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Acanoides gen. n., a new spider genus from China with a note on the taxonomic status of Acanthoneta Eskov & Marusik, 1992 (Araneae, Linyphiidae, Micronetinae).

Sun N, Marusik YM, Tu L - Zookeys (2014)

Bottom Line: To distinguish from other genera with similar genitalic characters, we compare the new genus with the species of Acanthoneta Eskov & Marusik, 1992, Epibellowia Tanasevitch, 1996 and Wubanoides Eskov, 1986.Furthermore, redescriptions of the epigynal morphology of Acanthoneta aggressa Chamberlin & Ivie, 1943 (Nearctic) and on the male of A. dokutchaevi Eskov & Marusik, 1993 (Far East Asia, firstly recorded from China) are provided.Based on comparison with Poeciloneta, from which Acanthoneta stat. n. was separated by Saaristo and Tanasevitch (1996), a revised diagnosis is proposed to support the generic status.

View Article: PubMed Central - HTML - PubMed

Affiliation: College of Life Sciences, Capital Normal University, Xisanhuanbeilu Str. 105, Haidian Dist., Beijing, 100048, P. R. China.

ABSTRACT
A new "micronetine" genus Acanoides gen. n. is erected to accommodate two species from China: Acanoides beijingensis sp. n. as the type species and Acanoides hengshanensis (Chen & Yin, 2000), comb. n., with the females described for the first time. The genitalic characters and somatic features of the new genus were studied by means of light microscopy and scanning electron microscopy (SEM). The monophyly of the new genus was tested by a phylogenetic analysis based on molecular data. Descriptions of the new genus, the new species and the new combination are presented; SEM images and microscopy pictures of somatic and genitalic characters are provided in detail. To distinguish from other genera with similar genitalic characters, we compare the new genus with the species of Acanthoneta Eskov & Marusik, 1992, Epibellowia Tanasevitch, 1996 and Wubanoides Eskov, 1986. Four putative synapomorphies for Acanoides gen. n. are suggested to support its monophyly that could be tested in the future. Furthermore, redescriptions of the epigynal morphology of Acanthoneta aggressa Chamberlin & Ivie, 1943 (Nearctic) and on the male of A. dokutchaevi Eskov & Marusik, 1993 (Far East Asia, firstly recorded from China) are provided. Based on comparison with Poeciloneta, from which Acanthoneta stat. n. was separated by Saaristo and Tanasevitch (1996), a revised diagnosis is proposed to support the generic status.

No MeSH data available.


Acanoides beijingensis sp. n. A male palp, prolateral B male palp, prolateral, with embolic division removed C male palp, retrolateral D embolic division, ventral E embolic division, dorsal F epigynum, ventral G epigynum, dorsal H epigynum, lateral. CG copulatory groove; CO copulatory opening; DP dorsal plate; EA extensible area of epigynal basal part; EM embolic membrane; EP embolus proper; FG fertilization groove; FiG Fickert’s gland; LC lamella characteristica; MP median plate; P paracymbium; PCA proximal cymbial apophysis; R radix; S spermathecae; TA terminal apophysis; TH thumb of embolus; VP ventral plate. [Scale bars: mm].
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Figure 2: Acanoides beijingensis sp. n. A male palp, prolateral B male palp, prolateral, with embolic division removed C male palp, retrolateral D embolic division, ventral E embolic division, dorsal F epigynum, ventral G epigynum, dorsal H epigynum, lateral. CG copulatory groove; CO copulatory opening; DP dorsal plate; EA extensible area of epigynal basal part; EM embolic membrane; EP embolus proper; FG fertilization groove; FiG Fickert’s gland; LC lamella characteristica; MP median plate; P paracymbium; PCA proximal cymbial apophysis; R radix; S spermathecae; TA terminal apophysis; TH thumb of embolus; VP ventral plate. [Scale bars: mm].

Mentions: The result of the phylogenetic analysis based on molecular data suggests that the new species from Beijing is the sister taxon of Poeciloneta hengshanensis which had ever been transferred to Acanthoneta by Tu et al. (2006). The lineage comprised by the two species is distantly related to Acanthoneta sp. (Appendix - Fig. S1). Accordingly, we erected here Acanoides gen. n. to accommodate the two species: Acanoides beijingensis sp. n. and Acanoides hengshanensis comb. n. The three known Acanthoneta species have very distinct male palpal morphology, only differ from that of the type species in small details (Eskov and Marusik 1992, 1993). Regardless the Acanthoneta taxon is congeneric with, or is the type species Acanthoneta aggresus, the new genus differs from all the three known species of Acanthoneta as well as all other “micronetines” in the females having a movable epigynum (Figs 4G, 5G) and the males having a longer and sharper embolus proper (Figs 2D, 3D) which generally is pointed in “micronetines” (Fig. 6F); Fickert’s gland located in the membranous area outside the radix (Figs 2D, 3D), rather than embedded within the radix as usually the case in “micronetines” (Fig. 6G). This suggests that the two species are not congeneric with Acanthoneta.


Acanoides gen. n., a new spider genus from China with a note on the taxonomic status of Acanthoneta Eskov & Marusik, 1992 (Araneae, Linyphiidae, Micronetinae).

Sun N, Marusik YM, Tu L - Zookeys (2014)

Acanoides beijingensis sp. n. A male palp, prolateral B male palp, prolateral, with embolic division removed C male palp, retrolateral D embolic division, ventral E embolic division, dorsal F epigynum, ventral G epigynum, dorsal H epigynum, lateral. CG copulatory groove; CO copulatory opening; DP dorsal plate; EA extensible area of epigynal basal part; EM embolic membrane; EP embolus proper; FG fertilization groove; FiG Fickert’s gland; LC lamella characteristica; MP median plate; P paracymbium; PCA proximal cymbial apophysis; R radix; S spermathecae; TA terminal apophysis; TH thumb of embolus; VP ventral plate. [Scale bars: mm].
© Copyright Policy - creative-commons-attribution
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC3921563&req=5

Figure 2: Acanoides beijingensis sp. n. A male palp, prolateral B male palp, prolateral, with embolic division removed C male palp, retrolateral D embolic division, ventral E embolic division, dorsal F epigynum, ventral G epigynum, dorsal H epigynum, lateral. CG copulatory groove; CO copulatory opening; DP dorsal plate; EA extensible area of epigynal basal part; EM embolic membrane; EP embolus proper; FG fertilization groove; FiG Fickert’s gland; LC lamella characteristica; MP median plate; P paracymbium; PCA proximal cymbial apophysis; R radix; S spermathecae; TA terminal apophysis; TH thumb of embolus; VP ventral plate. [Scale bars: mm].
Mentions: The result of the phylogenetic analysis based on molecular data suggests that the new species from Beijing is the sister taxon of Poeciloneta hengshanensis which had ever been transferred to Acanthoneta by Tu et al. (2006). The lineage comprised by the two species is distantly related to Acanthoneta sp. (Appendix - Fig. S1). Accordingly, we erected here Acanoides gen. n. to accommodate the two species: Acanoides beijingensis sp. n. and Acanoides hengshanensis comb. n. The three known Acanthoneta species have very distinct male palpal morphology, only differ from that of the type species in small details (Eskov and Marusik 1992, 1993). Regardless the Acanthoneta taxon is congeneric with, or is the type species Acanthoneta aggresus, the new genus differs from all the three known species of Acanthoneta as well as all other “micronetines” in the females having a movable epigynum (Figs 4G, 5G) and the males having a longer and sharper embolus proper (Figs 2D, 3D) which generally is pointed in “micronetines” (Fig. 6F); Fickert’s gland located in the membranous area outside the radix (Figs 2D, 3D), rather than embedded within the radix as usually the case in “micronetines” (Fig. 6G). This suggests that the two species are not congeneric with Acanthoneta.

Bottom Line: To distinguish from other genera with similar genitalic characters, we compare the new genus with the species of Acanthoneta Eskov & Marusik, 1992, Epibellowia Tanasevitch, 1996 and Wubanoides Eskov, 1986.Furthermore, redescriptions of the epigynal morphology of Acanthoneta aggressa Chamberlin & Ivie, 1943 (Nearctic) and on the male of A. dokutchaevi Eskov & Marusik, 1993 (Far East Asia, firstly recorded from China) are provided.Based on comparison with Poeciloneta, from which Acanthoneta stat. n. was separated by Saaristo and Tanasevitch (1996), a revised diagnosis is proposed to support the generic status.

View Article: PubMed Central - HTML - PubMed

Affiliation: College of Life Sciences, Capital Normal University, Xisanhuanbeilu Str. 105, Haidian Dist., Beijing, 100048, P. R. China.

ABSTRACT
A new "micronetine" genus Acanoides gen. n. is erected to accommodate two species from China: Acanoides beijingensis sp. n. as the type species and Acanoides hengshanensis (Chen & Yin, 2000), comb. n., with the females described for the first time. The genitalic characters and somatic features of the new genus were studied by means of light microscopy and scanning electron microscopy (SEM). The monophyly of the new genus was tested by a phylogenetic analysis based on molecular data. Descriptions of the new genus, the new species and the new combination are presented; SEM images and microscopy pictures of somatic and genitalic characters are provided in detail. To distinguish from other genera with similar genitalic characters, we compare the new genus with the species of Acanthoneta Eskov & Marusik, 1992, Epibellowia Tanasevitch, 1996 and Wubanoides Eskov, 1986. Four putative synapomorphies for Acanoides gen. n. are suggested to support its monophyly that could be tested in the future. Furthermore, redescriptions of the epigynal morphology of Acanthoneta aggressa Chamberlin & Ivie, 1943 (Nearctic) and on the male of A. dokutchaevi Eskov & Marusik, 1993 (Far East Asia, firstly recorded from China) are provided. Based on comparison with Poeciloneta, from which Acanthoneta stat. n. was separated by Saaristo and Tanasevitch (1996), a revised diagnosis is proposed to support the generic status.

No MeSH data available.