WoRMS taxon details

Astrosarkus idipi Mah, 2003

254800  (urn:lsid:marinespecies.org:taxname:254800)

accepted
Species
marine, brackish, fresh, terrestrial
recent only
Mah, C. L. (2003). <i>Astrosarkus idipi</i>, a new Indo-Pacific genus and species of Oreasteridae (Valvatida; Asteroidea) displaying extreme skeletal reduction. Bulletin of Marine Science 73(3): 685-698, available online at http://www.ingentaconnect.com/content/umrsmas/bullmar/2003/00000073/00000003/art00012?token=004e1e6c1b70af08da6a9e7e442f2067217a763f702e492b2f2d4063687630505d82de8e777bb3 [details]   
Holotype  USNM 1002025  
Holotype USNM 1002025 [details]
Type locality contained in Palau  
type locality contained in Palau [details]
Description External Morphology. Size of adult specimens: mean R of three specimens = 14.1 cm, r = 10.0 cm, R/r = 1.4. Mean thickness...  
Description External Morphology. Size of adult specimens: mean R of three specimens = 14.1 cm, r = 10.0 cm, R/r = 1.4. Mean thickness at arm = 6.3 cm, mean thickness interradially = 3.1 cm. Arms short, bell-shaped. Disk large, thick, confluent with arms (Fig. 1A). Interradii rounded with obtuse angles. Arm tips curve abactinally, abruptly terminate in nipple-like extremity (Fig. 1A,B). Actinal surface concave. Endoskeleton highly-reduced. Modified, almost completely engulfed by thick tissue. Marginal, abactinal, actinal plates not visible externally. Large spines, tubercles, prominent ornamentation absent. Body surface of preserved specimens firm to the touch.

Abactinal, lateral surfaces with fleshy, rounded triangular to oval-shaped, low relief, mounds each bearing 100–150 papulae. Mounds separated by granular densities of 16 mm-2. Granules < 1.0 mm in length, round at base, with mace-shaped tips. Tiny, sessile tong-shaped valvate pedicellariae (typically about 0.5 mm width) present in densities of 16–18 cm-2 interspersed throughout the granular and papular regions (Fig. 2C).
Madreporite subquadrate with curving, sinusoidal grooves projecting from central furrow. Mean madreporite length = 9.0 mm, mean madreporite width = 3.3 mm. Madreporite surrounded by granules, papulae. Madreporite approximately 23 mm from anus.
Anus central on abactinal surface, covered with large, slender, rounded, rod-shaped granules (approximately 0.8–1.0 mm in diameter). Polygonal granules peripheral to rodshaped granules, these large, coarse (0.8–0.6 mm in diameter), becoming progressively smaller, finer, away from anus until size-normalized with other abactinal granules.

Actinal surface concave, depressed toward mouth (Fig. 1B,2A). Actinal surface uniformly granular. Granules round, subquadrate, coarser than those of abactinal surface (approximately 0.5 mm in diameter) (Fig. 2B,C). Dense concentrations of slightly larger valvate pedicellariae (approximately 1.0 mm in width) near mouth (Fig. 2B,C). Smaller (approximately 0.4–0.5 mm) pedicellariae, widely scattered farther from mouth, extending to edge of actinal surface. Papulae present only on abactinal, lateral surface of body. Absent from actinal surface.

Adambulacral spines 11 per plate to 24th or 25th plate, reducing to nine by 40th, one at distalmost adambulacral plate. Adambulacral spines slender, blunt, of varied size. Centrally located spines longest, progressively shorter laterally. Shortest spines blunt, subtriangular. Three to five prismatic to quadrate subambulacral spines (Fig. 2C) per plate. Five subambulacral spines present at 24–25th adambulacral plate from mouth, decreasing to four at 42nd, then to three and finally two near arm terminus. Adambulacral and
subambulacral spines progressively smaller toward arm tip. Two to five shorter, but thicker quadrate to prismatic granules irregularly flank subambulacral spines. Occasional gaps present between subambulacral spines and granules (Fig. 2B,C). Adambulacral plates, subadambulacral spines flanked by two tong-like, or duck-bill shaped pedicellariae. Pedicellariae present between successive adambulacral plates, some recessed into ambulacral groove.
Proximal-most adambulacral (= mouth angle) spines approximately twice as wide as other adambulacral spines, with 13–15 (= 26–30 per MAO) forming distinct stellate perimeter around mouth (Fig. 2B). Spines prismatic, subquadrate, decreasing in size distally. First 6–8 adambulacral (= mouth angle or oral) spines thickest. Two, closely abutting, irregular rows of relatively large (2–3¥ of surface granules), prismatic, quadrate subambulacral granules present abradial to mouth angle spines.

Internal Morphology, Body wall tissue firm, dense. When taken in cross section after mesenteries and peritoneum have been removed, body wall tissue is smooth and soft. (Fig. 3). Extremely dense and structureless at macroscopic levels (i.e., very fine grains lacking). Body wall enve [details]
Mah, C.L. (2018). World Asteroidea Database. Astrosarkus idipi Mah, 2003. Accessed through: World Register of Marine Species at: http://www.marinespecies.org/aphia.php?p=taxdetails&id=254800 on 2018-11-19
Date
action
by
2007-12-17 23:27:22Z
created
2007-12-22 17:11:25Z
changed

Creative Commons License The webpage text is licensed under a Creative Commons Attribution 4.0 License


original description Mah, C. L. (2003). <i>Astrosarkus idipi</i>, a new Indo-Pacific genus and species of Oreasteridae (Valvatida; Asteroidea) displaying extreme skeletal reduction. Bulletin of Marine Science 73(3): 685-698, available online at http://www.ingentaconnect.com/content/umrsmas/bullmar/2003/00000073/00000003/art00012?token=004e1e6c1b70af08da6a9e7e442f2067217a763f702e492b2f2d4063687630505d82de8e777bb3 [details]   

additional source Kogure, Y. A. Kaneko, M. Nonaka, and C. Mah. (2009). A rarely encountered oreasterid sea star, <i>Astrosarkus idipi</i> (Echinodermata, Asteroidea), newly recorded from Japanese waters. Journal of the Biogeographical Society of Japan 11: 73-76  [details]   
 
 Present  Inaccurate  Introduced: alien  Containing type locality 
 

Holotype USNM 1002025 [details]
Paratype BPBM W3509 [details]
Paratype MNHN EcAs 11667 [details]
From editor or global species database
Description External Morphology. Size of adult specimens: mean R of three specimens = 14.1 cm, r = 10.0 cm, R/r = 1.4. Mean thickness at arm = 6.3 cm, mean thickness interradially = 3.1 cm. Arms short, bell-shaped. Disk large, thick, confluent with arms (Fig. 1A). Interradii rounded with obtuse angles. Arm tips curve abactinally, abruptly terminate in nipple-like extremity (Fig. 1A,B). Actinal surface concave. Endoskeleton highly-reduced. Modified, almost completely engulfed by thick tissue. Marginal, abactinal, actinal plates not visible externally. Large spines, tubercles, prominent ornamentation absent. Body surface of preserved specimens firm to the touch.

Abactinal, lateral surfaces with fleshy, rounded triangular to oval-shaped, low relief, mounds each bearing 100–150 papulae. Mounds separated by granular densities of 16 mm-2. Granules < 1.0 mm in length, round at base, with mace-shaped tips. Tiny, sessile tong-shaped valvate pedicellariae (typically about 0.5 mm width) present in densities of 16–18 cm-2 interspersed throughout the granular and papular regions (Fig. 2C).
Madreporite subquadrate with curving, sinusoidal grooves projecting from central furrow. Mean madreporite length = 9.0 mm, mean madreporite width = 3.3 mm. Madreporite surrounded by granules, papulae. Madreporite approximately 23 mm from anus.
Anus central on abactinal surface, covered with large, slender, rounded, rod-shaped granules (approximately 0.8–1.0 mm in diameter). Polygonal granules peripheral to rodshaped granules, these large, coarse (0.8–0.6 mm in diameter), becoming progressively smaller, finer, away from anus until size-normalized with other abactinal granules.

Actinal surface concave, depressed toward mouth (Fig. 1B,2A). Actinal surface uniformly granular. Granules round, subquadrate, coarser than those of abactinal surface (approximately 0.5 mm in diameter) (Fig. 2B,C). Dense concentrations of slightly larger valvate pedicellariae (approximately 1.0 mm in width) near mouth (Fig. 2B,C). Smaller (approximately 0.4–0.5 mm) pedicellariae, widely scattered farther from mouth, extending to edge of actinal surface. Papulae present only on abactinal, lateral surface of body. Absent from actinal surface.

Adambulacral spines 11 per plate to 24th or 25th plate, reducing to nine by 40th, one at distalmost adambulacral plate. Adambulacral spines slender, blunt, of varied size. Centrally located spines longest, progressively shorter laterally. Shortest spines blunt, subtriangular. Three to five prismatic to quadrate subambulacral spines (Fig. 2C) per plate. Five subambulacral spines present at 24–25th adambulacral plate from mouth, decreasing to four at 42nd, then to three and finally two near arm terminus. Adambulacral and
subambulacral spines progressively smaller toward arm tip. Two to five shorter, but thicker quadrate to prismatic granules irregularly flank subambulacral spines. Occasional gaps present between subambulacral spines and granules (Fig. 2B,C). Adambulacral plates, subadambulacral spines flanked by two tong-like, or duck-bill shaped pedicellariae. Pedicellariae present between successive adambulacral plates, some recessed into ambulacral groove.
Proximal-most adambulacral (= mouth angle) spines approximately twice as wide as other adambulacral spines, with 13–15 (= 26–30 per MAO) forming distinct stellate perimeter around mouth (Fig. 2B). Spines prismatic, subquadrate, decreasing in size distally. First 6–8 adambulacral (= mouth angle or oral) spines thickest. Two, closely abutting, irregular rows of relatively large (2–3¥ of surface granules), prismatic, quadrate subambulacral granules present abradial to mouth angle spines.

Internal Morphology, Body wall tissue firm, dense. When taken in cross section after mesenteries and peritoneum have been removed, body wall tissue is smooth and soft. (Fig. 3). Extremely dense and structureless at macroscopic levels (i.e., very fine grains lacking). Body wall enve [details]
 

LanguageName 
English pumpkin starfishdeep-sea cherry blossom starfish  [details]
Japanese 竜宮桜ヒトデ  [details]