Lophoturus judsoni, Duy-Jacquemin, 2002

Duy-Jacquemin, Monique Nguyen, 2002, New species and distribution of the genera Lophoturus and Ancistroxenus (Myriapoda, Diplopoda, Penicillata) in the Caribbean and northern South America, Zoosystema 24 (2), pp. 451-470 : 453

Lophoturus judsoni n. sp.

( Fig. 1 )

TYPE MATERIAL. — Tobago. Man of War Bay , North of Charlotteville, track to Pigeon Peak, leaf litter in forest, 11.VII.1999, M. Judson leg., ad. holotype ; ad. paratype. — Rainbow falls , bamboo litter, 10.VII.1999, M. Judson leg., ad. paratype .

ETYMOLOGY. — This species is named after its collector, Dr Mark Judson (Muséum national d’Histoire naturelle, Paris).

DESCRIPTION

Measurements

Body length (without caudal pencil) 2.45 mm (holotype); 2.30 mm (paratype from Rainbow falls ) ; 2.05 mm (paratype from Man of War Bay ). Tarsus II length of 13 th leg 140 (holotype) to 150 µm .

Head

Anophthalmic.

Vertex with a pair of posterior tufts, each arranged in two rows: anterior row of 14 to 16 trichomes, posterior row of six to nine trichomes; the distance between each tuft is half their length ( Fig. 1A ).

The length and diameter of the antennal articles are represented in Fig. 1G . Antennal article VI with three dorsal sensilla basiconica arranged in a longitudinal row; their orientation is oblique to longitudinal axis of antennal article ( Fig. 1G, I ); the two apical sensilla (probably homologous of p and i) are thick and the basal sensillum (homologous of a) is thin and shorter than the other two. One apical sensillum coeloconicum c is present, but there is no setiform sensillum. Antennal article VII with two dorsal sensilla: anterior one thin a and posterior one thick p, directed towards apex of article, as usual in Penicillata, and one sensillum coeloconicum c ( Fig. 1H ).

Three trichobothria arranged triangularly, the apex of anterior one is sligthly dilated and ended in a short spine-hair ( Fig. 1D ).

Labrum clothed with four posterior rows of cuticular setae ( Fig. 1E ). No lamellar teeth on anterior margin. Clypeo-labrum with nine setae (11 in female from Rainbow falls) along the posterior margin.

Palpi of gnathochilarium with 18 sensilla ( Fig. 1F ).

Trunk

The trichomes of each tergite are grouped in two, separate, oval clusters with an additional posteri- or row barely subdivided in its middle ( Fig. 1C ), except on collum ( Fig. 1B ); distance between clusters much greater than length of each cluster. Collum with tufts of 47 to 54 trichomes (about 60 in female from Rainbow falls); lateral left protuberance of collum with seven or eight trichomes (l. p. in Fig. 1B ); each oval cluster of tergites II to X with 32 to 42 trichomes (45 to 54 in female from Rainbow falls) and posterior row with 30 to 41.

Legs

Each leg article, except for tibia and tarsus, bearing pubescent and pear-shaped setae ( Fig. 1K ); coxae I to XII bearing two to five setae; XIII with zero to two setae; trochanters and prefemora with one seta; femora with one seta, very rarely two. Spine of tarsus II longer than telotarsus ( Fig. 1J ). Telotarsus without ventral process, only two dorsal, subequal, anterior and posterior denticles; claw without ventral denticle.

Telson

Seven to 11 trichomes a, of which six to seven placed on internal side and two to four on external side of the group of trichomes b -c1-c3. Trichomes of caudal pencil with two to eight hooks.

REMARKS

This new species is characterized by a number of distinctive features: the implantation of the basiconica sensilla on its sixth antennal article; the direction of these sensilla, oblique to longitudinal axis of the antenna, is the only such case known in Penicillata. Morever, L. judsoni n. sp. differs from L. drifti Condé & Terver, 1964 in having only the posterior area of the labrum covered by cuticular setae (about four rows); the whole surface of the labrum is covered by cuticular setae in L. drifti . In the latter species the posterior row of trichomes is widely subdivided on the middle of each tergite, as opposed to barely subdivised in L. judsoni n. sp.

Figures

FIG. 1. — Lophoturus judsoni n. sp.; A-C, holotype; A, insertions of trichomes of posterior tufts and of left trichobothria on vertex; B, C, trichomes on collum and left half segment II; D-F, paratype from Man of War Bay; D, trichobothria; E, labrum; F, right palpus of gnathochilarium; G-K, from Rainbow Falls; G, left antenna; H, I, detail of sensilla on articles VII and VI of antenna G; J, tarsus II and telotarsus of right leg IV; K, coxal seta of right leg II. Abbreviations: a, anterior sensillum basiconicum; c, sensillum coeloconicum; i, intermediate sensillum basiconicum; l.p., lateral protuberance; p, posterior sensillum basiconicum. Scale bars: A-G, 50 µm; H-K, 25 µm.