128 

Fig. 27 Stegocephaloides australis, female (7mm) cotype. 
DESCRIPTION. Biology: not pelagic, otherwise unknown. 
Rostrum very small. 
Antennae short. Antenna | equal to antenna 2; flagellum 5- 
articulate; accessory 
flagellum article 2 absent. Antenna 2 peduncle (articles 3-5) 
longer than flagellum; article 3 short, about as long as broad; article 
4 as long as article 5. 
Epistome curved (convex) and smooth; epistomal plate (medial 
keel) not produced. 
Mouthparts not elongate or pointed. 
Mandible incisor lateral; incisor toothed; left lacinia mobilis 
present, powerful, laterally expanded, not conical. 
Maxilla | palp l-articulate, rectangular, apex not reaching beyond 
outer plate; outer plate distally rectangular; ST in a pseudocrown, 
ST first row with 6 setae (ST1-5S, ST7), ST 1 conspicuously en- 
larged, gap between ST 5 and ST 7 present; ST A present, located 
distally and part of first row, ST B present, part of second row, ST C 
present, ST D absent; inner plate with a weakly developed shoulder, 
setae pappopectinate. 
Maxilla 2 gaping and geniculate, outer plate setae with distal 
hooks present, distal cleft absent; inner plate setae row A covering 
about two thirds of the margin, clearly separated from row B, row A 
setae pappopectinate; row B setae proximally pappose, distally with 
cusps present; row C present; row D present, expanded, row elon- 
gated towards and beyond row A, with many small cusps distally. 
Maxilliped palp 4-articulate, article 2 distal inner margin weakly 
produced, dactylus distally cleft with one pointed and one heavily 
setose part; inner plate with 2 nodular setae; medial setae-row 
J. BERGE, W. VADER AND A. GALAN 
present, reduced to one or two setae but differentiated from distal 
row, transverse, setae pectinate; distal setae-row present, setae 
simple; inner setae-row present, setae not conspicuously large; outer 
plate outer setae-row present, marginal, setae attached in a deep 
hollow, setae short, strongly curved upwards (hooks); inner setae- 
row present but strongly reduced, setae short simple and slender, 
proximally parallel to outer row and distally transverse; distal setae- 
group present, setae attached in a deep hollow, setae short simple. 
Labrum elongate; lobes asymmetrical, right lobe not reduced, left 
lobe reduced. 
Labium distally narrowing. 
Coxal plates and basis of pereopods smooth. Coxae 1—3 contigu- 
ous. 
Pereopod | coxa deeper than basis; propodus subrectangular. 
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 subrectangular, palm absent. 
Pereopod 4 coxa posteroventral lobe large, reaching about the 
base of the 7th pereon segment; basis anterior margin without long 
setae, posterior margin with long setae, plumose setae on distal 
anterior and posterior margins; ischium with plumose setae on 
posterior distal margin present. 
Pereopod 6 basis posteriorly expanded, expansion rudimentary, 
with a row of long plumose setae. 
Pereopod 7 basis anterior margin straight, distally rounded, with 
a medial row of short and robust setae. 

Fig. 28 Stegocephaloides australis, female (7mm) cotype. 
