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甲殼誌
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Phylum: Arthropoda Class: Crustacea Order: Decapoda Family: Axiidae



Scientific Name 
Acanthaxius formosa
Author 
Kensley and Chan 
Citation 
Remarks. – Although Kensley and Chan (1998) compared A. formosa only with A. polyacantha (Miyake and Sakai, 1967), A. formosa is also very similar to A. miyazakiensis (Yokoya, 1933), redescribed by Sakai and de Saint Laurent, 1989). Acanthaxius formosa may be distinguished from A. miyazakiensis by the possession of scattered small tubercles or granules on the lateral surface of the palm of the major cheliped (first pereopod) and more gently sloping anterolateral margins of the carapace in the dorsal view. Nevertheless, comparison based on specimens is strongly advisable in order to confirm whether these two taxa are really distinct.  
Synonym 
Phylum 
Arthropoda 
SubPhylum 
 
Class 
Crustacea 
Order 
Decapoda 
Family 
Axiidae 
Diagnosis 
Description. – Rostrum reaching just beyond eyes to distal margin of second segment of antennular peduncle, armed with 3 pairs of lateral teeth, flanked by pair of strong supraorbital spines. Carapace with median carina extending onto rostrum and to cervical groove, bearing up to 16 spines; lateral carina bearing 6–10 spines, anteriormost largest; intercarinal space between median and lateral carinae with 2 rows of small spines, about 10 and 5 or 6 spines each; cervical groove well-marked, with few spines on dorsal edge; posterior carapace including branchiostegites bearing numerous scattered small spines or rounded tubercles. Pleuron of first pleonal somite triangular, ventrally acute; those of second and third somites ventrally broadly rounded, those of fourth to sixth somite each with small tooth at posteroventral angle. Telson slightly longer than broad, with small median spine on posterior margin, 2 pairs of small movable spines at posterolateral angles; 2 pairs of spines on dorsal surface. Ocular peduncle moderately long; cornea subglobose, weakly inflated, darkly pigmented. Antennal acicle slender, curved, reaching to base of fourth segment of antennal peduncle. First pereopod large, chelate, unequal. Major first pereopod heavily setose; merus with rows of spines on distal half of dorsal margin and entire ventral margin of merus; lateral surface of merus also with some spines; carpus with 3 spines on dorsal margin, lateral surface with some small spines; palm with 5 spines on dorsal margin and double row of smaller spines on ventral margin extending onto fixed finger; lateral surface of palm with numerous rounded or subacute tubercles; dactylus with row of about 10 spines on dorsal margin; cutting edges of fingers each with row of blunt teeth decreasing in size distally. Second pereopod chelate; merus with 2 or 3 spines on ventral margin. Meri of third and fourth pereopods each with 2 or 3 spines on ventral margin.  
Habitat  
Coloration in life. – Body orange, ventrally lighter; pleon with large male lateral patches; pereopods orange, paler at articulations; cornea dark brown (Kensley and Chan, 1998). Size. – Largest male CL 16.9 mm; largest female CL 17.0 mm, smallest ovigerous female CL 15.2 mm (Kensley and Chan, 1998). Habitat. – Deep-sea benthic, at depth of about 350 m, on sandy-mud bottom, perhaps burrowing in sediments (Kensley and Chan, 1998).  
Distribution  
Distribution. – Known only from southwestern Taiwan (Kensley and Chan, 1998).  
Utility  
 
Provider  
Tin-Yam Chan 
Related  
 
Meno