218
la.
Peduncle of distal outgrowth short, with
ratios: 0.12> pd/sl (> 0.05), 1.1 > pdlbj (> 0.67),
aj/pd > 0.83 (up to 2.1) (e.g. Fig. 3 A) ........ 2
1 b. Peduncle of distal outgrowth of intermediate
length, with ratios: 0.15 > pdlsl > 0.085, 1.5 >
pd/bj > 0.94, ajlpd > 0.50 (up to 1.45) (e.g. Fig. 3
B) ........................................ 5
1c.
Peduncle of distal outgrowth long, with
ratios: pd/sl > 0.16 (up to 0.35), pdlbj > 1.38 (up
to 3.0), 0.87 > aj/pd (>0.4) (e.g. Fig. 3 C) ..... 6
2a. No spur on thumb; ovaries uniramous dendyi
group ..................................... 3
2b. Spur on thumb ....................... 4
3a. No tooth on finger; frontal appendage simple
and short .................... dendyi subgroup
3b. Tooth on finger; frontal appendage rameous
and well developed ......... bouvieri subgroup
4a. Dorsal side of distal part of finger spinulated;
lateral lamella without denticles between thumb
and spur. Inner lamella not anteromedially produced; genitalia without linguiform outgrowths;
ovaries uniramous; cysts tetrahedral .. sudanicus
group
4b. Dorsal side of distal part of finger not spinulated; lateral lamella with 2 or more denticles
between thumb and spur; inner lamella anteromedially produced; peduncle with pulvinus; genitalia without linguiform outgrowths; ovaries un iramous; cysts sphaerical ............... vitreus
group
Sa.
Rotation of hand no more than 40°; inner
side of proximal part of peduncle without protuberances; peduncle with pulvinus; ovaries uniramous
sealii group
5b.
Rotation of hand c. 50°; inner side of
proximal part of peduncle with conical protuberances; peduncle with pulvinus; genitalia without
linguiform outgrowths; ovaries uniramous . cafer
group
6a.
Proximal part of finger with a dorsolateral
sickleshaped ramus; distal part of finger with a row
of dorsal spines; proximal part of finger without
a ventral protuberance; spur of thumb well developed; peduncle without pulvinus; genitalia with
a pair of linguiform outgrowths; male cercopods
setose; ovaries uniramous .... dichotomus group
6b. Proximal part of finger without a dorsolateral
sickle-shaped ramus; distal part of finger without
a row of dorsal spines ...................... 7
7 a. Proximal part of finger with a ventral protuberance; spur of thumb not well developed; ovaries
uniramous ..................... gracilis group
7b.
Proximal part of finger without a ventral
protuberance; spur of thumb well developed .. 8
8a.
Distal part of finger truncated; male cercopods spinose-denticulate; ovaries uniramous ..
cirratus group
8b.
Distal part of finger not truncated; male
cercopods setose ........... torvicornis group 9
9a.
Frontal appendage spinose and well developed; genitalia without linguiform outgrowths;
ovaries uniramous ...... proboscideus subgroup
9b. Frontal appendage simple and short; peduncle without pulvinus ....................... 10
lOa. Ovaries uniramous . torvicornis subgroup
lOb.
Ovaries biramous; genitalia without linguiform outgrowths .................. mackini
subgroup
The shape of the basal-dorsal part of the thumb is
an auxiliary character used to aid in assigning species
to the different species groups. Thus, for example, in
the vitreus group, the dorsal side of the basal part of
the thumb is strongly curved, while in the torvicornis
group it is longer and slightly curved (Fig. 6).
Species of the dendyi group
dendyi subgroup
Distribution. Africa and North America.
Streptocephalus dendyi Barnard, 1929
Material examined. BMNH 1932.2.25.61-64, Rondebosch, Cape Town, South Africa 2dJ15.1, 16.3 mm,
and 1 <¥ 18.8 mm; DB977 South Africa 2<.f><¥c. 15 mm.
Remarks. In males examined, the pulvinus is
absent. The large male has only one complete cercopod, which bears spines on its distal part. The other
two males have only setose cercopods. Probably these
specimens are not fully grown. However, a variation
of the structures of the cercopods has been reported by
Barnard (1929), and Hamer et al. (1994a).
Streptocephalus kargesi Spicer, 1985
Material examined. USNM 204932, EI Encinal, c.
7 mi S of Lake Catemaco, Veracruz, Mexico, paratypes
la.
Peduncle of distal outgrowth short, with
ratios: 0.12> pd/sl (> 0.05), 1.1 > pdlbj (> 0.67),
aj/pd > 0.83 (up to 2.1) (e.g. Fig. 3 A) ........ 2
1 b. Peduncle of distal outgrowth of intermediate
length, with ratios: 0.15 > pdlsl > 0.085, 1.5 >
pd/bj > 0.94, ajlpd > 0.50 (up to 1.45) (e.g. Fig. 3
B) ........................................ 5
1c.
Peduncle of distal outgrowth long, with
ratios: pd/sl > 0.16 (up to 0.35), pdlbj > 1.38 (up
to 3.0), 0.87 > aj/pd (>0.4) (e.g. Fig. 3 C) ..... 6
2a. No spur on thumb; ovaries uniramous dendyi
group ..................................... 3
2b. Spur on thumb ....................... 4
3a. No tooth on finger; frontal appendage simple
and short .................... dendyi subgroup
3b. Tooth on finger; frontal appendage rameous
and well developed ......... bouvieri subgroup
4a. Dorsal side of distal part of finger spinulated;
lateral lamella without denticles between thumb
and spur. Inner lamella not anteromedially produced; genitalia without linguiform outgrowths;
ovaries uniramous; cysts tetrahedral .. sudanicus
group
4b. Dorsal side of distal part of finger not spinulated; lateral lamella with 2 or more denticles
between thumb and spur; inner lamella anteromedially produced; peduncle with pulvinus; genitalia without linguiform outgrowths; ovaries un iramous; cysts sphaerical ............... vitreus
group
Sa.
Rotation of hand no more than 40°; inner
side of proximal part of peduncle without protuberances; peduncle with pulvinus; ovaries uniramous
sealii group
5b.
Rotation of hand c. 50°; inner side of
proximal part of peduncle with conical protuberances; peduncle with pulvinus; genitalia without
linguiform outgrowths; ovaries uniramous . cafer
group
6a.
Proximal part of finger with a dorsolateral
sickleshaped ramus; distal part of finger with a row
of dorsal spines; proximal part of finger without
a ventral protuberance; spur of thumb well developed; peduncle without pulvinus; genitalia with
a pair of linguiform outgrowths; male cercopods
setose; ovaries uniramous .... dichotomus group
6b. Proximal part of finger without a dorsolateral
sickle-shaped ramus; distal part of finger without
a row of dorsal spines ...................... 7
7 a. Proximal part of finger with a ventral protuberance; spur of thumb not well developed; ovaries
uniramous ..................... gracilis group
7b.
Proximal part of finger without a ventral
protuberance; spur of thumb well developed .. 8
8a.
Distal part of finger truncated; male cercopods spinose-denticulate; ovaries uniramous ..
cirratus group
8b.
Distal part of finger not truncated; male
cercopods setose ........... torvicornis group 9
9a.
Frontal appendage spinose and well developed; genitalia without linguiform outgrowths;
ovaries uniramous ...... proboscideus subgroup
9b. Frontal appendage simple and short; peduncle without pulvinus ....................... 10
lOa. Ovaries uniramous . torvicornis subgroup
lOb.
Ovaries biramous; genitalia without linguiform outgrowths .................. mackini
subgroup
The shape of the basal-dorsal part of the thumb is
an auxiliary character used to aid in assigning species
to the different species groups. Thus, for example, in
the vitreus group, the dorsal side of the basal part of
the thumb is strongly curved, while in the torvicornis
group it is longer and slightly curved (Fig. 6).
Species of the dendyi group
dendyi subgroup
Distribution. Africa and North America.
Streptocephalus dendyi Barnard, 1929
Material examined. BMNH 1932.2.25.61-64, Rondebosch, Cape Town, South Africa 2dJ15.1, 16.3 mm,
and 1 <¥ 18.8 mm; DB977 South Africa 2<.f><¥c. 15 mm.
Remarks. In males examined, the pulvinus is
absent. The large male has only one complete cercopod, which bears spines on its distal part. The other
two males have only setose cercopods. Probably these
specimens are not fully grown. However, a variation
of the structures of the cercopods has been reported by
Barnard (1929), and Hamer et al. (1994a).
Streptocephalus kargesi Spicer, 1985
Material examined. USNM 204932, EI Encinal, c.
7 mi S of Lake Catemaco, Veracruz, Mexico, paratypes