Stygnicranaus, ROEWER, 1913

Orrico, Victor G. D. & Kury, Adriano B., 2009, A cladistic analysis of the Stygnicranainae Roewer, 1913 (Arachnida, Opiliones, Cranaidae) - where do longipalp cranaids belong?, Zoological Journal of the Linnean Society 157 (3), pp. 470-494 : 472-474

publication ID

https://doi.org/ 10.1111/j.1096-3642.2009.00543.x

DOI

https://doi.org/10.5281/zenodo.10545948

persistent identifier

https://treatment.plazi.org/id/03DA4503-FFE2-7311-099B-F8A84BC3F8A1

treatment provided by

Felipe

scientific name

Stygnicranaus
status

 

STYGNICRANAUS ROEWER, 1913 View in CoL

Stygnicranaus Roewer, 1913: 423 View in CoL ; 1923: 570; Mello- Leitão, 1926: 365; Roewer, 1931: 147; Mello-Leitão,

KEY TO THE THREE GENERA OF LONGIPALP CRANAIDAE (STYGNICRANAINAE) View in CoL

1. Ocularium very wide (80% the width of carapace), extremely low (barely elevated from carapace); carapace much shorter than abdominal scutum ( Figs 20–21 View Figures 20–21 )................................................................................. Tryferos Ocularium View in CoL narrow (about 40–50% the width of carapace). moderately high (at least as high as two eye diameters); carapace only slightly shorter than abdominal scutum ( Figs 2–3 View Figures 2–3 , 6–7 View Figures 6–7 , 14–15 View Figures 14–15 ) .................................................. 2 2. Ocularium with a pair of minute tubercles; all areas of dorsal scutum entirely unarmed; outline of scutum in dorsal view alpha (subrectangular, with the median laterals bulging, widest at area I–II) ( Figs 14–15 View Figures 14–15 ) ... Agathocranaus Ocularium View in CoL with a pair of strong spines; scutal area III with a pair of stout acuminate spines; outline of scutum in dorsal view pyriform, with widest portion at area IV ( Figs 2–3 View Figures 2–3 , 6–7 View Figures 6–7 )............................................. Stygnicranaus

1932: 128; Kury, 1995: 32, 2003: 102 (type species Stygnicranaus abnormis Roewer, 1913 , by monotypy).

Genus diagnosis: Dorsal scutum divided into three areas (original area IV completely fused to area III); outline of scutum attenuate pyriform, mesotergal area armed with a pair of high, divergent, straight spiniform processes, pedipalpal femur completely unarmed, much elongated and pedipalpi tarsi and tibia forming subchela.

Included species: Stygnicranaus abnormis Roewer, 1913 ; Stygnicranaus concolor Kury, 1995 ; Stygnicranaus alessandroi sp. nov.; and Stygnicranaus poncedeleoni sp. nov.

Remarks: The ‘male’ holotype of S. abnormis is actually a female. In this genus, (known) females are

KEY TO THE SPECIES OF STYGNICRANAUS View in CoL

1. Lateral border of scutum without clearly marked posterior yellow spot; outline of dorsal scutum widest at middle portion; ocularium without pearly tubercles; free tergite II with a pair of robust paramedian spines; dorsoapical apophysis of coxa IV clearly marked ........................................................................................ S. concolor Lateral View in CoL border of scutum with clearly marked posterior yellow spot; outline of dorsal scutum widest more posteriorly, at area IV; ocularium with pearly tubercles; free tergite II with only a pair of minute granules; dorsoapical apophysis of coxa IV unclear, replaced by group of granules.......................................................................................2. 2. Cluster of pearly tubercles at the side of the carapace absent; hyaline portion of cheliceral sockets without pearly tubercles ........................................................................................................................... S. abnormis Cluster View in CoL of pearly tubercles at the side of the carapace present; hyaline portion of cheliceral sockets with pearly tubercles .............................................................................................................................................3. 3. Femur IV armed proximally with small spines; anterior border of scutum with two large spines at pedipalpus level;

scutum without any whitish spot; scutum densely covered with numerous dark irregular spots..... S. alessandroi Femur IV armed proximally with small pearly tubercles; anterior border of scutum with three small spines at pedipalpus level; scutum with inverted Y-shaped whitish spot formed by smaller independent units; scutum without dark spots......................................................................................................................... S. poncedeleoni quite similar to males, with analogous armature and just a few dimorphic characters. Pedipalpi for all species within this genus are extremely similar. For the sake of conserving space, illustrations of the pedipalpus are provided only for S. poncedeleoni .

Kingdom

Animalia

Phylum

Arthropoda

Class

Arachnida

Order

Opiliones

Family

Cranaidae

Loc

Stygnicranaus

Orrico, Victor G. D. & Kury, Adriano B. 2009
2009
Loc

Stygnicranaus

Roewer C-F 1931: 147
Roewer C-F 1923: 570
Roewer C-F 1913: 423
1913
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