Rudolfina newtoni, 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 : 32-35

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scientific name

Rudolfina newtoni

sp. nov.

Rudolfina newtoni sp. nov.

Figs 14–15 View Fig View Fig , 21C View Fig


The species name is a patronym for Dr Alfred Newton, the collector of all known specimens of this species.

Material examined


MEXICO • ♂; Oaxaca, 4.1 mi. W of Jct. Mex. 175- Yuvila Rd ; 9300 ft a.s.l.; 8–19 Aug. 1973; A. Newton leg.; oak-fir-pine forest; FMNH debu01086218.


MEXICO – Oaxaca • 6 ♂♂, 4 ♀♀; same collection data as for holotype; DEBU 5 ♂♂, 4 ♀♀; same collection data as for holotype; FMNH 1 ♂, 1 ♀; 25 mi. N of Ixtlan ; 17°33′0″ N, 96°31′12″ W; 9100 ft a.s.l.; 23–29 Jul. 1971; A. Newton leg.; oak-pine, human dung; FMNH GoogleMaps 3 ♂♂, 1 ♀; 20 mi. N of Ixtlan ; 2835 m a.s.l.; 24–27 Jul. 1971; A. Newton leg.; oak-pine; DEBU 1 ♀; 28 mi. N of Ixtlan ; 9500 ft a.s.l.; 23–29 Jul. 1971; A. Newton leg.; pine-heath, human dung; DEBU 4 ♂♂, 4 ♀♀; 2.0 mi. W of Jct. Mex. 175- Yuvila Rd ; 9500 ft a.s.l.; 8–19 Aug. 1973; A. Newton leg.; oak-pine, dung; DEBU 4 ♂♂, 5 ♀♀; same collection data as for preceding; UNAM 2 ♀♀; 1.7 mi. W of Jct. Mex. 175- Yuvila Rd ; 2865 m a.s.l.; 9–19 Aug. 1973; A. Newton leg.; mesic oak, fish trap; DEBU 7 ♂♂, 6 ♀♀; 1.4 mi. W of Jct. Mex. 175- Yuvila Rd ; 9300 ft a.s.l.; 9–19 Aug. 1973; A. Newton leg.; mesic oak forest; DEBU 3 ♂♂, 2 ♀♀; same collection data as for preceding; dung; DEBU .


BODY. Length: 1.6–2.0 mm. Eye height 1.5 × genal height. Head with 4 interfrontal setae and row of 6–7 small setulae on inner margin of orbital plate. Gena with 2 strong setae and 6–8 smaller setulae. Acrostichal setulae in 6–8 rows. Costagial seta extending slightly beyond humeral break. Second costal sector ~1.2 × as long as third. Length of M 1 between crossveins dm-cu and r-m 2.0× dm-cu; CuA 1 stub vein ~4.0× M 1 stub vein. Male mid femur with 20–21 strong setae in ventrobasal cluster. Male mid tibia with ventral comb of 8 robust setae on apical ½.

MALE ABDOMEN ( Fig. 14 View Fig ). Sternite 5 posterior margin with two distinct teeth on each side of large emargination; emargination forming a broad circular desclerotized area, ~⅓ width of sclerite and extending anteriorly ~¾ of length; margin of emargination with numerous setae on posterior ⅔. Transverse part of sternite 6 arcuate. Epandrium with pair of long mediolateral setae, with 2–3 smaller pairs lateral to large pair; subanal plate narrowly continuous below anal opening. Surstylus (in lateral view) with anterior lobe reduced to small basal swelling; posterior lobe elongate, length ~4.0 × basal width, tapering to narrowly rounded apex; bent posteriorly near basal ¼, with 4–5 setae on both ventral and dorsal surfaces. Cerci quadrate, weakly differentiated from each other and from epandrium, with pair of ventromedial setae. Postgonite narrow, slightly sinuate, with 4 small dorsal setulae on apical ½. Dorsal sclerite of distiphallus ( Fig. 14 View Fig D–F) without swellings and not extending beyond apex of acrophallus.

FEMALE ABDOMEN ( Fig. 15 View Fig ). Posterior margin of tergite 7 entire. Medial part of tergite 8 short and kidneyshaped, with posterior margin emarginate. Epiproct triangular, elongate, with mid-line desclerotized. Cercus half as long as epiproct, with flattened apical seta; narrowly fused anterolaterally to epiproct. Posterior margin of sternite 7 entire or slightly arcuate. Spermathecae inverted cup-shaped (with duct, appearing mushroom-shaped) and wrinkled; sclerotized portion of ducts ~2.0 × length of spermatheca; common duct of paired spermathecae poorly sclerotized.


This species is distinguished from other Rudolfina by characters of the surstylus and male sternite 5. The female epiproct is intermediate in shape between the strongly modified epiproct found in the R. exuberata group and the unmodified epiproct of other Rudolfina .


Field Museum of Natural History


Ontario Insect Collection, University of Guelph


Universidad Nacional Autonoma de Mexico