuoi Sung, in cave,
Holotype female and three paratype females on slides, labelled with collectors’ sample number Vn0312-56. Deposited in MNHN (holotype and two paratypes) and NJAU (one paratype).
Body length 3.4–4.3 mm. Body with diffuse dark pigment all over; Ant. II, base of Ant. III and ventral side of Ant. I darker than other parts of antenna; eye patches black and small; clypeus, antero-dorsal region and posterior margin of head darker than other parts of head; anterior half of trunk darker than posterior half; head and trunk with bilaterally symmetrical white pattern formed by numerous unpigmented patches (
Antenna longer than body, Ant. IV lost, Ant. I:II:III ≈ 1.0:1.8:21.0, Ant. I and II dorsally scaled, Ant. III unscaled. Antennal chaetae poorly preserved and not studied. PAO oval, with thickened inner margin, its long axis as long as the diameter of anterior ocelli (
Trochanteral-femoral organ with 1, 1 chaetae (
Ventral tube scaled both anteriorly and posteriorly, lateral flap unscaled. Each side of anterior face with ca. 50 chaetae, posterior face with ca. 90 chaetae, each lateral flap with ca. 60 chaetae; all chaetae smooth.
Tenaculum unscaled, with 4+4 teeth, anterior face with 5 small smooth chaetae (
Macrochaetae distributed densely along anterior margin of Th. II (not drawn) and sparingly in posterior rows on terga. Th. II-Abd. V with 2,1/0,0,1,2,0 bothriotricha and 3,3/3,3,4,2,4 (3 central+1 lateral) posterior macrochaetae on each side; dorsal flap of Abd. VI with 13 macrochaetae (6+6 and 1 on middle line). Medial area of Th. II with two macrochaetae, the posterior one close to pseudopore; Abd. IV antero-laterally with one macrochaeta and one mesochaeta (
Named with reference to the presence of the postantennal organ.
Discrimination of
Species | Body colour | Length of antennae | Unguis teeth | Shape of dental spines | Dental spines formula | Number of mucronal intermediate teeth |
---|---|---|---|---|---|---|
|
yellowish with dark pigment along lateral margin of anterior terga | shorter than body | 4–5 | compound with very fine denticles | 5–8/3–6, I, 1–2, I | 6–7 |
|
pale | as long as body | 5 | compound with denticles of moderate size | 3/3–4, II | 8–9 |
dark grey | longer than body | 2 | compound with denticles of moderate size | 4–5/5–7, I, 1–2, I | 5–7 |
Most tomocerids have four prelabral chaetae, which is also common number in other groups of
So far, only two species of
The PAO of
Despite the presence of PAO,
The genus
We thank Dr Mark Judson (MNHN, Paris) for reviewing the English style. The China Scholarship Council provided a grant to the first author for studying at MNHN, Paris.