3.11 Hyperoche medusarum Kroyer, 1838
Metoecus medusarium Kroyer, 1838: p. 288.
Hyperoche kroeyeri Bovallius, 1889: pp. 87-92.
Hyperoche medusarum Barnard, 1930: p. 415
(key)- Hurley, 1955: p. 144, figs. 96-114.
Body length -
females: 4.5-8.5 mm ( 4 specimens)
males: 3.4-6.2 mm (2 specimens)
Female. A 1 and A2 bearing !-articulate flagellum. Incisor of left mandible consisting in two
processes bearing small distal teeth; molar process triangular and turned inwards. Incisor of
right mandible with one process bearing small
distal teeth. Inner lobe of 1st maxilla oval and
encircled by setules; outer plate lamellar with inner margin ornated by short setules and distally
bearing minute teeth. Outer plates of maxilliped
oval with convex outer margins and rounded
apex; median lobe with oval plate, surface of
which bears fine setules. Pl and P2 with distal
chelae. Epimeral plates with slightly convex posterior margin; postero-distal corners acute. A
fine and distally serrated suture forms an arc
from the postero-distal corner of each plate to
the antero-proximal.
Male. General form as in female, but more slender. Al and A2 much longer than in female. Pl
and P2 with narrow carpus.
Remarks
The species can be easily distinguished from the
congeneric species H. mediterranea due to the
rounded apex of the outer lobes of the maxilliped and the epimeral plates with postero-distal
corners protruding into a small point.
Distribution
Hurley (1955) reports the following sampling locations: N. Atlantic and adjacent seas, north of
Alaska, South Georgia and New Zealand. Bowman et al. ( 1963) gives its presence also in the
NW Atlantic, Chesapeake Bay. More recently,
Raymont (1983) describes the species as borealarctic and as present in cold waters of both
oceans. In the Straits of Magellan, the species
was not sampled in the Atlantic sector, whereas
it was common in the Central area, from Cape
Froward to Paso Ancho. Its vertical distribution
range in Central waters was from 150 m to the
bottom.
Metoecus medusarium Kroyer, 1838: p. 288.
Hyperoche kroeyeri Bovallius, 1889: pp. 87-92.
Hyperoche medusarum Barnard, 1930: p. 415
(key)- Hurley, 1955: p. 144, figs. 96-114.
Body length -
females: 4.5-8.5 mm ( 4 specimens)
males: 3.4-6.2 mm (2 specimens)
Female. A 1 and A2 bearing !-articulate flagellum. Incisor of left mandible consisting in two
processes bearing small distal teeth; molar process triangular and turned inwards. Incisor of
right mandible with one process bearing small
distal teeth. Inner lobe of 1st maxilla oval and
encircled by setules; outer plate lamellar with inner margin ornated by short setules and distally
bearing minute teeth. Outer plates of maxilliped
oval with convex outer margins and rounded
apex; median lobe with oval plate, surface of
which bears fine setules. Pl and P2 with distal
chelae. Epimeral plates with slightly convex posterior margin; postero-distal corners acute. A
fine and distally serrated suture forms an arc
from the postero-distal corner of each plate to
the antero-proximal.
Male. General form as in female, but more slender. Al and A2 much longer than in female. Pl
and P2 with narrow carpus.
Remarks
The species can be easily distinguished from the
congeneric species H. mediterranea due to the
rounded apex of the outer lobes of the maxilliped and the epimeral plates with postero-distal
corners protruding into a small point.
Distribution
Hurley (1955) reports the following sampling locations: N. Atlantic and adjacent seas, north of
Alaska, South Georgia and New Zealand. Bowman et al. ( 1963) gives its presence also in the
NW Atlantic, Chesapeake Bay. More recently,
Raymont (1983) describes the species as borealarctic and as present in cold waters of both
oceans. In the Straits of Magellan, the species
was not sampled in the Atlantic sector, whereas
it was common in the Central area, from Cape
Froward to Paso Ancho. Its vertical distribution
range in Central waters was from 150 m to the
bottom.