2urn:lsid:arphahub.com:pub:45048D35-BB1D-5CE8-9668-537E44BD4C7Eurn:lsid:zoobank.org:pub:91BD42D4-90F1-4B45-9350-EEF175B1727AZooKeysZK1313-29891313-2970Pensoft Publishers10.3897/zookeys.645.1068510685Research ArticleAnimaliaArachnidaAraneaeArthropodaChelicerataInvertebrataLinyphiidaeMolecular systematicsSystematicsTaxonomyCenozoicNeogeneAsiaCentral AsiaChinaOn a desmitracheate “micronetine” Nippononetaalpina (Li & Zhu, 1993), comb. n. (Araneae, Linyphiidae)BaoMengdie1*BaiZishang2*TuLihong1tulh@cnu.edu.cnCollege of Life Sciences, Capital Normal University, Xisanhuanbeilu Str. 105, Haidian Dist. Beijing, 100048, P. R. ChinaCapital Normal UniversityBeijingChinaThe High School Affiliated to Renmin University of China, Beijing, 100080The High School Affiliated to Renmin University of ChinaBeijingChina
Corresponding author: Lihong Tu (tulh@cnu.edu.cn)
Academic editor: D. Dimitrov
These authors contributed equally to this work
201713012017645133146FFD17205-7713-FFBE-B135-6A18C74CB5122775FAB2-83CD-4909-A399-6F87307BE4422422283009201608122016Mengdie Bao, Zishang Bai, Lihong TuThis 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.http://zoobank.org/2775FAB2-83CD-4909-A399-6F87307BE442
The phylogenetic analyses based on molecular data demonstrate that all “micronetine” species of a desmitracheate system form a monophyly. Macrargus Dahl, 1886 is a “micronetine” genus, the species of which have a haplotracheate system in general, while Macrargusalpinus Li & Zhu, 1993 was found to have a desmitracheate system; this makes its generic placement problematic. According to the results of phylogenetic analysis, we transfer M.alpinus to another genus as Nippononetaalpina (Li & Zhu, 1993), comb. n., and provide a redescription of its genital characters and somatic features. Comparisons with other “micronetine” species with a desmitracheate system are provided. Putative synapomorphies for Nippononeta, the clade Nippononeta + Agyneta, and for the “desmitracheate micronetines” clade, as well as their relationship with Helophora, are provided and discussed.
Bao M, Bai Z, Tu L (2017) On a desmitracheate “micronetine” Nippononeta alpina (Li & Zhu, 1993), comb. n. (Araneae, Linyphiidae). ZooKeys 645: 133–146. https://doi.org/10.3897/zookeys.645.10685
Introduction
Linyphiidae Blackwall, 1859 is a species-rich family of spiders which has species-specific genitalia but more conservative somatic features in general. The tracheate system in linyphiids consists of two pairs of trachea; “desmitracheate” and “haplotracheate” are the two terms referring to the two main tracheal conditions having the median pair highly branched and unbranched, respectively (Blest 1976, Millidge 1984). The seven subfamilies currently accepted in Linyphiidae are delimited largely based on genital characters, except for Erigoninae Emerton, 1882, which was originally defined by having a simple type male palp (Merrett 1963, Millidge 1977), and then redefined on the basis of its desmitracheate system (Blest 1976, Millidge 1984). Such a classification for “erigonines” has long been puzzled by the observations that some “erigonine” species have genitalia of simple type, but possess haplotracheate systems (Hormiga 2000, Miller and Hormiga 2004), while some “micronetine” species have genitalia of complex type, but possess desmitracheate systems (Millidge 1984, Dupérré 2013, Yan et al. 2015). Results of phylogenetic analyses based on molecular data recovered the monophyly of the Linyphiidae, in which the taxa of “micronetines” and “erigonines” nest (Arnedo et al. 2009, Wang et al. 2015); however, all “micronetine” species with a desmitracheate system form a monophyly (addressed as “desmitracheate micronetines” clade hereafter). Ancestral state reconstructions indicate that both tracheal features and genital characters used in subfamily classification are homoplastic. Furthermore, conversions between haplotracheate and desmitracheate conditions have taken place multiple times, and usually at the generic level. Until now, no evidence indicated that both tracheal conditions co-occur among congeneric species.
Macrargus Dahl, 1886 is a typical “micronetine” genus with a haplotracheate system (Blest 1976). However, Macrargusalpinus Li & Zhu, 1993, occurring in China, was found to have a desmitracheate system, different from its congeners. The “desmitracheate micronetines” clade resulting from phylogenetic analyses is distantly related to Macrargus (Wang et al. 2015). Some putative synapomorphies for the desmitracheate “micronetine” genus Nippononeta Eskov, 1992 and for the clade Nippononeta+Agyneta proposed by Yan et al. (2015) can also be found in M.alpinus, yet none of them is present in other Macrargus species. This implies that the generic placement of M.alpinus is questionable.
To test the phylogenetic placement of Macrargusalpinus and its relationships with other desmitracheate “micronetines”, we added the newly sequenced DNA sequence data of M.alpinus into the dataset of Wang et al. (2015). In the present study, we propose a new generic placement for M.alpinus based on the result of phylogenetic analysis of the new dataset. We present a redescription of M.alpinus and comparisons with closely related groups. Putative synapomorphies for Nippononeta and the desmitracheate “micronetine” groups proposed by Yan et al. (2015) are revised for further studies.
Materials and methodsPhylogenetic analysis
Two mitochondrial genes, cytochrome c oxidase subunit I (CO1) and 16S rRNA (16S), and two nuclear genes, 18S rRNA (18S), and 28S rRNA (28S) were amplified and sequenced for Macrargusalpinus and added to the dataset of Wang et al. (2015) to test its placement in Linyphiidae. Given that the primary analysis resulted in Macrargusalpinus as a sister group to Nippononetacoreana, the four genes data of one additional Nippononeta species was downloaded from GenBank and added to test the monophyly of the genus Nippononeta and its relationship with M.alpinus. Based on the dataset of Wang et al. (2015), a total of 132 taxa was included in our matrix: 130 linyphiid species including the type species of Macrargus, seven species from four genera as representatives of desmitracheate “micronetines”, and two representative species of Nippononeta. Most outgroup taxa of Wang et al. (2015) were removed; only two representatives of Pimoidae, the sister group of Linyphiidae, were included as outgroups to root the tree.
Molecular protocols for amplification and sequencing follow that of Wang et al. (2015). Taxa sampled and sequence accession numbers are presented in Wang et al. (2015), and those of the two new taxa are presented in Suppl. material 1. Every sequence was first aligned using CLUSTAL X version 1.81 (Thompson et al. 1997) independently, and then the sequences of four genes were concatenated by MESQUITE (Version 2.75, Maddison and Maddison 2009). The genes were unpartitioned. The gaps were considered as missing data. Maximum Likelihood analysis of the concatenated dataset was conducted by RAxML v. 7.2.7 as implemented on the Cipres Gateway (Miller et al. 2010), using GTR+I+R model, which was the best fitting model for the matrix by JModeltest examination. Bootstrap analysis was obtained with 1000 replicates to assess nodal support.
Morphological methods
Specimens were examined and illustrated by using a Leica M205A stereomicroscope and a Leica DM5500B compound microscope. The male palp and female epigynum were examined after they were dissected from the body. The embolic division was excised by breaking the membranous column connecting between the suprategulum and radix. For microscopic examination and illustration, the male palp and epigynum were cleared in methyl salicylate. Illustrations were made using a drawing tube.
Scanning Electron Microscopy
(SEM) images were taken by using a LEO 1430VP at the Department of Biological Sciences at George Washington University. For SEM examination the specimens were prepared following Álvarez-Padilla and Hormiga (2008). SEM images of the embolic division taken from the right palp were mirrored to match those taken from the left palp. All specimens examined here are deposited in the
Institute of Zoology, Chinese Academy of Sciences, Beijing, China
(IZCAS), and the
College of Life Sciences, Capital Normal University, China
(CNU). Terminology for the genital and somatic characters follows Hormiga (2000), Tu and Hormiga (2010, 2011), Saaristo and Tanasevitch (1996) and Wang et al. (2015).
Results
With the data on Macrargusalpinus and an additional Nippononeta species added to their dataset, the Maximum Likelihood analysis recovered the general topology of Wang et al. (2015): the monophyly of Linyphiidae, its sister relationship with Pimoidae, the seven main clades and relationships among them within linyphiids (all with bootstrap > 95%), with variations on the placement of some weakly supported lineages within these clades (Fig. 1). “Micronetines” remain paraphyletic, forming clades A and F, as well as some basal lineages of clade B, nesting with “erigonines”. Three desmitracheate clades are included within clade B. Besides the “distal erigonines” clade (bootstrap = 69%) and one other “desmitracheate erigonines” lineage (bootstrap = 100%), all those “micronetine” species of a desmitracheate system form a well-supported clade, the “desmitracheate micronetines” clade (bootstrap = 100%), sister to the Helophora clade (bootstrap = 91%). Macrargusrufus and Micronetaviaria form one of the “haplotracheate micronetines” lineages within clade B (bootstrap = 69%). Meanwhile, Macrargusalpinus falls into the Nippononeta clade (bootstrap = 63%), sister to N.kantonis (bootstrap = 99%), but distantly related to Macrargusrufus. The monophyly of Agyneta and its relationship with the Nippononeta clade remain unresolved.
Linyphiid phylogeny resulting from the Maximum Likelihood analysis based on DNA sequence data. Numbers at nodes indicate bootstrap support above 50%. Branches in color represent seven robustly supported main clades within Linyphiidae. Branches in bold indicate the desmitracheate type. Taxa in blue are currently placed in Micronetinae.
AnimaliaAraneaeLinyphiidaeC7D9CBE8-AF8A-5FD6-A144-6D614F5E47E5Nippononetaalpina(Li & Zhu, 1993)comb. n.MacrargusalpinusLi & Zhu, in Song et al. 1993: 863, f. 21A–I (D♂♀); Li et al. 1994: 81, f. 31–33 (♀); Li and Zhu 1995: 41, f. 2a–i (♂♀); Song et al. 1999: 186, f. 104D, G, J (♂♀).Type material examined.
♂ holotype (IZCAS), China, Hubei Province, Shennongjia Natrual Conservation, Panlong County, 26 June 1986; 1♂ and 2♀ paratypes (IZCAS), same data as the holotype.
Additional material examined.
4♂ and 4♀(CNU), China, Sichuan Province, Lushan County, Fenghuo town, Sanyou village, 7 July 2004, L. Tu leg; 5♂ and 4♀(CNU), China, Sichuan Province, Tianquan County, Mt. Erlangshan Natural Forest Park, 8 July 2004, L. Tu leg; 3♂ and 4♀(CNU), China, Zhejiang Province, Mt. Yandangshan, 28°35.78’ N, 121°04.30’ E, alt. ca 420m, 15 Aug. 2010, F. Wang leg.
Diagnosis.
The male of Nippononetaalpina comb. n. can be distinguished from all other Nippononeta species by the proximal tibial process (Fig. 2A) and the paracymbial median branch (Fig. 3D), both absent in other Nippononeta species. The female epigynum is distinguished by the epigynal cavity fully filled by the sigmoid folded scape, with a pair of lateral wings on the scape proximal part wrapping downward (Fig. 4A) and another pair of lateral wings on the scape distal part wrapping upward (Fig. 4B), while in most other Nippononeta species the epigynum usually diamond-shaped, with a dorsally opened epigynal cavity and a ventrally exposed scape (Yan et al. 2015: fig. 2A–B).
Nippononetaalpina comb. n. (A–F) male palp A retrolateral B ventral C prolateral D embolic division E embolus F distal suprategular apophysis (G–K) epigynum G ventral H lateral I dorsal J dorsal, cleared K lateral, cleared. Abbreviations: AX
Nippononetaalpina comb. n., male palp. A retrolateral B prolateral C prolateral with embolic division removed D detail of A, arrows indicate serrated surface of DTA (upper right), median branch of paracymbium (upper left) and outer margin fold (lower) (E–H) embolic division E dorsal F ventral, arrow indicates embolic spine G anterior H detail of F, shows hided EP. Abbreviations: ARP
Nippononetaalpina comb. n. (A–E) epigynum A ventral B dorsal C lateral D ventral, cleared with ventral plate removed E lateral, cleared with ventral plate removed F male abdomen, ventral, shows epiandrous gland spigots absent G tracheal system, cleared H female palp, shows distal claw absent. Abbreviations: CG
copulatory groove
; DLW
lateral wing on distal part of scape
; DPS
distal part of scape
; FG
fertilization groove
; IL
inner lobe
; PLW
lateral wing on proximal part of scape
; S1
upper chamber of spermatheca
; S2
lower chamber of spermatheca
; SC
scape
; SG
special gland
; ST
stretcher
; TDF
transversal dorsal fold
; VP
ventral plate
.
https://binary.pensoft.net/fig/118091Description.
Chelicerae of normal size, with narrower fang base and denser stridulatory ridges in the male than those in the female (Fig. 5C–D). Female palp without distal claw (Fig. 4H). Tracheal system having median trunk wider than the lateral pair, highly branched and extending into prosoma (Fig. 4G), tracheoles with taenidia. Epiandrous gland spigots absent in the male (Fig. 4F). Spinnerets (Fig. 4E–H): PLS in females having the mesal cylindrical gland spigot base enlarged (Fig. 5F), the triplet formed by one flagelliform and two aggregate gland spigots presented in the male PLS (Fig. 5H). For other somatic features, see description for the genus by Eskov (1992).
Nippononetaalpina comb. n. A male prosoma, lateral B female prosoma, lateral C male chelicerae, ectal D female chelicerae, ectal E female ALSF female PLSG female PMSH male PLS. Abbreviations: AC
aciniform gland spigots
; AG
aggregate gland spigots
; ALS
anterior lateral spinneret
; CY
cylindrical gland spigot
; FL
flagelliform gland spigot
; MAP
major ampullate gland spigot
; mAP
minor ampullate gland spigot
; PI
piriform gland spigot
; PLS
posterior lateral spinneret
; PMS
posterior median spinneret
.
https://binary.pensoft.net/fig/118092
Male palp (Figs 2A–F, 3). Tibia short, as long as wide, with three apophyses: one distal, one retrolateral, one proximal; distal tibia apophysis with serrated surface. Cymbium with small retrolateral lobe and proximal fold above paracymbial base. Paracymbium U-shaped, distal arm shorter than proximal one, with well-developed median branch and outer margin fold. Distal suprategular apophysis modified as pit hook with hook sclerite. Embolic membrane furnished with many papillae. Embolic division: boat-shaped radix with ear-like anterior process. Embolus extremely complex, modified with multiple free ends; embolus proper covered by one of embolic sclerites; embolus thumb modified as spine-like projections; and apex triangular; Fickert’s gland located within embolus. Lamella characteristica unbranched, sigmoid ribbon-like in ventral view, with thread-like projections distally. Terminal apophysis divided into two parts: the posterior strongly sclerotized with a rounded end, the anterior membranous part with thread-like projections distally.
Epigynum (Figs 2G–K, 4A–E). Epigynal plate protruding out, with wide epigynal basal part. Median plate absent on dorsal surface, but the tegument of epigynal basal part forming transverse dorsal fold. Epigynal cavity fully filled by sigmoid folded scape, covered by a pair of lateral wings on scape proximal part wrapping downward, and another pair of lateral wings on scape distal part wrapping upward; stretcher lifting up. Copulatory tracts in groove state; fertilization tracts changing from groove to duct state and extending towards epigastric furrow.
Remarks.
Nippononetaalpina comb. n. originally was placed in the genus Macrargus Dahl, 1886, whose type species M.rufus Wider, 1834 has a typical haplotracheate system (Blest 1976). In addition to tracheal characters, the genitalia of N.alpina are of a different type from that of M.rufus (see descriptions by Saaristo in Marusik and Koponen 2008, Millidge 1977, 1984, Gnelitsa and Koponen 2010). Some genital characters of N.alpina are consistent with the putative synapomorphies for the genus Nippononeta and for the “desmitracheate micronetines” clade discussed bellow, but not shared by M.rufus.
In addition, Micrargus is masculine in gender, while Nippononeta is feminine. As M.alpinus is being transferred to Nippononeta, the species name has to be changed to alpina. However, Ono and Saito (2001) already described a species also named as N.alpina Ono & Saito, 2001, which is not a junior synonym of M.alpinus. Therefore we propose a replacement name as onoi, after one author’s name, for the species of Ono and Saito to avoid homonymy.
Discussion
Our results show that all desmitracheate “micronetines” form a monophyly, and Macrargusalpinus falls into the Nippononeta clade, distantly related to Macrargusrufus (Fig. 1). These suggest a new generic placement for this species, Nippononetaalpina comb. n. The two “micronetine” species, N.alpina and M.rufus grouped into clade B is consistent with the putative synapomorphies based on somatic characters proposed for the seven-clade division (Wang et al. 2015). It is also in accord with the tracheal characters to group N.alpina with other desmitracheate “micronetines”, rather than with the haplotracheate genus Macrargus.
According to Wang et al. (2015) and Yan et al. (2015), some putative synapomorphies based on genital characters support the relationships among the desmitracheate “micronetines” and other linyphiids. The presence of a median plate is a synapomorphy for all linyphiids, but is secondarily lost in Helophora, Nippononeta, Agyneta and Mesasigone, as well as in N.alpina (Fig. 4B). Therefore, the absence of a median plate as a putative synapomorphy supports the sister relationship between the “desmitracheate micronetines” clade and Helophora (Fig. 1). The highly branched median pair of the tracheae, the protruding epigynum modified into a scape and epigynal cavity (Fig. 4A–D), and male palp with complex embolus (Fig. 1E) are putative synapomorphies for the former (Fig. 4G), while the moderately branched (Arnedo et al. 2009), the protruding epigynal plate without forming a scape and epigynal cavity (Tu and Hormiga 2010: fig. 7), and by the flagelliform embolus of the male palp (Chamberlin and Ivie 1933: fig. 85, Tao et al. 1995: fig. 69) are putative synapomorphies for the latter. Furthermore, the monophyly of the clade including Nippononeta and Agyneta (unknown for Mesasigone) is supported by four putative synapomorphies: by the presence of a serrated distal tibial apophysis and a retrolateral tibial process on the male palp (Fig. 3D, see also Yan et al. 2015: fig. 1D); by the dorsally opened epigynal cavity resulting from a secondary loss of the median plate (Fig. 4B, see also Yan et al. 2015: fig. 2B); and by the fertilization tracts changing from groove to duct state (Fig. 4E, see also Tu and Hormiga 2010: fig. 6c, Yan et al. 2015: fig. 5D).
The monophyly of the Nippononeta clade is supported by the following four putative synapomorphies: the pointed apophysis on the paracymbial proximal arm (Fig. 3D, Yan et al. 2015: fig. 1D); the embolus thumb modified into spine-like projections on the male palp (Fig. 3H, Yan et al. 2015: fig. 1G); and the presence of a transverse dorsal fold and finger-like stretcher (Fig. 1K, Yan et al. 2015: fig. 2A). Furthermore, the new placement of Nippononetaalpina implies that several putative synapomorphies previously proposed for Nippononeta by Yan et al. (2015) have to be reviewed: the narrowed epigynal basal part and the expanded lateral epigynal shoulder (Yan et al. 2015: fig. 2A–D) are not present in N.alpina. Meanwhile, N.alpina also has some apomorphies not shared with other Nippononeta species: the two pairs of scape lateral wings and the uplifting stretcher (Fig. 4A–D).
The monophyly of Agyneta is not supported and its relationships with other desmitracheate “micronetines” remain unresolved. Nevertheless, morphological studies show that Agyneta species are easily distinguished by some genital characters: e.g. the presence of a conical cymbial elevation and a sickle-shaped embolus with a large thumb, and the scaped epigynum with a pair of well-developed lateral lobes (see the review of Dupérré 2013). The uncertain phylogenetic relationship between Agyneta and other desmitracheate “micronetines” is largely due to a limited species-level sampling for such a diverse group. Clearly, more comprehensive sampling is needed for future studies.
Acknowledgements
We would like to thank Yuri Marusik, Mike Rix and Dimitar Dimitrov for their comments on an earlier version of this paper. We also thank Lara Lopardo, Dimitar Dimitrov, Fernando Álvarez-Padilla and Gustavo Hormiga for their help on collection for SEM images. This research is supported by National Sciences Foundation, China (NSFC-31572244).
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GenBank accession numbers
molecular data
https://binary.pensoft.net/file/118093This dataset is made available under the Open Database License (http://opendatacommons.org/licenses/odbl/1.0/). The Open Database License (ODbL) is a license agreement intended to allow users to freely share, modify, and use this Dataset while maintaining this same freedom for others, provided that the original source and author(s) are credited.Mengdie Bao, Zishang Bai, Lihong Tu