CHELODESMIDAE Cook, 1895

Bouzan, Rodrigo S., Iniesta, Luiz Felipe M., de Souza, Claudio A. R., Zampaulo, Robson A. & Brescovit, Antonio D., 2020, Taxonomic review of the Amazonian millipede genus Parastenonia Hoffman, 1977 and description of a new species from iron-ore caves (Polydesmida: Chelodesmidae), Journal of Natural History 53 (45 - 46), pp. 2781-2799: 2782-2784

publication ID

http://doi.org/ 10.1080/00222933.2020.1749956

publication LSID

lsid:zoobank.org:pub:CCBEED10-DCB4-48C9-A71D-CED3462DD72A

persistent identifier

http://treatment.plazi.org/id/F37787B8-1A09-C456-FE35-FB6D9FF0FE21

treatment provided by

Carolina

scientific name

CHELODESMIDAE Cook, 1895
status

 

Family CHELODESMIDAE Cook, 1895  

Subfamily CHELODESMINAE Cook, 1895  

Tribe Priodesmini Hoffman, 1977  

Genus Parastenonia Hoffman, 1977  

Parastenonia Hoffman, 1977: 449 – 459   . Type species: Priodesmus aurae Schubart, 1947   [= Priodesmus parae Cook 1895   ], by original designation. Hoffman 1980: 152; Shelley et al. 2000: 120.

Diagnosis

Males of Parastenonia   differ from those of other chelodesmid genera by the combination of the following characters: metaterga granular and crossed by a transversal sulcus ( Figure 4 View Figure 4 (d)), as in Cypraeogona   , Cayenniola   , Cearodesmus   and Brasiloschubartia   , from which however this genus differs in the shape of the gonopod; lateral edge of paranota trilobed by the presence of two deep sinuses ( Figure 4 View Figure 4 (a,b)), as in Priodesmus   and Stenonia   , (see Attems 1938, figs 68 – 69; Jeekel 1963, figs 30 – 32) however without modifications on the walking legs; gonocoxae large, with a dorsal field of setae; a long slender acuminate process on acropodite and an elongated prefemoral process ( Figure 9 View Figure 9 (a,b)).

Redescription

General measurements. Body length between 32.30 mm (female of P. parae   ) and 22.60 mm (male of P. carajas   sp. nov.).

Colouration (in 70% ethanol). Variable among species, ranging from reddish brown to ochre.

Head. With scattered tubercles, some of which bearing setae ( Figure 2 View Figure 2 (a – f)); shape of the incisura lateralis suboval. Antenna elongated, about 1.5x the width of midbody ring ( Figure 3 View Figure 3 (a – d)).

Body rings. Integument with small tubercles, without setae ( Figure 4 View Figure 4 (a,b,d,e)). A transversal groove on the metazonite. Collum with the anterior border arched and posterior border straight. Spiracles oval. Sternites without modifications. Ozopores on trunk rings: 5, 7, 9, 10, 12, 13, 15 – 19 (the standard polydesmid pore formula), located at the tip of the intermediate paranotum; and surrounded by peritremata. Paranota: prominent and long, wide, covering part of the legs, without setae on the edges. Paranota divided laterally into three lobes: -pro; -meso and -meta ( Figure 4 View Figure 4 (a,b)). Telson: triangular, wide and with tubercles ( Figure 4 View Figure 4 (e)). Epiproct with five pairs of macrosetae projecting through the tubercles on the dorsal side and two pairs in the apical region; paraproct with two macrosetae on each valve; hypoproct with two macrosetae.

Legs. Granulated; scattered setae along the entire surface ( Figure 4 View Figure 4 (c)).

Male sexual characters. Gonopore located on the coxae of the legs of the third body ring, coxae rounded, with a large apical pore ( Figure 9 View Figure 9 (a)). Gonopod aperture large, rectangular-shaped; posterior edge slightly folded ( Figures 8 View Figure 8 (a – b) and 9(b)). Gonopods: coxae (Cx; Figures 6 View Figure 6 (a) and 9(c,d)) equivalent to about half the length of the telopodite, without spiniform process, with several setae on dorsal side; coxae dorsally prominent in ectal view. Cannula (C; Figure 9 View Figure 9 (e)) robust and hook-shaped. Spermatic groove: runs along the mesal side of the acropodite in the entire length (SG; Figure 6 View Figure 6 (b)). Telopodite elongated, divided into two parts: the prefemoral region ( Figure 9 View Figure 9 (d)) and the femoral region ( Figure 9 View Figure 9 (d)). Prefemoral process ( Figure 9 View Figure 9 (d)): branch long with stretch marks ( Figure 9 View Figure 9 (f)). Acropodite long divided into two parts, the larger central branch is the solenomere carrying the spermatic groove with a thin elongated branch, rising proximally from the femoral region ( Figure 9 View Figure 9 (d)).

Female sexual characters. Cyphopods elongated, situated directly behind the second pair of legs on the third body ring; composed of valves and operculum, all densely setose; two valves joined by a membrane and operculum apically, appressed against both larger

valves ( Figures 6 View Figure 6 (c – f) and 10(a – e)). A small projection of the valves with S-shaped curvature in the intermediate membrane ( Figures 6 View Figure 6 (c,d) and 10(a)).

Included species

Two species: Parastenonia parae ( Cook, 1895)   and P. carajas   sp. nov.

Distribution

Known only from Amazon rainforest in the state of Pará, Brazil ( Figure 11 View Figure 11 ).

Kingdom

Animalia

Phylum

Arthropoda

Class

Diplopoda

Order

Polydesmida

Family

Chelodesmidae

Loc

CHELODESMIDAE Cook, 1895

Bouzan, Rodrigo S., Iniesta, Luiz Felipe M., de Souza, Claudio A. R., Zampaulo, Robson A. & Brescovit, Antonio D. 2020
2020
Loc

Parastenonia

Shelley RM & Sierwald P & Kiser SB & Golovatch SI 2000: 120
Hoffman RL 1980: 152
1980