Alpheus hood unarmed, somewhat incised near rostral margin, adrostral

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Last updated: August 24, 2019

    Alpheus lobidens DeHaan, 1849 in De Haan, 1833-1850  Synonyms: Alpheus crassimanus Heller, 1862, Alpheus lobidens polynesica Banner& Banner, 1975,  Alpheus crassimanus Heller,1865.

 Distribution: Philippines. Olongapo, Subic Bay, Luzon, Entire Indo-Pacificregion from the Red Sea to Hawaii, as well as eastern and centralMediterranean.  Habitat:Marine; intertidal to 25 meters.Size : 8-10 mmCollectionsite: Vizhinjam, KovalamMaterialsexamined : 6 specimensexamined of  maximum Tl 9 mmDescription: Body not unusually compressed or setose; rostrumacute, triangular, reaching nearly to level of distal margin of 1st antennularsegment, dorsal carina rather sharp, not extending posteriorly beyond orbitalhoods, base not abruptly delimited from adrostral furrows; carapace withoutmedian tooth or tubercle on gastric region, without flattened teeth overhangingposterior ends of adrostral furrows, anterior margin between rostrum andorbital hood unarmed, somewhat incised near rostral margin, adrostral furrows moderatelydeep; 2nd antennular segment about twice as long as wide; basal antennalsegment (basicerite) armed with small ventrolateral tooth not nearly reachinglevel of tip of stylocerite; antennal scale with lateral margin variablyconcave, distolateral spine stout, overreaching blade; 1st  pereopods with or without distal tooth oninferior flexor margin of merus; major chela somewhat compressed, about 2 1/2nd times as long as wide, dactyl notnoticeably curved in longitudinal plane, not double-ended, havingwell-developed plunger, palm with longitudinal groove but no carina near marginproximal to fixed finger, with “saddle” proximal to adhesive plaque,shoulder proximal thereto usually rounded, sometimes abrupt,        but not overhanging “saddle,” shoulderproximal to fixed finger always well developed but varying from rounded toangular; minor chela 3 to 4 3/4th  times as long as wide, dactyl subequal to palmin length, strongly “balaeniceps” in male only; 2nd  pereopod with proximal carpal article 1 1/4th to 1 3/2nd  times as long as 2nd ; 3rd pereopod with dactyl pointed, simple,propodus usually bearing about 10 spines on flexor margin, carpus not produced distallyat propodal articulation, merus unarmed, ischium usually bearing movable spine;maximum carapace length to base of rostrum about 19 mm.

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   Remarks: A. lobidens species areEdwarsii group, different synonyms are used for this species reported fromdifferent parts of the world, but now the synonyms are not accepted. Originaldescription : De Haan, W. (1833-1850).Crustacea.

 In: von Siebold, P.F., Fauna Japonica sive DescriptioAnimalium, quae in Itinere per Japoniam, Jussu et Auspiciis Superiorum, quiSummum in India Batava Imperium Tenent, Suspecto, Annis 1823-1830 Collegit, Notis,Observationibus et Adumbrationibus Illustravit.

 i-xxxi, ix-xvi,1-243, Plates A-J, L-Q, 1-55. Lugduni-Batavorum.

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