Alpheus acutocarinatus De Man 1909

Alpheus acutocarinatus De Man, 1909

Alpheus acutocarinatus De Man, 1909a:104 [type locality: the type series came from 4 Indonesian localities: Selat Madura (56 m); west coast of Lombok (18–27 m); north coast of Celebes (72 m); and east coast of Sumbawa (to 36 m)]; 1911:301, pl. 21: fig. 94–94f, pl. 22: fig. 94g–j.—A.H. and D.M. Banner, 1981:225.—D.M. and A.H. Banner, 1982:151, fig. 44.

DIAGNOSIS.—(Brevirostris Group). Body not unusually compressed or setose; rostrum prominent but not reaching as far as distal margin of 1st antennular segment, sharply carinate in midline, carina extending posteriorly beyond midlengh of carapace, base not abruptly delimited from adrostral furrows; carapace with median tooth interrupting postrostral carina on gastric region, without flattened teeth overhanging posterior ends of adrostral furrows, anterior margin transverse and unarmed mesial to orbital hoods, curving directly onto rostral margin, region not unusually flattened, orbital hoods unarmed, adrostral furrows deep; 2nd antennular segment more than 4 times as long a wide; basal antennal segment (basicerite) armed with small lateral tooth not nearly reaching level of tip of stylocerite; antennal scale with lateral margin moderately concave, distolateral spine not unusually stout, barely overreaching distal margin of blade; 1st pereopods with merus armed with acute distal tooth on inferior flexor margin; major chela oval in cross-section, 6 times as long as wide, dactyl nearly straight in longitudinal plane, not double-ended, bearing well-developed plunger, palm without teeth either side of dactylar articulation or other obvious sculpture, without longitudinal carina near margin proximal to fixed finger, without “saddle” proximal to adhesive plaque but with indistinct distal sinus adjacent to plaque, without shoulder on margin proximal to fixed finger; minor chela 9 times as long as wide, dactyl slender, slightly shorter than or subequal to palm, “balaeniceps” in male only, without longitudinal crests on opposable margin; 2nd pereopod with proximal carpal article subequal to 2nd; 3rd pereopod with dactyl pointed, simple, subspatulate, propodus, carpus, and merus without spines on flexor margin, ischium bearing movable spine; maximum carapace length to base of rostrum about 9.0 mm.

RANGE.—Madagascar, Gulf of Thailand, Philippines (off Manila Bay), Indonesia, and southern Queensland, Australia; about 20–72 meters. In the Smithsonian collections, there are six specimens of A. acutocarinatus collected by the NAGA Expedition in the Bay of Nha Trang, Viet Nam in 1966.

MATERIAL.—PHILIPPINES. Port Gubat, southeastern Luzon [12°55′N, 124°09′E]; tide pool; 23 Jun 1909 (1300–1700): 1 ovig female [7.3].

RANGE.—Andaman Sea, Gulf of Thailand, Philippines, Indonesia, and Queensland, Australia, to the Marshall, Fiji, Samoa, and Tonga islands; intertidal to 3 meters.

*5. Alpheus alcyone De Man, 1902

Alpheus crinitus.—Bate, 1888:548, pl. 98: fig. 2 [not A. crinitus Dana, 1852].

Alpheus alcyone De Man, 1902:870, pl. 27: fig. 61 [type locality: Ternate].—D.M. and A.H. Banner, 1982:110, fig. 29.

Alpheus aculeipes Coutière, 1905:892, pl. 79: fig. 31 [type locality: several localities in the Maldive Islands, as well as Djibouti and Mozambique].

DIAGNOSIS.—(Crinitus Group). Body neither unusually compressed nor densely setose; rostrum small, not reaching nearly as far as distal margin of 1st antennular segment, sharply carinate in extreme anterior part, carina becoming blunt posteriorly and disappearing on anterior gastric region, base not abruptly delimited from adrostral furrows; carapace without median tooth or tubercle posterior to base of rostrum and without flattened teeth overhanging posterior ends of adrostral furrows, anterior margin transverse and unarmed mesial to orbital hoods, region not flattened, orbital hoods unarmed, adrostral furrows rather deep; 2nd antennular segment less than twice as long as wide; basal antennal segment (basicerite) unarmed; antennal scale with lateral margin moderately concave, distolateral spine stout, far overreaching distal margin of rather narrow blade; major 1st cheliped with merus armed with acute distal tooth on inferior flexor margin; minor 1st cheliped with merus unarmed on flexor margin; major chela broadly oval in cross-section, about 2 times as long as wide, dactyl slightly curved in longitudinal plane, not double-ended, bearing short, truncated plunger, palm without obvious sculpture of any kind; minor chela 4 times as long as wide, dactyl not especially slender, nearly as long as palm, not “balaeniceps” and without carinae on either extensor or opposable margin; 2nd pereopod with proximal carpal article about as long as 2nd; 3rd pereopod with dactyl variably biunguiculate, sometimes obscurely so, propodus bearing 8 spines on flexor margin, carpus with 1–4 spines on flexor margin, merus with distal tooth and 3–12 spines on parallel carina of flexor margin; 4th pereopod with merus lacking teeth or spines on flexor margin; maximum carapace length to base of rostrum about 8 mm.

MATERIAL.—PHILIPPINES. Off Jolo Island, Sulu Archipelago: sta 5174; 6°03′45″N, 120°57′E; 37 m; coarse sand; 5 Mar 1908 (1551–1557); 9’ Johnston oyster dredge: 1 male [5.5]. Near Siasi, Sulu Archipelago: sta 5147; 5°41′40″N, 120°47′10″E; 38 m; coral sand, shells; 16 Feb 1908 (1127–1147); 12′ Agassiz beam trawl, mud bag: 1 male [4.0].

RANGE.—Red Sea and eastern Africa to Japan, Philippines, Indonesia, Australia, and Caroline, Marshall, Fiji, Samoa, and Tonga islands; intertidal to 71 meters, in coral and probably sponges.