Skip to main content

Jung-Chan Chen olive leaf beetle (Argopistes jungchani), Mei-Hua Tsou (A. tsoui) and Su-Fang Yu (A. yuae)

Jung-Chan Chen olive leaf beetle (Argopistes jungchani), Mei-Hua Tsou (A. tsoui) and Su-Fang Yu (A. yuae)

NEWS - Three species from Taiwan were described, Jung-Chan Chen olive leaf beetle (Argopistes jungchani sp. nov.), Mei-Hua Tsou olive leaf beetle (Argopistes tsoui sp. nov.) and Su-Fang Yu olive leaf beetle (Argopistes yuae sp. nov.) along with 4 species were redescribed: A. biplagiatus Motschulsky 1860, A. rufus Chen 1934, A. tsekooni Chen 1934 and A. unicolor Jacoby 1885.

This study proposes that A. rufus Chen 1934 stat. nov. be elevated to species status from variety of A. biplagiatus Motschulsky 1860. A. coccinelliformis Csiki 1940 syn. nov. and A. ryukyuensis Shigetoh & Suenaga 2022 syn. nov. as a junior synonym of A. rufus Chen 1934 Lectotypes assigned to A. undecimmaculata Jacoby 1885, A. unicolor Jacoby 1885 and A. biplagiatus var. Rufus Chen 1934.

A. jungchani is named after Jung-Chan Chen (陳榮章), the first person to collect specimens. Distribution is known only from the type locality. Adults are easily recognized by color pattern. Body black with yellowish brown lateral edges of pronotum and elytra.

Genital characters are diagnostic: apex of aedeagus tubular, but parallel-sided from near apex to middle (vs. narrowing apically from near apex to middle in A. tsekooni). Paired elongate tectum small, 0.76 of anterior aperture (vs. paired elongate tectum long, 0.85 of anterior aperture in A. tsekooni).

Anterior aperture from apex 1/13–2/5 (vs. anterior aperture from apex to apex 2/5 in A. tsekooni). Only two pairs of long setae on apical margin of VIII ventrite of abdomen in females (vs. more than two pairs of setae on apical margin of VIII ventrite in females of other species) and cylindrical gonocoxae.

A. tsoui hosts Osmanthus heterophyllus, O. kaoi, O. enervius and O. fragrans. The species appears to be univoltine. Larvae were only found in late March. Epithet after Mei-Hua Tsou (曹美華), the first person to collect specimens. Widespread distribution in lowland Taiwan.

Adults have reddish brown elytra with broad black lateral margins, but differ in reddish brown pronotum with broad black lateral margins (vs. entire pronotum black in A. biplagiatus). Diagnostic genital characters include pointed apex of aedeagus (vs. relatively narrower in lateral view in A. biplagiatus).

Longer, longitudinal paired sclerites of tectum (vs. short, curved paired sclerites of tectum in A. biplagiatus), anterior opening from apical 1/10 to midline (vs. anterior opening from apex to apical 3/10 in A. biplagiatus).

Gonocoxae triangular, but extend inward on basal 1/3 (vs. extend outward on basal 1/3 in A. rufus). Setae dense along apical edge of VIIIth ventrite of abdomen, but much denser and shorter (vs. less dense and longer setae on apical edge of VIIIth ventrite of abdomen in A. biplagiatus).

A. yuae hosts Chionanthus ramiflorus Roxb. This species appears to be univoltine. Larvae were found only in late March. Epithet after Su-Fang Yu (余素芳), the first person to collect the specimen. Distribution is endemic to Lanyu Island.

Adults are inseparable from A. rufus except by genital characters, including parallel-sided apex of the aedeagus with anterior opening very close to the apex of the aedeagus, from 1/12–3/5 apical (vs. apically narrowed aedeagus with anterior opening not so close to the apex of the aedeagus, from 1/8–3/5 apical in A. rufus).

The apical margin of the VIII ventrite of the abdomen is deeply notched in females (vs. the apical margin of the VIII ventrite of the abdomen is shallowly notched in females of A. rufus). The new species is restricted to Lanyu Island and is geographically isolated from other species. Larvae and adults feed on leaves of C. ramiflorus but not O. fragrans. Thus, both species are ecologically allopatric because O. fragrans is one of the host plants for A. rufus.

Original research

Lee C-F, Chiang M-Y, Suenaga H (2024). The genus Argopistes Motschulsky from Japan and Taiwan, with descriptions of three new species from Taiwan (Coleoptera, Chrysomelidae, Galerucinae, Alticini). ZooKeys 1215: 151-183, DOI:10.3897/zookeys.1215.134871

Dlium theDlium
Labels:

Popular Posts

Humpback whales (Megaptera novaeangliae) manufacture bubble-nets as tools to increase prey intake

NEWS - Humpback whales ( Megaptera novaeangliae ) create bubble net tools while foraging, consisting of internal tangential rings, and actively control the number of rings, their size, depth and horizontal spacing between the surrounding bubbles. These structural elements of the net increase prey intake sevenfold. Researchers have known that humpback whales create “bubble nets” for hunting, but the new report shows that the animals also manipulate them in a variety of ways to maximize catches. The behavior places humpbacks among the rare animals that make and use their own tools. “Many animals use tools to help them find food, but very few actually make or modify these tools themselves,” said Lars Bejder, director of the Marine Mammal Research Program (MMRP), University of Hawaii at Manoa. “Humpback whales in southeast Alaska create elaborate bubble nets to catch krill. They skillfully blow bubbles in patterns that form a web with internal rings. They actively control details such ...
Read more

Javan mocca or Javan slender caesar (Amanita javanica)

OPINION - Javan mocca or Javan slender caesar ( Amanita javanica ) is a mysterious fungus species and has been enigmatic since it was first reported by Boedijn in 1951 and after that no explanation or reporting of specimens is believed to be the same as expected. Boedijn (1951) described A. javanica which grew on Java island as having the characteristics covered in the Amanita genus. Corner and Bas in 1962 tried to describe Javan mocca and all species in Amanita based on specimens in Singapore. Over time some reports say that they have found A. javanica specimens in other Southeast Asia including also China, Japan, India and Nepal. But there is no definitive knowledge and many doubt whether the specimen is the same as described by Boedijn (1951). I was fortunate to have seen this species one afternoon and soon I took out a camera for some shots. In fact, I've only met this mushroom species once. Javan mocca is an endangered species and I have never seen in my experience in...
Read more

Asian palmyra palm (Borassus flabellifer)

Asian palmyra palm ( Borassus flabellifer ) is a species of Arecaceae, palm, sturdy, single-stemmed, cylindrical shape, growing 15-30 meters tall and with a trunk diameter of about 60 cm. The leaves are clustered at the tip of the trunk, forming a rounded crown. The leaf blade resembles a round fan, up to 1.5 meters in diameter. The leaflets are 5-7 cm wide, and the underside is whitish with a waxy coating. The leaf stalk is up to 1 meter long, with a broad, black midrib at the top and a row of two-pointed spines. The inflorescence is borne on a cob, 20-30 cm long, and the stalk is about 50 cm long. The fruits are clustered in clusters of about 20, round, 7-20 cm in diameter, with a brownish-black outer skin and yellow flesh on the inside. The fruit has three seeds in a thick, hard shell. Kingdom: Plantae Phylum: Tracheophyta Subphylum: Angiospermae Class: Liliopsida Order: Arecales Family: Arecaceae Subfamily: Coryphoideae Tribe: Borasseae Subtribe: Lataniinae Genus: Borassus Speci...
Read more