Alpheus euchirus Dana 1852

Alpheus euchirus Dana, 1852

Alpheus euchirus Dana, 1852a:21 [type locality: Balabac Strait]; 1852b:545, pl. 34: fig. 6.—D.M. and A.H. Banner, 1982:197.

DIAGNOSIS.—(Edwardsii Group). Body not unusually compressed or setose; rostrum acute, not overreaching distal margin of 1st antennular segment, dorsal carina not extending posteriorly beyond orbital hoods, base not abruptly delimited from adrostral furrows; carapace without flattened teeth overhanging posterior ends of adrostral furrows, orbital hood armed with small marginal spine; basal antennal segment (basicerite) with, at most, reduced lateral tooth; 1st pereopods with merus unarmed on inferior flexor margin; major chela somewhat compressed, about twice as long as wide, dactyl somewhat skewed from longitudinal plane of palm, not double-ended, palm with “saddle” proximal to adhesive plaque, proximal shoulder not overhanging “saddle,” strong, rounded shoulder on opposite margin proximal to fixed finger; minor chela with stout fingers; 2nd pereopod with 1st carpal article about twice as long as second; 3rd pereopod with dactyl pointed, simple, propodus with 7 or 8 sets of spines on flexor margin, merus with very small, inconspicuous distal tooth on flexor margin; carapace length about 7 mm.

RANGE.—Known only from the type locality in Balabac Strait, the southwestern passage between the Sulu Sea and the South China Sea.

MATERIAL.—PHILIPPINES. Babuyan Channel, north of Luzon: sta 5325; 18°34′15″N, 121°51′15″E; 410 m; green mud; 11.8°C; 1 Nov 1908 (1113–1132); 12′ Tanner beam trawl, mud bag: 2 males [2.5, 3.0] 2 females [2.6, 4.1]. Grande Island, Subic Bay, Luzon [41°46′N, 120° 14′E]; 2–6 m; scattered clumps of coral; 8 June 1908 (1300–1730); dynamite: 1 female [4.6] (identification tentative). Southwest of Manila Bay, Luzon: sta 5108; 14°05′05″N, 120°19′45″E; 24 m; coral; 15 Jan 1908 (0834–0835); 9′ Albatross-Blake beam trawl, mud bag (dredging cable fouled on gin block; trawl not dragged on bottom): 1 female [4.0]; sta 5109; 14°03′N, 120°16′30″E; 18 m; coral; 15 Jan 1908 (1026–1038); 9′ Albatross-Blake beam trawl (trawl immediately torn on coral): 1 male [3.8]. Davao Gulf, Mindanao: sta 5249; 7°06′06″N, 125°40′08″E; 42 m; coral, sand; 18 May 1908 (1102–1109); 6′ Johnston oyster dredge: 1 male [3.3].

RANGE.—Maldive Islands, Australia, Indonesia, Philippines, Japan, Mariana Islands; subtidal to 410 meters.

*28. Alpheus euphrosyne euphrosyne De Man, 1897

Alpheus euphrosyne De Man, 1897:745, pl. 36: fig. 64[type locality: Java Sea].

Alpheus eurydactylus De Man, 1920:109 [type locality: Java].

Alpheus euphrosyne euphrosyne.—D.M. and A.H. Banner, 1982:232, fig. 73.

DIAGNOSIS.—(Edwardsii Group). Body not unusually compressed or setose; rostrum acute, not nearly reaching level of distal margin of 1st antennular segment, dorsal carina low, rounded, not extending posteriorly far beyond orbital hoods, base not abruptly delimited from adrostral furrows; carapace without median tooth or tubercle on gastric region, without flattened teeth overhanging posterior ends of adrostral furrows, anterior margin between rostrum and orbital hood unarmed, concave near rostrum, orbital hood unarmed, adrostral furrows shallow or obsolescent; 2nd antennular segment nearly twice as long as wide; basal antennal segment (basicerite) usually unarmed; antennal scale with lateral margin slightly convex, nearly straight, distolateral spine not prominent, usually reaching level of broadly rounded distal margin of blade but sometimes shorter; 1st pereopods with merus usually unarmed on inferior flexor margin; major chela somewhat compressed, about 27 times as long as wide, dactyl lying in longitudinal plane of palm, not double-ended, having well-developed plunger, strong longitudinal ridge extending proximally from heavy, rounded shoulder on margin proximal to fixed finger, “saddle” on opposite margin proximal to adhesive plaque, with proximal shoulder rounded, not overhanging “saddle”; minor chela 4 times as long as wide in male, more than 5 times as long as wide in female, fingers subequal to length of palm in male, slightly longer in female, dactyl distinctly “balaeniceps” in male only; 2nd pereopod with proximal article from slightly longer to more than twice as long as 2nd; 3rd pereopod with dactyl pointed, subspatulate, propodus bearing about 9 spines on flexor margin, carpus with distal extensor angle projecting but bluntly rounded, merus unarmed, ischium with or without movable spine; maximum carapace length to base of rostrum about 27 mm.

MATERIAL.—PHILIPPINES. Manila market, Luzon; 4 Jan 1908: 1 male [21.8]. Inner Sound, Malampaya River, Palawan [10°50′N, 119°24′E]; 1–2 m; soft mud; 26 Dec 1908 (0900–1500); dynamite or seine: 1 female [20.7].

RANGE.—Kenya, Thailand, Philippines, Indonesia, and Queensland, Australia; shallow, muddy, estuarine habitats.