University of FloridaSolutions for Your Life

Download PDF
Publication #EENY-533

An Asian Ground Beetle, Mochtherus tetraspilotus (MacLeay) (Coleoptera: Carabidae: Lebiini)1

Paul M. Choate2

Introduction

Mochtherus tetraspilotus (MacLeay) was first detected in southern Florida in 1992 from two specimens taken at mercury light by Vince Golia in Palm Beach Co. These specimens remained unidentified until 1999 when Danny Shpeley, of the University of Alberta, determined them to be Mochtherus. Since then specimens have been collected in Gainesville by Paul Skelley, of the Division of Plant Industry, and me, and additional specimens have been seen from light trap samples at Archbold Biological Station in Highlands County.

Description

Length 6 mm to 8 mm. Mochtherus tetraspilotus may be distinguished from other Florida Lebiini by a combination of the following characters: hind tarsomere four is not bilobed; tarsal claws with three teeth, a large outer tooth and two smaller inner teeth; mentum toothed; elytral interval three with two dorsal punctures; each elytron with two yellowish orange spots (Fig. 1); labial palpi slender; pronotum setulose (covered with short hairs, which are best viewed with side lighting). The most easily observed character is the presence of two yellowish-orange spots on each elytron. A humeral spot extends from intervals four or five to seven or eight, and a subapical spot covers intervals two to five. No other Florida Lebiini species is known with this coloration and combination of characters. Two genera containing maculate species that might be confused with this species are Plochionus and Pinacodera. However, these genera are separated from Mochtherus by their labrum being distinctly wider than long and their head lacking a long seta posterior to the submentum.

Figure 1. 

Mochtherus tetraspilotus (MacLeay) adult on sweet gum stump.


Credit:

Michael C. Thomas, Florida Department of Agriculture & Consumer Services.


[Click thumbnail to enlarge.]

Within Mochtherus only two species have yellow-orange spots, Mochtherus tetraspilotus and Mochtherus longipennis Jedlička. They may be separated by the following characters: Mochtherus tetraspilotus has pronotum wider than head, oval body shape, with sides rounded; Mochtherus longipennis has pronotum only as wide as head, body elongate, sides parallel (Jedlička 1963).

Biology and Pest Status

Little is known about the biology of this species. Members of the carabid subtribe Pericalina are known to inhabit the trunks of trees. Darlington (1968) reported a species of Mochtherus in New Guinea as occurring on recently felled logs. In Florida, we have collected specimens on recently felled logs where they actively run about, feeding on small insects. Individuals have also been taken at lights. This species occupies the same habitat as a native carabid species, Coptodera aerata Dejean. The impact of Mochtherus on Coptodera remains unknown.

The pest status of this species is unknown at present. Adult members of this group of Carabidae are known to be predators. The impact of this species on our native species remains to be determined, as does the source of introduction. Its rapid spread in Florida suggests that it may soon be found throughout the Gulf States.

Distribution

The genus Mochtherus is known from Japan, Formosa, Philippines, Borneo, Java, Sumatra, Malaya, Indo-China, Thailand, Burma, Ceylon, India, across the Malay Archipelago, New Guinea, as well as Christmas Island and Samoa. (Habu 1967; Jedlička 1963; Darlington 1968). Mochtherus tetraspilotus is known from Japan, Burma, Philippines, Laos, Taiwan, Borneo, Java, Ceylon, and India (Jedlička 1963; Habu 1967). Habu (1967) considered Mochtherus a subgenus of Dolichoctis.

Selected References

  • Darlington, PJ, Jr. 1968. The carabid beetles of New Guinea Part III. Harpalinae (Continued): Perigonini to Pseudomorphini.Bulletin of the Museum of Comparative Zoology 137: 1-253.

  • Habu, A. 1967. Fauna Japonica. Carabidae. Truncatipennes Group. (Insecta: Coleoptera). Biogeographical Society of Japan. Tokyo Electrical Engineering College Press, 338 pp.

  • Jedlička, A. 1963. Monographie der Truncatipennen aus Ostasien. Lebiinae - Odacanthinae - Brachyninae. (Coleoptera, Carabidae). Entomologische Abhandlungen und Berichte aus dem Staatlichen, Museum für Tierkunde in Dresden 28: 269-368.

Footnotes

1.

This document is EENY-533, one of a series of the Entomology and Nematology Department, Florida Cooperative Extension Service, Institute of Food and Agricultural Sciences, University of Florida. Original publication date September 2012. Revised April 2013. This document is also available as a Featured Creature at http://entomology.ifas.ufl.edu/creatures. Visit the EDIS website at http://edis.ifas.ufl.edu.

2.

Paul M. Choate, Department of Entomology and Nematology, University of Florida, Gainesville, FL 32611


The Institute of Food and Agricultural Sciences (IFAS) is an Equal Opportunity Institution authorized to provide research, educational information and other services only to individuals and institutions that function with non-discrimination with respect to race, creed, color, religion, age, disability, sex, sexual orientation, marital status, national origin, political opinions or affiliations. For more information on obtaining other UF/IFAS Extension publications, contact your county's UF/IFAS Extension office.

U.S. Department of Agriculture, UF/IFAS Extension Service, University of Florida, IFAS, Florida A & M University Cooperative Extension Program, and Boards of County Commissioners Cooperating. Nick T. Place, dean for UF/IFAS Extension.