NO. 4 SCHULTZ: ISOPODA 21 



IDOTHEIDAE 



Synidotea Harger 



Synidotea calcarea, n. sp. 



(Plate 15) 

 Synidotea calcarea Schultz, 1964, p. 314, noinen nudum. 



Diagnosis: Abdomen bluntly rounded, spatulate with several small 

 teeth on posterolateral margins. Tubercles in front of eyes and antero- 

 medial tubercles submarginal ; dorsum of head bearing two very large 

 conical tubercles. Eyes not stalked, lightly pigmented with few ocelli. 

 Peraeonal segments bearing two or three dorsolateral longitudinal rugae 

 with two large mediolateral tubercles. Whole body covered with fine 

 short hairs and margins of peraeonal segments and cephalon minutely 

 serrated. Pleotelson crossed by three suture lines, indicating presence of 

 four former segments; first pleonal suture continuous with grooves in 

 lateral margins of pleotelson. Peraeopod one with long ungus ; dactylus 

 and propodus somewhat chelate. No peraeopods bearing projecting 

 flanges on article two (basis). Antenna one with only four segments; 

 antenna two with five peduncular and six flagellar segments. Maxilli- 

 pedal palp much wider than endite; endite with several sensory setae. 

 Mandible with toothed incisor; lacinia mobilis with setal row; molar 

 process toothed. Endopod of maxilla one with two sensory projections. 

 Uropods with two sensory dorsolateral setal spines. 



Measurements: Holotype female 6.0 mm long. 



Type locality: 6833; Tanner Canyon; 813 m; Jan. 29, 1960; green 

 mud and sand. Lat. 32° 37' 54"N, Long. 118° 58' 40"W. 



Materials exainined: 6833(3). 



Distribution: Known only from type locality. 



Affinities: The new species is closely related to Synidotea magnifica 

 Menzies and Barnard (1959), but it has fewer ocelli and less pigment 

 and a less rugose appearance. Two very large rounded, conical tubercles 

 are found on the cephalon between the eyes and there are fewer flagel- 

 lar articles on the second antenna. The pleotelson is widest at the base 

 in S. magnifica and at half its length in S. calcarea. 



