Caliroa bibaiensis Hara 2020, sp. nov.
Creators: name: Hara, Hideho
name: Ibuki, Shinichi
Publisher: name: Zenodo
Year: 2020
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Hymenoptera
Tenthredinidae
Caliroa
Caliroa bibaiensis

description: Caliroa bibaiensis Hara sp. nov.
(Figs 1C, D, K, L, 3E, O, 4D, 5B, O, 6 E–I)
Description: female. Length 4.0–5.0 mm. Black, shiny with colorless reflection (Fig. 1C, D). Labrum brown to dark brown. Mandible black, apically reddish brown. Palpi black, often dark brown apically. Legs black; fore and middle legs yellow from apices of femora to tarsi, with tibiae and tarsi often brown to dark brown apically; hind leg yellowish white on basal half of tibia and basal half of first tarsomere; tibial spurs yellow; claws brown. Wings mostly colorless transparent; forewing slightly blackish on cells C and Sc and usually below stigma; veins and stigma black.
Postocellar area 1.3–1.5 × as wide as length behind lateral ocellus, without anterior groove. Clypeus deeply roundly emarginated on ventral margin (Fig. 3E); depth of emargination 0.4–0.5 × median length of clypeus. Malar space linear, about as wide as or slightly wider than facet of eye, without setae. First flagellomere 0.9–1.0 × as long as second and third flagellomeres combined (Fig. 3O); apical four flagellomeres combined 1.0–1.1 × as long as first flagellomere. Forewing with joint of vein Rs with crossvein 2r-rs located at apical 0.30–0.41 of anterior margin of cell 1Rs2 (Fig. 1C); basal corner of cell 1M slightly acute. Hind wing with joint of vein 1A and crossvein cu-a located somewhat apical to apex of cell 1A (Fig. 4D); vein 1A not or slightly extending apically beyond joint with crossvein cu-a; crossvein 2r-m present or absent; crossvein m-cu absent.
Punctures mostly minute or inconspicuous. Head and thorax mostly smooth. Mesoscutellum posterolaterally with one or some relatively large punctures along posterior margin. Mesoscutellar appendage mostly setose (Fig. 5B). Dorsum of abdomen reticulately microsculptured (Fig. 5O).
Lance (Fig. 6 E–G) with dorsal margin slightly angularly serrate apically. Lancet (Fig. 6E, H, I) with 16–17 serrulae; ctenidia slightly darkened, ventrally extending to or near ventral margin of lancet; middle serrulae each with two to three anterior teeth and four to sixth posterior teeth; areas between middle serrulae slightly convex, wider than adjacent serrula.
Male. Unknown.
Immature stages. Final feeding instar (semifinal instar) larva (Fig. 1K, L): length 9 mm; pale yellow with slime transparent; head black; legs black.
Material examined. Holotype (Figs 1C, D, 3E, O, 4D, 5O, 6E): ♀, “ JAPAN, HOKKAIDO, Sorachi, Bibai, Koshunai, coll. larva 24. VII. 2011, mat. 26–29. VII., em. 28. V. 2012, Host: Crataegus chlorosarca, H. Hara ”. Paratypes: 5♀, same data as holotype, but larva coll. 28. VII. 2008, mat. 11. VIII., em. 16–24. VI. 2009; 9♀, same data as holotype, but em. 28–31. V. 2012.
Etymology. The species epithet is derived from the locality and is an adjective.
Distribution. Japan: Hokkaido.
Bionomics. Host plant: Rosaceae: Crataegus chlorosarca Maxim.
Late instar larvae were collected in late July. They solitarily fed on the under surface of a leaf (Fig. 1K, L), although two or three larvae were often found on one leaf. In the rearing room, they matured and entered the soil during late July and middle August and became adults in May or June in the following year. This sawfly has one generation a year.
Remarks. In eastern Palearctic and Oriental species, C. bibaiensis is similar to C. parvula Wei, 1997 described from northeastern China in having a black body without colored reflection, a basally pale marked hind tibia, a mostly colorless transparent wings, a hind wing with a crossvein cu-a fused with a vein 1A apical to the apex of a cell 1A and microsculptured abdominal terga, but differs from the latter species by a postocellar area 1.3–1.5 × as wide as length behind lateral ocellus [about 2 × in the latter species], apical four flagellomeres combined 1.0–1.1 × as long as the first flagellomere (Fig. 3O) [distinctly longer in the latter species]. Their lancets also differ (compare Fig. 6I with fig. 10 in Wei, 1997).
In the key to western Palearctic species by Lacourt (2002), C. bibaiensis may go to C. tremulae Chevin, 1974, but it is distinguished from that species in having the following features [we examined two specimens of C. tremulae: 1♀, “Fennia, N. Helsinki, Villinki, 18. 7 1952, leg. O. Ranin”; 1♂, same data but “ 27. 7 1958 ”]: first flagel- lomere 0.9–1.0 × as long as second and third flagellomeres combined (Fig. 3O) [0.7 × in C. tremulae]; crossvein cu-a fused with vein 1A apical to apex of cell 1A in hind wing (Fig. 4D) [basal to apex of cell 1A in C. tremulae]; lancet with ctenidia not narrowing ventrally and areas between serrulae slightly convex (Fig. 6I) [ctenidia distinctly narrowing ventrally and areas between serrulae distinctly convex in C. tremulae (fig. 24 in Lacourt, 2002)].
In the key to Nearctic species by Smith (1971), C. bibaiensis goes to the couplet 9 consisting of C. liturata MacGillivray, 1909 and C. petiolata Smith, 1971, but it is distinguished from C. liturata by the serrulae of a lancet distinctly asymmetric (Fig. 6E, H, I) [almost symmetric in C. liturata (fig. 65 in Smith, 1971)] and from C. petiolata Smith, 1971 by wings mostly colorless transparent [lightly infuscated on basal two thirds, hyaline on apical third in C. petiolata] and the serrulae of a lancet with rough teeth (Fig. 6E, H, I) [with fine teeth in C. petiolata (fig. 66 in Smith, 1971)].
description: Published as part of Hara, Hideho & Ibuki, Shinichi, 2020, Caliroa slug sawflies of Japan (Hymenoptera, Tenthredinidae), pp. 301-333 in Zootaxa 4768 (3) on pages 306-312, DOI: 10.11646/zootaxa.4768.3.1, http://zenodo.org/record/3783994