日本産 Hystrichopsyllidae 科の蚤の 2 新種について(第 5 回大会講演要旨)

Abstract

The genus Palacopsylla is typically a parasite of small insectivores (Soricoidea) of the Palaearctic Region, and this is the first record for Palaeopsylla from Japan. Palaeopsylla nippon is most closely related to P. remota Jordan, 1929, a species which occurs to the east and south of Japan. Male: Chaetotaxy of head as illustrated (P1. 1, A). The long, prominent setae are constant, but the minute, more or less scattered setae vary slightly in number and position. Five long preantennal setae: three above the eye and two larger setae below (or in front of) the eye. Eight long postantennal setae: a diagonal (anterior) row of three, a marginal (posterior) row of three, and two long setae on the upper margin of the antennal groove. Antennae with numerous fine setae on the mesal side of the club; second segment of antennae with setae extending for no more than one-third the distance of the club (P1. 2, A). Frontal tubercle above level of eye, acute, and directed upward. Eye reduced, at the top of the genal ctenidium. Pronotal ctenidium (P1. 1, A) of 9-10 spines per side. Cervical sclerite moderate in length, with a ventral concavity. Mesonotum (P1. 1, D) with one to three pseudosetae per side, beneath the collar; no such pseudosetae on metanotum. No pleural ridge on pleuralsternal plate. Mesepisternum with three or four setae of varying lengths; mesepimerum with three long setae. Metepisternum with one and metepimerum with four long setae. Apical spinelets on abdominal terga: I, 2 (or 3); II, 2 (1-3); III, 2 (1-3); IV, 2 (or 1); V, 1 (or 2); VI, 0 (or 1). Three antepygidial bristles: middle the longest and upper the shortest. Fifth tarsal segment on each leg with six pairs of plantar bristles: a basal, ventral pair, four lateral pairs, and apical ventral pair (P1. 2, C and D). Coxa III with 2-4 long setae, but without an inner patch of spinelets. Clasper and moveable finger as illustrated (P1. 2, F and G). Especially characteristic are the rather heavily sclerotized apical angle of the clasper (P1. 2, G) and the subbasal projection on the anterior margin of the finger (P1. 2, F). Penis rod directed upward, not completing one turn. Sternite VIII broadly rounded with no lobes, sinuses or marginal setae, but with two or three basal setae. Femzale: Chaetotaxy essentially as in male, but slightly fewer setae in some regions. Only one long seta on the upper margin of the antennal groove, and anterior seta (of the male) being absent. Second segment of the antenna bearing two long setae on the upper edge (PI. 2, B); mesal side of club with no setae. Genal ctenidium as in male. Pronotal ctenidium of 9-10 spines, as in male. Two pseudosetae under collar of mesonotum; none on metanotum. Thorax as in male. Apical spinelets of abdominal terga slightly fewer than in male: I, 2 (or 3); II, 2 (or 3); III, 2; IV, 1 (or 2); V, 1 (or 0); VI, 0 (or 1). Antepygidial bristles (P1. 1, B) as in male. Spiracular opening of tergite VIII about half as large as pygidium. Spermatheca (P1. 1, C) with head slightly concave ventrally and convex dorsally; tail about as long as head, and curved slightly caudally at apex. Sternite VII (P1. 1, B and C) with a long but rounded basal lobe, bordered both dorsally and ventrally by a sinus. Anal stylet (P1. 2, E) with a long straight apical seta and two, short subapical setae. Sternite VIII (P1. 1, B) digitate, bluntly rounded distally, with four to six apical setae on each side: two apical setae and two subapical, heavier setae. Tergite VIII with about six setae on caudal margin, basally.