Cybaeus minor Chyzer, 1897,

Isaia, Marco & Chiarle, Alberto, 2015, Taxonomic notes on Cybaeus vignai Brignoli, 1977 (Araneae, Cybaeidae) and Dysdera cribrata Simon, 1882 (Araneae, Dysderidae) from the Italian Maritime Alps, Zoosystema 37 (1), pp. 45-56: 50-52

publication ID

http://doi.org/ 10.5252/z2015n1a3

publication LSID

lsid:zoobank.org:pub:urn:lsid:zoobank.org:pub:C123E632-E3CB-4D61-B075-AE554E6394F5

persistent identifier

http://treatment.plazi.org/id/5D49879F-3859-F650-FC45-15A5FB16F953

treatment provided by

Felipe

scientific name

Cybaeus minor Chyzer, 1897
status

 

Cybaeus minor Chyzer, 1897 

( Fig. 4CView FIG)

Cybaeus minor Chyzer  in Chyzer & Kulczyn’ski, 1897: 153, plate 6, fig. 9. — Loksa 1969: 116, fig. 79C, G. — Brignoli 1978 g: 508, figs 76-78. — Polenec 1985: 103, figs 5-7. — Maurer 1992: 151, figs 9-12, 15, 17.

MATERIAL EXAMINED. — Italy. Lombardia (BG): 2♂, 1♀, moraine, road to Passo Campelli, Schilpario, 1750 m, 28.VII-18.X.2005, leg.

Museo di Scienze BG (coll. MI). Veneto ( TV): 1♀, Monte Grappa, Bassano, 28.IX.1977, leg. K. Thaler ( IZUI A7115) [sub C. intermedius  in Maurer (1992)].

REMARKS

Considering the genital morphology of males and females of the minor  group, the match between male and female of C. vignai  suggested by Maurer & Thaler (1988) seems highly questionable. The hypothesis of a misidentification is supported by the co-occurrence of the newly collected males with females of C. vignai  . Additionally, we found at the same localities females of C. intermedius  and males corresponding to that illustrated in Maurer & Thaler (1988) as C. vignai  . When examining material from Maritime Alps and comparing it to C. intermedius  from different Italian localities, it became clear that the previous “doubtful male” (and part of the males found in our samplings), belongs in reality to C. intermedius  . The same is the case for the male illustrated in Isaia et al. (2011: 92, 152, figs A, B, C) and wrongly attributed to C. vignai  .

Concerning the identification of females, the borders and the upper vertices of the atrium are the most diagnostic characters allowing the separation of the species. In C. intermedius  the upper border is thickened at the vertices and the lateral borders are clearly visible. In C. montanus  the upper vertices are similar to those of C. intermedius  , but the lateral borders are only weakly visible. In C. minor  the upper border of the atrium is strongly thickened, the vertices are rounded and the lateral borders are clearly visible ( Fig. 4View FIG).

Similarly, examination of the females from the Maritime Alps identified as C. montanus  by in Maurer (1992) revealed that they belong instead to C. intermedius  . Consequently, it seems reasonable to assume that all previous records of C. montanus  from the Maritime Alps as well as from the western Alps, including the two females of C. angustiarum  from the Maritime Alps cited by Brignoli (1977: 30, fig. 6) and cited in Isaia et al. (2007), belong to C. intermedius  . The presence of C. montanus  in the western Alps is thus not supported anymore.

Concerning C. minor  , we examined material of this species from Veneto that was wrongly reported in Maurer (1992) as C. intermedius  . Hence we question the presence of C. intermedius  in the eastern Alps.

According to the morphology of the palp and female internal genitalia, C. vignai  seems more closely related to C. raymondi (Simon, 1916)  (endemic to French Pyrenees) and C. tetricus (C. L. Koch, 1839)  (central Europe) than to the species of the minor  group discussed by Maurer (1992: 153, figs 25-26, 29-30).

In their recent revision of the Nearctic species of Cybaeus, Copley et al. (2009)  groups the Holarctic and Nearctic species in eight species group, which are partially supported by molecular evidence. According to the in-line position of the spermathecal heads in respect to the rest of the vulval ducting, and according to the presence of a relatively large epyginal atrium, the species of the minor  group, as well as C. vignai  , are assigned to the tetricus  group.

DISTRIBUTION ( FIG. 5View FIG)

Records of C. vignai  are so far restricted to a few localities in the Italian and French Maritime Alps. Males have been found at two Italian localities (Valle Gesso: Palanfrè and Bousset), while previous records of females are given by Isaia et al. (2011) and citations therein (Valle Pesio: Certosa di Pesio; Valle Vermenagna: Vernante), and by Maurer and Thaler (1988) ( France: Forêt de Turini: Le Moulinet). According to our interpretation, previous records of males have to be referred to C. intermedius  . However, it is likely that the species is more widespread in the SW Alps. According to the new records, the distribution of C. intermedius  extends from Tessin and Bergamo Prealps, across the western Alps and down to the French and Italian Maritime Alps (where it occurs sympatrically with C. vignai  ), the Ligurian Apennines and, according to Pesarini (2003), down to the Tuscan-Emilian Apennines. C. intermedius  is here recorded for the first time in France.

According to our findings, C. montanus  seems to be restricted to the Prealps of Lugano and Bergamo. Records from Veneto ( Ballarin et al. 2011) and Toscana ( Maurer 1992) remain to be verified.

HABITAT AND PHENOLOGY

The three species of Cybaeus  dealt with here occur predominantly in the litter of broad-leaved forest, especially beech, although C. vignai  , is also found in caves ( Isaia et al. 2011). Adults are generally collected in summer.

TV

Centro de Estratigrafia e Paleobiologia da Universidade Nova de Lisboa

IZUI

Institut fuer Zoologie der Universitat Innsbruck

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Cybaeidae

Genus

Cybaeus

Loc

Cybaeus minor Chyzer, 1897

Isaia, Marco & Chiarle, Alberto 2015
2015
Loc

Cybaeus minor

MAURER R. 1992: 151
POLENEC A. 1985: 103
LOKSA I. 1969: 116
1969