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Alpheus chiragricus H. Milne Edwards 1837

Comprehensive Description

provided by Smithsonian Contributions to Zoology
Alpheus chiragricus H. Milne Edwards, 1837

Alpheus chiragricus H. Milne Edwards, 1837:354 [type locality: “les mers d'Asie”].—D.M. and A.H. Banner, 1982:267, fig. 82.

DIAGNOSIS.—(Edwardsii Group). Body not unusually compressed or setose; rostrum prominent, 2–3 times as long as wide, reaching nearly as far as distal margin of 1st antennular segment, distinctly carinate in midline, carina extending posteriorly onto anterior gastric region, base not abruptly delimited from adrostral furrows; carapace without median tooth or tubercle on gastric region or strong paired acute teeth overhanging posterior ends of adrostral furrows, anterior margin mesial to orbital hoods unarmed, meeting rostral margin at less than right angle, orbital hoods unarmed, adrostral furrows comparatively deep and narrow; 2nd antennular segment about twice as long as wide; basal antennal segment (basicerite) armed with small, acute ventrolateral tooth not reaching level of tip of stylocerite; antennal scale with lateral margin slightly concave, distolateral spine strong but not unusually stout, distinctly but not greatly overreaching distal margin of blade; 1st pereopods with merus armed with acute distal tooth on inferior flexor margin; major chela somewhat compressed, about 2 times as long as wide, dactyl straight in longitudinal plane, not double-ended, bearing short, truncated plunger, palm without longitudinal carina near margin proximal to fixed finger, with “saddle” proximal to adhesive plaque, both proximal shoulder overhanging “saddle” and shoulder on margin proximal to fixed finger sharply acute; minor chela nearly 4 to nearly 4 times as long as wide, dactyl about as long as palm, “balaeniceps” in male; 2nd pereopod wih proximal carpal article nearly twice as long as 2nd; 3rd pereopod with dactyl pointed, simple, propodus bearing 8 spines on flexor margin, carpus unarmed except for distal tooth on extensor margin, merus unarmed, ischium with strong movable spine; maximum carapace length to base of rostrum perhaps exceeding 25 mm.

RANGE.—Eastern Africa and Madagascar, Mergui Archipelago, Indonesia, and Australia; intertidal to 20 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