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1 January 2020 On Megalepthyphantes lydiae Wunderlich, 1994 (Araneae: Linyphiidae)
Andrei V. Tanasevitch
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Abstract

Megalepthyphantes lydiaeWunderlich, 1994 is redescribed and illustrated on the basis of new material from Greece. Judging from the structure of the palp, this species is similar to the north-African M. auresensisBosmans, 2006 and M. bkheitae (Bosmans & Bouragba, 1992). In the peculiar shape of its embolus M. lydiae resembles the Irano-Caucasian M. camelus (Tanasevitch, 1990). From these species M. lydiae is clearly distinguished by structural details of the genitalia in both sexes.

INTRODUCTION

Megalepthyphantes lydiae Wunderlich, 1994 was originally described from Greece on the basis of a male and a female from Naxos Island, and a female from Epidaurus (Wunderlich, 1994). A re-examination of the male holotype revealed that the author illustrated a left palp with a broken distal part of the lamella characteristica, while the right palp is intact. Spider material collected by Antoine Senglet from Greece in 1972 contains a male and two females of M. lydiae. The redescription and illustration of this species is the subject of the present paper.

MATERIAL AND METHODS

This paper is based on material kept at the Muséum d'histoire naturelle de Genève, Switzerland (MHNG) and the Senckenberg Museum Frankfurt am Main, Germany (SMF). Specimens preserved in 70% ethanol were studied using a MBS-9 stereomicroscope. The terminology of copulatory organs mainly follows that of Merrett (1963) and Saaristo & Tanasevitch (1996). The chaetotaxy is given in a formula, e.g., Ti I: 2-1-1-2(3), which means that tibia I has two dorsal spines, one pro-, one retrolateral spine, and two or three ventral spines (the apical spines are disregarded). The sequence of leg segment measurements is as follows: total length (femur+patella+tibia+metatarsus+tarsus). All measurements are given in mm. All scale bars in the figures correspond to 0.1 mm.

Abbreviations

Ca

carina sensu Saaristo & Tanasevitch (1996)

DPS

distal part of scape sensu Saaristo & Tanasevitch (1996)

E

embolus

EP

embolus proper sensu Saaristo (1971)

L

lamella characteristica

MM

median membrane sensu Helsdingen (1965)

PH

pit hook sensu Saaristo & Tanasevitch (1996) = distal suprategular apophysis sensu Hormiga (2000)

PMP

posterior median plate sensu Helsdingen et al. (1977)

PS

proscape sensu Saaristo & Tanasevitch (1996)

SS

serrate surface of embolus sensu Saaristo & Tanasevitch (1996)

T

tooth

TA

terminal apophysis

TmI

position of trichobothrium on metatarsus I

RESULTS

Megalepthyphantes lydiae Wunderlich, 1994
Figs 1-13

  • Type material examined: SMF, #39732 and #39756; male holotype and female paratype of M. lydiae; GREECE, Naxos; XI.1983; leg. J. Wunderlich.

  • Other material examined: MHNG; 1 male, 2 females; GREECE, Aetolia-Acarnania, between Chrisovergi and Aitolikón; 14.IX.1972; leg. A. Senglet.

  • Description of male from Aetolia-Acarnania: Total length 4.25. Carapace 1.90 long, 1.45 wide, unmodified, pale brown to yellow, dorsally with a narrow, dark, longitudinal stripe becoming bifurcated in cephalic part. Chelicerae 0.75 long, unmodified. Legs yellow, distal ends and middle parts of segments darkened. Leg I 11.30 long (3.00+0.55+3.00+3.00+1.75), IV 8.20 long (2.50+0.45+1.95+2.05+1.25). Chaetotaxy. FeI: 0-1-0-0, II-IV: 0-0-0-0; TiI: 2-1-1-2(3), II: 2-0-1-2(3), III: 2-1-1-1(0), IV: 2-1-1-0; MtI-IV: 1(2)-1-1-0. TmI 0.14. Metatarsi IV without trichobothrium. Palp (Figs 1-10): Patella with two curved special spines (see Saaristo & Tanasevitch, 1996) of different sizes. Tibia dorsally with a short ridge and a rounded depression in its retrolateral side. Paracymbium relatively large, proximal part with a tooth (“T” in Fig. 5). Lamella characteristica massive, bent in distal third, with a beak-shaped apex. Terminal apophysis consisting of three parts: a small, straight, wide ridge and two narrow processes: one straight, pointed, stylet-shaped, other one bent and blunt. Embolus relatively large, its serrate surface extended forwards, forming a spear-shaped apex. Carina very small, thumb large, rounded. Embolus proper short, pointed. Abdomen 2.50 long, 1.50 wide, dorsally pale, with two longitudinal rows of grey sports interconnected by transverse stripes.

  • Description of female from Aetolia-Acarnania: Total length 4.35. Carapace 1.75 long, 1.30 wide. Chelicerae 0.80 long. Leg I 9.85 long (2.65+2.55+0.6+2.50+1.55), IV 8.70 (2.60+2.05+0.5+2.25+1.30). TmI 0.16. Metatarsi IV without trichobothrium. Abdomen 2.55 long, 1.75 wide. Epigyne (Figs 11-13): Proscape strongly sclerotized, slightly narrowed at its base. Distal part of scape swollen, lateral lobes and stretcher totally reduced. Posterior median plate blackish, with a deep median notch in distal margin. Body and leg coloration, and chaetotaxy as in male.

  • Taxonomic remarks: The structure of the palp of this species is similar to that of the north-African M. auresensis Bosmans, 2006 and M. bkheitae (Bosmans & Bouragba, 1992). The shape of the embolus, particularly the serrate surface extended forwards and forming a spear-shaped apex, of M. lydiae resembles that of the Irano-Caucasian M. camelus (Tanasevitch, 1990). From the three species mentioned above M. lydiae is clearly distinguished by the structural details of its male palp, especially by the shape of the apophysis on the palpal tibia, and by the structure of the paracymbium and the lamella characteristica. The shape of the epigyne of M. lydiae is similar to that of many congeners, but differs clearly by the deeply notched posterior median plate.

  • Distribution: Known only from Greece: Naxos Island and Epidaurus (Wunderlich, 1994), as well as Aetolia-Acarnania (new data).

  • Figs 1-10.

    Megalepthyphantes lydiae Wunderlich, 1994, details of left palp of male specimen from Aetolia-Acarnania. (1) Distal part of palp, retrolateral view. (2-4) Tibia, prolateral, dorsal and retrolateral view, respectively. (5) Paracymbium, retrolateral view. (6) Lamella characteristica, retrolateral view. (7) Embolic division, retrolateral view. (8-10) Embolus, different aspects.

    img-z2-5_147.jpg

    Figs 11-13.

    Megalepthyphantes lydiae Wunderlich, 1994, epigyne of specimen from Aetolia-Acarnania. (11-13) Ventral, lateral and dorsal view, respectively.

    img-z3-16_147.jpg

    ACKNOWLEDGEMENTS

    I am greatly indebted to Peter Jäger and Julia Altmann (SMF), who provided the type material under their care, as well as to Peter Schwendinger (MHNG) for the opportunity to work with the collections of the MHNG and for editing the manuscript. Thanks also go to Dragomir Dimitrov (National Museum of Natural History, Sofia, Bulgaria) who kindly reviewed the manuscript.

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    Andrei V. Tanasevitch "On Megalepthyphantes lydiae Wunderlich, 1994 (Araneae: Linyphiidae)," Revue suisse de Zoologie 126(2), 147-150, (1 January 2020). https://doi.org/10.5281/zenodo.3463439
    Accepted: 12 April 2019; Published: 1 January 2020
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    Greece
    Mediterranean
    Micronetinae
    redescription
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