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Research Article
Systematic review of the firefly genus Emeia Fu, Ballantyne & Lambkin, 2012 (Coleoptera, Lampyridae) from China
expand article infoCheng-Qi Zhu§|, Xiao-Dong Xu§|, Ying Zhen§|
‡ Zhejiang University, Hangzhou, China
§ Westlake University, Hangzhou, China
| Westlake Institute for Advanced Study, Hangzhou, China
Open Access

Abstract

The Luciolinae genus Emeia Fu, Ballantyne & Lambkin, 2012 is reviewed. Phylogenetic relationships based on cox1 DNA barcoding sequences from 42 fireflies and 2 outgroup species are reconstructed. The dataset included three main Lampyridae subfamilies: Luciolinae, Photurinae and Lampyrinae, and Emeia was recovered within Luciolinae. A new species, Emeia pulchra Zhu & Zhen sp. nov., is described from the wetland of Lishui, Zhejiang, China. Emeia pulchra is sister species to E. pseudosauteri from Sichuan, which is supported by morphological characters and a phylogeny based on DNA barcoding sequences. The two species are separated geographically as shown on the distribution map. A key to species of Emeia using males is provided.

Keywords

Cytochrome c oxidase subunit I, DNA barcoding, Emeia, firefly, Lampyridae

Introduction

Emeia Fu, Ballantyne & Lambkin, 2012 (Luciolinae) was established as a monotypic genus (Fu et al. 2012) with Emeia pseudosauteri (Geisthardt 2004) as the type species. Emeia pseudosauteri was first described from Mount Emei, Sichuan, China by Michael Geisthardt in the genus Curtos Motschulsky, 1845 (Geisthardt 2004), and then transferred to Emeia based on morphological evidence (Fu et al. 2012). The genus Emeia Fu, Ballantyne & Lambkin had only one species (E. pseudosauteri) recorded in China before this study. The primary phenotypic feature of Emeia was the trilobite-like larva. The thoracic and abdominal terga of Emeia larvae are distinct. The lateral thoracic tergal margins are broad, similar to those of a trilobite “cephalon”, while the abdomen is narrow and curls ventrad in the posterior part. At present, definition of the genus Emeia is based on the morphology of E. pseudosauteri, which makes it insufficient in light of the discovery of a second species.

In this study, based on specimens collected from Lishui, Zhejiang, China, we describe adults of Emeia pulchra Zhu & Zhen sp. nov. based on morphological and molecular data. We compare it with the previously described E. pseudosauteri. We also provide new information on the adult male hind wing venation of the type species E. pseudosauteri. With our detailed examination of both species, we present a systematic review of the genus Emeia and a key to species.

Materials and methods

Abbreviations

EL elytral length;

EW elytral width;

PL pronotal length;

BL body length (the sum of PL, EL and the length of the exposed portions of the head from the pronotum);

BW body width (the greatest distance across the elytra, BW=2EW);

T7, 8 abdominal tergite numbers;

V6, 7 abdominal ventrite numbers.

Adult males of Emeia pulchra Zhu & Zhen sp. nov. were collected from Jiulong National Wetland Park, Lishui, Zhejiang Province in April, 2020. The holotype and paratypes of the new species are stored at School of Life Sciences, Westlake University, Hangzhou, Zhejiang. Samples of both male and female Emeia pseudosauteri were collected from Mt. Tian Tai, Sichuan Province in April, 2021.

Habitus images were taken using a Nikon D7500 camera. Images of genitalia were taken using a Nikon D7500 camera mounted on an SZ650 microscope (Chongqing Optec Instrument Co., Ltd.) under reflection or transmission light. Images were edited using Adobe Photoshop CS6. Morphological terminology and measurements follow those decribed in Douglas (2017). The body length (BL) is the sum of the pronotal length (PL) and elytral length (EL) plus the length of the exposed portions of the head from the pronotum. The abbreviations EW and BW (BW=2EW) denote elytral width and body width, respectively (Fig. 1A). The length and width of the aedeagus and aedeagal sheath were measured under the microscope using the OLYMPUS cellSens Dimension software (v 3.1.1) (Fig. 1B). The dissected aedeagus and aedeagal sheath structures are preserved in pure glycerol in small vials with the corresponding specimens.

Figure 1. 

Measurement methods and terminology A male habitus, dorsal view B aedeagus, ventral view.

We sequenced the cox1 gene barcode fragment from Emeia pseudosauteri and E. pulchra. Specifically, total DNA of the two Emeia species was isolated using the DNeasy Blood and Tissue Kit (Zhejiang Easy-Do Biotech CO., Ltd.), according to the manufacturer’s protocol. The primers LCO 1490 and HCO 2198 (Folmer et al. 1994) were used to amplify the barcode fragments of the mitochondrial gene cytochrome c oxidase subunit I (cox1). We performed the PCR reaction in a 25 μL reaction mix containing 1× PCR buffer, 1 μL of each primer in a final concentration of 1 μM, 1 μL of template, 0.2 mM of each dNTP and 0.5 units of Taq polymerase (Takara Biomedical Technology CO., Ltd). The PCR thermal regime consisted of an initial denaturation at 95 °C for 3 min; 30 cycles of 30 s at 94 °C, 30 s at 48 °C and 30 s at 72 °C, followed by a 5 min final extension at 72 °C. PCR products were checked by electrophoresis in 1% agarose gel at 170 V for 20 min, and visualized under a UV transilluminator with nucleic acid dye (Cofitt Life Science, Hong Kong). The PCR products were cleaned using Easy Gel Extraction & Clean-up kit (Zhejiang Easy-Do Biotech CO., Ltd.). The cleaned products were sequenced with an ABI 3730XL sequencer (Applied Biosystems, California, USA) by Zhejiang Sunya Biotechnology Co., Ltd.

MEGA6 (Tamura et al. 2013) was used for phylogenetic reconstruction. Cox1 barcode sequences from three main subfamilies, i.e., Luciolinae, Photurinae and Lampyrinae, were included, and sequences from the family Rhagophthalmidae were used as an outgroup (Table 1). The maximum likelihood method was used with 1000 bootstrap replicates (Fig. 2). The phylogenetic relationships were displayed using iTOL (v6; https://itol.embl.de/). The new cox1 sequences from Emeia have been deposited in GenBank (accession numbers OK144132 and OK103803).

Table 1.

Genbank accession numbers for cox1 sequences used for the phylogenetic analysis.

Species Family Sub-family GenBank id
Pyrocoelia pectoralis Lampyridae Lampyrinae KP763467.1
Pyrocoelia rufa Lampyridae Lampyrinae AF452048.1
Pyrocoelia abdominalis Lampyridae Lampyrinae AB608766.1
Pyrocoelia atripennis Lampyridae Lampyrinae AB608767.1
Pyrocoelia discicollis Lampyridae Lampyrinae AB608768.1
Pyrocoelia fumosa Lampyridae Lampyrinae AB608769.1
Pyrocoelia matsumurai Lampyridae Lampyrinae AB608770.1
Diaphanes nubilus Lampyridae Lampyrinae MG200080.1
Diaphanes pectinealis Lampyridae Lampyrinae NC_044793.1
Photinus pyralis Lampyridae Lampyrinae KY778696.1
Ellychnia corrusca Lampyridae Lampyrinae KR483038.1
Ellychnia hatchi Lampyridae Lampyrinae JF887410.1
Pyractomena lucifera Lampyridae Lampyrinae MF640134.1
Pyractomena borealis Lampyridae Lampyrinae HQ928227.1
Pyractomena angulata Lampyridae Lampyrinae JN290381.1
Aspisoma sp. Lampyridae Lampyrinae EU009322.1
Lucidina accensa Lampyridae Lampyrinae AB608771.1
Lucidina kotbandia Lampyridae Lampyrinae FJ462784.1
Lucidota atra Lampyridae Lampyrinae HQ984304.1
Photuris pensylvanica Lampyridae Photurinae MF634963.1
Photuris quadrifulgens Lampyridae Photurinae HM433520.1
Bicellonycha lividipennis Lampyridae Photurinae KJ922151.1
Bicellonycha wickershamorum Lampyridae Photurinae EU009302.1
Pristolycus sp. Lampyridae Luciolinae MK292099.1
Sclerotia flavida Lampyridae Luciolinae KP763460.1
Sclerotia aquatilis Lampyridae Luciolinae KP763466.1
Pygoluciola dunguna Lampyridae Luciolinae MT106243.1
Pygoluciola qingyu Lampyridae Luciolinae MK292093.1
Curtos bilineatus Lampyridae Luciolinae NC_044789.1
Curtos costipennis Lampyridae Luciolinae AB608764.1
Abscondita terminalis Lampyridae Luciolinae NC_044776.1
Abscondita anceyi Lampyridae Luciolinae NC_039706.1
Emeia pseudosauteri 1 Lampyridae Luciolinae MN722654.1
Emeia pseudosauteri 2 Lampyridae Luciolinae OK103803
Emeia pulchra Lampyridae Luciolinae OK144132
Luciola italica Lampyridae Luciolinae KM448530.1
Asymmetricata circumdata Lampyridae Luciolinae NC_032062.1
Drilaster axillaris Lampyridae Ototretinae AB608756.1
Drilaster okinawensis Lampyridae Ototretinae AB608758.1
Stenocladius yoshikawai Lampyridae Ototretinae AB608759.1
Lamprigera yunnana Lampyridae incertae_sedis MG200082.1
Cyphonocerus marginatus Lampyridae Cyphonocerinae AB608754.1
Rhagophthalmus lufengensis Rhagophthalmidae DQ888607.1
Rhagophthalmus ohbai Rhagophthalmidae AB608775.1

Results

Phylogenetic analysis

The cox1 barcode sequences of E. pseudosauteri and E. pulchra share a 94% sequence identity over the 658 bp segment. The phylogeny constructed from cox1 of fireflies showed three main clades corresponding to Lampyrinae, Photurinae and Luciolinae (Fig. 2). Emeia pseudosauteri was recovered as sister to E. pulchra Zhu & Zhen sp. nov. within the subfamily Luciolinae, with strong support (100%).

Figure 2. 

Maximum likelihood cox1 gene tree of Emeia and related genera. The star highlights the new species, E. pulchra Zhu & Zhen sp. nov. Emeia pseudosauteri_1 was downloaded from GenBank (MN722654.1). Emeia pseudosauteri_2 was sequenced during this study. Bootstrap values greater than 0.7 from 1000 replicates are shown.

Taxonomic treatment

Emeia Fu, Ballantyne & Lambkin, 2012

Type species

Emeia pseudosauteri Geisthardt, 2004 (designated by Fu, Ballantyne and Lambkin 2012).

Diagnosis

(based on adult male). Emeia belongs to a group of Luciolinae in which the males have aedeagal parameres widely visible beside the phallus (Ballantyne et al. 2013). Emeia differs from Aquatica wuhana Fu & Ballantyne, 2010 and A. lateralis Motschulsky, 1860, which have black marks on the pronotum (Fu et al. 2010). Emeia is distinguished from Curtos Motschulsky, 1845, as the species in Curtos have a distinctive longitudinal elytral humeral carina and parameres unequal in length (Fu et al. 2012). Emeia is closely related to Pygoluciola based on our cox1 phylogeny (Fig. 2), but the two genera can be distinguished by the shape of the pronotum, with median anterior margin gently rounded or slightly medianly emarginate in Pygoluciola (Ballantyne and Lambkin 2006) versus lateral margins of pronotum almost parallel in Emeia.

Description

(based on adult male). Body length 6.5–10.5 mm. Body width 2.7–4.0 mm. Integument black or dark brown, with a narrow (e.g., in E. pulchra, see Fig. 3A) or thick (e.g., in E. pseudosauteri, see Fig. 8A) black stripe on pronotum.

Head. Hypognathous; head depressed between eyes, eyes exposed in front of pronotum; antennae filiform, with 11 antennomeres (Figs 3B, 8B).

Thorax. Pronotum in dorsal view appearing pink-red or orange-red, with a black median stripe, lateral margins almost parallel (Figs 3A, 8A); surface of elytra smooth, longitudinal carina absent (Figs 3A, 8A); legs long and straight, no femora or tibiae swollen or curved (Figs 3B, 8B).

Abdomen. V2–V5 dark brown or black. Light organs present in V6 and V7, entirely occupying V6; V7 semitransparent (Figs 3B, 8B).

Male genitalia. Trilobate, parameres extending ~0.14 mm (n = 3) beyond phallus; both parameres equal in length (Figs 6A, 12A).

Emeia pulchra Zhu & Zhen, sp. nov.

Figs 3–4, 5, 6

Diagnosis

(based on adult male). The new species can be differentiated from E. pseudosauteri Fu, Ballantyne & Lambkinby the elytron, hindwing venation and aedeagus. In fresh specimens, the elytral apices are black in E. pulchra (Fig. 3), but with a narrow orange stripe in E. pseudosauteri (Fig. 8). In the male hindwing, the upper vein of the MP3+4 venation in E. pulchra reaches the margin of the hind wings without forks (n=2) (Fig. 4). In E. pseudosauteri, the upper vein of MP3+4 forks and reaches the margin of the hind wings (n=2) (Fig. 10). The aedeagus in E. pulchra is approx. 3 times as long as wide (length 1.77 mm: width 0.58 mm) (Fig. 6A), versus approx. 2 times as long as wide (length 1.66 mm: width 0.84 mm) in E. pseudosauteri (Fig. 12A).

Description

Male: BL 10.0–10.4 mm; BW 3.5–3.7 mm (three individuals).

Head. Antennae filiform, black, almost 2/3 as long as body length; antennomere 1 cone-shaped; 2 short and cylindrical; 3 to 10 compressed, not bifurcate; 11th antennomere almost 1.5 times longer than 10th, slightly dilated from base to apex. Concave between eyes dorsally in cross section, both eyes occupying about 2/3 width of whole head in ventral view. Eyes spherical, so that head cannot fully contract into pronotum. Mouthparts fully developed, clypeolabral suture flexible, outer edges of labrum reaching inner edges of closed mandibles.

Thorax. Scutellum black and slightly emarginate distally. Elytra elongated, dark brown to black, apices not deflexed in dorsal view, sides slightly convex. Hind wing well developed, r3 half the length of r4 (Fig. 4). Legs long and straight, without swelling on any part, dark brown to black, with dense white hairs.

Abdomen. Dark brown, ventrites gradually diminishing in length posterad. Light organs yellow-white, occupying almost all of V6 and half of V7, not reaching to posterior edges of V7. V6 and V7 rounded laterally (Fig. 5), posterior half of V7 not arched in dorsal view, abruptly narrowed to truncate posterior apex, apex emarginate (Fig. 5C). T7 rounded, without anterolateral corners (Fig. 5A); T8 symmetrical with concealed anterolateral arms, widest across middle with lateral margins subparallel-sided in anterior half, tapering evenly in posterior half to a rounded and partly truncate posterior margin (Fig. 5B). Abdominal spiracles on lateral edges of each abdominal segments. EL/EW = 4.7–4.8; EL/PL= 4.7–5.0 (n=3).

Male genitalia (Fig. 6): Aedeagal sheath (T9, T10, S9) (Fig. 6D, E) 3.15 mm long; anterior half of sternite broad, apically rounded; tergite without protrusion along posterior margin of T9. Aedeagus (Fig. 6A–C) 1.61 mm long. Phallus short (~1.2 mm) and thick, broadest at midlength, becoming thinner at apex and base, parameres (lateral lobes) extending about 0.14 mm beyond phallus. Parameres robust, subparallel-sided, symmetrical, with blunt preapical lateral expansion.

Figures 3–4. 

Emeia pulchra Zhu & Zhen sp. nov., male 3 habitus of holotype A dorsal view B ventral view 4 right wing, dorsal view. Scale bars: 5 mm (3); 2 mm (4).

Figure 5. 

Male abdominal ventrites (V) and tergites (T) of Emeia pulchra Zhu & Zhen, sp. nov. A T7 B T8 C V7. Scale bar: 0.5 mm.

Figure 6. 

Aedeagusof Emeia pulchra Zhu & Zhen sp. nov. A dorsal view B ventral view C lateral view. Aedeagal sheath of E. pulchra D dorsal view E ventral view. Scale bar: 1 mm.

Figure 7. 

Habitat of Emeia pulchra Zhu & Zhen sp. nov. in Jiulong National Wetland Park.

Etymology

The specific name pulchra refers to the bright pronotum coloration.

Holotype

China • 1♂; Zhejiang, Lishui; 28°37.56'N, 119°49.7'E; H: 60 m, 2. IV. 2020; Chengqi Zhu leg.; ‘HOLOTYPE (red), ♂, Emeia pulchra sp. nov., det. Zhu, Zhen, 2021’ (Westlake University).

Paratype

China • 1♂; Zhejiang, Lishui; 28°37.56'N, 119°49.7'E; H: 60 m, 2. IV. 2020; Chengqi Zhu leg.; ‘PARATYPE (yellow), ♂, Emeia pulchra sp. nov., det. Zhu, Zhen, 2021’ (Westlake University).

Distribution

China: Zhejiang Province.

Habitat and occurrence

The males were found in an open forest of mainly Chinese wingnut, of the family Juglandaceae [Pterocarya stenoptera C. DC.] (Fig. 7). The floor of the Emeia pulchra habitat was covered with a lush herbaceous layer 20–30 cm high.

There are many terrestrial snails and slugs in this habitat, which may be potential food for Emeia pulchra larvae. Combining descriptions from local people and our field observations, adult fireflies are usually observed mid-March. The protection of fireflies has been supported by the Lishui government and Jiulong National Wetland Park management departments, and this area has been protected as Jiulong National Wetland Park (Fig. 7). Fan (2019) reported that the population size of E. pulchra has increased from 2014 to 2019 with the protection efforts.

Behavioral remarks

There are two obvious luminous bands at the terminal end of the adult male abdomen. The two bands both emit intermittent bright light during courtship. The male courtship behavior usually starts at 19:00 (approximately 1h after sunset), and peaks at about 20:30. Adult males rest on higher herbs and emit yellow and green flashing light. Males are reluctant flyers; the distance of each flight ranges from 0.5 to 5 m.

Figures 8–11. 

Emeia pseudosauteri Fu, Ballantyne & Lambkin, 2012. Male and female 8 habitus of male A dorsal view. Arrow highlights narrow orange stripe on elytral apices. The color appears darker in this photo, but it is orange and easily seen in both dried and fresh samples B ventral view 9 habitus of female. A dorsal view B ventral view 10 right wing of male. Dorsal view. Arrow points to wing venation, which differs between the two Emeia species 11 right wing of female. Dorsal view. Scale bars: 5 mm (8, 9); 2 mm (10); 0.5 mm (11).

Emeia pseudosauteri (Geisthardt 2004)

Figs 8–11, 12

Emeia pseudosauteri (Geisthardt 2004). Zootaxa (3403), 1–53. TL: ‘Mt. Tian Tai, Sichuan Province, China’.

Specimens examined

China: 6♂♂,1♀, Sichuan, Mt. Tian Tai, 3.IV. 2021, Chengquan Cao leg. We herein examined specimens of E. pseudosauteri from Mt. Tian Tai (the type locality), and their identity was further verified using cox1 barcode sequences (Fig. 2) and morphological examination (Figs 812).

Figure 12. 

Aedeagus of Emeia pseudosauteri. A dorsal view B ventral view C lateral view. Male aedeagal sheath of E. pseudosauteri D dorsal view E ventral view. Scale bars: 1 mm.

Figure 13. 

Distribution map of the genus Emeia in China. The black star indicates E. pulchra Zhu & Chen sp. nov., the black dot E. pseudosauteri (map of China from: http://bzdt.ch.mnr.gov.cn/).

Key to species (adult males)

1 The elytral apices have a narrow orange stripe in both fresh and dried specimens; upper vein of MP3+4 forked and reaching edge of hind wing (Fig. 10); phallus and parameres broad, 2 times as long as wide (Fig. 12A) E. pseudosauteri Fu, Ballantyne & Lambkin
The elytral apices are black in fresh and preserved specimens (Fig. 3A); upper vein of MP3+4 reaching margin of hind wings, but without forks (Fig. 4); phallus and parameres slender, 3 times as long as wide (Fig. 6A) E. pulchra Zhu & Zhen, sp. nov.

Discussion

In this study, we summarized the diagnostic features of the genus Emeia. Emeia pulchra Zhu & Zhen, sp. nov. is morphologically similar to E. pseudosauteri Fu, Ballantyne & Lambkin, 2012 from Sichuan Province. However, we found differences in the antennal length and body size between the two species. The body size of a species may vary due to nutrition and environmental factors, so we did not include size in the diagnosis to the new species. The antenna of male E. pulchra (Fig. 3) is narrower than that of E. pseudosauteri (Fig. 8) in lateral view. Females of E. pseudosauteri have body length about 2/3 of that of the male and have normal elytra (Fig. 9), but their hind wings are small and shrunken, about 1/4 length of the male hind wings (Figs 10, 11). In the male, we found that the hind wing of E. pseudosauteri was relatively narrower and longer than that of E. pulchra. The elytral apice has a narrow orange stripe in both fresh and dried specimens of E. pseudosauteri, whereas it is black in E. pulchra (in three E. pulchra and six E. pseudosauteri examined). The observed body size of E. pseudosauteri (BL 6.6–7.2 mm; BW 2.7–2.9 mm; six individuals measured) was smaller than for E. pulchra (BL 10.0–10.4 mm; BW 3.5–3.7 mm; three individuals measured). In the male genitalia, the aedeagus of E. pulchra (Fig. 6A) is narrower than that of E. pseudosauteri (Fig. 12A), and the parameres are less curved (Figs 6B, 12B). In addition, the new species is only known from S. Zhejiang, whereas E. pseudosauteri is only found 1600 km westward, in the Sichuan Province (Fig. 13).

The “barcode region” of cox1 is often used as an aid to new species’ identification and distinction from close relatives in the Barcode of Life Data system (Ratnasingham and Hebert 2007; Lin et al. 2009). Currently, this method has been widely and successfully used to identify closely-related species and conspecific individuals. Our cox1 gene tree recovered the major subdivisions within Lampyridae, including Lampyrinae, Photurinae and Luciolinae. This tree is consistent with recent studies using 436 loci (Martin et al. 2019) or 15 mitochondrial genes (Chen et al. 2019), and supports that the placement of Emeia in Luciolinae (Fig. 2). Both the cox1 tree and morphology support E. pulchra as the closest sister species of E. pseudosauteri.

Acknowledgements

We are obliged to Ms. Dan-Dan Tu for assistance with DNA amplification and Mr. Zhuo-Heng Jiang for helpful comments on our manuscript. We thank Dr. Cheng-Quan Cao and Dr. Fang-Zhou Ma for specimen collection and sampling information. This work was supported by the National Natural Science Foundation of China [grant number 31900315 to Y.Z.], the Zhejiang Provincial Natural Science Foundation of China [grant numbers LR21C030001 to Y.Z.] and the Westlake Education Foundation.

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