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98 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21
was necessary for Inachoides microrhynchus to be present in great numbers, and at one station 420 specimens were taken.
Depth: 5-18 fathoms.
Size and sex: The 30 mm male holotype is the largest specimen on
record. The largest male and female in the Sechura Bay series are the
measured pair above. However, females carrying eggs were found which
measured no more than 5.6 mm in length. Sex was readily determinable
in the smallest specimens present, 4.4 mm males and 4.0 mm females.
Breeding: At the time of the 1935 Hancock expedition to Peru, mid-
January, approximately one-half of the females examined were with ova,
the proportions being 14 out of 28 in one series, 5 out of 11 in another,
and 4 out of 9 in a third. At the time of the 1938 expedition, February
10-15, 8 of. 11 females examined in one lot had the full complement of
eggs and the remainder gave evidence of having but recently shed them.
January and February are mid-summer months in the Southern
Hemisphere, corresponding to July and August in the Northern
Hemisphere.
Remarks: The northern limit of range of the species appears to be
Sechura Bay, although dredging in the Gulf of Guayaquil might extend
this somewhat. It is quite well established through specimens obtained by
the Velero III that the species of Inachoides occurring north of Punta
Santa Elena, Ecuador, is Inachoides laevis.
To one coming from California to Peru, the similarity between
Inachoides microrhynchus and Pyromaia tuberculata (Lockington) is
striking. It is therefore not surprising to find that the relationship is
more than superficial, extending to the orbits and to the dactyli of the
young (see Rathbun, 1925, p. 136), and, as here shown, to the male
pleopod (Plate E, fig. 9). Fortunately there is no overlap in the ranges
of the two species, permitting segregation on a geographical basis.
Although written more than a century ago, the lucid French description of the elder Milne Edwards, quoted above, bears critical judgment
by modern standards, and needs only to be supplemented as regards
cheliped and antennal article to be entirely acceptable.
Inachoides laevis Stimpson
Plate E, Fig. 6; Plate 6, Fig. 4
Inachoides laevis Stimpson, 1860b, p. 192. A. Milne Edwards, 1879,
p. 200. Rathbun, 1910, p. 570; 1925, p. 61, pi. 22, figs. 3-6 (part:
not synonymy, not text-fig. 17; Lower Californian and Panamanian
specimens only). Crane, 1937, p. 53. Garth, 1948, p. 22.
Object Description
Description
| Title | AHF-PUB-PE-21-01~110 |
| Format (imt) | image/tiff |
| Contributing entity | University of Southern California |
| Filename | AHF-PUB-PE-21-01~110.tiff |
| Full text | 98 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 21 was necessary for Inachoides microrhynchus to be present in great numbers, and at one station 420 specimens were taken. Depth: 5-18 fathoms. Size and sex: The 30 mm male holotype is the largest specimen on record. The largest male and female in the Sechura Bay series are the measured pair above. However, females carrying eggs were found which measured no more than 5.6 mm in length. Sex was readily determinable in the smallest specimens present, 4.4 mm males and 4.0 mm females. Breeding: At the time of the 1935 Hancock expedition to Peru, mid- January, approximately one-half of the females examined were with ova, the proportions being 14 out of 28 in one series, 5 out of 11 in another, and 4 out of 9 in a third. At the time of the 1938 expedition, February 10-15, 8 of. 11 females examined in one lot had the full complement of eggs and the remainder gave evidence of having but recently shed them. January and February are mid-summer months in the Southern Hemisphere, corresponding to July and August in the Northern Hemisphere. Remarks: The northern limit of range of the species appears to be Sechura Bay, although dredging in the Gulf of Guayaquil might extend this somewhat. It is quite well established through specimens obtained by the Velero III that the species of Inachoides occurring north of Punta Santa Elena, Ecuador, is Inachoides laevis. To one coming from California to Peru, the similarity between Inachoides microrhynchus and Pyromaia tuberculata (Lockington) is striking. It is therefore not surprising to find that the relationship is more than superficial, extending to the orbits and to the dactyli of the young (see Rathbun, 1925, p. 136), and, as here shown, to the male pleopod (Plate E, fig. 9). Fortunately there is no overlap in the ranges of the two species, permitting segregation on a geographical basis. Although written more than a century ago, the lucid French description of the elder Milne Edwards, quoted above, bears critical judgment by modern standards, and needs only to be supplemented as regards cheliped and antennal article to be entirely acceptable. Inachoides laevis Stimpson Plate E, Fig. 6; Plate 6, Fig. 4 Inachoides laevis Stimpson, 1860b, p. 192. A. Milne Edwards, 1879, p. 200. Rathbun, 1910, p. 570; 1925, p. 61, pi. 22, figs. 3-6 (part: not synonymy, not text-fig. 17; Lower Californian and Panamanian specimens only). Crane, 1937, p. 53. Garth, 1948, p. 22. |
| Archival file | hancockunpub_Volume32/AHF-PUB-PE-21-01~110.tiff |
