Rudolfina pauca, Paiero & Marshall, 2020

Paiero, Steven Mark & Marshall, Stephen A., 2020, A revision of the genus Rudolfina Roháček (Sphaeroceridae: Limosininae), European Journal of Taxonomy 593, pp. 1-48 : 35-38

Rudolfina pauca sp. nov.

urn:lsid:zoobank.org:act:F085E96F-6CCB-49B0-83B8-503F18F1B472

Figs 16–17 , 21C

Etymology

The species name is the Latin for ‘few’. Compared to the closely related R. exuberata sp. nov., which occurs throughout the Neotropical region and has been collected at over a hundred different sites, R. pauca sp. nov. has been infrequently collected and remains known from only five sites in Mexico and Guatemala.

Material examined

Holotype MEXICO • ♂; México, 1 mi. NE of Tenancingo ; 7100 ft a.s.l.; 31 Aug.–6 Sep. 1971; A. Newton leg.; oak-pine-madrono, human dung; FMNH debu01086244.

Paratypes GUATEMALA – San Marcos • 1 ♀; San Antonio Sacatepéquez; 14°58′ N, 91°44′ W; 8000 ft a.s.l.; 29 Sep. 1986; M.J. Sharkey leg.; DEBU .

MEXICO – Hidalgo • 1 ♂, 1 ♀; 4 mi. W of Tulancingo ; 7600 ft a.s.l.; 1–6 Jul. 1971; A. Newton leg.; human dung; DEBU . – México • 6 ♂♂, 10 ♂♂; same collection data as for holotype; FMNH • 8 ♂♂, 10 ♂♂; same collection data as for holotype; DEBU • 2 ♀♀; 3 mi. SW of Tenancingo , at km 52¼; 7100 ft a.s.l.; 31 Aug.–6 Sep. 1971; A. Newton leg.; oak-juniper, human dung; DEBU • 2 ♂♂, 1 ♀; same collection data as for preceding; UNAM . – Morelos • 1 ♀; 8 mi. S of Tres Cumbres ; 7400 ft a.s.l.; 29 Aug.–4 Sep. 1971; A. Newton leg.; oak/pine forest, dung; DEBU .

Description

BODY. Length: 1.4–1.9 mm. Eye height 1.3 × genal height. Head with 4 interfrontal setae and row of 8–10 small setulae on inner margin of orbital plate. Gena with 1 strong seta and 8 smaller setulae. Acrostichal setulae in 6–8 rows. Costagial seta extending to humeral break; second costal sector shorter than third (20:35); length of M 1 between crossveins dm-cu and r-m 1.2 × dm-cu; CuA 1 stub vein ~2.0 × M 1 stub vein. Male mid femur with 4–5 weak setae in ventrobasal cluster. Male mid tibia with ventral comb of 11–13 robust setae on apical ½.

MALE ABDOMEN ( Fig. 16 ). Sternites 3–4 evenly haired. Posterior margin of sternite 5 with lobes elongate, projecting posteriorly; emargination extending anteriorly ~¼ length of sternite, ~¼ width of sternite at posterior margin. Transverse part of sternite 6 weakly arcuate. Epandrium with 2 long ventrolateral setae and scattered setulae; subanal plate narrowly continuous below anal opening. Surstylus (in lateral view) trilobed, with anterior lobe rounded and bare, middle lobe small, rounded and with 4–6 distal setae apically, and posterior lobe posteriorly projecting and rounded, with 1 large, flattened seta and 2–3 regular setae apically. Cercus small and conical, projecting posterolaterally, with 2 apical setae. Postgonite slightly capitate or oar-shaped, with apex ventrally emarginate; 3–4 setulae present along dorsal surface. Dorsal sclerite of distiphallus ( Fig. 16 D–F) without swellings and not extending beyond apex of acrophallus.

FEMALE ABDOMEN ( Fig. 17 ). Posterior margin of tergite 7 medially emarginate. Medial part of tergite 8 elongate, rectangular (length ~3.0× width) and poorly sclerotized; overlapping basal projection of epiproct. Epiproct tulip-shaped, with elongate narrow anterior extension. Cercus reduced, shorter than apical flattened seta; fused anterolaterally to epiproct. Spermathecae acorn-shaped, with a small, smooth distal bulb, a wrinkled medial section and a smooth basal section; paired spermathecae with stems as long as spermatheca; common duct of pair short, ~1/6 length of stems.

Remarks

See comments under R. exuberata sp. nov.

Figures

Fig. 16. Rudolfina pauca sp. nov., male terminalia (debu1086247). A. Epandrium, surstylus and cercus, caudal view. B. Same as preceding, lateral view. C. Sternite 5, ventral view. D. Phallus, postgonites and phallapodeme, dorsal view. E. Phallus, postgonites, hypandrium and phallapodeme, dorsolateral view. F. Same as preceding, lateral view. Scale bars: A–B = 0.10 mm; C = 0.10 mm; D–F = 0.05 mm.

Fig. 17. Rudolfina pauca sp. nov., female terminalia (debu01086258). A. Terminal abdominal segments, dorsal view. B. Same as preceding, lateral view. C. Same as preceding, ventral view. D. Spermathecae. Scale bars: A–C = 0.20 mm; D = 0.05 mm.

Fig. 21. Distribution of species of New World Rudolfina Roháček, 1987. A. R. cavernicola Marshall & Fitzgerald, 1997, R. digitata Marshall, 1991 and R. tumida sp. nov. B. R. bucki sp. nov., R. megepandria sp. nov. and R. howdeni sp. nov. C. R. pauca sp. nov., R. pilosa sp. nov., R. newtoni sp. nov. and R. remiforma sp. nov. D. R. exuberata sp. nov.