Monolepta zonula Weise, 1916

Hazmi, Izfa Riza & Wagner, Thomas, 2022, Revision of Monolepta Chevrolat, 1836 from the Sundaland area (Coleoptera: Chrysomelidae: Galerucinae), Bonn zoological Bulletin 71 (2), pp. 139-176 : 155-157

Monolepta zonula Weise, 1916

Figs 24–26

Monolepta zonula Weise, 1916: 40 .

Replacement name for M. fasciatipennis Jacoby, 1892: 983 , a junior homonym of M. fasciatipennis Blackburn, 1888: 180 .

= Monolepta fasciatipennis Jacoby, 1892: 983 ( Weise, 1916) , replacement name for M. albofasciata Jacoby, 1889: 228 , a junior homonym of M. albofasciata Jacoby, 1884b: 235 .

Abdomen. Pale brown to reddish, strongly contrasting to the black metathorax.

Male genitalia. Median lobe of this species is comparatively small, parallel-sided in the basal two thirds and narrowed in the apical third ( Figs 23 Ca, Cc). Tectum is short, narrow in the middle, lanceolate ( Fig. 23 Ca). Ventral spiculae most likely weakly sclerotised and hardly visible lateral spiculae broad, simply curved structures ( Figs 23 Ca, Cb), median spiculae short, slender bristles ( Figs 23 Ca, Cb).

Type material. Syntypes: “ Bhamo , Birmania, Fea viii.1886 / Monolepta albofasciata Jac. / 1 st Jacoby Coll. / Type 18443” ( MCZH; Fig. 24 ), each a further syntype with the same data in MCGD and BMNH .

Further material examined. – Indonesia. 1 ex., Java Occ., MG Piepers ( RMNH) ; 2 ex., Sumatra, Manna , 4º27′ S / 103º01′ E, 1902, M. Knappert ( RMNH) ; 1 ex., Sarawak, Kuching, Bako NP, 1°42′ N / 110°28′ E, V.1999 , P. Votruba ( CJB) . – Malaysia. 19 ex., Malay Penin , Kuala Lumpur, 3º06′ N / 101º39′ E, Expd. Agrc. Dept. ( BMNH) ; 1 ex., Sandakan , 5º50′ N / 118º03′ E, C. V . Creagh , 1896 ( BMNH) ; 1 ex., Kuching , 1º31′ N / 110º20′ E, J. E. A. Lewis, 1910 ( BMNH) ; 1 ex., Penang, 5º25′ N / 100º29′ E ,

Thorax. Pronotum very finely punctuated, usually pale yellow rarely up to pale brown, transversely convex, and the sides slightly rounded. Pronotal width 1.05–1.55 mm (mean 1.32 mm), ratio length to width 0.61–0.64 (mean 0.63). Scutellum, meso- and metathorax black. Elytron finely punctuated, black with one yellow spots in the middle on disc ( Fig. 25A ), often apical two thirds along the suture reddish ( Fig. 24b ), rarely also with dark-reddish spot at humerus. Elytral length 2.75–3.85 mm (mean 3.34 mm), maximal width of both elytra together 2.00– 2.80 mm (mean 2.43 mm), ratio of maximal width of both elytra together to length of elytron 0.71–0.75 (mean 0.73). Legs yellow to yellowish-brown.

J. E. A. Lewis, 1910-116 ( BMNH) ; 7 ex., Malay Penin, Kuala Selangor , 3º20′ N / 101º15′ E, IX.1912, Expd. Agrc. Dept. ( BMNH) ; 4 ex., Malay Penin., Blackwater Est Klang , 3º02′ N / 101º26′ E , VI.1916, Expd. Agrc. Dept. ( BMNH) ; 1 ex., Malay Penin , Selangor-Kuala Lumpur, 3º30′ N / 101º31′ E, 1929, H. M. Pendle- bury ( BMNH) ; 1 ex., West Malaysia, Perak, Maxwell Hills , 4º47′ N / 100º45′ E, 3700-4500 ft., 13.II.1932, H. M. Pendlebury ( BMNH) ; 1 ex., Malay Penin, Negeri Sembilan, Port Dickson , 2º32′ N / 101º48′ E, 21.II.1933 ( BMNH) ; 2 ex., GAP Malaysia, 21. III.1974, Y. Kiyoyama ( CTJ) ; 1 ex., Sarawak, Gunong Mulu Nat. Park , 3º55′ N / 114º46′ E , R. G. S. Exped. 24. VI.1977/78, J. D. Holloway et al. ( BMNH) ; 1 ex., Kuala Lumpur, Jln Pantai Baru , 3º06′ N / 101º39′ E, 11.II.1982 , R. Sulaiman ( UKM) ; 1 ex., N. Sembilan, Hulu Bendul , 2º44′ N / 102º08′ E, 27.I.1989, Kamaruzaman ( UKM) ; 1 ex., Sabah, Pulau Manukan , 5º58′ N /116ºE, 1.X.1991, Zaidi & S. Abin ( UKM) ; 1 ex., West Malaysia, Perak, Maxwell Hills , 4º47′ N / 100º45′ E, 900–1000 m, 12.–16.I.1995, S. Be- evar ( CJB) .

Redescription

Total length. 3.50–4.90 mm (mean 4.36 mm, n = 10).

Head. Finely punctuated, entirely blackish. Labrum and mandibulae blackish. Antenna slender, extending almost to middle of the elytra, yellowish, the extreme apex of the last antennomere blackish ( Fig. 25A ). Second and third antennomere roughly of the same length; ratio length of second to third antennomere 0.87–1.00 (mean 0.97); ratio length of third to fourth antennomere 0.38–0.43 (mean 0.42; Fig. 25B ).

Abdomen. Pale yellow to brown.

Male genitalia. Median lobe parallel-sided at base, strongly narrowed in the apical quarter ( Figs 25 Ca, Cc). Median spiculae few short and slender spines, lateral spiculae broad, spiny structures, ventral spiculae very fine ( Fig. 25C ).

Female genitalia. Spermatheca with spherical nodulus having strong ridge, long and curved median part and short al slender cornu ( Fig. 25D ). Bursa sclerites, small and both pairs approximately of same size ( Fig. 25E ).

Diagnosis. Monolepta zonula looks most similar to M. signata , M. empatbulat sp. nov. and M. mohamedsaidi sp. nov. These four species have black elytron with circular yellowish spot at least on the basal half of elytron ( Figs 14A , 25A , 47A , 56A ) in common, with apical elytral quarter usually yellow. Head is usually black contrasting to the yellow pronotum in M. zonula , M. empatbulat sp. nov. and M. mohamedsaidi sp. nov. while pale brown to reddish-brown in M. signata . From M. empatbulat sp. nov. and M. mohamedsaidi sp. nov. it can be differentiated partly by size (total length M. zonula 3.50–4.90 mm; M. empatbulat sp. nov. 3.25–3.80 mm, M. mohammedsaidi sp. nov. 3.35–4.00 mm). In doubtful cases the median lobe with strong conical shape and the broad lateral spiculae ( Figs 14C , 25C , 47C , 56C ) allows a clear differentiation.

Distribution. This species is known from Peninsular Malaysia, Borneo and Sumatra ( Fig. 26 ).

Figures

Fig. 24. Type material of Monolepta zonula Weise, 1916. – Monolepta albofasciata Jacoby, 1889, syntype (MCZH).

Fig. 25. Monolepta zonula Weise, 1916. A. Colour pattern. B. Basal antennomeres. C. Median lobe, a. dorsal, b. lateral, c. ventral, without endophallic structures. D. Spermathecae. E. Bursa-sclerites, a. dorsal, b. ventral.

Fig. 26. Distribution of Monolepta zonula Weise, 1916, M. ranuensis sp. nov. and M. hitam sp. nov.

Fig. 23. Monolepta flavofasciata Jacoby, 1889. A. Colour pattern. B. Basal antennomeres. C. Median lobe, a. dorsal, b. lateral, c. ventral, without endophallic structures. D. Spermathecae. E. Bursa-sclerites, a. dorsal, b. ventral.

Fig. 14. Monolepta signata (Olivier, 1808). A. Colour pattern. B. Basal antennomeres. C. Median lobe, a. dorsal, b. lateral, c. ventral, without endophallic structures. D. Spermathecae. E. Bursa-sclerites, a. dorsal, b. ventral.

Fig. 47. Monolepta empatbulat sp. nov. A. Colour pattern. B. Basal antennomeres. C. Median lobe, a. dorsal, b. lateral, c. ventral, without endophallic structures. D. Spermathecae. E. Bursa-sclerites, a. dorsal, b. ventral.

Fig. 56. Monolepta mohamedsaidi sp. nov. A. Colour pattern. B. Basal antennomeres. C. Median lobe, a. dorsal, b. lateral, c. ventral, without endophallic structures. D. Spermathecae. E.Bursa-sclerites, a. dorsal, b. ventral.