Monolepta mentaweiensis ( Jacoby, 1896 )

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 : 157-158

Monolepta mentaweiensis ( Jacoby, 1896)

Figs 27–30

Candezea mentaweiensis Jacoby, 1896: 143 .

= Monolepta basalis Jacoby, 1884: 55 ( Weise 1924: 78) .

= Monolepta hageni Weise, 1916: 40 ; syn. nov.

Candezea mentaweiensis is the next available name given priority over Monolepta basalis Jacoby, 1884 because of its junior homonymy over M. basalis Harold, 1880: 26 . The senior homonym, described from East Africa, is meanwhile transferred to Bicolorizea ( Heunemann et al. 2015), but the junior homonym cannot be revalidated after article 57.2. (IZCN-Code).

Further material examined. – Brunei. 1 ex., Labi, Bukit Teraja , 4º18′ N / 114º26′ E, 60 m, 23. VIII.79, S. L. Sutton ( BMNH) . – Indonesia. 1 ex., Sumatra Exped. , Jacoby Coll. 1909-28a ( BMNH) ; 1 ex., Sumatra, Manna , 4º27′ S / 102º59′ E, M. Knappertt., Coll. Vett ( RMNH) ; 1 ex., N. O. Sumatra, Tandjong Morawa, Serdang , 0º35′ S / 101º18′ E, Dr. B. Hagen ( BMNH) ; 7 ex., Suma- tra, Moera Laboe , XI.1877 ( RMNH) ; 4 ex., Borneo, Mt. Tibang , Mjoberg ( NHRS) ; 1 ex., East Borneo, Sanga Sanga , 0°38′ S / 117°12′ E, 1907-203, H. D. Jansen ( BMNH) ; 1 ex., Sumatra, Moera Laboe , X.1877 ( RMNH) ; 1 ex., Sarawak, Kapit distr., Sebong , 1°33′ N / 114°17′ E, III.1994, J. Horák ( CJB) . – Malaysia. 2 ex., Borneo ( BMNH) ; 7 ex., Perak, 4º48′ N / 101º09′ E, Doherty, Fry Coll. 1905.100, Jacoby Coll. ( BMNH) ; 1 ex., Borneo , Baly Coll. ( BMNH) ; 1 ex., Penang, 5º15′ N / 100º29′ E, (Lamb.), Pascoe Coll. ( BMNH) ; 1 ex., Sarawak, Bidi , 4.II.1909, C. J. Brooks ( BMNH) ; 7 ex., West Sarawak, Mt. Matang , 1º34′ N / 110º16′ E, 16.–30.XII.1913, I.1914, G. E. Bryant ( BMNH) ; 3 ex., W. Sarawak, Lundu , 1º40′ N / 109º48′ E, I.1914, G. E. Bryant ( BMNH) ; 1 ex., Malay Penin, Selangor-Pahang , 2700 ft., 3º30′ N / 101º31′ E, I.1915, ex. F. M. S. ( BMNH) ; 3 ex., Malay Penin. Kedah nr Jitra , catchment area, 6º15′ N / 100º25′ E, 4.–7.IV.1928, H. M. Pendlebury ( BMNH) ; 1 ex., Malay Penin, Pahang, F. M. S., Fraser Hills , 4200 ft., 3º42′ N / 101º41′ E, 11.IX.1931, H. M. Pendlebury ( BMNH) ; 1 ex., Sarawak, Matang , 1º34′ N / 110º17′ E, 10. V.1909, C. J. Brooks ( BMNH) ; 1 ex., Kuala Lumpur, Gardens , 3º08′ N / 101º41′ E, 18. XII.1938, H. M. Pendlebury ( BMNH) ; 1 ex., Langkawi Island , 6º21′ N / 99º49′ E, 30.IV.1928 ( BMNH) ;

Type material. Monolepta basalis . Lectotype: ♀, “Ma Loe II.77 / Monolepta basalis Jac. ” ( RMNH; ( Fig. 27 ) . Paralectotypes: 4 ex., same data as lectotype ( RMNH) , 1 ex., “ Ma Loe , 10.77” ( RMNH) , 1 ex., Spjg II.77 ( RMNH) , 1 ex., “Ma Loe II.77 / Sumatra Exped. / 1st Jacoby Coll. / Type 18461” ( MCZH) . A lectotype is herein designated to fix the name on a single specimen since Jacoby gave no details on specimen numbers in his original publication.

Candezea mentaweiensis . Syntypes: “Mentawei Sipora Sereinu V-VI, 94 Modigliani / Museo Civ. Genova / Candezea mentaweiensis Jac. / Jacoby Coll. 1909-28a / Co-type” ( BMNH; Fig. 28 ). A further syntype with the same data is in MCGD. Type locality: 2º10′ S / 99º41′ E.

1 ex., Selangor, Bukit Kutu , 3500 ft., 3º33′ N / 101º43′ E, 18. III.1931, H. M. Pendlebury ( BMNH) ; 2 ex., Perak , F. M. S. Larut Hills, 3700 ft., 5º01′ E / 100º53′ E, 14.II.1932, H. M. Pendlebury ( BMNH) ; 1 ex., Pahang, Taman Negara , 3º58′ N / 102º26′ E, 1.–13. III.1984, L. Jessop ( BMNH) ; 1 ex., Sabah, Poring , 6º02′ N / 116º42′ E, 6.XI.1986, F. Abang ( UKM) ; 1 ex., Sabah, nr Danum Valley Field, 5º25′ N / 118º23′ E, 20. VI.–12. VII.1987, C. v. Achther- berg & D. Kennedy ( RMNH) ; 1 ex., Kedah, Langkawi, Lubuk Sembilang , 6º21′ N / 99º48′ E, 7.IV.1993, Ismail, Sham, Yusof ( UKM) ; 1 ex., Perak, Temenggor, Ekspedisi MNS-Belum, 5º33′ N / 101º20′ E, 29.XI.1993, Ismail, Yusof, Bidi & Saiful ( UKM) ; 1 ex., Perlis, Wang Kelian , 6º40′ N / 100º11′ E, 19. VII.1994, Salleh, Ismail & Ruslan ( UKM) ; 3 ex., Terengganu, Setiu , H. Lipur Peladang, 5º27′ N / 102º45′ E, V.1994, Ismail & Zabidi ( UKM) ; 1 ex., Kedah, Pulau Langkawi, Gunung Raya , 933 m, 6º21′ N / 99º48′ E, 21. V.1995, Ismail, Ruslan & Sham ( UKM) ; 6 ex., Sabah, Danum Valley , 5º25′ N / 118º23′ E, 6.–15.V.2007, 11.IX.2007, 11.IX.2007, B. H. Izfa ( UKM) ; 5 ex., Sabah, Lembah Danum , 5º25′ N / 118º23′ E, 16.– 19.V.1991, 27.–31.VIII.1991, 3.–5.XII.1991, 22.–25. VIII.1992, 6.V.2007, Ismail et al. ( UKM) ; – Singapore. 2 ex., Singapore , 1º21′ N / 103º49′ E, 97-109, H. N. Rid- ley ( BMNH) ; 1 ex., Singapore, H. N. Ridley ( BMNH) . – Thailand. 1 ex., Siam, Renong , 13º45′ N / 100º29′ E, Doherty, Fry Coll. ( BMNH) ; 2 ex., Nakon Sri Tamarat, Khao Ram , 1500-2900 ft., 17º01′ N / 99º49′ E, 28.II.1922, H. M. Pendlebury ( BMNH) ; 1 ex., Phang-nga Prov. , 5 km S Kao Lak, 8°36′ N / 98°15′ E, VIII.2014, A. Skale ( NME) . – Vietnam. 3 ex., Na Hang , 160 km, NNW Hanoi, 22°16′ N / 105°17′ E, 200 m, VI.1996, A. Napolov ( NME) .

Redescription

Total length. 4.90–6.25 mm (mean 5.91 mm, n = 10).

Head. Very finely punctuated, brown-reddish and frons partly black. Labrum and mandible black. Antenna slen- der, extending almost to half of the elytra, rarely either entirely yellowish, and than often with brownish parts in middle of antennomeres ( Fig. 28b ), or brownish or black with two apical yellowish antennomeres ( Fig. 29A ). Third antennomere slightly longer than second; ratio length of second to third antennomere 0.75–1.00 (mean 0.80); ratio length of third to fourth antennomere 0.38– 0.50 (mean 0.42; Fig. 29B ).

Thorax. Pronotum finely punctuated, entirely red- disch-brown and posterior sides rounded and basally widened. Pronotal width 1.60–2.00 mm (mean 1.84 mm), ratio length to width 0.53–0.57 (mean 0.55). Scutellum, meso- and metathorax reddish-brown. Elytron distinctly widened behind, yellow to reddish-brown and in most specimens darker brownish-red in the basal third ( Figs 27b , 29A ). Elytral length 3.90–5.00 mm (mean 4.68 mm), maximal width of both elytra together 2.80– 3.70 mm (mean 3.49 mm), ratio of maximal width of both elytra together to length of elytron 0.70–0.78 (mean 0.74). Legs brown-reddish.

Abdomen. Yellow, contrasting paler to the more brownish metathorax.

Male genitalia. Median lobe broad at base and more slender in the apical half ( Fig. 29C ). Median spiculae comparatively short and slender, three lateral spiculae as short broad spines or brush-like structures, ventral spiculae very small and weakly sclerotised ( Figs 29 Ca, Cb).

Female genitalia. Spermatheca with large spherical nodulus, middle part and cornu short and broad ( Fig. 29D ). Bursa sclerites weakly sclerotised ( Fig. 29E ).

Diagnosis. In colouration, Monolepta mentaweiensis is most similar to M. bruneiensis sp. nov., both species have a slight contrast between the brown-reddish pronotum the paler elytra. In most cases, M. mentaweiensis possesses a brown-reddish elytral base that does not occur in M. bruneiensis sp. Monolepta mentaweiensis (4.90– 6.25 mm) is much larger than M. bruneiensis sp. nov. (3.75–4.70 mm). The frons and mouthpart are partly black in M. mentaweiensis while in M. bruneiensis , it is brown-reddish as the head. The genitalic characters are quite different between these two species ( Figs 29C–E , 44 C–E ).

Distribution. Northern Vietnam to Thailand through Malay Pensinsula towards Sumatra and Borneo ( Fig. 30 ).

Figures

Figs 27–28. Type material of Monolepta mentaweiensis (Jacoby, 1896). – 27. Candezea mentaweiensis Jacoby, 1896, syntype (BMNH). 28. Monolepta basalis Jacoby, 1884, lectotype, ♀ (RMNH).

Fig. 29. Monolepta mentaweiensis (Jacoby, 1896). 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. 30. Distribution of Monolepta mentaweiensis (Jacoby, 1896) and M. putri Mohamedsaid, 2001.

Fig. 44. Monolepta bruneiensis 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.