Comprehensive DescriptionRead full entry
MATERIAL EXAMINED. — South Africa. S.S. "Pieter Faure": stn 153, Buffalo River, NW 1/2W, 19 miles, 549 m: 1 ov. ♀ 6.3 mm (SAM A1524).
Australia. Queensland. MV "Iron Summer": shot 1-7, off Moreton Island, 27°13'S, 153°00'E, 500-540 m, 2-3.10.1982: 1 ov. ♀ 8.2 mm (QM W16517); shot 2, 27°19'9"S, 153°53'47"E, 600 m, 10.05.1983: 1 ♂ 15.2 mm (QM W14337); shot 3, 27°12'83"S, 153°52'87"E, [no depth recorded], 10.05.1983: 1 ♂ 12.1 mm (QM W14333).
New South Wales. FRV "Kapala": stn K77-23-10, 33°11'S, 152°24'E, 732 m, 7.12.1977: 5 ♂ 8.5-12.1 mm (AM P52735). — RV "Tangaroa": NZOI stn U219, 32°59'S, 152°33.5'E, 381-444 m, 9.10.1982, colls. W. PONDER & R. SPRINGTHORPE: 1 ♀ 3.9 mm (AM P40417).
Great Australian Bight. "Endeavour" EXPEDITION 1909-14: S of Eucla, 33°30'S, 129°28'E, 823 m: 1 ♂ 13.1 mm (AM P52736).
Southwestern Indian Ocean. South Africa. "Galathea": stn 197, off Durban, 29°57'S, 31°26'E, 495 m, 14.02. . 1951: 3 ♂ 4.2-7.0 mm, 1 ♀ 7.8 mm (ZMK). .
Southeastern Atlantic. Angola. "Galathea": stn 101, 8°50'S, 12°32E, 990 m, 12.12.1950: 1 ♂ 6.7 mm (ZMK). South Africa. "Pickle": stn 1483, off Cape Peninsula, 34°06'S, 17°53'E, 247 m, 13.12.1929: 2 ♂ 12.0, 12.2 mm (ZMK).
TYPES. — Lectotype: ov. ♀ 6.3 mm (selected by LEMAITRE, 1990: 223), South Africa, S.S. "Pieter Faure", stn 153, Buffalo River, NW 1/2W, 19 miles, 549 m (SAM A1524).
DIAGNOSIS. - Shield about as broad as long, dorsal surface well calcified or weakly calcified medially; lateral projections broadly rounded. Rostrum broadly subtriangular, rounded distally; with short mid-dorsal ridge. Ocular peduncles more than half length of shield, weakly inflated basally; width of cornea about same or slightly more than distal width of ocular peduncle. Ocular acicles subtriangular, terminating in strong simple spine (rarely bifid). Antennular peduncle exceeding distal margin of cornea by half length of penultimate segment; lateral face of basal segment with statocyst lobe having subrectangular distal lobe armed with 1 or 2 spines, and 1 spine proximally. Antennal peduncle exceeding distal margin of cornea by at most half length of fifth segment; flagellum with setae 1 to 2 flagellar articles in length; acicle weakly curved in dorsal view, exceeding distal margin of cornea by at most half length of acicle, mesial margin armed with 5 to 10 small spines. Epistomial spine usually present. Sternite of third maxillipeds with strong spine on each side of midline. Left cheliped well calcified, densely setose; carpus with irregular rows of small spines on dorsal margin. Ambulatory legs with meri, carpi and propodi unarmed except for small dorsodistal spine on each carpus; meri each about 3.5 (first leg) or 2.9 (second leg) times as long as high, with lateral and mesial faces weakly calcified medially (weak calcification more pronounced on second leg). Anterior lobe of sternite of second ambulatory legs subsemicircular, setose, armed with small subdistal spine. Fourth pereopod with propodal rasp consisting of 2 or 3 rows of conical scales. Fifth pereopod with propodal rasp less than half length of propodus. Telson and uropods asymmetrical. Terminal margin of telson divided into 2 rounded projections by shallow, rounded (U-shaped) cleft; rounded projections armed distally with alternating short and long corneous spines (approximately 15 to 20 left, 10 to 17 right). Left exopod of uropod elongate, about 3.0 times as long as broad; with broad rasp.
SIZE RANGE. - Males, SL 4.0 to 15.2 mm. Females 3.9 to 11.0 mm. Ovigerous females 6.3 to 12.2 mm.
COLOR (from BARNARD, 1950: 451, as Parapagurus pilosimanus). —"Body pinkish, basal joints of chelipeds with reddish patches, 2nd and 3rd legs red, with a conspicuous white band along the upper and lower margins, cornea dark crimson, antenna 1 pink with white band along upper margin of last peduncular joint, antenna 2 pink."
VARIATIONS. - The weakly calcified area on the lateral and mesial faces of the meri of the ambulatory legs usually can be recognized by a dark, brownish coloration. The area is often slender, and occasionally is absent on the first leg.
HABITAT. - Usually found living in shelters formed by zoanthid species, probably Epizoanthus sp.
DISTRIBUTION - Southeastern Atlantic and southwestern Indian Ocean: off Angola to South Africa, and northward to off Natal. Western Pacific: Australia. Depth: 247 to 990 m.
REMARKS. - This species can be distinguished from all others in the genus by the weak calcification (usually marked by a dark, brown area) present on the lateral and mesial faces of the meri of the ambulatory legs, and the greater development of the ocular peduncles. In P. bouvieri, the length of the ocular peduncles (including corneae) is distinctly more than half the length of the shield, whereas in all other species of Parapagurus the ocular peduncles are half or less than half the length of the shield. The reduction of the ocular peduncles in P. bouvieri has not been as strong as in other species of the genus, and is a condition that can perhaps be attributed to the relatively shallower depth range at which this species lives compared to other species in the genus (Fig. 47). In other crustaceans, a reduction of eyes with increasing depth has also been documented (e.g., MENZIES et al., 1973; MARSHALL, 1979), and is an evolutionary trend that evidently has occurred independently in many groups.