Cyrtognatha atopica, Dimitrov & Hormiga, 2009

Dimitrov, Dimitar & Hormiga, Gustavo, 2009, Revision And Cladistic Analysis Of The Orbweaving Spider Genus Cyrtognatha Keyserling, 1881 (Araneae, Tetragnathidae), Bulletin of the American Museum of Natural History 2009 (317), pp. 1-140 : 37

Cyrtognatha atopica , new species Figure 9

TYPE: Male holotype from Argentina, Misiones, P. Prov. Cruce Caballero, San Pedro. Lat. 26.46667, long. 53.96667. 13– 16.i.2005, Grismado, Lopardo, Piacentini, Quaglino, and Rubio ( MACN).

ETYMOLOGY: The species epithet is an adjective and is derived from the Greek word topikos (‘‘of a place, local’’) in reference to the unknown precise locality of the first specimen of this species examined by the authors.

DIAGNOSIS: Easily distinguished from oth- er Cyrtognatha species by the morphology of the embolus and the conductor. Very large part of the embolus free; metine embolic apophysis ends as a long (almost as long as the embolus) curved lamina (fig. 9A–C). Apical apophysis of the conductor with a small outgrowth (fig. 9A) near its base. Distinguished from the very similar species C. eberhardi by the more globular tip of the paracymbium, the shape of the basal apophysis of the conductor, and the shape of the embolus (in C. eberhardi its tip is additionally curved so that the embolus end has an S shape). The basal apophysis of the conductor in C. eberhardi carries a long sharpened apophysis (fig. 10A), which is not present in C. atopica .

DESCRIPTION: Male (holotype). Habitus as in figure 9D–G. Carapace brown with a wellmarked fovea. Abdomen brownish with silvery guanine spots. Distal tubercle extending dorsally over the spinnerets along the longitudinal axis of the abdomen. As a result of the orientation of its distal tubercle, the abdomen has cylindrical shape. Total length 5.39. Cephalothorax 1.96 long, 1.37 wide, 0.80 high. Abdomen 3.43 long, 0.93 wide, 0.73 high. Sternum with slightly clearer pigmentation in the center; 0.98 long, 0.93 wide. Clypeus height 1.4 times one AME diameter. Diameter of the AME 0.2. Distance between AME almost equal to their diameter and between them and ALE 1.5 times one AME diameter. Distance between AME and PME about one AME diameter. PME separated by distance nearly equal to their diameter. AME slightly larger than the rest of the eyes. Chelicerae (fig. 9E) brown with dorsal tooth distally outlying from the joint of the cheliceral fang. Femur I 4.9, 2.5 times the length of the cephalothorax. Pedipalp as in figure 9A–C. Palpal tibia length 0.30; cymbium length 1.08.

Female. Unknown.

DISTRIBUTION: The ‘‘S. A.’’ abbreviation on the label of the second specimen most probably refers to South America. It is evident that based on this information alone it is impossible to determine very accurately the exact locality beyond the fact that it was collected somewhere in Brazil (fig. 5). The other known locality for this species is the Misiones province in the north of Argentina close to the boundary with Brazil.

ADDITIONAL MATERIAL EXAMINED: BRAZIL: S. A. (South America), Nathan Banks, 1 male (MCZ 66541).