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Download Full Article 930.5KB .Pdf File Memoirs of the Museum of Victoria 54: 207-220 (1994) 30 June 1994 https://doi.org/10.24199/j.mmv.1994.54.10 REVISION OF THE GENUS PLATYCOLASPIS JACOBY (COLEOPTERA: CHRYSOMELIDAE: CRYPTOCEPHALINAE) By C. A. M. Reid Division of Botany and Zoology, Australian National University, GPO Box 4, Canberra, ACT 2601, Australia Abstract Reid, C. A. M., 1994. Revision of the genus Platycolaspis Jacoby (Coleoptera: Chrysomel- idae: Cryptocephalinae). Memoirs of the Museum of Victoria 54: 207—220. The genus Platycolaspis Jacoby, hitherto placed in Eumolpinae, is redescribed in the Cryp- tocephalinae. This south-east Australian genus includes five species, four of which are new: P. alpina sp. nov., P. australis Jacoby, P. lamingtonensis sp. nov., P. mcquillani sp. nov. and P. pubescens sp. nov. The genus has affinities with Semelvillea Reid. Adults of Platyco- laspis species feed on flowers of Acacia or on Nothofagus foliage. Introduction (Erber, 1968), which may show specific differ- ences. slight differ- The genus Platycolaspis Jacoby was original- The female rectum shows ences between species but is relatively invariable ly tentatively placed in the Colaspini, at generic level. It is differentiated into dorsal Eumolpinae, where it has remained (Seeno and and ventral halves with areas of sclerotisation on Wilcox, 1982). It was described from specimens the external surface (sclerites) and sensilla and sent for identification by Lea. However other rows of teeth (forming chitinpolsters) on the inner material of Platycolaspis seen by Lea (Museum nomenclature used here for these of Victoria and South Australian Museum) surface. The structures was devised by Erber (1968). The includes specimens labelled by him 'allied to generic redescription given here includes details Cryptocephalus pauperculus' and 'note abdom- of head and thoracic anatomy based on dissec- inal fovea' and it seems that Lea was aware of its tions of P. australis Jacoby, P. mcquillani sp. affinities to the Cryptocephalinae. For placement nov. and P. pubescens sp. nov. in Cryptocephalinae, the structures of the female, Plants were identified by reference to Coster- the male genitalia and the case-bearing larva (not mans (1981). described here) are decisive. The material used in this study is deposited at The genus Platycolaspis is redescribed below the following institutions: Australian National and compared with other genera in the Crypto- Insect Collection, Canberra (ANIC); Natural His- cephalinae, especially Semelvillea Reid. The five tory Museum, London (BMNH); Bernice P. species are described. The relative abundance of Bishop Museum, Hawaii (BPBM); Griffith Uni- material of four species is partly due to recent versity Insect Collection (GUIC); Museum of ecological surveys in Tasmania and Lamington Victoria, Melbourne (NMV); South Australian National Park. Museum, Adelaide (SAM); Insect Collection, Methods. Dissections were made from dried Agriculture Department of Tasmania, Hobart material after separating the abdomen in water, (TAIC); University of Queensland Insect Col- soaking this in cold dilute KOH for 2-3 hr and lection, Brisbane (UQIC). then washing in water. The general morphology Platycolaspis Jacoby of Cryptocephalinae is typical of Chrysomelidae, structures but there are a few internal abdominal Platycolaspis Jacoby, 1908: 27. (in Eumolpinae; type peculiar to Cryptocephalinae, which appear use- species: Platycolaspis australis Jacoby, by monotypy). — ful for generic or species discriminations. The Clavareau 1914: 34. — Seeno and Wilcox, 1982: 58. male has an ejaculatory guide (Karren, 1966) for Diagnosis. Cryptocephalinae (sensu stricto) of the flagellum in the median lobe of the aedeagus, vis- 1.4-3.0mm; antennal segments with basiconic which is greatly reduced in Platycolaspis but sensilla scattered, not concentrated in apical ible through the thin walls of the median lobe. discs; eye evenly and strongly convex, canthus The ovipositor is abruptly foreshortened and not developed (Fig. 4); pronotal disc with valvifer, coxite and stylus are fused into a single transverse impression, at least at sides, blade-like and partially transparent vaginal palp median 208 C. A. M.REID and hind margin without teeth (Figs 1-3); pro- apex; procoxal cavity narrowly open (gap coxal cavities open or closed by prosternal between hypomeron and prosternal process less process touching or slightly overlapping than length of hypomeral lobe), or closed by hypomeron (Figs 11-13); scutellum abruptly overlap or touching of prosternal process on declined anteriorly (Figs 1-3); elytral interlock- hypomeron; scutellum abruptly elevated from ing grooves evanescent and recurved before mesoscutum, elongate with slightly broader base apex; abdomen covered by elytra, at least in than truncate apex, or equilateral-triangular with males; claws appendiculate (Fig. 19); tergites rounded apex; mesoscutum with neither lateral weakly sclerotised, soft and flexible; male with patches of microchaetae, a longitudinal median sternites V and VI fused; median lobe of aedea- ridge nor a broad stridulatory file; elytra (Figs gus with simple apex (Figs 20, 22-27); ejacula- 1-3,9-10, 14-15) 2.5-3.0 times length of prono- tory guide simple, elongate-conical; spermathe- tum, subparallel-sided for basal half; apex of ely- ca with elongate collum (Figs 33-39); kotpresse tral sutural locking mechanism evanescent before with ventral sclerite laterally extended (Figs apex, the dorsal ridge recurved on the elytra; 40-44). punctation of elytra confused or subseriate on disc; epipleuron gradually attenuate, not reaching Description. Habitus (Figs 1-3). Size apex, with a row of punctures; mesosternal 1.4-3. 0mm; body moderately cylindrical but process narrow and truncate; wing venation head, prothorax and hindbody distinguishable; reduced (Fig. 16), basal marginal vein of R-cell colour of dorsum various shades of yellowish- absent or incomplete and anal area with faint or reddish-brown, venter similar but may be part- indication of elongate basal cell, oval apical cell ly black; without metallic reflection; dorsum and 2 radiating veins, outermost free; metaster- glabrous or pubescent. num not convexly swollen ventrally, sides Head (Fig. 4): relatively broad because of con- strongly punctured, dull, disc sparsely and weak- vex eyes, projecting from prothorax; vertical ly punctured, shining; metendosternite (Fig. 17) punctation dense, tending to rugose-strigose, with basal stalk narrow, as long as lateral arms, interspaces c.l puncture diameter or less; eyes without strong median projection and without lat- evenly convex, relatively small, distance between eral lobes or lamellae; all femora of similar size, always greater than 1.5 times eye length; inner thin, without ventral keel; tibiae unkeeled and margin of eye without canthus, straight or feebly apical spurs absent; all tarsal segments (Fig. 18) concave; sides of clypeus divergent to apex; relatively short and dorsally convex, segment 3 antennae (Fig. 7) with all segments elongate, of anterior tarsus slightly transverse; claws 5-1 1 approximately equally long, 7-1 1 expand- appendiculate (Fig. 19). ed; antennal length 0.4-0.6 body length; anten- Abdomen (external) (Fig. 6): tergites thin, nal segments with basiconic sensilla scattered, weakly sclerotised and not reaching sternites; not in apical pits; labrum (Fig. 8) quadrate, with pleurites absent, spiracles free in basal tergites; 3 or more pairs of dorsal setae and less than 10 sternites weakly and sparsely punctured, rela- pairs of basiconic sensilla on epipharynx; last tively shining, but transversely microsculptured; segment of maxillary palpi simply conical to sides of sternite III ridged at base of lateral lobe, expanded at apex, with 3-4 digitiform sensilla; ridge 0.5-0.75 length of sternite, other sternites mandible with 2 short apical teeth, a blunt medi- unridged; male sternites V and VI connate, but an tooth on internal edge and several short exter- sternite VII not indented; females with sternites nal setae; apical segment of labial palp shaped as V and VI free and sternite VII with large shallow maxillary palp. egg-hollow lacking apical indentation. Thorax: Prothorax (Figs 1-3, 5, 9-13): prono- Male genitalia (Figs 20-27): median lobe shal- tum broadest at middle of sides, which are round- lowly curved in profile, with generally short and ed to strongly angulate and only slightly con- sparse dorsal and ventral setae; ejaculatory guide tracted at apex; lateral margins of pronotum reduced to a narrow cone with central channel strongly bordered to explanate; disc strongly and and basal diaphanous vesicle (difficult to distin- closely punctured, with median transverse guish); tegmen (Fig. 21) U- or V-shaped with depression at least at sides; anterior corner setae expanded sides and truncate base. set on anterior margin not on explanate border, Female genitalia and oviposition complex posterior setae at corners; prosternal process (Figs 28—45): vaginal palp (Figs 28-32) with api- quadrate to elongate, narrowed in middle (width cal border wholly sclerotised and rounded to less than 0.5 coxal cavity width) and expanded at slightly concave; spermatheca (Figs 33-39) with REVISION OF THE GENUS PLATYCOLASPIS JACOBY 209 moderately long collum and U- or slightly V- are dropped to the ground in scatoshells. shaped receptaculum; kotpresse (Figs 40-45) with laterally expanded ventral sclerite, conspic- Remarks. Platycolaspis shows typical adult mor- uous and usually triangular dorsal sclerites reach- phological attributes
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