Aporodesmella securiformis, Golovatch, Sergei I., Geoffroy, Jean-Jacques & VandenSpiegel, Didier, 2014

Golovatch, Sergei I., Geoffroy, Jean-Jacques & VandenSpiegel, Didier, 2014, Review of the millipede family Trichopolydesmidae in the Oriental realm (Diplopoda, Polydesmida), with descriptions of new genera and species, ZooKeys 414, pp. 19-65 : 36-38

Aporodesmella securiformis sp. n. Figs 3, 4

Type material.

Holotype ♂ (MNHN JC 355), Vietnam, Kien Giang Province, Kien Luong, Hon Chong, Nui Bai Voi, 104.618E, 10.218N, soil, Berlese extraction, 02.06.2008, leg. L. Deharveng & A. Bedos (Vn08-045).

Paratypes: 1 ♂, 4 ♀ (MNHN JC 355), 1 ♂, 1 ♀ (ZMUM ρ 2346), 1 ♂ (SEM), same locality, together with holotype; 2 ♂, 1 ♀ (MNHN JC 355), 1 ♂ (SEM), same province, Kien Luong, Hon Chong, Nui Hang Tien, litter & soil, Berlese extraction, 02.06.2008, leg. Ly Ngoc Sam (Vn08-065); 3 ♂ (MNHN JC 355), 1 ♂ (SEM), same data (Vn08-066).

Name.

To emphasize the axe-shaped solenophore.

Diagnosis.

Differs from congeners except Aporodesmella similis sp. n. by the presence of a remarkable dorsoparabasal stump on ♂ antennomere 6, from Aporodesmella similis sp. n. and other congeners by a peculiar, unusually short, axe-shaped solenophore and a simple, lanceolate, shorter and stout solenomere.

Description.

Length of adults ca 2.8-2.9 mm (♂, ♀), up to 3.0 mm (♀), width of midbody pro- and metazonae 0.15 and 0.2 (♂, ♀), up to 0.2 and 0.25 mm (♀), respectively. Coloration in alcohol uniformly pallid, tegument translucent.

Body moniliform, with 19 segments (♂, ♀). Tegument mainly dull, at most slightly shining, texture very delicately alveolate and microgranulate. Head without modifications, densely pilose throughout except occiput; epicranial suture superficial and thin; genae squarish (Fig. 3A, D, G); gnathochilarium narrow, setae dense and short (Fig. 4A); isthmus between antennae about as broad as diameter of antennal socket (Fig. 3G). Antennae very short, reaching only behind collum (♂, ♀) when stretched dorsally, not geniculate, strongly clavate due to an abruptly and particularly enlarged antennomere 6, the latter with a usual, tight, distodorsal group of numerous bacilliform sensilla, but in ♂ also with a large, highly conspicuous, dorsoparabasal, rounded stump (s); antennomere 5 with a loose distodorsal group of only a few tiny sensilla, 7th with a tiny mid-dorsal knob (Figs 3G, J, 4A).

In width, head> segment 2> collum = segment 3 = 4> 5(6) = 16 (♂, ♀), thereafter body gradually tapering towards telson (Fig. 3 D–F). Paraterga wanting, metazonae subcylindrical, dorsum strongly convex (Fig. 3 A–I). Ozopores totally absent (Fig. 3A, B, D–F, K). Collum subovoid, each following metatergum mostly with 4+4 rather long, slightly blunted, subclavate to subbacilliform, thickened and longitudinally ribbed setae arranged in 3 transverse regular rows and borne on minute knobs (Fig. 3 A–F, K–M). Stricture between pro- and metazonae rather wide and shallow, scaly like rear part of prozonae. Limbus very fine and microcrenulate (Fig. 3L). Pleurosternal carinae thin lines (Fig. 3A, B, H). Epiproct short, conical, directed caudoventrally; pre-apical papillae small (Fig. 3C, F, I). Hypoproct subtrapeziform, caudal setigerous papillae evident and well separated (Fig. 3I).

Sterna without modifications, rather broad and sparsely setose (Fig. 3H). Legs short, ca 1.3-1.4 (♂) or 1.1-1.2 times as long as midbody height (♀); ♂ prefemora, femora, postfemora and tibiae clearly incrassate, tarsi longest, slender, sphaerotri chomes missing (Figs 3A, B, 4B), claws simple, slightly curved (Fig. 4B, C); ♂ coxae 2 with short, membranous, cylindrical gonapophyses (Fig. 3G).

Gonopod aperture transversely oblong-oval, slightly subcordate, taking up most of ventral part of metazonite 7 (Fig. 4D). Gonopods (Fig. 4 D–G) simple, with globose, scaly, medially fused coxae carrying a few setae on ventral face and a normal cannula mesally. Telopodites nearly straight, mostly exposed, in situ held parallel to each other, contiguous medially, largely unipartite due to prominent, rather densely setose prefemoral parts, rather short and stout, only distal quarter distinctly divided into a peculiar, axe-shaped, lateral solenophore (sph) and a smaller, anteriorly lying, sublanceolate solenomere (sl) directed slightly laterad. Seminal groove running entirely mesally, terminating on top of sl.