Lissodesmus cognatus, Mesibov, 2005

Mesibov, Robert, 2005, The millipede genus Lissodesmus Chamberlin, 1920 (Diplopoda: Polydesmida: Dalodesmidae) from Tasmania and Victoria, with descriptions of a new genus and 24 new species, Memoirs of Museum Victoria 62 (2), pp. 103-146 : 112-113

publication ID	https://doi.org/ 10.24199/j.mmv.2005.62.4
DOI	https://doi.org/10.5281/zenodo.8066837
persistent identifier	https://treatment.plazi.org/id/03BDAA31-F549-FFAE-8470-F05C4A3A8AF6
treatment provided by	Felipe
scientific name	Lissodesmus cognatus
status	sp. nov.

Treatment

Lissodesmus cognatus View in CoL sp. nov.

Figures 25 View Figure 25 , 26 View Figure 26 , 27 View Figure 27 , 69 View Figure 69 cog, 70cog, 71cog, 76 (map)

Lissodesmus sp. NE3.— Mesibov, 1996: 17.— Mesibov, 1997:

567.— Mesibov, 2003a: 209.

Material examined. Holotype. Male, Australia, Tasmania. Weavers Creek , EQ 330091 (41°28'07''S 147°23'42''E), 380 m, 31.vii.1994, R. Mesibov & T. Moule, QVM 23 View Materials :15287. GoogleMaps

Paratypes. 2 males, North Esk River , EQ336079 (41°28'46''S 147°24'08''E), 490 m, 23.ii.1992, R. Mesibov, QVM 23 View Materials GoogleMaps :15284; 2 males, “ Elkington ” property, EP312979 (41°34'11''S 147°22'27''E), 350 m, 18.iii.1992, R. Mesibov, AM KS91171 (ex QVM 23 View Materials :15283) GoogleMaps ; 4 males, same details, QVM 23 View Materials :15283, 2 dissected ; 2 females, Weavers Creek , EQ307122 (41°26'27''S 147°22'02''E), 680 m, 19.vii.1994, R. Mesibov, QVM 23 View Materials GoogleMaps : 15289; male, Tower Hill, EP 708983 (41°33'49''S 147°50'56''E), 720 m, 31.xii.1998, R. Mesibov & K. Bonham, QVM 23 View Materials :40758 GoogleMaps ; 10 males, Coxs Creek , EQ767040 (41°30'42''S 147°55'08''E), 480 m, ii.2001, R. Bashford, pitfall sample, QVM 23 View Materials :24738, 2 dissected GoogleMaps .

Other material. 14 males, 2 females and 5 juveniles from “Aplico” property, Coxs Creek , Grants Creek , Long Gully Creek , Musselboro , Rabbity Creek , Tower Hill and Weavers Creek (see “ Lissodesmus supplement” for details) .

Description. Male c. 14 mm long, H = 1.3 mm. In alcohol, well-coloured specimens under low magnification near-white in body colour with red tinge transversely near posterior margins of metatergites and dorsa of prozonites. Antennae long, slender ( Fig. 69 View Figure 69 cog), about 2.5X a socket diameter apart. Paranota reduced, R = 1.3 ( Fig. 70 View Figure 70 cog); posterior corners turned up slightly. Legs fairly slender, tarsus about as long as femur, tibia with slight ventral distal swelling ( Fig. 71 View Figure 71 cog). Telopodite ( Figs 25 View Figure 25 , 26 View Figure 26 , 27 View Figure 27 ) reaching leg 5 when retracted. Solenomere arising at half the telopodite height, directed posterodistally at a small angle to telopodite axis, terminating with toothed subapical collar at about half the prefemoral process height. Tibiotarsus a slightly flattened, bluntly pointed rod about as wide as solenomere but shorter, more or less parallel to solenomere but gradually curving laterally. Femoral process arising proximal to solenomere origin (at about one-third the telopodite length), pressed close to prefemoral process proximally, forked near base; branches more or less equal, blade-like, pointed, the anterior branch directed distally and terminating at level of solenomere tip, the posterior branch curving anteriorly, its tip sometimes lying between anterior branch and prefemoral process. Prefemoral process about half the width of telopodite base, bending posteriorly at about two-thirds its length and tapering, the flexed distal section bearing a comb of c. 15-20 large, irregular, proximally directed teeth. Uncus prominent, arising at about half the prefemoral process length (about the level of the solenomere tip) on well-defined longitudinal ridge near lateral edge of process.

Distribution and habitat. An uncommon species known from wet eucalypt forest in two disjunct areas c. 35 km apart in north-east Tasmania ( Fig. 76 View Figure 76 ): south and west of Mt Barrow (c. 30 km 2), and north and east of Tower Hill (c. 15 km 2).

Etymology. Latin cognatus (“kindred”), adjective. At first glance, L. cognatus seems to be closely related to both L. alisonae and L. hamatus .

Remarks. Furry individuals of L. cognatus have been found near the North Esk River, Weavers Creek and Musselboro. Specimens from the “Elkington” property, a few kilometres to the south in the South Esk River catchment, are non-furry, as are all specimens from the Tower Hill portion of the range. I have previously speculated ( Mesibov, 1997, 2003a) that L. cognatus is a stabilised hybrid of L. alisonae and L. hamatus , i.e. a product of reticulate evolution. The two putative parents meet with minimal overlap in the western block of the L. cognatus range, and L. hamatus occurs in the eastern block.