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Synalpheus gracilirostris De Man 1910

Comprehensive Description

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

Synalpheus gracilirostris De Man, 1910:291 [type locality: off northeastern point of Timor, Indonesia; 8°25.2'S, 127°18′E; 27–54 meters].—D.M. and A.H. Banner, 1975:372, fig. 26.

DIAGNOSIS.—Rostrum overreaching 1st antennular segment, apex not upurned, narrower at base than orbital teeth; 6th abdominal somite not projecting posteriorly either side of base of telson, posterior margin unarmed mesially; telson with dorsal spines distinct, anterior pair arising at about midlength of telson, posterior angles acute, slightly projecting; stylocerite far overreaching 1st antennular segment; basal antennal segment (basicerite) with ventrolateral tooth not overreaching stylocerite but sometimes reaching equally far, dorsal tooth acute and reasonably prominent, not accompanied proximally by 2nd tooth; antennal scale with blade narrow but not very reduced; major chela with movable finger slightly overreaching fixed finger, palm terminating distally in acute tooth at level of articulation with movable finger; minor chela without patterned row of setae on extensor margin of movable finger, each finger terminating in single tooth; 2nd pereopod with 5 carpal articles; 3rd pereopod with dactyl biunguiculate, extensor tooth slightly longer but no stronger than flexor tooth, segment neither excavate nor swollen on flexor margin, merus unarmed on flexor margin; maximum carapace length to base of rostrum about 4 mm.

RANGE.—Red Sea, eastern Africa, Réunion, Mauritius, Philippines, Indonesia, and Australia; shallow subtidal to 27–54 meters, sometimes in dead coral.

*107. Synalpheus hastilicrassus Coutière, 1905

Synalpheus hastilicrassus Coutière, 1905:1875, pl. 72: fig. 12 [type locality: the type series came from 4 different atolls in the Maldive Islands].—D.M. and A.H. Banner, 1975:353, fig. 21; 1979:242, fig. 4c,d.

Synalpheus acanthitelsonis Coutière, 1905:875, pl. 72: fig. 13 [type locality: the type series came from 5 different atolls in the Maldive Islands].

Synalpheus hastilicrassus, var. acanthitelsoniformis De Man, 1920:108 [type locality: east side of Pulau Pajunga, Teluk Kuandang, north coast of Celebes, Indonesia; reef].

DIAGNOSIS.—Rostrum usually overreaching 1st antennular segment, apex not 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 distinct, posterior angles acute, rather strongly projecting; stylocerite overreaching 1st antennular segment; basal antennal segment (basicerite) with ventrolateral tooth reaching about to level of apex of stylocerite, dorsal margin usually unarmed, sometimes acute; antennal scale with blade reasonably well-developed; major chela with movable finger not appreciably overreaching fixed finger, palm terminating distally in more or less acute tooth at level of articulation with movable finger; minor chela with somewhat patterned row of setae on extensor margin, each finger terminating in single tooth; 2nd pereopod with 5 carpal articles; 3rd pereopod with dactyl biunguiculate, terminal teeth subequal in length, segment neither excavate nor swollen on flexor margin, merus unarmed on flexor margin; uropod with tranverse articulation on lateral branch; maximum carapace length about 7 mm.

MATERIAL.—PHILIPPINES. 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): 2 [3.0, 3.1], 1 ovig [3.0]. Off Jolo Island, Sulu Archipelago: sta 5174; 6°03′45″N, 120°57′E; 37 m; coarse sand; 5 Mar 1908 (1551–1557); 9′ Johnson oyster dredge: 1 [3.9].

RANGE.—Red Sea and eastern Africa to the Philippines, Indonesia, Australia, and the Caroline, Marshall and Fiji islands; shallow subtidal to 90 meters, in coral heads, sometimes sponges.

MATERIAL.—PHILIPPINES. Near Jolo Island, Sulu Archipelago: sta 5141; 6°09′N, 120°58′E; 53 m; coral sand; 15 Feb 1908 (0847–0905); 12′ Agassiz beam trawl, mud bag: 2 [2.9, 3.4], 1 ovig. [3.4] (smaller specimen found on surface of sepia-brown sponge). Near Siasi, Sulu Archipelago: sta 5149; 5°33′N, 120°42′10″E; 18 m; coral, shells; 18 Feb 1908 (0932–0952); 12′ Agassiz beam trawl, mud bag: 1 ovig [3.2].

RANGE.—Southeastern South China Sea, Philippines, Indonesia, and Australia; 13–113 meters.
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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