Research Article
Research Article
DNA barcoding and hypopygium shape support delimitation of sympatric Dissomphalus species (Hymenoptera, Bethylidae) from the Atlantic rainforest
expand article infoMarina Monjardim, Celso O. Azevedo, Valeria Fagundes§
‡ Universidade Federal do Espírito Santo, Vitoria, Brazil
§ Universidade Federal do Espírito Santo, Vitória, Brazil
Open Access


Dissomphalus is a cosmopolitan genus of Bethylidae and has 269 Neotropical species divided into 32 species-groups, mostly defined by the genital and the tergal process structures. Dissomphalus rectilineus and D. concavatus are sympatric species in the ulceratus species-group. Members of the species-group share many similarities in the morphology of the head, hypopygium, tergal process and genitalia, but may be distinguished by the structure of the hypopygium. Previous studies have found intermediate structures of the hypopygium in the sympatric areas and raised questions about the distinctiveness of these two species. We sequenced 340 bp of the mitochondrial gene cytochrome oxidase I of 29 specimens from Brazil and Paraguay, calculated the genetic divergence among specimens, and recovered the phylogenetic relationships between taxa. In addition, we compared the morphology of the hypopygium to evaluate its use as a species-specific diagnostic character using the genetic divergence values. We recovered three well-supported monophyletic groups (intraclade divergence from 1.3 to 13.4%) and three hypopygium morphologies associated with each clade, two of them associated with D. rectilineus and D. concavatus (as described in the literature); the third one is new, not associated with any known species. The divergence between the D. rectilineus and D. concavatus clades was 19%, while the third clade is divergent from each species by 19–20%. If fully described, the hypopygium shape associated with the COI sequence will represent an extremely promising approach to the diagnosis of Dissomphalus species.


COI, genetic diversity, molecular systematics, new species, wasps


Dissomphalus Ashmead, 1893 (Pristocerinae) is the most species-rich genus of Bethylidae currently comprising 424 species worldwide (Azevedo et al. 2018). In the Neotropical region, almost 270 species of Dissomphalus were organized into 32 species -groups defined mostly based on the morphological variation of the tergal process and, in a few cases, on the genitalia (Azevedo 2000, 2001; Alencar and Azevedo 2006, 2008; Redighieri and Azevedo 2006; Colombo and Azevedo 2016; Colombo et al. 2018). Most of the morphological approaches to Dissomphalus species diagnosis use genitalia structure (Mugrabi and Azevedo 2013, 2016; Brito and Azevedo 2017) but a few species are delimited by characters other than genitalia. One of these cases involves two species of the ulceratus species-group, D. concavatus Azevedo, 1999 and D. rectilineus Azevedo, 1999, which are separated by the shape of the hypopygium, but with indistinguishable genitalia (Azevedo 1999; Redighieri and Azevedo 2006). Redighieri and Azevedo (2006) had mentioned that some specimens of D. rectilineus resembled D. concavatus, with the posterior margin of the hypopygium slightly incurved, the paramere with the dorsal margin well developed, and the apex with four small, rounded teeth. Nevertheless, little was done to solve the ambiguity of identification of these specimens. The authors stated the need for additional work in this group to better understand its diversity. The use of integrative analyses, including DNA sequencing of the mitochondrial gene cytochrome oxidase I (COI) has been useful to identify cryptic species in Hymenoptera (Griffiths et al. 2001; Hebert et al. 2003; Haine et al. 2006; Smith et al. 2009; Santos et al. 2011; Veijalainen et al. 2011; Gebiola et al. 2012; Williams et al. 2012). Thus, we used COI sequences and hypopygium structure to evaluate the species limits of D. rectilineus and D. concavatus from the Atlantic rainforest, and to understand if those variations hold any utility for identification of these species in the group.

Material and methods

From a set of 156 individuals identified by the genitalia and hypopygium shape as D. rectilineus and D. concavatus, we successfully obtained sequences of 29 individuals (25 D. rectilineus and four D. concavatus) from six localities in Brazil and one in Paraguay (Fig. 1). These specimens are deposited in the Entomological Collection of Universidade Federal do Espírito Santo (UFES), Vitória, Brazil and sequences are deposited in GenBank at (see Appendix I for details). As an outgroup we used sequences of three species of Dissomphalus from Thailand which were available in our lab from previous studies: D. thaianus Terayama, 2001 (T1097); D. wusheanus Terayama, 2001 (T2810); and D. chiangmaiensis Terayama, 2001 (T3104).

Figure 1. 

Locations of the samples in Brazil and Paraguay (see Appendix I for geographic coordinates).

We removed the hypopygium from the genitalia and took at least 20 photographs of each at 9.2 × magnification with the in EntoVision system (GTVision), then compiled the images in the Helicon Focus v5.3.7. The map was generated in the program QGIS 2.18.18.

We obtained genomic DNA from the metasoma or genitalia using the DNA MACHEREY-NAGEL NucleoSpin Tissue kit following the maker’s protocol, with a final suspension volume of 40 µl. Since mini-barcodes are short informative regions of COI that are useful for degraded DNA samples, as obtained from pinned-specimens from museums (Hajibabaei and McKenna 2012; Leray et al. 2013; Tucker et al. 2015; Tucker and Sharkey 2016), we amplified the 340 bp of the final portion of the mitochondrial gene cytochrome oxidase I (mini-COI) by PCR using the primers HCO 2198 designed by Folmer et al. (1994) and AP-L-2176F designed by Pedersen (1996). For the PCR reactions we used a ABI Veriti Thermal Cycler in mixtures containing 3 µl of genomic DNA, 2.5 µl of 10× Taq buffer, 5 mM dNTP mix, 75 mM MgCl2, 2.5 mM of each primer, 1U Platinum Taq DNA Polymerase (Invitrogen, Inc.), and distilled water to bring the final volume of 25 µl. The PCR profile consisted of initial denaturation at 94 °C for 5 min, followed by 40 cycles of denaturation at 94 °C for 45 secs, annealing at 47 °C for 45 secs, extension at 72 °C for 45 secs, and a final extension at 72 °C for 5 min. In order to improve the success of PCR amplifications, a second PCR reaction was performed using 0.5 µl of the first PCR product as template, reducing to 30 cycles of thermal cycling. We detected the success of the amplifications on the 2% TBE agarose gel. The PCR products were purified using an ExoSAP-IT kit (USB Corporation) and the DNA was sequenced with an ABI3700 Genetic Analyser (Applied Biosystems, Foster City, CA) using the BigDye Terminator protocol (Applied Biosystems) at the Núcleo de Genética Aplicada à Conservação da Biodiversidade (NGACB) in UFES. Sequences were checked for the correct loci amplification and taxonomy using the Basic Local Alignment Tool (BLAST; Altschul et al. 1990) from GenBank database. Sequences were aligned using MEGA v5.05 (Tamura et al. 2011) using the ClustalWv2.0 algorithm (Larkin et al. 2007). The number of haplotypes (nH), the number of polymorphic sites (s), haplotype diversity (HD) and the nucleotide diversity (π) were estimated using the program DnaSP v5.0 (Librado and Rozas 2009). The genetic divergences between and within groups/clades were calculated using the Tamura and Nei model, with gamma correction and tested with 10,000 permutations using MEGA v5.0 (Tamura et al. 2011). The phylogenetic analyses were inferred using Bayesian Inference (BI) and Maximum-Likelihood (ML). The evolutionary model was determined by JModeltest v0.1 (Posada 2008). BI trees were generated using the software MrBAYES 3.1.2 (Ronquist and Huelsenbeck 2003). The Markov chain was conducted with three million generations with burn-in of 25%, sampling every hundred generations using the evolutionary model proposed by JModeltest. Statistical branch support was obtained through posterior probabilities (PP), and the reliability of the clades was accepted according to the proposal by Hillis and Bull (1993), as following: strong (> 0.95) and moderate (0.85–0.95). The ML analyzes were generated by the PHYML 3.0 platform (Guindon et al. 2010), with 100,000 generations and the evolutionary model best suited calculated by JModeltest. The best evolutionary model for the data matrix using the Akaike correction was GTR + G (Gamma = 0.4510; frequencies of nucleotide bases A = 0.3694, C = 0.1092, G = 0.1485 and T = 0.3728). For the BIC criterion, the best evolutionary model was HKY + G, (transcription rate / transversion = 1.0044, the parameter gamma = 0.3890 and the frequency of nucleotide bases were A = 0.4088, C = 0.0706, G = 0.1273 and T = 0.3933). Branch support was obtained through bootstrapping (BT), and the reliability of the Rambclades was accepted following Hillis and Bull (1993) as follows: strong (> 70%) and moderate (50–70%). The phylogenetic trees were edited with FIGTREE v1.4.2 (


The 29 successfully amplified COI sequences with 304 bp (18.6%) generated 16 haplotypes that were locality-specific (Appendix I). The ML and BI phylogenetic trees showed a similar topology (Fig. 2A) recovering three well-supported clades (BT = 70–100, PP = 0.8–1). The within-clade genetic distances varied from 1.3% for clade III, 7.7% for clade I and 13.4% for clade II, while the between-clade divergences varied from 19 to 20%. We calculated the genetic divergence of 28% between the ingroup vs. the outgroup. Twenty-three out of 29 sequences recovered clade I, with specimens from Bahia (BA) to Rio Grande do Sul (RS) in Brazil and one location in Paraguay, showing 16 haplotypes. Three sequences of specimens from Nova Iguaçu (RJ) recovered clade III with two haplotypes; while three sequences of specimens from Alfredo Chaves (ES) recovered clade II, each one with a distinct haplotype (Fig. 2, Appendix I).

Figure 2. 

A bayesian consensus tree generated from the 304-bp COI from 29 representatives of the species complex. Posterior probabilities (PP) and bootstrap (BT) indicated above branches. The species D. thaianus, D. wusheanus and D. chiangmaiensis were used as outgroups to root the tree B–D hypopygium magnified 9.2×, corresponding to each clade.

We detected three distinct hypopygium shapes, each of them associated with a clade (Fig. 2B–D). The hypopygium associated with clade I showed a straight posterior margin, and a narrower base of the stalk, which is similar to that described by Azevedo (1999) for D. rectilineus. The hypopygium associated with clade II is much more robust and angular than the others, with the posterior margin clearly incurved, which is associated with D. concavatus. The hypopygium associated with clade III was more elongated than the other two, and the trapezoidal plate has the stalks extremely long with the end enlarged, distinct from any other hypopygium described in this group.


Our phylogenetic analysis showed that specimens originally identified as D. rectilineus were arranged over two well-supported monophyletic groups (clades I and III) with 19% of divergence. Clade I grouped 23 individuals from Bahia to Rio Grande do Sul in Brazil and in Paraguay, with an intraclade divergence of 7.7%, while clade III grouped three specimens from Espírito Santo with an intraclade divergence of 1.3%. Three specimens originally identified as D. concavatus were grouped as a single monophyletic lineage (clade II), which led us to assume that each clade corresponds to a well-supported species, with genetic distance of 19–20%, consistent with species-level divergence. The genetic divergence values of COI herein recovered for these closely related species were surprisingly high compared to the values mentioned by Hebert et al. (2003), but similar to those found in other parasitoid wasp studies, that registered variation from 4.4% to 26% (Haine et al. 2006; Moe and Weiblen 2010; Sun et al. 2011; Veijalainen et al. 2011; Vink et al. 2012).

Distinguishing between D. rectilineus and D. concavatus is difficult due to their sympatric distribution and shared morphological characters which overlap in several important structures. Dissomphalus concavatus was described with the posterior margin of the hypopygium incurved and the base of the stalk widened, whereas D. rectilineus has a posterior margin straight and a narrower base of the stalk (Azevedo 1999). The ulceratus species-group was diagnosed by having the basal portion of the dorsal margin of the paramere well developed and is currently composed of four species in the central-eastern region of South America, showing some sympatry in Brazil: D. concavatus in Espírito Santo, São Paulo and Paraná states and Distrito Federal; D. rectilineus in Espírito Santo, Rio de Janeiro, São Paulo and Paraná states and D. dentiformis Azevedo, 1999 in Distrito Federal; and D. ulceratus Evans, 1969 was recorded in Tucuman, Argentina. Nevertheless, even though we identified the specimens herein as D. rectilineus and D. concavatus, our analysis indicated three well-defined, distinct monophyletic groups, with high divergence, each of them with unique and exclusive polymorphisms.

Thus, we are inclined to assume that clade III representatives were consistent with a new species of the ulceratus species-group in Espírito Santo, with the hypopygium characteristics distinct from any other recognized forms of hypopygium described for Dissomphalus, mainly defined by having the posterior margin straight, and stalk with the base very wide and long. Associated with high genetic divergence, there is enough evidence from morphological and genetic analyses to support this clade as a distinct species within the analyzed specimens. This species belongs to the ulceratus species-group because of the morphology of the tergal process (see Azevedo 1999), but its genitalia and the general body morphology is different from all species of this group; it will be formally described in a future taxonomic revision.

The hypopygium helps to evert the genitalia through inserted muscles from the tip of the stalk to the tip side of the median stalk (Schulmeister 2001). The bristles on the hypopygium seem to have a sensorial function, used to determine the position of the genitalia (Austin and Dowton 2000).

The hypopygium structure allowed the distinction of specimens as either D. rectilineus or D. concavatus (Azevedo 1999), but Redighieri and Azevedo (2006) mentioned the posterior margin of hypopygium was slightly incurved for some specimens of D. rectilineus from Espírito Santo, which coincides with the structure of the hypopygium described for clade III. In other studies, the Dissomphalus species (including new descriptions) were defined by the posterior margin of the plate but a few were associated with the length of the median stalk, the base width of the median stalk and the degree of concavity (Azevedo 1999; Azevedo 2003; Redighieri and Azevedo 2006).

In this study, three individuals from Alfredo Chaves (ES) were not previously identified by hypopygium (UFES 08856, UFES 08925 and UFES 08852) but due to the robustness of the clades, we were able to classify them undoubtedly as D. rectilineus, showing the importance of integrative analyses for specimens’ identification in the group. The implementation of DNA barcoding is helping to solve taxonomic problems and showing that species diversity is still underestimated (Griffiths et al. 2001; Hebert et al. 2003; Haine et al. 2006; Smith et al. 2009; Santos et al. 2011; Veijalainen et al. 2011; Carolan et al. 2012; Gebiola et al. 2012; Williams et al. 2012; present study). Due to the sharp decline in global biodiversity, methods of analysis and species identification that show, more reliably, the richness of biodiversity are of great importance. The integration of molecular and morphological methods can help to accelerate the biodiversity inventory and facilitate the identification of cryptic species, and considering museum animals, the use of mini-barcodes is a very important tool because it allows for the extraction of valuable information using degraded DNA.


Based on genetic divergence data, we concluded that Dissomphalus concavatus and D. rectilineus are distinct species, and that the delimitation based on hypopygium morphology proposed by Azevedo (1999) is cladistically supported, so that the hypopygium can be used as a diagnostic character when applicable. We also found data showing high genetic divergence (around 19–20%) indicating species-level divergence in the group, whereas 1.3–13.4% was registered as within species-level divergence. Such a finding stimulates future investigations in the group because its biodiversity appears to be underestimated. Additionally, our results support the occurrence of an unnamed species for the ulceratus species-group, distinct from the four described species.


We thank Conselho Nacional do Desenvolvimento Científico e Tecnológico (CNPq) for an undergraduate bursary to MB and the research bursaries to VF (grant 311892/2014-0) and COA (grant 303748/2018-4). This work was funded by Fundação de Amparo à Pesquisa e Inovação do Espírito Santo – FAPES (grants 52263010/2011 and 80600417/17). We also thank to Juliana Justino (Núcleo de Genética Aplicada à Conservação da Biodiversidade, NGACB) for UFES lab facilities. We are indebted to all field teams, without them this study would not be possible. We also thank the two reviewers whose comments and suggestions helped improve and clarify the manuscript. In this study the access to the genetic heritage was conducted in 2011 and is duly registered with SisGen – Sistema Nacional de Gestão do Patrimônio Genético e dos Conhecimentos Tradicionais Associados, as required by Brazilian law. The authors have declared that no competing interests exist.


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Appendix I

Species Voucher Collection Number Original ID Hypopygium shape (Fig. 1) Municipality State/Country Number in Fig. 1 Geographic coordinate COI seq. Length COI Haplotype Genbank Number
D. rectilineus UFES 13736 D. rectilineus B Santa Teresa Espirito Santo / Brazil 3 19°58.62'S, 40°32.17'W 304 1 MT602017
UFES 13738 D. rectilineus B Santa Teresa Espirito Santo / Brazil 3 19°58.62'S, 40°32.17'W 304 2 MT602018
UFES 13761 D. rectilineus B Santa Teresa Espirito Santo / Brazil 3 19°58.62'S, 40°32.17'W 304 15 MT602037
UFES 13758 D. rectilineus B Santa Teresa Espirito Santo / Brazil 3 19°58.62'S, 40°32.17'W 304 14 MT602036
UFES 08953 D. rectilineus B Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 5 MT602021
UFES 08858 D. rectilineus B Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 6 MT602022
UFES 08815 D. rectilineus B Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 6 MT602023
UFES 08856 D. rectilineus* - Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 6 MT602026
UFES 08925 D. rectilineus* - Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 6 MT602027
UFES 08852 D. rectilineus* - Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 7 MT602024
UFES 08846 D. rectilineus B Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 6 MT602025
UFES 08797 D. rectilineus B Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 9 MT602030
UFES 08818 D. rectilineus B Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 8 MT602028
UFES 08911 D. rectilineus B Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 6 MT602029
UFES 08918 D. rectilineus B Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 6 MT602031
UFES 08945 D. rectilineus B Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 10 MT602032
UFES 16400 D. rectilineus B Arroio Grande Rio Grande do Sul / Brazil 7 32°13.37'S, 53°11.95'W 304 11 MT602033
UFES 13459 D. rectilineus B Ubaitiba Bahia / Brazil 2 14°18'S, 39°19'W 304 13 MT602035
UFES 13297 D. rectilineus B Camamu Bahia / Brazil 1 14°00'S, 39°10'W 304 12 MT602034
UFES 13467 D. rectilineus B Ubaitiba Bahia / Brazil 2 14°18'S, 39°19'W 304 17 MT602039
UFES 13470 D. rectilineus B Ubaitiba Bahia / Brazil 2 14°18'S, 39°19'W 304 16 MT602038
IBES 03547 D. rectilineus B Paraguay 8 26°51.6'S, 55°32.7'W 304 3 MT602019
UFES 80567 D. rectilineus B Rio de Janeiro Rio de Janeiro / Brazil 5 22°26'S, 42°56'W 304 4 MT602020
D. concavatus UFES 08808 D. concavatus C Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 20 MT602042
UFES 08842 D. concavatus C Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 19 MT602041
UFES 08844 D. concavatus C Alfredo Chaves Espirito Santo / Brazil 4 20°27.88'S, 40°42.58'W 304 18 MT602040
Dissomphalus sp UFES 80540 D. rectilineus D Rio de Janeiro Rio de Janeiro / Brazil 5 22°26'S, 42°56'W 304 21 MT602043
UFES 13964 D. rectilineus D Nova Iguaçu Rio de Janeiro / Brazil 6 22°34.62'S, 43°26.08'W 304 22 MT602044
UFES 13963 D. rectilineus D Nova Iguaçu Rio de Janeiro / Brazil 6 22°34.62'S, 43°26.08'W 304 23 MT602045