Haematotropis divergens ( Chamberlin, 1918 ) De & Bueno-Villegas & Rafael, 2021

De, Thaís M., Bueno-Villegas, Almeida Julián & Rafael, José A., 2021, Taxonomic review of the millipede genus Haematotropis Jeekel, 2000 (Diplopoda, Polydesmida, Aphelidesmidae, Aphelidesminae) with descriptions of thirteen new species, Zootaxa 5064 (1), pp. 1-71 : 61-68

publication ID	https://doi.org/ 10.11646/zootaxa.5064.1.1
publication LSID	lsid:zoobank.org:pub:65B0A21A-8B8D-4B55-B6F0-8BE60EB8D3BC
DOI	https://doi.org/10.5281/zenodo.5815198
persistent identifier	https://treatment.plazi.org/id/03876671-FFCD-157F-13C5-C8A5FC8DA289
treatment provided by	Plazi
scientific name	Haematotropis divergens ( Chamberlin, 1918 )
status	comb. nov.

Treatment

Haematotropis divergens ( Chamberlin, 1918) , new combination

Figs 44 View FIGURE 44 , 45 View FIGURE 45 , 50 View FIGURE 50

Aphelidesmus divergens Chamberlin, 1918: 249 View in CoL .

Aphelidesmus divergens: Loomis (1934: 34 View in CoL , fig. 18).

Aphelidesmus guianensis Chamberlin, 1923: 46 View in CoL , pl. 18, figs 119–122. syn. nov.

Ochrotropis guianensis: Jeekel (2000: 82 View in CoL , figs 9–11); Almeida et al. (2018: 355, fig. 2).

Diagnosis. Adult males of H. divergens n. comb. differ from other Haematotropis species based on the following combination of characters: gonopod without LP1 and LP2, presence of LP3; opening of the solenomere originates at the distal end of acropodite; solenomere without projection ( Fig. 45A, C, D View FIGURE 45 ).

Material examined. 1 ♂, Trinidad and Tobago, Monte Santo Benedict (10º39’49’’N, 61º23’56”W), 27– 30. VI GoogleMaps .1999, R GoogleMaps . Pinto-da-Rocha leg. ( MZUSP 962 View Materials ) ; 1 ♂, idem, 27–30. VI .1999, R . Pinto-da-Rocha leg. ( MZUSP 962 View Materials ) ; 1 ♂, Trinidad, Tamana Caves , 28.I.1966, Joana Darlington leg. Labeled as A. divergens (VMNH) ; 1 ♂, idem, North Range , Lopinot Cave, 24.II.1967, J. Darlington leg., identified on the label as A. divergens (VMNH) ; 1 ♂, idem, under stones, Mt. Tabor , 25.I.1932, D. Vesey-Fitzgerald leg., labeled as A. divergens (VMNH) ; 4 ♂♂, idem, Tamana Caves , 15.II.1966, Joanna Darlington leg., identified on the label as A. divergens (VMNH) ; 5 ♂♂, Tobago, A. V . Armour Expedition , 19.II.1932, Scarborough, labeled as A. divergens (VMNH) .

Redescription.

Size and form. Body length = 48 and wide = 6 mm. TL/GW = 8.

Coloration (long preserved in 70% ethanol). Head, prozonite, metazonite and telson light brown, polygonal areas on rings 11–18 of the metazonite, antennomeres, paranota, sides of metazonite and legs yellow ( Fig. 44A–D View FIGURE 44 ).

Head. Dorsal surface smooth and shiny, without microgranulations.

Trunk. Collum 1.3 mm long, 3.4 mm wide; dorsal surface of all rings smooth and shiny, without microgranulation; posterolateral margins slightly concave ( Fig. 44A, B View FIGURE 44 ). Rings 2–19: prozonite and metazonite smooth and shiny, without microgranulation in dorsal region of all rings. Anterolateral teeth on paranota of rings 2–4 ( Fig. 2G View FIGURE 2 ). Lateral margins of ring 2 not projected posteriad ( Fig. 44A, B View FIGURE 44 ). Gonopodal aperture elliptical, approximately 0.8 mm wide and 0.5 mm long at midpoints. Telson ( Fig. 44D View FIGURE 44 ) smooth and shiny, without microgranulations.

Legs. Smooth and shiny, without microgranulations.

Gonopods. Left gonopod structure as follows: coxa with lateral swelling at midlength absent ( Fig. 45A, C View FIGURE 45 ); acropodite elongated, about four times as long as prefemur; median region expanded, cup-shaped in ventral view, with a concavity and cavity ( Fig. 45D View FIGURE 45 ); distal region of acropodite lightly sinuous, not bifurcate, bivalve shellshaped, curved ventrally at a 70° angle ( Fig. 45A–D View FIGURE 45 ); VP1 emarginated on posterior region, not very evident, not exceeding the width of ventral region of acropodite, in lateral view ( Fig. 45A, C View FIGURE 45 ); VP2, LP1 and LP2 absent, LP3 hemispheric ( Fig. 45B, D View FIGURE 45 ); DP absent. Opening of solenomere located at distal end of acropodite ( Fig. 45A, C, D View FIGURE 45 ), without projection. Solenomere without projection ( Fig. 45A, C, D View FIGURE 45 ).

Remarks. Aphelidesmus guianensis was described by Chamberlin (1923) from Guyana ( Fig. 46A–D View FIGURE 46 ). Jekeel (2000) established a new combination of A. guianensis , transferring it to the new genus Ochrotropis Jekeel, 2000 . However, he failed to justify his decision and only mentioned that Ochrotropis seemed to be more closely related to such typical species of Aphelidesmus as A. hermaphroditus Brölemann, 1898 (the type species), A. kervillei Brölemann, 1898 , A. divergens or A. frangens Chamberlin, 1950 . Species of Aphelidesmus Brölemann, 1898 show the most complex acropodital region which is divided into a distal and a proximal lamella. Jeekel (2000) stated that Ochrotropis differed from other genera of Aphelidesmidae by having an even more complex tibiotarsus (= acropodite), with the tibiotarsal lamella divided into LP3 (formerly b) and a distal lamella (= a). Additionally, he noted that the distal lamella was twisted around the axis of the tibiotarsus, and the femur was generally distinctly longer than the prefemur, corroborating this with the illustration of the type specimen ( Fig. 46E, F View FIGURE 46 ). On the other hand, the characteristics observed by Jeekel also agree with those observed in specimens from Trinidad & Tobago ( Fig. 45A–D View FIGURE 45 ). We compared the specimens with the original description ( Chamberlin 1918) and the later redescription ( Loomis 1934) of A. divergens , as well as the original description of A. guianensis by Chamberlin (1923) and the later redescription of O. guianensis by Jeekel (2000). All those specimens revised have the well-defined characteristics observed in Haematotropis such as the presence of anterolateral teeth on rings 2–4 ( Fig. 2F View FIGURE 2 ) and the conformation of the gonopods, with the median region expanded and cup-shaped in ventral view, and a concave ventral region ( Fig. 45D View FIGURE 45 ).

We have analyzed specimens of Aphelidesmus divergens from Trinidad and of O. guianensis from Guyana ( Fig. 46A–D View FIGURE 46 ) with lateral margins of ring 2 not projected posteriad and the gonopod with the distal region of the acropodite slightly sinuous, not bifurcate, bivalve shell–shaped, and curved ventrally. Therefore, O. guianensis is proposed herein as a junior subjective synonym of A. divergens .

Distribution. Guyana, Trinidad & Tobago ( Fig. 50 View FIGURE 50 ).