Ebo Keyserling, 1884

Muster, Christoph, 2009, The Ebo-like running crab spiders in the Old World (Araneae, Philodromidae), ZooKeys 16 (16), pp. 47-73: 51-53

publication ID

http://doi.org/ 10.3897/zookeys.16.230

publication LSID

lsid:zoobank.org:pub:6B4079A5-659D-490D-84E7-A4AF071EF091

DOI

http://doi.org/10.5281/zenodo.3792032

persistent identifier

http://treatment.plazi.org/id/641387CF-BC35-9142-DEBE-8742B6A3FE69

treatment provided by

Plazi

scientific name

Ebo Keyserling, 1884
status

 

Genus Ebo Keyserling, 1884  

Ebo Keyserling, 1884: 678   . – Simon 1895: 1063; Schick 1965: 84 (subgenus Ebo   ); Sauer and Platnick 1972: 36-37 (subgenus Ebo   ); Dondale and Redner 1978: 29-30 (ad part.).

Type species. Ebo latithorax Keyserling, 1884   by monotypy

Material examined. Ebo evansae Sauer & Platnick, 1972: USA: Utah: 4♁, 4♀, Salt Lake City, dry canyon, 40° 46’N, 111° 50’W, 11 March 1944, leg. W. Ivie (AMNH)   .

Ebo latithorax   : USA: Pennsylvania: 2♁, Rector , 40° 12’N, 79° 14’W, 20 June 1967, leg. B. Vogel (AMNH). Ebo cf. latithorax   GoogleMaps   : USA: Kansas: 1♁, 5♀, Ellsworth , 38° 34’N, 98° 14’W, 23 August 1935, leg. W. Ivie (AMNH). Ebo pepinensis Gertsch, 1933   GoogleMaps   : USA: Utah: 3♁, 3♀, west side of Utah Lake , 40° 16’N, 111° 56’W, 11 March 1934, leg. W. Ivie (AMNH) GoogleMaps   .

Diagnosis. Philodromid spiders with enlarged AME (AME size index 0.067-0.08) and extremely elongated leg II (Leg II length index 1.5-2.2). Prosoma wider than long ( Fig. 11 View Figures 7-16. 7, 11 ). Clypeus low (Clypeus height index <0.1, Fig. 7 View Figures 7-16. 7, 11 ). Leg formula 2143. Spination of legs generally reduced with species-specific modifications (males of E. latithorax   are completely spineless), tibiae and metatarsi always without pro- and retrolateral spines. Metatarsus III and IV ventral 2-2-2 (except E. latithorax   ). Patella of male palp without apophysis, tibia with indistinct VTA (sometimes completely reduced) and small, weakly sclerotized RTA. Embolus curved, its tip flexible, pointing to retrolateral side ( Fig. 2 View Figures 1-6. 1, 4 ). Tegulum without apophysis. Conductor a retrolateral shallow groove. Epigyne weakly sclerotized, without atrium or grooves, epigynal suture entirely shifted to epigastric furrow. Glandular heads separated from receptacula, connected by thin ducts.

Remarks. The Nearctic Ebo   species were thoroughly revised by Schick (1965) and Sauer and Platnick (1972). In both these studies Titanebo   described by Gertsch (1933) was regarded a subgenus of Ebo   . All Nearctic species indeed share a number of characters, e.g. the lack of PTA, the curved embolus with a flexible tip and the constitution of the conductor. However, the leg spination pattern is strikingly different, with Titanebo   resembling Rhysodromus (the Philodromus histrio   group) and Halodromus   gen. n. Ebo   and Titanebo   are also different in the structure of the female genitalia and in some morphometric indices ( Table 1 View Table 1 ). In none of the phylogenetic analyses performed by Muster (2009) did Titanebo   emerge as sister to Ebo   . In conclusion, Titanebo   clearly deserves generic re-establishment.

Composition and distribution. The centre of diversity is undoubtly North America. Sauer and Platnick (1972) included seven Nearctic species in the subgenus Ebo   : E. contrastus Sauer & Platnick, 1972   , E. evansae Sauer & Platnick, 1972   , E. iviei Sauer & Platnick, 1972   , E. lathithorax Keyserling, 1884   , E. merkeli Schick, 1965   , E. pepinensis Gertsch, 1933   , and E. punctatus Sauer & Platnick, 1972   . Two further species were added by Platnick (1972) and Cokendolpher (1978), E. bucklei Platnick, 1972   , and E. redneri Cokendolpher, 1978   . Old World species described in Ebo   are either transferred to Halodromus   gen. n. or Philodromus   , or they are regarded together with three Neotropical species as incertae sedis.

Table 1. Morphometric indices in Ebo-like philodromid genera. Leg II length index = length femur II/femur I; AME size index = diameter AME/CW; PME interdistance index = PME-PME/PME-PLE; clypeus height index = ClyH/CW.

  Ebo   Titanebo   Halodromus   Philodromus histrio   group
males        
leg II length index 1.6 - 2.1 1.5 - 1.7 1.4 - 1.5 1.1 - 1.4
AME size index 0.071 - 0.077 0.054 - 0.076 0.063 - 0.084 0.035 - 0.058
PME interdistance index 1.88 - 2.11 1.80 - 2.07 1.56 - 2.00 1.63 - 3.00
clypeus height index 0.08 - 0.10 0.14 - 0.18 0.12 - 0.21 0.16 - 0.18
females
leg II length index 1.5 - 2.2 1.4 - 1.7 1.3 - 1.6 1.1 - 1.3
AME size index 0.067 - 0.068 0.060 - 0.067 0.061 - 0.087 0.038 - 0.053
PME interdistance index 1.88 - 2.26 1.69 - 1.87 1.35 - 2.09 1.46 - 2.33
clypeus height index 0.09 - 0.10 0.15 - 0.18 0.11 - 0.18 0.16 - 0.18

Table 1. Morphometric indices in Ebo   -like philodromid genera. Leg II length index = length femur II/femur I; AME size index = diameter AME/CW; PME interdistance index = PME-PME/PME-PLE; clypeus height index = ClyH/CW.

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Araneae

Family

Philodromidae

Loc

Ebo Keyserling, 1884

Muster, Christoph 2009
2009
Loc

Ebo

Dondale CD & Redner JH 1978: 29
Sauer RJ & Platnick NI 1972: 36
Schick RX 1965: 84
Simon E 1895: 1063
Keyserling E 1884: 678
1884