Electroxenus jezzinensis, Duy-Jacquemin & Azar, 2004

Duy-Jacquemin, Monique Nguyen & Azar, Dany, 2004, The oldest records of Polyxenida (Myriapoda, Diplopoda): new discoveries from the Cretaceous ambers of Lebanon and France, Geodiversitas 26 (4), pp. 631-641 : 633-635

publication ID

https://doi.org/ 10.5281/zenodo.4665318

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scientific name

Electroxenus jezzinensis

sp. nov.

Electroxenus jezzinensis View in CoL n. sp. ( Figs 1 View FIG ; 2 View FIG )

“Polyxenid millipede” – Grimaldi 1996: 36.

TYPE MATERIAL. — Holotype: one adult specimen, number JS 231/1, Acra collection, provisionally deposited in the Muséum national d’Histoire naturelle, Paris ( MNHN).

ETYMOLOGY. — After Jezzine, the type locality.

TYPE LOCALITY AND TYPE HORIZON. — Jouar Es-Sous locality, Jezzine area , Caza of Jezzine , Mouhafazit Loubnan El-Janoubi, South Lebanon ; Lower Cretaceous , Valanginian-Hauterivian (135-125 million years). The amber piece is mounted on a microscope slide in Canada balsam medium .

DIAGNOSIS. — As for genus.


Adult ( Figs 1 View FIG ; 2 View FIG )

Grimaldi (1996: 36) figured the habitus of the same specimen without giving a description. The sexual organs, penis or vulvae, normally located at the base of the second pairs of legs are not preserved; in addition the state of preservation of the coxae does not allow observation of the absence or the presence of coxal glands, hence the sex cannot be determined.

Measurements. Body length = 2.25 mm; penicil length = 0.70 mm; head trichomes length = 0.18 mm; total length = 3.10 mm.

Head. Six visible ocelli ( Fig. 2A View FIG ), but more might be present. The longer anterior trichomes of vertex are 200 µm long. Eight antennal articles. Length of right sixth article 2.5 times the diameter. Three or four sensilla basiconica observed on the seventh article, more visible on the right antenna. Three (perhaps four) thin sensilla basiconica visible on right article VI: two or three long and a third that seems shorter than the two others ( Fig. 2 View FIG B-D). Elongated lateral expansion of palp with at least 17 sensilla, but perhaps more ( Fig. 2F View FIG ). Labrum not visible.

Trunk. The long, thin trichomes of the tergites are grouped into two, separate, oval clusters with an additional posterior row, subdivided in its middle ( Fig. 2E View FIG ). The longer lateral trichomes of tergites reach 150 to 160 µm; the trichomes of posterior row are only 70 to 95 µm long. Only 12 pairs of legs are visible. Some pubescent cylindrical setae visible on coxae. Spine of tarsus II longer than the claw ( Fig. 2G, I View FIG ). Telotarsus with well visible posterior lamellate process longer than claw ( Fig. 2 View FIG G-I) and one anterior spinous denticle seen on several telotarsi. Telson with caudal penicil not of same type as Polyxenus Latreille, 1803 and Propolyxenus Silvestri, 1948 ( Condé 1969) ; trichomes of caudal penicil with five, six ( Fig. 2K View FIG ) or seven ( Fig. 2J View FIG ) aligned hooks).


Museum National d'Histoire Naturelle

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