TYPE MATERIAL OF STEGOCEPHALIDAE 
Bathystegocephalus globosus (Walker, 1909) 
(Figs 13-15) 
Stegocephalus globosus Walker 1909 
Stegocephaloides valdiviae Strauss ?1909 
Bathystegocephalus globosus Schellenberg, 1926 
Bathystegocephalus globosus Pirlot 1933 
Bathystegocephalus globosus Birstein & Vinogradov 1964 
MATERIAL EXAMINED. Syntypes, BMNH 1909.1.29.17-31 (15 
specimens: females and juveniles, 4.5—10mm) 
DISTRIBUTION. Indian Ocean. 
DESCRIPTION. Biology: pelagic. 
Rostrum absent. 
Antennae elongate. Antenna | shorter than antenna 2; flagellum 
6-articulate; accessory flagellum article 2 absent. Antenna 2 pedun- 
cle (articles 3-5) longer than flagellum; article 3 elongate, article 3 
and 4 geniculate; article 4 shorter than article 5. 
Epistome curved (convex) and smooth; epistomal plate (medial 
keel) produced into a large conspicuous medial keel. 
Mouthparts not elongate or pointed. 
Mandible incisor triangular; incisor toothed; left lacinia mobilis 
present, powerful, laterally expanded, not conical. 
Maxilla 1 palp 1-articulate, oval, apex reaching beyond outer 
plate; outer plate distally rectangular; ST in two parallel rows, first 
marginal and second submarginal, ST first row with 5 setae, ST 1 
ordinary (similar to ST 2-4), ST 1—5 with one setae absent, ST 6 

Fig. 14 Bathystegocephalus globosus, female (8mm) syntype. 

119 


Fig.15 Bathystegocephalus globosus, female (8mm) syntype. 
absent, gap between ST 5 and ST 7 present, ST A—D present and part 
of second row; inner plate with a weakly developed shoulder, setae 
pappopectinate. 
Maxilla 2 outer plate absent, inner plate setae row A covering the 
entire margin, appressed to row B, row A setae pappopectinate; row 
B setae proximally pappose, distally with cusps present; row C 
present; row D present, 1—3 long setae distally, with many small 
cusps distally. 
Maxilliped palp 4-articulate, article 2 distally unproduced, dacty- 
lus distally simple (pointed); inner plate without nodular setae; 
medial setae-row present, reduced, transverse, setae pectinate; distal 
setae-row present, reduced, setae simple; inner setae-row present, 
setae conspicuously large, cuspidate; outer plate outer setae-row 
present, marginal, setae attached normally, setae short and straight; 
inner setae-row present, well developed, setae long robust, slender, 
parallel to outer row but widely separated proximally; distal setae- 
group present, setae attached normally, long robust. 
Labrum very short; lobes symmetrical and reduced. 
Labium distally broad, oval. 
Coxal plates and basis of pereopods covered with very short 
setules. Coxae 1-3 contiguous. 
Pereopod 1| coxa deeper than basis; propodus subovate. 
Pereopod 2 general appearance like pereopod 1; ischium not 
elongate, ratio length:breadth not exceeding 1.5, ischium distal 
posterior margin with plumose setae; propodus subovate palm 
absent. 
Pereopod 4 coxa posteroventral lobe medium sized, not reaching 
the base of the 7th pereon segment; basis anterior margin without 
long setae, posterior margin with long setae, without plumose setae 
