SYSTEM ATICS AND PHYLOGENY OF ZAUSODES 



91 



former Zausodes complex displays such kind of sexual dimorphism, 

 we regard this observation as extremely doubtful. The first exopod 

 segment of legs 2-A often has an inner tuft or row of long setules 

 which can easily be misinterpreted as a small seta. The species is 

 placed in Neozausodes on the same grounds as for the previous one. 



Neozausodes stammeri (Jakobi, 1954) comb. nov. 



TYPE locality. Brazil, Parana State; Baia de Paranagua, Ilha do 

 Mel, Mar de Dentro. 



Note. 



This is the most completely described of Jakobi's (1954) species. 



There is, however, no doubt that this species requires redescription 



before it can be unambiguously identified. Given the limited detail 



in the illustrations, the differences between N. limigenus and N. 



stammeri are not impressive, raising the suspicion that both are 



conspecific. 



Neozausodes sextus (Lang, 1965) comb. nov. 



TYPE LOCALITY. California, Monterey Bay, off Hopkins Marine 

 Station; sand at about 7 m depth. 



Neozausodes shulenbergeri sp. nov. 



Synonymy. Zausodes cf. arenicolus sensu Ravenel & Thistle 

 ( 1 98 1 ) [ecology]. Zausodes arenicolus sensu Varon & Thistle ( 1 988 ) 

 [ecology]. 



Type locality. Gulf of Mexico: 29°5 1 'N, 84°3 1 "W (about 50 m 

 north of day mark #2), St. George Sound, Florida, 5 m depth, 

 unvegetated medium sand (median grain size = 0.254 mm); a 

 seagrass meadow occurs about 1 50 m to the north; see Foy & Thistle 

 (1991 ) for additional description. 



Material examined. 



The Natural History Museum: holotype9in alcohol (BMNH 

 1999. 192); allotypic paratypecfin alcohol (BMNH 1999. 193); other 

 paratypesare 1 9 methanol (BMNH 1999. 194) and 2 9 9and2cfcfon 

 slides (BMNH 1999.195-198). 



National Museum of Natural History (Smithsonian Institution. 

 Washington, D.C.): additional paratypes represented by 2 9 9 and 

 lcfin alcohol (USNM 288448-449) and 29 9 and 2a"cfon slides 

 (USNM 288447). 



Description. All illustrations are from paratypes except Figs 

 13C-D which are from the holotype. 



Female. Body length: measured from anterior margin of rostrum 

 to posterior margin of caudal rami: 443 urn (x = 451 urn, n = 4): 

 without rostrum and caudal rami: 411 urn (x = 419 um, n = 4). Body 

 (Figs 13C-D, 16A,C) dorsoventrally flattened. Greatest width: 

 193 um (x = 196 um, n - 4) near posterior margin of cephalosome. 

 Naupliar eye distinct; reddish brown in fresh, unstained specimens; 

 invisible in cleared specimens. Integument with surface ornamenta- 

 tion/sculpturing consisting of irregular pattern of fine striations and 

 cephalothorax pitted (not illustrated). Sensillae present dorsally and 

 dorsolateral^ on cephalothorax and body somites except penulti- 

 mate one (not all shown). Ventrolateral margin of cephalic shield 

 with sensillae. Epimera of thoracic somites thickly chitinized later- 

 ally. Third thoracic somite and urosomites 1-5 with fine spinular 

 rows dorsally and dorsolaterally; penultimate and antepenultimate 

 somites with ventral spinular row (Fig. 16C); anal somite with 

 spinular rows dorsally, ventrally, and laterally on the posterior 

 margin (Fig. 16A,C). Lateral margins of free thoracic somites with 



2 sensillae. Ventral posterolateral corners of urosomites 2-5 and 

 lateral margins of urosomites 1-4 with spinules. Genital double- 

 somite with continuous chitinous internal rib ventrolaterally and 

 ventrally (but not dorsally). Anal somite cleft medially; anus located 

 terminally, triradiate, bordered by incised frill that is partially ex- 

 posed in dorsal aspect; with ventral pore near posterior margin; anal 

 operculum and pseudoperculum present. Caudal rami (Figs 13C-D, 

 1 6A,C) approximately as long as wide, with 7 setae: setae I — III bare, 

 setae IV-V bipinnate, seta VI bipinnate, dorsal seta (VII) carried on 

 a biarticulate socle. Gelatinous string (Figs 16A,C) extending 

 posteriorly from each caudal ramus present in some specimens. 



Rostrum (Fig. 1 3 A) prominent, bell-shaped, defined at base; with 

 two short sensillae anteriorly and one sensilla on each mediolateral 

 margin; with middorsal pore. 



Antennule (Figs 14A-B) 7-segmented; segments 1 and 2 longest; 

 first segment widest with several spinular rows; segment 4 with 

 aesthetasc (35 um long); segment 7 with acrothek consisting of 3 

 elements (probably 2 setae and 1 aesthetasc, however, we were 

 unable to distinguish which elements were setae and which was an 

 aesthetasc); with setal formula 1-[1], 2— [10], 3-[7 + 2 unipinnate], 

 4-[3 + 1 unipinnate + (1 + ae)], 5-[l + 1 unipinnate], 6-[6 + 2 

 pinnate], 7-[5 + acrothek]. 



Antenna (Fig. 1 3B). Coxa short and unornamented; allobasis with 

 spinular row, abexopodal spinulose seta, and cuticular thinning 

 marking original segmentation of basis and first endopodal segment; 

 free endopod 1 -segmented; lateral armature consisting of a pinnate 

 spine. 1 long and 1 short seta; distal armature comprising 1 seta, 1 

 pinnate curved spine, and 4 geniculate spines, longest one of which 

 bearing spinules proximal to geniculation and fused at base to a 

 slender seta; with spinular rows and hyaline surface frill as indicated 

 in Fig. 13B: exopod 1 -segmented with 1 lateral short seta and 1 distal 

 bipinnate seta. 



Labrum well developed, not medially incised. 



Mandible (Fig. 14E). Gnathobase with pinnate seta at dorsal 

 corner; coxa with proximal row of spinules; palp biramous, com- 

 prising basis and 1 -segmented exopod and endopod; basis produced 

 transversely, with proximal spinular row and 4 bipinnate setae; 

 endopod longer than exopod, with 1 bare and 1 pinnate lateral setae 

 and 6 apical setae; exopod with 1 pinnate and 2 bare lateral setae, 1 

 pinnate and 2 bare distal setae, and subdistal spinular row. 



Maxillule (Fig. 14D). Praecoxa with spinular row along outer 

 edge and with arthrite bearing 8 spines around distal margin, 2 

 anterior surface setae, and posterior spinular row; coxal endite with 

 4 setae and a spinular row; basal endite with 6 setae; endopod with 



1 bare and 2 pinnate setae distally; exopod with 1 pinnate inner seta, 



2 pinnate and 1 bare distal setae. 



Maxilla (Fig. 14C). Syncoxa with spinular row along outer mar- 

 gin and 3 endites; praecoxal endite with 3 pinnate setae; coxal 

 endites each with 2 bare setae and 1 pinnate seta; allobasis with claw 

 and 3 bare setae; endopod 1 -segmented with 4 bare setae. 



Maxilliped (Fig. 14F). Syncoxa with a bipinnate seta and numer- 

 ous spinular rows as indicated in Fig. 14F; basis with a spinular row 

 and seta along palmar margin, with spinules along outer distal 

 margin and on anterior face; endopod represented by acutely recurved 

 claw with spinules along inner margin and proximal accessory seta. 



PI (Fig. 15C). Rami prehensile; coxa with spinular rows along 

 outer margin and anterior face, with pore near inner distal corner; 

 basis with bipinnate seta subdistally at outer margin and bipinnate 

 spine at inner distal corner; spinular rows present along inner and 

 outer margins, anterior face, and around articulation with endopod; 

 with pore near outer seta. Exopod 3-segmented, 1 .2 times as long as 

 endopod (excluding apical elements); exp-1 with subdistal pinnate 

 seta and spinular rows along outer margin; exp-2 elongate, 2. 1 times 



