ABSTRACT
A new genus of xyleborine ambrosia beetle, Melanesicus Beaver Petrov gen. n., with type species Xyleborus partitus Browne (1974) is described from the Melanesian region. The following new combinations are proposed: M. caledoniae (Beaver Liu, 2016) comb. n., M. deformatus (Browne, 1974) comb. n., M. granulosus (Schedl, 1975) comb. n., all from Xyleborus Eichhoff, 1864. Melanesicus tishechkini Petrov sp. n. is described from Vanuatu, and Melanesicus nukuruanus sp. n. Beaver from Fiji. The taxonomy, distribution and biology of the species included are briefly reviewed.
Subject(s)
Coleoptera , Weevils , Ambrosia , Animals , MelanesiaABSTRACT
The four species currently placed in the genus Immanus Hulcr and Cognato are reviewed. Immanus papuanus Beaver, Sittichaya Liu sp. n. is described. The following new synonymy is proposed: Immanus desectus (Eggers, 1923) (= Xyleborus insignis Browne, 1984 syn. n.). The following new combinations are proposed: Immanus pseudocolossus (Schedl, 1942) comb. n., I. sarawakensis (Eggers, 1923) comb. n., I. trolaki (Schedl, 1939) comb. n., all originally described in Xyleborus. A key to the females of the eight species now included in the genus is provided. The taxonomy, diagnostic characters, distribution and biology of the species are briefly discussed.
Subject(s)
Coleoptera , Weevils , Animals , Biology , FemaleABSTRACT
The genus Diapus Chapuis was erected (Chapuis 1865) for four species of pinhole borer (Curculionidae: Platypodinae) from the Oriental region and New Guinea. It was distinguished from other platypodine genera primarily by the widely separated procoxae (Chapuis 1865). Hopkins (1914) designated Diapus quadrispinatus Chapuis, 1865 as the type species of the genus. The genus is currently placed in the platypodine tribe Tesserocerini, subtribe Diapodina (Alonso-Zarazaga & Lyal 2009). Only two genera are included in the Diapodina, Diapus and Genyocerus Motschulsky (Alonso-Zarazaga & Lyal 2009, Jordal 2015). Diapus is distinguished from Genyocerus by the following characters (Wood 1993, Beaver & Liu 2007): 1. In Diapus, the scutellum is narrower and more sunken, not flush with the elytral surface posteriorly as it is in Genyocerus. 2. The mycangial pores of Diapus are sometimes fused to form a transverse or crescentic bar on each side of the midline of the pronotum. This does not occur in Genyocerus. 3. The antennal club of Diapus sometimes has a median testaceous strip lacking sensillae on the anterior face. This strip is never present in Genyocerus. 4. The males of Diapus never possess a membranous extension of the apical margin of the fourth abdominal ventrite, present in some species of Genyocerus. 5. The females of Diapus often bear deciduous mandibular appendages, which are never present in Genyocerus (Beaver & Liu 2007).
Subject(s)
Weevils/classification , Animal Distribution , Animal Structures/anatomy & histology , Animal Structures/growth & development , Animals , Body Size , China , Female , Male , Organ Size , Thailand , Weevils/anatomy & histology , Weevils/growth & developmentABSTRACT
The present state of knowledge of the scolytine ambrosia beetles of Thailand is summarised to provide a basis for future studies of the fauna and its economic importance in forestry, timber production and crop tree plantations. A checklist of the fauna is provided with information on local and world distribution, host trees, biology and taxonomy. Six faunal elements based on geographical distribution, and the host tree and altitudinal preferences of species are discussed. One hundred and sixty-one species are recorded from Thailand, 67 of them for the first time. The following new synonym is proposed: Euwallacea wallacei (Blandford) (= Xyleborus barbatomorphus Schedl n.syn.). The following new combinations are given: Ambrosiophilus cristatulus (Schedl), Ambrosiophilus latisulcatus (Eggers), Beaverium dihingensis (Eggers), Beaverium lantanae (Eggers) and Immanus desectus (Eggers) are transferred from their present position in Ambrosiodmus; Ancipitis depressus (Eggers) and Ancipitis punctatissimus (Eichhoff) are transferred from Leptoxyleborus; Cyclorhipidion armipenne (Schedl), Cyclorhipidion inarmatum (Eggers), Euwallacea semiermis (Schedl), Fortiborus macropterus (Schedl), Microperus nudibrevis (Schedl) and Wallacellus minutus (Blandford) are transferred from Xyleborus.
Subject(s)
Animal Distribution , Weevils/classification , Weevils/physiology , Animals , Female , Male , Species Specificity , Thailand , Weevils/anatomy & histologyABSTRACT
The present state of knowledge of the pin-hole borers of Thailand is summarised to provide a basis for future studies of the fauna and its economic importance in forestry and timber production. A checklist of the fauna is provided with information on local and world distribution, host trees, biology and taxonomy. Six faunal elements based on geographical distribution, and the host preferences of species are discussed. Ninety-two species have now been recorded in Thailand, of which forty-three are recorded here for the first time. Three species are endemic to Thailand. The following new combinations are given: Dinoplatypus piniperda (Schedl), Treptoplatypusfulgens (Schedl), both transferred from Platypus.
