TYPE MATERIAL OF STEGOCEPHALIDAE 
Oostegites on pereopods 2—5. Gills on pereopods 2-7. 
Pleonites 1—3 dorsally smooth. 
Urosome: articulation between urosome segments 2 and 3 absent. 
Uropod | peduncle longer than rami, outer ramus as long as inner. 
Uropod 2 peduncle longer than rami, outer ramus as long as inner. 
Uropod 3 peduncle longer than half the length of rami, outer ramus 
2-articulate, outer ramus as long as inner. 
Telson longer than broad, longer than peduncle uropod 3, cleft, 
apically pointed, no submarginal setae on apex of each lobe. 
MALE. Unknown. 
REMARKS. This species is distinguished from all other stego- 
cephalid species by the very peculiar dactylus on its maxilliped palp 
(see figure 27). 
Stegocephaloides calypsonis sp. nov. 
(Figs 29-30) 
MATERIAL EXAMINED. Holotype, female, 4 mm, BMNH 
1992:1483:17, 10°38'N 65°32'W, 1400m, Calypso exp 7". October 
1979. Paratypes, 18 specimens, BMNH 1992:1483:17 (details, as 
above). Additional material: BMNH 1992:1484:15, 11 specimens, 
10°31'N 64°45'W, 1300m, Calypso exp. 5" October 1979 
DISTRIBUTION. Known only from the type locality. 
DESCRIPTION. Biology: not pelagic, otherwise unknown. 
Rostrum very small. 
Antennae elongate. Antenna | longer than antenna 2; flagellum 6- 
articulate; accessory flagellum article 2 present. Antenna 2 peduncle 
(articles 3—5) longer than flagellum; article 3 
short, about as long as broad; article 4 shorter than 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 1-articulate, rectangular, apex not reaching beyond 
outer plate; outer plate distally rectangular; ST in a pseudocrown, 
ST first row with more than 6 setae (ST1—5 expanded, ST7), ST 1 
conspicuously enlarged, gap between ST 5 and ST 7 absent; 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 without or with 
a weakly developed shoulder, setae pappose. 
Maxilla 2 gaping and geniculate, outer plate setae with distal 
hooks present, distal cleft absent; inner plate setae row A cover- 
ing 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, ex- 
panded, row elongated towards and beyond row A, with many 
small cusps distally. 
Maxilliped palp 4-articulate, article 2 distally unproduced, dacty- 
lus distally simple (pointed); inner plate with 1 nodular setae; medial 
setae-row 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 and straight; inner setae-row present but 
strongly reduced, setae short and simple, proximally parallel to 
outer and distally transverse; distal setae-group present, setae at- 
tached in a deep hollow, setae short simple. 
Labrum elongate; lobes asymmetrical; right lobe not reduced; left 
lobe reduced. 
Labium distally narrowing. 
129 
Coxal plates and basis of pereopods smooth. Coxae 1-3 con- 
tiguous. 
Pereopod 1 coxa deeper than basis; propodus subovate. 
Pereopod 2 longer and thinner than pereopod 1; ischium elongate, 
ratio length:breadth exceeding 1.5, ischium distal posterior margin 
with plumose setae; propodus subrectangular, palm absent. 
Pereopod 4 coxa posteroventral lobe medium sized, not reaching 
the base of the 7 pereon segment; basis anterior margin without 
long setae, posterior margin with long setae present, no plumose 
setae on distal anterior and posterior margins; ischium without 
plumose setae on posterior distal margin. 
Pereopod 6 basis posteriorly unexpanded, without a row of long 
plumose setae. 
Pereopod 7 basis anterior margin straight, distally rounded, no 
medial row of setae. 
Oostegites on pereopods 2—S. Gills on pereopods 2-7. 
Pleonites 1—3 dorsally smooth. 
Urosome: articulation between urosome segments 2 and 3 absent. 
Uropod 1 peduncle longer than rami, outer ramus shorter than inner. 
Uropod 2 peduncle shorter than rami, outer ramus shorter than inner. 
Uropod 3 peduncle longer than half the length of rami, outer ramus 
2-articulate, outer ramus shorter than inner. 
Telson longer than broad, as long as peduncle uropod 3, cleft, 
apically rounded, no submarginal setae on apex of each lobe. 
MALE. Pereopod 2 propodus larger in males than in females. 
Urosome ordinary (similar to females). 
REMARKS. Stegocephaloides calypsonis is a rather small species, 
but with somewhat elongate appendages (antennae and pereopods). 
The arrangement of ST on maxilla | is similar to that found in S. 
christianiensis (Boeck, 1871), but the presence of a second article on 
outer ramus of uropod 3 and the rounded lower margin of coxa 4 
indicate some relationship with S. attingens (outer ramus articula- 
tion absent, but with rounded coxa), S. boxshalli (see below) and S. 
camoti (Barnard, 1967). 
ETYMOLOGY. Named after the French oceanographic vessel 
‘Calypso’ from which the material was sampled. Galan (in his 
unpublished 1984 Ph.D. thesis) originally used the name calypsae, 
but this is here emended to the grammatically more correct 
calypsonis. 
Stegocephaloides boxshalli sp. nov. 
(Figs 31-33) 
Stegocephaloides attingens K.H. Barnard 1932: 131 (1 out of 4 
specimens only) 
MATERIAL EXAMINED. 
20" of August 1903. 
Paratypes, SAM A43988, 3 specimens. Additional material: 
BMNH 1928.4.13.41-44, female ~7mm: Cape Point, South Africa, 
500-1000m. 
Holotype, SAM A43988, male, Cape Point 
DISTRIBUTION. Known only from Cape Point, South Africa. 
DESCRIPTION. Biology: not pelagic, otherwise unknown. 
Rostrum very small. 
Antennae short. Antenna | longer than antenna 2; flagellum 5- 
articulate; accessory flagellum, article 2 present. Antenna 2 peduncle 
(articles 3-5) as long as flagellum; article 3 short, about as long as 
broad; article 4 longer than article 5. 
Epistome curved (convex) and smooth; epistomal plate (medial 
keel) not produced. 
Mouthparts not elongate or pointed. 
