Research Article |
Corresponding author: Elijah J. Talamas ( billy.jenkins@GMAIL.COM ) Academic editor: Matthew Yoder
© 2019 Keloth Rajmohana, James P. Sachin, Elijah J. Talamas, Mukundan S. Shamyasree, S. K. Jalali, Ojha Rakshit.
This is an open access article distributed under the terms of the Creative Commons Attribution License (CC BY 4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
Citation:
Rajmohana K, Sachin JP, Talamas EJ, Shamyasree MS, Jalali SK, Rakshit O (2019) Paratelenomus anu Rajmohana, Sachin & Talamas (Hymenoptera, Scelionidae): description and biology of a new species of phoretic egg parasitoid of Megacopta cribraria (Fab.) (Hemiptera, Plataspidae). In: Talamas E (Eds) Advances in the Systematics of Platygastroidea II. Journal of Hymenoptera Research 73: 103-123. https://doi.org/10.3897/jhr.73.34262
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Paratelenomus anu Rajmohana, Sachin & Talamas, sp. nov. (Hymenoptera: Scelionidae) is an egg parasitoid of the kudzu bug, Megacopta cribraria (Fab.) (Hemiptera: Plataspidae). It is morphologically and genetically distinct from P. saccharalis (Dodd), a well-known egg parasitoid of the same host. Paratelenomus anu is here described from India and diagnosed from other species of Paratelenomus Dodd. This parasitoid can be reared easily, has high rates of parasitism, and thus may be significant for the biological control of M. cribraria. Phoresy is documented in P. anu and provides the first known example of this behavior in Paratelenomus. Paratelenomus longus (Kozlov & Lê) syn. nov. and P. mangrovus Rajmohana & Narendran, syn. nov. are treated as junior synonyms of P. tetartus (Crawford), and P. obtusus (Lê) syn. nov. is treated as a junior synonym of P. saccharalis.
kudzu bug, phoresy, India, invasive species, biological control
Megacopta cribraria (Fab.) (Hemiptera: Plataspidae), commonly called the kudzu bug, the lablab bug, the bean plataspid, or the globular stink bug, is native to Asia, including the Indian subcontinent, and Australia (
Surveys were conducted at five different localities in Calicut district, in the South Indian state of Kerala, from June 2015 until 2017, where Lablab purpureus (L.) plants were grown and incidence of M. cribraria was noticed (Table
Egg emergence data for nymphs of Megacopta cribraria and adults of Paratelenomus anu by egg mass.
Locality | Date eggs were laid | # of eggs in mass | # of days until first emergence | # of male P. anu emerged | # of female P. anu emerged | # of nymphs emerged | # of unhatched eggs |
---|---|---|---|---|---|---|---|
Calicut – Malaparamba near providence college, Lat. 11.292975 Long -75.803572 | 9/6/15 | 22 | 13 | 2 | 16 | 3 | 1 |
12/6/15 | 24 | 12 | 3 | 12 | 2 | 7 | |
16/6/15 | 18 | 12 | 1 | 13 | 4 | 0 | |
27/6/15 | 16 | 12 | 3 | 8 | 2 | 3 | |
8/7/15 | 26 | 13 | 4 | 16 | 1 | 5 | |
16/7/15 | 24 | 12 | 3 | 17 | 3 | 1 | |
24/7/15 | 18 | 13 | 2 | 12 | 0 | 4 | |
27/7/15 | 24 | 14 | 1 | 17 | 0 | 6 | |
28/7/15 | 26 | 13 | 2 | 18 | 5 | 1 | |
1/8/15 | 24 | 13 | 3 | 18 | 0 | 3 | |
6/8/15 | 16 | 13 | 2 | 10 | 0 | 3 | |
6/8/15 | 22 | 12 | 4 | 14 | 2 | 2 | |
20/8/15 | 24 | 13 | 4 | 16 | 3 | 1 | |
20/8/15 | 20 | 13 | 1 | 14 | 2 | 3 | |
26/8/15 | 22 | 13 | 3 | 16 | 2 | 1 | |
Calicut University, Lat. 11.131442 Long -75.894595 | 6/10/15 | 28 | 14 | 2 | 16 | 4 | 6 |
6/10/15 | 26 | 14 | 3 | 17 | 2 | 4 | |
6/10/15 | 38 | 13 | 4 | 22 | 7 | 5 | |
6/10/15 | 36 | 14 | 2 | 30 | 2 | 2 | |
6/10/15 | 24 | 12 | 1 | 17 | 3 | 3 | |
6/10/15 | 28 | 13 | 2 | 20 | 0 | 6 | |
12/10/15 | 24 | 12 | 2 | 16 | 0 | 6 | |
12/10/15 | 26 | 13 | 2 | 18 | 5 | 1 | |
12/10/15 | 24 | 14 | 3 | 18 | 0 | 3 | |
8/12/15 | 22 | 12 | 1 | 15 | 2 | 4 | |
8/12/15 | 16 | 14 | 2 | 11 | 0 | 3 | |
8/12/15 | 24 | 13 | 3 | 14 | 4 | 3 | |
Koylandi- Nelluli tazham, Lat. 11.472937 Long -75.676152 | 8/12/16 | 22 | 13 | 3 | 12 | 3 | 4 |
8/12/16 | 16 | 14 | 1 | 11 | 1 | 3 | |
8/12/16 | 16 | 14 | 2 | 9 | 0 | 5 | |
8/12/16 | 10 | 12 | 1 | 7 | 0 | 2 | |
8/12/16 | 30 | 13 | 4 | 13 | 9 | 4 | |
8/12/16 | 27 | 13 | 3 | 18 | 3 | 3 | |
8/12/16 | 32 | 14 | 2 | 21 | 4 | 5 | |
8/12/16 | 29 | 12 | 3 | 17 | 5 | 4 | |
Kunnamangalam Markaz, Lat. 11.306922 Long -75.894595 | 3/9/16 | 22 | 14 | 2 | 11 | 3 | 6 |
3/9/16 | 24 | 14 | 3 | 15 | 4 | 2 | |
3/9/16 | 18 | 13 | 2 | 12 | 1 | 3 | |
3/9/16 | 25 | 12 | 3 | 13 | 5 | 4 | |
6/9/16 | 12 | 14 | 1 | 8 | 0 | 3 | |
6/9/16 | 14 | 12 | 2 | 8 | 0 | 4 | |
6/9/16 | 20 | 13 | 1 | 16 | 0 | 3 | |
6/9/16 | 25 | 14 | 4 | 14 | 2 | 2 | |
Palayattunada Maniyoor Rd Pathiyarakkara Kerala India, Latitude: 11.573128 Longitude: 75.617743 | 2/2/17 | 10 | 12 | 1 | 6 | 0 | 3 |
2/2/17 | 24 | 13 | 2 | 16 | 2 | 4 | |
2/2/17 | 25 | 14 | 4 | 15 | 3 | 3 | |
2/2/17 | 26 | 13 | 3 | 14 | 5 | 4 | |
2/2/172/2/17 | 26 | 13 | 2 | 17 | 0 | 7 | |
2/2/17 | 28 | 14 | 3 | 17 | 5 | 3 | |
2/2/17 | 29 | 13 | 4 | 18 | 3 | 4 | |
2/2/17 | 30 | 14 | 3 | 15 | 7 | 5 | |
2/2/17 | 22 | 12 | 2 | 14 | 3 | 3 | |
9/2/17 | 36 | 14 | 3 | 23 | 4 | 6 | |
9/2/17 | 40 | 14 | 4 | 27 | 2 | 7 | |
9/2/17 | 17 | 13 | 1 | 9 | 3 | 4 | |
9/2/17 | 23 | 13 | 2 | 15 | 2 | 4 | |
18/2/17 | 18 | 12 | 2 | 13 | 0 | 3 | |
18/2/17 | 14 | 14 | 2 | 9 | 0 | 3 | |
18/2/17 | 12 | 14 | 1 | 8 | 0 | 3 | |
18/2/17 | 12 | 13 | 1 | 6 | 2 | 3 | |
Nallalam-padam bus stop, Lat 11.258753N Long 75.780411E | 19/7/18 | 66 | 14 | 9 | 37 | 10 | 10 |
The preserved wasps were glued to the tip of point cards and examined with Leica M 205A and Zeiss V8 stereo microscopes. Extended-focus images were produced with two systems: a Leica DFC 500 camera attached to a Leica M 205 A stereomicroscope with images combined using the Leica Application Suite, and a Macroscopic Solutions Macropod Micro Kit with images combined in Helicon Focus. Scanning electron microscopy was performed with a Hitachi SU6600 Variable Pressure Field Emission Scanning Electron Microscope (FESEM) and a Hitachi TM3000 Tabletop Microscope.
The data associated with these specimens is deposited in the Hymenoptera Online Database (hol.osu.edu). The online systematics and taxonomy tool, vSysLab (vsyslab.osu.edu), was used to generate the material examined sections and taxonomic synopses. Morphological terms were matched to concepts in the Hymenoptera Anatomy Ontology using the text analyzer function and a table of these terms and URI links is provided in Suppl. material
This study is based on specimens deposited in the following institutions.
ZSIK National Zoological Collection, Zoological Survey of India, Calicut, India
DNA was extracted from the whole insect using Qiagen DNeasy kit, following the manufacturer’s protocols. The extracts were subjected to PCR amplification of a 658 bp region near the 5’ terminus of the CO1 gene following standard protocol (
Body length. Female: 0.65–0.71mm. Male: 0.66–0.68mm.
Color. Body black to honey brown; first metasomal tergite slightly xanthic, weakly contrasting with posterior metasomal segments; antenna and legs yellow to brown; wings hyaline; wing venation brown.
Head. Frons mostly smooth with coriaceous sculpture dorsally; central keel attenuated dorsally, not bifurcating around median ocellus; submedian carina absent; orbital carina present; a single row of equidistant setae present along orbital carina; gena dorsally coriaceous, as on vertex, but smooth toward mandibular articulation; occipital carina incomplete medially; crenulae arising from occipital carina short; labrum pentagonal, slightly more than 2× wider than long, apex bidentate medially; antennal clava 4-merous; claval formula A11–A8: 1-2-2-1; A5 in males with tyloid.
Mesosoma. Notauli absent to weakly present posteriorly; mesoscutum with coriaceous sculpture; parapsidal lines present; mesoscutal humeral sulcus and mesoscutal suprahumeral sulcus indicated by cells; transscutellar articulation narrowed medially, wider and crenulate laterally; foveae of posterior mesoscutellar sulcus of uniform size; mesoscutellum abutting mesoscutum medially; disc of mesoscutellum semicircular, with coriaceous sculpture; setal bases on mesoscutellum simple, not pustulate; metascutellum rugulose; mesopleural carina absent; intercoxal space narrow, not completely occluded by postacetabular and mesopleural epicoxal sulci; acetabular field small, finely setose, and coriaceous; episternal fovea present; femoral depression weakly indicated; prespecular sulcus present; metapleural triangle present; metapleural carina present; paracoxal sulcus absent; posterodorsal metapleural sulcus present.
Paratelenomus anu 4 female (FSCA 00090272) mesosoma, dorsal view 5 holotype female (ZSI/WGRS/I.R-INV.5069) lateral habitus 6 female paratype (CNC494970), head, mesosoma, metasoma, dorsal view 7 female paratype (FSCA 00090272), head, anterior view 8 female paratype (CNC494969), head and mesosoma, lateral view. Scale bars: in millimeters.
Metasoma. T1 longitudinally costate, with two lateral setae; T2 striate, striae absent in lateral and posterior portions of tergite.
Male. Similar to female, except antennae filiform and metasoma with 8 external tergites and 7 external sternites.
Paratelenomus anu does not fully follow either lead of the first couplet in the key to species of Paratelenomus by
The species is named ‘anu’ because of its small size. (In Sanskrit ‘anu’ is the equivalent for the smallest unit of matter). The name is treated as a noun in apposition.
Holotype, female: INDIA: Kerala St., Malapparamba, near Providence College, 9.VI.2015, J. Sachin, ZSI/WGRS/I.R-INV.5069 (deposited in
A central keel that dorsally bifurcates around the medial ocellus was listed by
The CO1 sequence of Paratelenomus anu (KT896660.1) was analyzed using the online BLAST tool of NCBI for comparison with other sequences in the GenBank database. We found P. anu showed 85% sequence identity with P. saccharalis (KC778442.1) with 520/628 identities, and 7 gaps that accounted for about 1% of the total alignment length. This degree of sequence divergence is congruent with treatment of P. saccharalis and P. anu as separate species.
The host eggs collected from all locations contained both parasitized and unparasitized eggs. In the laboratory, M. cribraria nymphs emerged from almost all unparasitized eggs within five days of collection, while the parasitoids emerged within 11–13 days. Male wasps were usually the first to emerge and remained on the egg mass for emergence of the females, with which they immediately mated for 12–15 sec. Following copulation, males continued waiting for the emergence of additional females. Among all the egg batches collected, the maximum number of males that emerged from an egg mass was four. Each egg mass had an average of 22.97 ± 6.41 eggs. The percent emergence of male and female parasitoids was 10.3 % and 63.2 % whereas the remainder (26.4%) were nymphs. This female-biased sex ratio enhances the potential of this parasitoid to be developed as a biocontrol agent against M. cribraria (
Comparison of emergence rates of Megacopta cribraria nymphs and adults of Paratelenomus anu from laboratory-reared and field-collected egg masses. Percentages in parentheses are based on total number of eggs.
Locations | # of egg masses | total # of eggs | total # of nymphs emerged | total # of P. anu emerged | total # of male egg parasitoids emerged | total # of female egg parasitoids emerged | total # of unhatched eggs |
---|---|---|---|---|---|---|---|
Laboratory | 31 | 686 | 52 (7.58%) | 521 (75.95%) | 67 (9.77%) | 454 (66.18%) | 165 (24.05%) |
Field | 64 | 1473 | 153 (10.39%) | 1086 (73.73%) | 150 (10.18%) | 936 (63.54%) | 387 (26.27%) |
The parasitism rate was 73.7 ± 7.3% for field-collected egg masses and 75.9 ± 3.5% for egg masses reared in the laboratory. Among the parasitized egg masses, nymph emergence was 10.39% for field-collected eggs and 7.58% in the laboratory (Table
Telenomus saccharalis Dodd, 1914: 293 (original description).
Aphanurus Graeffei
Kieffer, 1917: 343 (original description);
Liophanurus saccharalis
(Dodd):
Microphanurus graeffei
(Kieffer):
Asolcus minor
Watanabe, 1954: 20, 21 (original description. Keyed);
Aporophlebus graeffei
(Kieffer):
Archiphanurus graeffei
(Kieffer):
Archiphanurus obtusus
Lê, 1982: 145 (original description);
Archiphanurus minor
(Watanabe):
Paratelenomus saccharalis
(Dodd):
Aporophlebus minor
(Watanabe):
Paratelenomus graeffei
(Kieffer):
Paratelenomus minor
(Watanabe):
Paratelenomus obtusus
(Lê) syn. nov.:
Holotype, female, Archiphanurus obtusus: VIETNAM: Hanoi Prov., Hanoi, 29.V.1979,
Our synonymy of Paratelenomus obtusus (Lê) is based on photographs of the holotype specimens provided by
Dissolcus tetartus
Crawford, 1911: 270 (original description);
Trissolcus tetartus
(Crawford):
Archiphanurus tetartus
(Crawford):
Paratelenomus tetartus
(Crawford):
Archiphanurus longus
Kozlov & Lê syn. nov.:
Archiphanurus longgus
Kozlov & Lê:
Paratelenomus mangrovus Rajmohana & Narendran syn. nov., 2007: 2522, 2523 (original description, keyed).
Holotype, female, Dissolcus tetartus: INDONESIA: Sumatera Utara Prov., Sumatra Isl., Deli Land, Medan, no date, reared from egg, L. P. de Bussy, USNMENT00989067 (deposited in
The synonymy of Paratelenomus longus (Kozlov & Lê) is based on photographs of the holotype specimen provided by
Paratelenomus tetartus 17 female holotype of P. tetartus (USNMENT00989067), anterolateral view 18 female holotype of P. longus (
28 Paratelenomus angor, paratype female (OSUC 398127), head, anterior view 29 Paratelenomus angor, paratype female (OSUC 398127), head, mesosoma, T1–T2, dorsal view 30 Paratelenomsu matinalis, paratype female (OSUC 398195), head, anterior view 31 Paratelenomus matinalis paratype female (OSUC 398195), head, mesosoma, T1–T2, dorsal view 32 Paratelenomus striativentris female (OSUC 398273), head, anterior view 33 Paratelenomus striativentris female (OSUC 398273), head, mesosoma, T1–T2, anterior view. Scale bars: in millimeters.
Treatment of P. mangrovus as a junior synonym follows reexamination of the holotype of this species and reevaluation of the characters used by Rajmohana & Narendran (2007) to separate it from P. tetartus. Specifically, the length of the orbital carina and the proximity of the cells of the postacetabular and mesopleural epicoxal sulci are variable. The lateral habitus image of the holotype of P. mangrovus (Fig.
There remain two species of Paratelenomus, P. aculus (Lê) and P. irritus (Lê), for which the species concepts are unclear.
Phoresy is common in the arthropod world (
Phoresy has now been documented in several scelionid genera: Synoditella Muesebeck, Sceliocerdo Muesebeck, and Scelio Latreille on grasshoppers (Acrididae) (Lanhams and Evans 1958,
The first author is thankful to Dr. Kailash Chandra, director of the Zoological Survey of India for all support extended. The second author is thankful to the Department of Science and Technology- Fund for Improvement of Science and Technology Infrastructure (2014) for providing financial support to adequately equip the laboratory. We are grateful to the principal of Malabar Christian College, Calicut, for providing infrastructure and encouragement; to Dr. Lubomír Masner (
URI table of HAO morphological terms
Data type: Microsoft Excel Spreadsheet (.xlsx)
Explanation note: This table lists the morphological terms used in this publication and their associated concepts in the Hymenoptera Anatomy Ontology
Barcode sequence of CO1 for Paratelenomus anu
Data type: Microsoft Word Document (.docx)