Decapauropus glomeratus, Scheller, Ulf, 2013

Scheller, Ulf, 2013, Three new species of Pauropoda (Myriapoda) from Brazil with description of a new genus in Diplopauropodidae, Adelphopauropus, Zootaxa 3664 (1), pp. 69-77 : 71-73

Genus Decapauropus Remy, 1931

Decapauropus glomeratus n. sp. Figs 9–17

Type locality. Brazil, Central Amazonia, secondary forest near the Tarumã Mirím River,

Type specimen. Holotype: ad. with 9 pair of legs (Ƥ), January 30, 1983, leg. J.M.G. Rodrigues. – 1 specimen.

Non-type specimen. Same data as holotype, 1 juvenile with 3 pairs of legs. – 1 specimen.

Diagnosis. Disregarding the occurrence of the setae b 3 on the pygidial sternum and the shape of the bothriotricha T 3 the new species is close to a species in Allopauropus , A. rodriguesi Scheller (1994) from near the Tarumã Mirím River near Manaus. There are distinct similarities in some head characters, in the setae on the basal segments of the legs, the tergite VI and the short pygidial sternum. Good distinguishing features are the shape of the bothriotricha T 3, with spherical apical swelling, none in A. rodriguesi , the process of the collum segment, narrow and pointed anteriorly, not broad with anterior incision, and the characters of the anal plate, curved lateral margins, not straight, three pubescent posterior appendages, not two, and posteriolateral corners broad, not thin. However, the characters of the new species still give the impression of a species placed in wrong genus. It may indicate that the distinction between Allopauropus and Decapauropus has to be amended.

FIGURES 9 – 17. Decapauropus glomeratus n. sp., holotype ad. 9(Ƥ). 9, head, right half, tergal view. 10, left antenna, tergal view. 11, collum segment, median and left part, sternal view. 12, tergite VI, posteriomedian part and right posterior corner. 13, T 1. 14, T 3. 15, seta on trochanter of leg 9. 16, tarsus of leg 9. 17, pygidium, posteriomedian and left part, sternal view. Scale: a: 11, 13; b: 9, 14–16: c: 10, 12, 17.

Derivation of name. From the Latin glomus = ball, referring to the shape of the apical swelling of the bothriotrich T 3.

Description. Length. 1.03 mm.

Head (Fig. 9). All setae but a 3 in 2nd row, blunt, striate, posteriomedian setae somewhat clavate, posterolateral setae cylindrical. Relative lengths of setae: 1st row: a 1 =10, a 2 =11; 2nd row: a 1 =9, a 2 =16, a 3≈19; 3rd row a 1 = a 2 =8; 4th row; a 1 =10, a 2 =19: a 3 =13, a 4 =18; l-s etae not studied. The ratio a 1/ a 1 –a 1 in 1st row=1.3, 2nd row=0.4, 3rd row=0.5, 4th row=0.9. Temporal organs in tergal view broadest anteriorly, length 1.6 times as long as their shortest interdistance: distinct clavate pistil in posterior half, length of pistil almost 0.2 of the length of temporal organ. Cuticle glabrous.

Antennae (Fig. 10). Most of segment four hidden, seta p 2.2 times longer than p ´. Tergal seta p 1.3 times as long as tergal branch t. The latter branch fusiform, widest just outside middle, 2.6 times as long as greatest diameter, 1.2 times as long as sternal branch s, that branch 1.5 times as long as greatest diameter, widest in distal half, anterodistal corner distinctly truncate. Seta q as seta p of segment four, 1.2 times as long as sternal branch s. Relative lengths of flagella (basal segments included) and basal segments alone: F 1=100, bs 1=9(-10); F 2=57, bs 2=7; F 3=129(-131), bs 3=11. F 1 and F 2 4.0 and 1.6 times as long as t and s respectively. Distal calyces helmet-shaped, with short hairs, distal part of flagella axes fusiformly widened below calyces. Globulus g subspherical with short stalk, ≈10 bracts, capsule subspherical. Diameter of g 0.5 of the greatest diameter of t. Antenna glabrous.

Trunk (Figs 11, 12). Setae of collum segment (Fig. 11) simple, somewhat thickened in distal half, striate, sublateral setae 2.1 times as long as submedian setae. Sternite process narrow anteriorly; appendages cylindrical with broadened bases, caps flattened; process and appendages glabrous.

Setae on tergites short, cylindrical, blunt, striate, shortly pubescent, not lengthening posteriorly. Tergite I with 4+4 setae, tergites II-IV with 6+6 and VI with 4+2 setae. Posterior setae on tergite VI (Fig. 12) short, cylindrical, blunt, striate, curved inwards, shortly pubescent, length 0.2 of interdistance and 0.3 of the length of pygidial setae a 1.

Bothriotricha (Figs 13, 14). Relative lengths: T 1=100, T 2=105, T 3=91 and 96, T 4=102, T 5=140. Axes thin simple. Pubescence on proximal part of T 1– T 4 simple, straight, oblique hairs increasing in length outwards, pubescence more outwards longer, erect, branched distally (Figs 13, 14). T 3 (Fig. 14) with globular distal swelling covered with setae of the same type as on distal parts of T 1 –T 4; diameter of swelling 0.1 of the length of T 3. T 5 thin, with short pubescence.

Legs (Figs 15, 16). Setae on coxa and trochanter of leg 9 (Fig. 15) simple, cylindrical, blunt, striate. Tarsus of leg 9 (Fig. 16) straight tapering, 3.1 times as long as greatest diameter. Setae short, cylindrical, blunt, striate, proximal seta not fully 0.2 of the length of tarsus and 0.9 of the length of distal seta. Cuticle with short pubescence.

Pygidium (Fig. 17). Tergum. Posterior margin almost straight, two small posterior bulges just inside setae a 1; a - setae inserted near posteriolateral corners. Relative lengths of setae: a 1=10, a 2=10 and 11, a 3=31 and 34, st ≈5. as etae diverging, cylindrical, tapering distally, pubescence of oblique hairs distinct on a 1 and a 2, very short on proximal part of a 3, distal part of that seta densely striate, a 1 almost straight, a 2 and a 3 curved inwards. Distance a 1 – a 1 1.4 – 1.5 times as long as a 1 and distance a 1 –a 2 three times longer than distance a 2 –a 3.

Sternum. Posterior margin with two rounded, triangular, posterolateral lobes separated by deep broad indentation, three very small lobes just under anal plate; setae b 1 inserted at outer bases of posterolateral lobes. Relative lengths of setae (pygidial a 1=10): b 1 = 19–20, b 2=9. Setae b 1 cylindrical blunt striate, b 2 tapering diverging: b 1 as long as interdistance, b 2=0.9 of distance b 1 –b 2.

Anal plate narrowest anteriorly, with concave lateral margins, posteriolateral corners extended into broadly claw-like structures, these diverging and curved inwards, posterior margin with short median triangular bulge, from between bases of claw-like corners three thin straight clavate appendages, distal part covered with distinct pubescence, middle appendage shorter than diverging lateral ones.