3.9 Hyperiella dilatata Stebbing, 1888
Hyperiella dilatata Stebbing, 1888: p. 1403, pl.
171 - Bovallius, 1889: p. 247- Barnard, 1932: p.
274, fig. 161 - Hurley, 1969: p. 33 - Bowman,
1973: p. 27, figs. 20a-m, 21a-f - WeigmannHaass, 1989: p. 184, figs. 34-43, p. 181 (key).
Body length -
immature male: 4.1 mm (1 specimen)
Male. Both Al and A2 with multisegmented flagellum. lst pereopod with subchela; 2nd pereopod with cheia. 5th pereopod much longer than
6th and 7th. Epimeral plates of pleon with pointed postero-lateral corners. 3rd uropod with exopod 2/3 as wide as endopod.
Family Hyperiidae
Remarks
Bowman ( 1973) maintains that the diagnostic
key proposed by Bovallius (1889) to distinguish
H. dilatata from H. antarctica is based on characters that are poorly reliable. More recently,
Weigmann-Haass (1989) provided a key to identify 3 Antarctic species, H. antarctica Bovallius
1887, H. dilatata Stebbing 1888 and H. macronix
(Walker, 1906). This key allows the easy identification of H. dilatata from the two other congeneric species.
Distribution
Bowman (1973) reports the Indian sector of the
Antarctic (63°30'S, 88°57'E) as the type locality
of H. dilatata, but the species has also been sampled in the Ross Sea. More recently, WeigmannHaass (1989) considers the species as circumpolar in the Antarctic Ocean. In the Straits of Magellan, it was found only at St. 5, at the mouth of
the Pacific entrance, where it was sampled from
50-100 m.
Hyperiella dilatata Stebbing, 1888: p. 1403, pl.
171 - Bovallius, 1889: p. 247- Barnard, 1932: p.
274, fig. 161 - Hurley, 1969: p. 33 - Bowman,
1973: p. 27, figs. 20a-m, 21a-f - WeigmannHaass, 1989: p. 184, figs. 34-43, p. 181 (key).
Body length -
immature male: 4.1 mm (1 specimen)
Male. Both Al and A2 with multisegmented flagellum. lst pereopod with subchela; 2nd pereopod with cheia. 5th pereopod much longer than
6th and 7th. Epimeral plates of pleon with pointed postero-lateral corners. 3rd uropod with exopod 2/3 as wide as endopod.
Family Hyperiidae
Remarks
Bowman ( 1973) maintains that the diagnostic
key proposed by Bovallius (1889) to distinguish
H. dilatata from H. antarctica is based on characters that are poorly reliable. More recently,
Weigmann-Haass (1989) provided a key to identify 3 Antarctic species, H. antarctica Bovallius
1887, H. dilatata Stebbing 1888 and H. macronix
(Walker, 1906). This key allows the easy identification of H. dilatata from the two other congeneric species.
Distribution
Bowman (1973) reports the Indian sector of the
Antarctic (63°30'S, 88°57'E) as the type locality
of H. dilatata, but the species has also been sampled in the Ross Sea. More recently, WeigmannHaass (1989) considers the species as circumpolar in the Antarctic Ocean. In the Straits of Magellan, it was found only at St. 5, at the mouth of
the Pacific entrance, where it was sampled from
50-100 m.