226
Systematic Account
3.42 Lubbockia minuta
Wolfenden 1905
Lubbockia minuta Wolfenden, 1905: p. 15 -
Heron and Damkaer, 1978: p. 19, figs. 13,
14,15.
Lubbockia glacialis Heron and Damkaer,
1969: p. 16, figs. 20, 21 - Boxshall, 1977:
p. 118, fig. 8.
Body length -
female: 1.30mm (1 specimen)
males: 1.90-1.98mm (7 specimens)
Female. Prosome 2.8 times longer than
wide, 1.2 times longer than urosome. Posterolateral corners of last thoracic somite
rounded. Proportional lengths of urosomites
and furca 15:25:17:20:10:13 = 100. Area
of external genital apparatus located anterior
to ~id-Iength of somite. Maxilliped with
termInal segment resembling sharply pointed
claw. P1-P2 Re3 with three short outer
lanceolated spines. P5 with slender segment
not reaching area of external genital
apparatus; two terminal spines, the inner
long~r and reaching mid-length of genital
somIte.
Male. Urosome 1.5 longer than prosome.
Postero-Iateral corners of last thoracic somite
rounded. Proportional lengths of urosomites
and furca 9:12:16:19:29:5:10 = 100.
Swimming legs as in female. P5 with inner
spine about twice as long as external spine.
Remarks
L. minuta closely resembles L. glacialis.
Males can be mainly distinguished for the
leng~hs of the third postgenit.al somite, anal
somIte, caudal ramus and spInes of P5 (see
figures of L. glacialis male in Heron et al.
1984). In the P5 of L. glacialis, the external
sp~ne is 114 ~he length of the internal spine;
thIS latter spIne extends beyond the posterior
margin of the postgenital somite. Among our
L. minuta specimens, we recorded only one
adult female, which was heavily damaged.
Distribution
The species has been reported for the NE
Atlantic (Wolfenden 1905), tropical Atlantic
and NE Pacific (Heron and Damkaer 1978)
Oceans. To our knowledge, L. minuta
has never been reported in Argentinian or
Chilean waters. In the present study, it was
sampled from 400-500 m at one Pacific
station in the Straits of Magellan and from
100-150 m at the entrance to Baia Inutil.