Orsinome vethi ( Hasselt, 1882 )

Caleb, John T. D., Ghosh, Dibyajyoti & Kumar, Vikas, 2018, On two new synonyms of the orb-weaving spider Orsinome vethi (Hasselt, 1882) (Araneae, Tetragnathidae), Zootaxa 4444 (3), pp. 342-346: 342-346

publication ID

https://doi.org/10.11646/zootaxa.4444.3.9

publication LSID

lsid:zoobank.org:pub:5402B398-0B0D-4664-93AA-059C1258643E

persistent identifier

http://treatment.plazi.org/id/1756C462-FFB6-FF8F-FF2E-56FFA046CBB8

treatment provided by

Plazi

scientific name

Orsinome vethi ( Hasselt, 1882 )
status

 

Orsinome vethi ( Hasselt, 1882)  ( Figs 1 View Figure –9, 16–32)

Pachygnatha vethii Hasselt, 1882: 32  (Description of ♂).

Orsinome vethi Thorell, 1890: 209  (Description of ♀); Simon, 1895: 736, figs. 798–800.

Leucauge lygisma Wang, 1991: 154  , f. 10–12 (Misidentification; description and illustration of ♂); Song, Zhu & Chen, 1999: 216, f. 121J, 122G–H, 130N–O (Misidentification; description and illustration of ♂).

Orsinome vethi Zhu, Song & Zhang, 2003: 295  , figs. 165A–F, 166A–G, pl. XA–D (Description and illustration of ♂ & ♀); Jäger & Praxaysombath, 2009: 33, figs. 19–23 (Illustration of ♀); Álvarez-Padilla & Hormiga, 2011: 791, figs. 100A–G, 101A–H, 102A– F, 103A–F, 104A–D (Description and illustration of ♂ & ♀); Sankaran et al., 2017: 319, f. 12J–K, 20A–F, 21A–G (Illustration of ♂ & ♀)

Orsinome listeri Gravely, 1921: 449  , f. 7c (Misidentification; description of ♂&♀ and illustration of ♂). Type material kept at NZC-

ZSI examined. New synonymy.

Labulla nepula Tikader, 1970: 21  , figs. 13a–d (Misidentification; description and illustration of ♂&♀). Holotype female, allotype

male and paratype female kept at NZC-ZSI examined. New synonymy.

Type material of Labulla nepula Tikader, 1970  : ♀ (holotype) (NZC-ZSI-A/305; 3248/18); ♂ (allotype) (NZC-ZSI-A/ 307; 3249/18); ♀ (paratype) (NZC-ZSI-A/306; 3250/18) from the Bank of Great Rangit River , 20 September 1959, West Sikkim; all leg. B. K. Tikader. 

Type material of Orsinome listeri Gravely, 1921: 2  ♀♀ & 2♂♂ (NZC-ZSI-9978/17) from Peshok (=Pashok), Darjeeling district, Eastern Himalayas, 26 May – 14 June 1916, West Bengal; all leg. F. H. Gravely.

AdditiONal material: 1♀ (ZSI-CDT-AA191) from Balipara (26.825714° N, 92.775494° E) 84 m, Assam, 14 November 2015; 1 subadult ♂ (ZSI-CDT-AA204), Bishwanathghat (26.658769° N, 93.175767° E), 84 m, Assam, 8 November 2015, leg. Shantanu Kundu; 1♂ (ZSI-CDT-AA1312) & 1♀ (ZSI-CDT-AA1313) from Ashaley river bed (27.011198° N, 88.770108° E) 692 m, Neora Valley, West Bengal, 0 8 March 2017, leg. Dibyajyoti Ghosh.

JustiFicatiON OF syNONymy OF Labulla nepula  . L. nepula Tikader, 1970  was described based on three specimens (holotype female, allotype male and a paratype female) from Sikkim, India. Tikader (1970) has been critically assessed for assigning several species to wrong genera ( Brignoli 1976; Breitling 2015). Hormiga & Scharff (2005) reasoned precisely that this species was misplaced in the genus Labulla Simon, 1884  . Detailed examination of the type material revealed that the species was both misidentified as well as misclassified. The species actually belongs to the tetragnathid genus Orsinome Thorell, 1890  . The general morphology and abdominal pattern of the holotype female and allotype male show striking resemblance to specimens illustrated by Zhu et al. (2003) and Sankaran et al. (2017) (cf. figs. 165A & C in Zhu et al., 2003 and figs. 20A–F in Sankaran et al., 2017 with Figs. 1, 2 View Figure & 6–8 herein). The epigynum of the holotype was not dissected and is intact. It clearly shows a medial common copulatory opening (cf. fig. 21 in Jäger & Praxaysombath, 2009 with Fig. 9 herein). The male palp shows the characteristic diagnostic features such as the long and well-sclerotized embolus with its distal part resting on the subtegulum and the dorsomedian process on the cymbium ( Álvarez-Padilla & Hormiga, 2011) (cf. figs. 166E–G in Zhu et al., 2003 and figs. 21A–D in Sankaran et al., 2017 with Figs. 3–5 View Figure herein). Based on these characters both the female holotype and the male allotype are identified as O. vethi  and L. nepula  is thus considered a junior synonym of the former.

The paratype female however does not belong to Orsinome  but rather fits in the genus Tylorida Simon, 1894  . The general morphology, color pattern and genitalia match with that of T. ventralis ( Thorell, 1877)  ( Figs 10–15 View Figure ). The abdomen lacks a posterior caudal tubercle ( Figs 13–14 View Figure ) and falls into the category, variety I of T. ventralis  (sensu Sankaran et al. 2017: figs. 16H–J). The epigynum morphology corresponds well with the epigynum of variety I as illustrated by Sankaran et al. (2017) (cf. Fig. 15 View Figure herein with figs. 18J–L in Sankaran et al., 2017).

JustiFicatiON OF syNONymy OF Orsinome listeri  . Gravely (1921) described O. listeri  based on specimens from Peshok and Singla, Darjeeling district, West Bengal, India. The species is known only from its original description. Detailed examination of the type material revealed that the species unambiguously matches O. vethi  in general morphology (cf. figs. 165A & C in Zhu et al., 2003 and figs. 20A–F in Sankaran et al., 2017 with Figs. 16–17 View Figure herein); the male cheliceral dentition with three promarginal teeth (one large and two small), two retromargin teeth, a large tubercle and a tiny tubercle at the base (cf. fig 7c in Gravely 1921, fig 166 D in Zhu et al,. 2003 and figs. 12 J in Sankaran et al., 2017 with Figs. 20–22 View Figure herein); the male palpal structure (see characters mentioned above; Figs 24–28 View Figure ) and the epigynum ( Figs 29–31 View Figure ); the internal duct system ( Fig 32 View Figure ) is identical to those illustrated in Zhu et al. (2003; fig 165 F) and Sankaran et al., (2017; fig 21 G). Based on these observations, we consider O. listeri  as a junior synonym of O. vethi  .

DistributiON. The species has a wide oriental distribution known from India, China, Vietnam, Laos, Malaysia, Sumatra, Java, to Flores ( WSCAbout WSC, 2018).

WSC

Westfield State College, Museum and Herbarium

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Tetragnathidae

Genus

Orsinome

Loc

Orsinome vethi ( Hasselt, 1882 )

Caleb, John T. D., Ghosh, Dibyajyoti & Kumar, Vikas 2018

2018
Loc

Pachygnatha vethii

: 32

Loc

Orsinome vethi

: 209

Loc

Orsinome vethi

: 295 : 33 : 791 : 319

Loc

Orsinome listeri

: 449

Loc

Labulla nepula

: 21