Research Article |
Corresponding author: Jing Li ( lijing1976416514@163.com ) Academic editor: Michael Thomas
© 2017 Jing Li, Yan-Chen Zhao, Guo-Dong Ren, Zhiqiang Cheng.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Li J, Zhao Y-C, Ren G-D, Cheng Z (2017) Taxonomic study on specimens of the genus Micrencaustes deposited in the Bernice P. Bishop Museum (Coleoptera, Erotylidae). ZooKeys 645: 27-35. https://doi.org/10.3897/zookeys.645.11003
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Specimens of the genus Micrencaustes deposited in Bernice P. Bishop Museum were studied. Two new species Micrencaustes (Mimencaustes) rotundimaculatasp. n. and Micrencaustes (Mimencaustes) serratimaculatasp. n. are described and illustrated. A key to worldwide species of the subgenus Mimencaustes is provided.
Philippines, Australia, key, new species, taxonomy
The genus Micrencaustes was established by
In the past, M.
Morphological examinations were carried out with a Nikon SMZ1500 stereomicroscope. To examine the genitalia, the abdominal segments were detached from the body after softening in hot water. All measurements are given in millimeters. Holotypes and a paratype are deposited in
1 | Body entire dark, without marks | 2 |
– | Body with marks | 3 |
2 | Body strongly shining | M. (M.) papuana Heller |
– | Body weakly shining | M. (M.) dehaanii (Castelnau) |
3 | The marks on pronotum and elytron | 4 |
– | The marks only on pronotum or elytron | 6 |
4 | Pronotum without black spots in the mark | M. (M.) serratimaculata sp. n. |
– | Pronotum with one or two black spots in the mark | 5 |
5 | Head with an irregular red mark between eyes, antennomere III almost equal to antennomere IV | M. (M.) torquata Gorham |
– | Head without mark between eyes, antennomere III approx 1.5 times as long as antennomere IV | M. (M.) taiwana Araki |
6 | Pronotum with marks | 7 |
– | Elytron with marks | 8 |
7 | Head without orange mark, prosternal femoral lines surpassing the front edge of coxae | M. (M.) acridentata Li & Ren |
– | Head with orange mark, prosternal femoral lines reaching the front edge of coxae | M. (M.) renshiae Meng, Ren & Li |
8 | Basal mark of elytron with two black spots near anterior border | 9 |
– | Basal mark of elytron without black spots near anterior border | 10 |
9 | Pronotum with impunctate longitudinal median areas; every tibia with outer edge of apex acutely toothed | M. (M.) michioi Osawa |
– | Pronotum without impunctate longitudinal median areas; mesotibia with outer edge of apex acutely toothed | M. (M.) biomaculata Meng, Ren & Li |
10 | Basal mark of elytron emarginated on posterior border | M. (M.) wunderlichi Heller |
– | Basal mark of elytron not emarginated on posterior border | 11 |
11 | Elytron with posterior mark longitudinally oval | M. (M.) dajaca Heller |
– | Elytron with posterior mark rounded | M. (M.) rotundimaculata sp. n. |
Holotype. male, PHILIPPINES: Camarines Sur, Mt. Iriga, 13.4158°N, 123.4211°E, alt. 500-600m, 22 April 1962, H.M. Torrevillas leg. Paratype. 1 female, PHILIPPINES: Queznn, Queznn Park Tayahas[Note: The spelling on the label is wrong. Quezon, Quezon Park Tayabas is correct.], 14.6509°N, 121.0443°E, alt. 305m. 5 June 1932, F.C. Hadden leg.
Body elongated, widest at base of elytra, general color dark. Each elytron with two orange marks; anterior mark almost reaching lateral and basal margins, quadrate; the posterior one placed before the apex, rounded. Clypeus with the anterior border shaped like a concave “V”. Antennomere III approx. 1.4 times as long as IV; relative lengths of antennomeres II–XI: 11: 25: 18: 18: 18: 17: 16: 19: 12: 16. The terminal segment of maxillary palpus triangular, with sides rounded, nearly 2.9 times as wide as long. The elytron with strong striae, intervals finely and sparsely punctured. Mesoventrite with a median transverse rectangular depression.
Body (Fig.
Head (Fig.
Pronotum (Fig.
Prosternum (Fig.
Prosternal process triangular, produced into a blunt point at apex, emarginate at posterior border, finely punctured at front, with a rounded depression in the middle of base, covered longitudinal wrinkles. Prosternal femoral lines almost straight, converging anteriorly and slightly exceeding the front edge of coxae.
Scutellum pentagonal, with fine and sparse punctures.
Elytra widest near base, then gradually narrowing to apex. Each elytron with nine striae, the outside stria short; strial punctures stronger at base, gradually weakened apically and disappearing before extremity; intervals finely punctured and wrinkled.
Mesoventrite (Fig.
Metaventrite finely and sparsely punctured, with a longitudinal depression in the middle of basal seven eighths.
Abdomen densely punctured, covered with short golden hairs.
Male genitalia (Fig.
Female genitalia (Fig.
Philippines (Camarines Sur and Quezon).
Micrencaustes (Mimencaustes) rotundimaculata is most similar to Micrencaustes (Mimencaustes) dajaca Heller, 1918, due to the similar form and pattern of the elytron. The new species can be distinguished from it by: the elytron with an anterior quadrate mark, and a rounded posterior mark; clypeus with the anterior border shaped like a concave “V”; mesoventrite with a median transverse rectangular depression; and the elytron with strong striae, intervals finely and sparsely punctured. In contrast, Micrencaustes (Mimencaustes) dajaca has two elongate rounded marks on each elytron; clypeus with anterior border feebly emarginated; mesoventrite with a transverse arched depression in the middle; elytron with weak striae, intervals finely and densely punctured.
The species is named for having the posterior band of the elytron rounded.
Holotype. Female, Australia: Queensland, Hambledon [Note: Now named Edmonton], 17.0165°S, 145.7487°E, November 1921, Pemberton leg.
Body oblong oval, convex, general color dark, shiny. Pronotum with one transverse, zigzag dark red mark. Each elytron with two dark red bands. Clypeus anterior border feebly emarginated. Antennae short, antennomere III 1.7 times as long as IV; relative lengths of antennomeres II–XI: 22: 58: 34: 36: 34: 34: 30: 42: 27: 30. The terminal segment of maxillary palpus triangular, with rounded sides, nearly 2.9 times as wide as long. Pronotum widest at middle, with a group of coarse punctures on each side of base. Scutellum almost triangle, not transverse. Mesoventrite broad, with coxal lines. Abdomen finely and closely punctured. The last segment of abdomen covered with very large punctures along the outside edge. Mesotibia with outer edge of apex acutely toothed.
Body (Fig.
Head (Fig.
Pronotum (Fig.
Prosternum (Fig.
Prosternal process triangular, produced into a blunt point at apex, emarginated on posterior border, sparsely punctured on point, with longitudinal rugulae at front. Prosternal femoral lines converging anteriorly and slightly exceeding to the front edge of coxae.
Scutellum almost triangle, posterior angle blunt, and surface with fine and sparse punctures.
Elytra widest near base, then gradually narrowing to apex. Each elytron with seven striae; intervals finely punctured and wrinkled.
Mesoventrite (Fig.
Metaventrite finely and sparsely punctured, with a longitudinal depression on posterior seven eighth.
Abdomen finely and closely punctured, covered with short golden hairs, with smooth areas laterally on the surface of abdominal segments. The last segment of abdomen covered very large punctures along the outside edge.
Mesotibia with outer edge of apex acutely toothed.
Female genitalia (Fig.
Known only from the type locality (Australia: Queensland, Edmonton).
Micrencaustes (Mimencaustes) serratimaculata is most similar to Micrencaustes (Micrencaustes) gigas MacLeay 1887, due to the similar form and color pattern of body. The new species can be distinguished from it by the mesosternum with coxal lines; very shiny body surface; scutellum not transverse; and the abdomen finely and closely punctured. Micrencaustes (Micrencaustes) gigas is without mesocoxal lines, only moderately shiny, scutellum is transverse, and the ventral surface is sparsely punctured.
The species is named for the zigzag mark on pronotum.
We are grateful to Mr. James Boone (Collection Manager, Department of Entomology, Bernice P. Bishop Museum) for lending us valuable specimens. We thank Dr. William P. Haines (Hawaii Department of Land and Natural Resources, and University of Hawaii at Manoa) for his assistance in preparation of the manuscript. The work was supported by the National Natural Science Foundation of China (No. 31101664), the National Natural Science Foundation of Hebei (No. C2015204078) and Outstanding Talents of Agricultural University of Hebei.