476 U.S. NATIONAL MUSEUM BULLETIN 271 



Thaumatelson Walker 



Thaumatelson Walker, 1906b, 1907. 



Type-species: T. herdmani Walker, 1906b; 1907 (monotypy). See 

 Schellenberg, 1931. 



Species: 3, subantarctic, littoral. 



Vitjazianidae 



Figure 172 



Diagnosis. — ^Accessory flagellum long, composed of a few long 

 articles; base of primary flagellum conjoint; gnathopod 1 simple, 

 gnathopods feeble, anterior members intersimilar; coxae short. See 

 Synopiidae, Astyridae, Eiisiridae, Liljeborgiidae, Hyperiopsidae, 

 Melphidippidae, Argissidae. 



Description. — Accessory flagellum long, composed of only a few 

 articles; base of primary flagellum of antenna 1 conjoint, forming an 

 article nearly as long as peduncle; body smooth except for slight 

 carinations on urosome; rostrum slightly developed; coxae very short 

 to medium in length, scarcely touching; upper lip minutely incised; 

 lower lip with or without inner lobes; mouthparts otherwise basic; 

 gnathopods feeble, gnathopod 1 simple, gnathopod 2 simple or sub- 

 chelate; uropods biramous; telson short, cleft. 



Relationship.^ — The Hyperiopsidae differ from Vitjazianidae by 

 the bent first maxillary palps, the poorly toothed primary cutting- 

 edge and small molar of the mandible and the elongate fourth articles 

 of pereopods 1 and 2. 



The Eusiridae have an elongate peduncle of antenna 1 and usually 

 large subchelate gnathopods. Liljeborgiidae have large subchelate 

 gnathopods. 



The Melphidippidae have an elongate uropod 3, and an elongate 

 l^eduncle of antenna 1. 



The Astyridae have a 1-articulate accessory flagellum, a reduced 

 mandibular molar, and gaping lower lip. 



The Stilipedidae lack an accessory flagellum, have foliaceous first 

 maxillae, short gnathopods, and no mandibular molar. 



Figure 172. — Vitjazianidae: a, Vitjaziana gurjanovae Birstein and Vinogradov (1955); 

 b, Vemana compressa J. L. Barnard (1964a). Lower lip: c, Vemana; d, Vitjaziana. 

 Telson: e, Vitjaziana. Maxilla 1:/, Vitjaziana; g, Vemana. Antenna 1, basal portion: 

 h, Vitjaziana. Maxilliped : i, Vitjaziana. Uropod 3: j, Vemana. Mandible: k, Vit- 

 jaziana; I, Vemana. Upper lip: m, Vitjaziana. Gnathopod 1: n, Vitjaziana; o, Vemana. 

 Gnathopod 2: p, Vitjaziana; q, Vemana. Maxilla 2: r, Vitjaziana. 



