Yuukianura Yosii, 1955

Deharveng, Louis, Palacios-Vargas, José G. & Bedos, Anne, 2017, A list of Yuukianura Yosii, 1955 species of the world (Collembola: Neanuridae: Neanurinae: Lobellini), with description of a new species of unusual ecology from Santo Island (Vanuatu), Zoosystema 39 (1), pp. 55-67 : 57

Genus Yuukianura Yosii, 1955

Yuukianura Yosii, 1955: 225 .

TYPE SPECIES. — Protanura aphoruroides Yosii, 1953 , by original designation.

DISTRIBUTION. — Tropical and East Asia ( China, Japan, Malaysia, Nepal, North and South Korea), Pacific islands (Hawaii, New Caledonia, Tonga, Vanuatu), Australia, Great Britain (introduced).

NEW DIAGNOSIS. — Lobellini elongate, parallel-sided and flattened. Body colour red, yellow or white. Eyes 3 +3 or absent, rarely pigmented. Abdominal segments subequal in length. Mouthparts thick, maxillary head with three strong teeth and 2 lamellae, a longer ciliated one and usually a shorter pointed one, mandible thick, triangular, with a few strong intermediate teeth and a short subdistal whip. Labium and labrum short, truncated. Labral formula 2,2 when observed. Chaetotaxy of body and appendages not polychaetotic. Dorsal macrochaetae straight and long, usually smooth. Dorsal tubercles inconspicuous except those of Abd. VI. Line Di1-De1 crossed by line Di2-De2 on posterior area of head. Chaetae Di shift laterally close to De on Abd. V. Abd. VI bilobed. No cryptopygy.

REMARKS

In the lateral shift of chaetae Di on Abd. V, the genus Yuukianura Yosii, 1955 is most similar to the monospecific genus Riozura Cassagnau, 1983 from Pakistan with its species R. yoshibai (Yosii, 1963), originally described in the genus Lobella Boerner, 1906 . This last genus differs from the former in a slightly reduced mandibular head and a more convex and non-parallel body shape.

Only three described species are listed as Yuukianura in the reference website of World Collembola maintained by Bellinger et al. (2016): Y. aphoruroides ( Yosii, 1953) , Y. halophila Yosii, 1955 and Y. szeptyckii Deharveng & Weiner, 1984 . In fact, five other species described or cited in various genera or subgenera (Coecoloba Yosii, 1956, Lobella Boerner, 1906 , Neanura MacGillivray, 1893 , Protanura Boerner, 1906, Pseudocolonavis Salmon, 1964) are transferred here to Yuukianura , as they exhibit most important diagnostic features of the genus, i.e. a flat parallel habitus with poorly developed tubercles, complex mouthparts and a lateral shift of chaetae Di towards the De group on Abd. V. With the new species Yuukianura judithae n. sp. described here, nine species can be unambiguously assigned to Yuukianura . Two additional species described as Yuukianura do not match the generic diagnosis of the genus and are too insufficiently described to be placed in another genus of Lobellini . They are considered here as incertae sedis. These 11 species (nine Yuukianura and two incertae sedis) are listed below.

Yuukianura aphoruroides

( Yosii, 1953)

Protanura aphoruroides Yosii, 1953: 69 . — Massoud 1967: 292.

Yuukianura aphoruroides – Yosii 1955: 384.

Lobella (Yuukianura) aphoruroides – Yosii 1959: 13.

Lobella (Lobella) aphoruroides – Yosii 1977: 150.

TYPE COUNTRY. — Japan.

DISTRIBUTION. — Great Britain ( Deharveng & Greenslade 1992, in earthworm-rearing beds), Japan, Malaysia ( Goto 1955, Yosii 1959), China ( Stach 1964).