Japanese Journal of Systematic Entomology, 22 (2): 303–305. November 30, 2016. Morphological and Biological Notes of the Larva of Idgia notaticollis Pic (Coleoptera: Prionoceridae) Makoto ASANO 1), Hiroyuki YOSHITOMI 2) and Hong Thai PHAM 3) 1) Teiso Kasei Co. Ltd., Nishijima 164–1, Suruga-ku, Shizuoka-shi, Shizuoka, 422–8045 Japan 2) Laboratory of Entomology, Ehime University, Tarumi 3–5–7, Matsuyama-shi, Ehime, 790–8566 Japan 3) Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet St, Cau Giay, Hanoi, Vietnam Abstract Morphological and biological characteristics of final instar larva of Idgia notaticollis Pic belonging a little-known beetle family Prionoceridae Lacordaire is described based on a larval cuticle for the first time. characteristics of the final instar larva of Idgia notaticollis Introduction based on a larval cuticle and biological information. The family Prionoceridae Lacordaire, 1857 of the melyrid lineage belonging the superfamily Cleroidea Latreille, 1802 Materials and method is represented by more than 150 species (Geiser, 2007). A pupa with final instar larval cuticle of Idgia notaticollis Adults are often collected on flowers and at least some are (Fig. 2) was collected at Cuc Phuong NP., Ninh Bình Prov. known to be pollen feeders. Larvae have been found in soil (369 m), on 8 March 2015. The determination of the species and leaf litter, as well as under bark. It has been considered name was based on an emerged adult (Fig. 1) in captivity. that adults are pollenophagous and larvae are predaceous or The specimen of the adult and its larval cuticle is preserved in saprophagous (Lawrence et al., 2008; Yang et al., 2012 etc.). Ehime University Museum. The larval morphology and biology are little known The observations were made under compound micro- compared with other families of the melyrid lineage. So far, scopes (Olympus BX41 and CHS) attached drawing tubes. larval morphology of Lobonyx aeneus (Fabricius, 1787), Idgia The terminology follows Lawrence et al. (1999). The sp., and Eocene species Prionocerites tattriei Lawrence et abbreviations used herein are as follows: FL – maximum al, 2008 were described (Crowson, 1964; Fiori, 1971; Majer, length of frons; EL – maximum length of epicranial plate; HW 1994; Lawrence et al., 2008). – maximum width of head capsule; PFL – maximum length of Recently, a pupa with final instar larval cuticle of Idgia profemur; PTL – maximum length of protibia; UL – maximum notaticollis Pic, 1943 was collected from the bamboo by length of urogomphi. second author (Fig. 12). In the present paper, we describe Final instar larva of Idgia notaticollis Pic (Figs. 3–11) Structure. Head capsule trapezoid, with dense short setae; frons large, with two pairs long setae; epicranial plate with pair of long seta (Fig. 3). Labrum about 2.1 times as broad as long, with 18 to 20 pairs of setae and one or two pores (Fig. 3). Number of stemmata five; anterior three arranged in transverse row and posterior two (Fig. 3). Antennae 3-segmented; 1st antennomere with long seta; 2nd with conical sensorium and two long setae; apical with four pores, a long and three short setae (Fig. 5). Mandibles each with distinct teeth on cutting edge, ventral margin ridged and provided with one tooth, external face with six long and some short setae. Prostheca stout and short (Fig. 6). Maxillary palpi 3-segmented; 1st palpomere with two pores near base; 2nd with short seta and pore; apical longer than preceding, with short three setae and sensilla (Fig. 4). Labial palpi 2-segmented, with apical seta and sensilla (Fig. 4). Prementum elongated, with 15 setae. Maxillary stipes and postmentum with dense short setae, the former with four pairs long setae, the later five long setae (Fig. 4). Cardo subtriangular, with eight pairs of setae (Fig. 4). Thoracic tergites strongly sclerotized, covered with dense short and long setae. Metathorax with pair of membranous Figs. 1–2. Photographs of Idgia notaticollis Pic. ––––1, Adult; 2, final instar larval cuticle. appendage laterally. Spiracles annular (Fig. 7). Ⓒ Japanese Society of Systematic Entomology 304 Asano, M., H. Yoshitomi and H. T. Pham Figs. 3–11. Final instar larva of Idgia notaticollis Pic. ––––3, Head in dorsal view; 4, mouth parts in ventral view; 5, antenna in dorsal view; 6, mandible in dorsal view; 7, spiracle; 8, 8th tergite; 9, urogomphi in dorsal view; 10, membranous appendage of urogomphi; 11, midleg in dorsal view. Scales: A for 3, 8, 9, 11; B for 4, 6; C for 5. November 30, 2016, JJSE 22 (2) Larva of Idgia notaticollis Pic (Coleoptera: Prionoceridae) 305 Fig. 12. Pupa of Idgia notaticollis Pic on bamboo internode (left) and its collecting site (right). Photo by HY. Abdominal tergites strongly sclerotized, covered with in providing advices and publications. This study is supported dense short strong setae, pleated weakly on the surface, nine in part by KAKENHI (24405028; principal investigator: S. segmented. Eighth abdominal tergite with 37 or 38 pairs Okajima). of strong setae (Fig. 8). Urogomphi elongated, subparallel, straight, slightly dentate exteriorly, dorsal surface with nine or References ten pairs of long setae and two pair of membranous appendage Crowson, R. A., 1964. A review of the classification of Cleroidea in middle (Figs. 9, 10). (Coleoptera), with descriptions of two new genera of Peltidae Legs elongated, with dense short strong setae. Femora and of several new larval types. The Transactions of the Royal elongated, with four long setae interiorly. Claw slender, with a Entomological Society of London, 116(12): 275–327. short seta (Fig. 11). Geiser, M. F., 2007. Studies on the Prionoceridae (Coleoptera, Measurements in mm (n = 1). FL: 0.5; EL: 0.3; HW: 1.4; Cleroidea) I. A new species of Prionocerus Perty, 1831 from PFL: 1.2; PTL: 1.0; UL: 1.2. Sumatra. Entomologica Basiliensia et Collectionis Frey, 29: Biological notes. The pupa (Fig. 12) was collected from 167–170. Fiori, G., 1971. Contributi alla conoscenza morfologica ed a internode of bamboo Neohouzeaua dullooa (Gamble) A. etologica dei coleotteri. iX. Psilothrix viridicaeruleus (Geoffr.) Camus. (Melyridae Dasytinae). Studi Sassaresi, 19: 3–70. Remarks. The presence of appendage on abdomen could Lawrence, J. F., A. M. Hastings, M. J. Dallwitz, T. A. Paine and E. J. not been recognized from this larval cuticle. Zurcher, 1999. Beetle larvae of the world. CD–ROM, Version The final instar larva of Idgia notaticollis has following 1.1 for Microsoft–Windows. CSIRO Publishing, Melbourne. distinguished characteristics: strong setae covering body, Lawrence, J. F., S. B., Archibald and A., Ślipiński, 2008. A new large frons, stout and short prostheca of mandibles, strong species of Prionoceridae (Coleoptera: Cleroidea) from the sclerotized tergites, pair of membranous appendage on Eocene of British Columbia, Canada. Annals zoologici, Warszawa, 58(4): 689–693. metathorax and urogomphi, long femur, and long and straight Majer, K., 1994. A review of the classification of the Melyridae urogomphi, compared with those of other families of the and related families (Coleoptera, Cleroidea). Entomologica melyrid lineage. Basiliensia, 17: 319–390. Yang, Y., M., Geiser and X., Yang, 2012. A little-known beetle Acknowledgment family in China, Prionoceridae Lacordaire, 1857 (Coleoptera: Cleroidea). Entomotaxonomia, 34(2): 378–390. We wish to thank Dr. Wataru Toki and Mr. Tomoki Hirano (Kyoto University) and Mr. Ryosuke Okano for their help in [Received: November 1, 2016; accepted: November 18, 2016] the field investigation, Dr. Michael F. Geiser for his kindness November 30, 2016, JJSE 22 (2).