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)
2)
Teiso Kasei Co. Ltd., Nishijima 164–1, Suruga-ku, Shizuoka-shi, Shizuoka, 422–8045 Japan
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.
Introduction
The family Prionoceridae Lacordaire, 1857 of the melyrid
lineage belonging the superfamily Cleroidea Latreille, 1802
is represented by more than 150 species (Geiser, 2007).
Adults are often collected on flowers and at least some are
known to be pollen feeders. Larvae have been found in soil
and leaf litter, as well as under bark. It has been considered
that adults are pollenophagous and larvae are predaceous or
saprophagous (Lawrence et al., 2008; Yang et al., 2012 etc.).
The larval morphology and biology are little known
compared with other families of the melyrid lineage. So far,
larval morphology of Lobonyx aeneus (Fabricius, 1787), Idgia
sp., and Eocene species Prionocerites tattriei Lawrence et
al, 2008 were described (Crowson, 1964; Fiori, 1971; Majer,
1994; Lawrence et al., 2008).
Recently, a pupa with final instar larval cuticle of Idgia
notaticollis Pic, 1943 was collected from the bamboo by
second author (Fig. 12). In the present paper, we describe
characteristics of the final instar larva of Idgia notaticollis
based on a larval cuticle and biological information.
Materials and method
A pupa with final instar larval cuticle of Idgia notaticollis
(Fig. 2) was collected at Cuc Phuong NP., Ninh Bình Prov.
(369 m), on 8 March 2015. The determination of the species
name was based on an emerged adult (Fig. 1) in captivity.
The specimen of the adult and its larval cuticle is preserved in
Ehime University Museum.
The observations were made under compound microscopes (Olympus BX41 and CHS) attached drawing tubes.
The terminology follows Lawrence et al. (1999). The
abbreviations used herein are as follows: FL – maximum
length of frons; EL – maximum length of epicranial plate; HW
– maximum width of head capsule; PFL – maximum length of
profemur; PTL – maximum length of protibia; UL – maximum
length of urogomphi.
Final instar larva of Idgia notaticollis Pic
(Figs. 3–11)
Figs. 1–2. Photographs of Idgia notaticollis Pic. ––––1, Adult; 2,
final instar larval cuticle.
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
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)
305
Larva of Idgia notaticollis Pic (Coleoptera: Prionoceridae)
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
dense short strong setae, pleated weakly on the surface, nine
segmented. Eighth abdominal tergite with 37 or 38 pairs
of strong setae (Fig. 8). Urogomphi elongated, subparallel,
straight, slightly dentate exteriorly, dorsal surface with nine or
ten pairs of long setae and two pair of membranous appendage
in middle (Figs. 9, 10).
Legs elongated, with dense short strong setae. Femora
elongated, with four long setae interiorly. Claw slender, with a
short seta (Fig. 11).
Measurements in mm (n = 1). FL: 0.5; EL: 0.3; HW: 1.4;
PFL: 1.2; PTL: 1.0; UL: 1.2.
Biological notes. The pupa (Fig. 12) was collected from
a internode of bamboo Neohouzeaua dullooa (Gamble) A.
Camus.
Remarks. The presence of appendage on abdomen could
not been recognized from this larval cuticle.
The final instar larva of Idgia notaticollis has following
distinguished characteristics: strong setae covering body,
large frons, stout and short prostheca of mandibles, strong
sclerotized tergites, pair of membranous appendage on
metathorax and urogomphi, long femur, and long and straight
urogomphi, compared with those of other families of the
melyrid lineage.
Acknowledgment
We wish to thank Dr. Wataru Toki and Mr. Tomoki Hirano
(Kyoto University) and Mr. Ryosuke Okano for their help in
the field investigation, Dr. Michael F. Geiser for his kindness
in providing advices and publications. This study is supported
in part by KAKENHI (24405028; principal investigator: S.
Okajima).
References
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[Received: November 1, 2016; accepted: November 18, 2016]
November 30, 2016, JJSE 22 (2)