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Synalpheus antenor De Man 1910

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Synalpheus antenor De Man, 1910

Synalpheus Antenor De Man, 1910:293 [type locality: 2 stations in the eastern Halmahera Sea off western New Guinea and 1 station off Banda, Banda Sea; 9 to 59–83 meters]; 1911:294, pl. 13: fig. 62.

Synalpheus antenor.—D.M. and A.H. Banner, 1979:240.

DIAGNOSIS.—Rostrum not nearly reaching level of distal margin of 1st antennular segment, tip not upturned, narrower at base than orbital teeth; 6th abdominal somite not projecting posteriorly either side of telson, posterior margin unarmed mesially; telson with dorsolateral spines fairly prominent, anterior pair situated just anterior to midlength of telson, posterolateral angles rectangular; stylocerite distinctly overreaching 1st antennular segment; basal antennal segment (basicerite) with ventrolateral tooth slightly overreaching stylocerite, dorsal tooth subacute, not spinose, not accompanied by 2nd, proximal tooth; antennal scale with blade rudimentary or absent, major chela with palm terminating distally in acute tooth in male, in blunt tubercle in female; minor chela without patterned row of setae on extensor margin of movable finger, movable finger terminating in 2 acute teeth and 1 truncate lobe, fixed finger in 4 acute teeth; 2nd pereopod with 5 carpal articles; 3rd pereopod with dactyl biunguiculate, extensor tooth longer than but basally subequal in width to flexor tooth, segment neither excavate nor swollen on flexor margin, merus unarmed on flexor margin; maximum carapace length to base of rostrum about 13 mm.

RANGE.—Southern Philippines and Indonesia; intertidal to 59–83 meters, associated with sponges, coral heads, and brittle star.

*101. Synalpheus bituberculatus De Man, 1910

Synalpheus bituberculatus De Man, 1910:294 [type locality: 7 stations in Indonesia; shallow subtidal to 36 meters]; 1911:276, pl. 11: fig. 53.—D.M. and A.H. Banner, 1975:307, fig. 8.

DIAGNOSIS.—Rostrum not nearly overreaching 1st antennular segment, apex upturned, narrower at base than orbital teeth; 6th abdominal somite not projecting posteriorly either side of base of telson, posterior margin unarmed mesially; telson with dorsolateral spines prominent, anterior pair situated anterior to midlength of telson, posterior angles subacute but not projecting; stylocerite overreaching 1st antennular segment; basal antennal segment (basicerite) with ventrolateral tooth overreaching stylocerite, dorsal tooth acute but short, not accompanied by 2nd, proximal tooth; antennal scale with blade narrow but not vestigial; major chela with movable finger slightly overreaching fixed finger, palm terminating distally in usually 2 blunt tubercles at level of articulation with movable finger; minor chela with movable finger not bearing patterned row of setae on extensor margin, terminating in 2 acute teeth, fixed finger terminating in single strong tooth and, sometimes, small accessory tooth; 2nd pereopod with 5 carpal articles, 3rd pereopod with dactyl biunguiculate, extensor tooth about twice as long as flexor tooth, segment neither excavate nor swollen on flexor margin, merus armed with series of movable spines on distal of flexor margin; uropod with transverse articulation on lateral branch; maximum carapace length to base of rostrum about 7mm.

MATERIAL.—PHILIPPINES. Off Jolo Island, Sulu Archipelago: sta 5145; 6°04′30″N, 120°59′30″E; 42 m; coral sand, shells; 15 Feb 1908 (1344–1359); 12′ Agassiz beam trawl, mud bag: 2 [3.6, 4.7], 1 ovig [4.7]. Near Siasi, Sulu Archipelago; sta 5146; 5°46′40″N, 120°48′50″E; 44 m; coral sand, shells; 16 Feb 1908 (1011–1031); 12′ Agassiz beam trawl, mud bag: 2 [4.1, 5.0], 1 ovig [5.0], San Juanico Strait, between Samar and Leyte: sta 5205; 11°19′30″N, 124°58′05″E; 15 m; 13 Apr 1908 (0928); 12′ Agassiz beam trawl, 3 mud bags (fouled bottom; trawl lost; mud bag only recovered; sounding with hand lead): 1 ovig [5.9].

RANGE.—Réunion, Mauritius, Singapore, Thailand, Indonesia, Philippines, Japan and Australia; to a depth of 44 meters, commonly in sponges and dead coral.
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bibliographic citation
Chace, Fenner Albert, Jr. 1997. "The Caridean shrimps (Crustacea:Decapoda) of the Albatross Philippine Expedition, 1907-1910, Part 7: Families Atyidae, Eugonatonotidae, Rhynchocinetidae, Bathypalaemonidae, Processidae, and Hippolytidae." Smithsonian Contributions to Zoology. 1-106. https://doi.org/10.5479/si.00810282.381.1