Anadara ferruginea (Reeve, 1844)

Tudu, Prasad Chandra, Yennawar, Prasanna & Mohapatra, Anil, 2019, First report of two ark shells, Anadara consociata (E. A. Smith, 1885) and A. troscheli (Dunker, 1882) (Arcidae: Anadarinae) from Indian waters with notes on morpho-taxonomy of some related species from east coast of India, Records of the Zoological Survey of India 119 (1) : -

4. Anadara ferruginea (Reeve, 1844) ( Fig. 3 ; a & b)

1844. Arca ferruginea Reeve , sp. 39

1844. Arca radiata Reeve , sp. 40

1998. Anadara (Diluvarca) ferruginea : Evseev & Lutaenko, 8 1998. Anadara ferruginea : Poutiers, 154

2006. Anadara (Mabellarca) ferruginea : Lutaenko, 115

2010. Anadara ferruginea : Ramakrishna & Dey, 62

Material examined: 10ex, Rameswaram (09°16.867’N and 079°18.879’E), 7-IX-2014, coll. P.C. Tudu, (Reg. No. MARC / ZSI M4142 ) .

Description: Shell medium in size (L up to 53 and H up to 38mm), elongated, equivalve; anterior margin slightly convex, ventral side smoothly and broadly rounded, posterior side convex in the middle part and wider than the anterior part, without a postero-ventral fold.Umbones less flattened and concave, situated backwardly at slight anterior to the middle of shell. Radial ribs narrowed, rectangular in section, granulated with close and crossed crests that are rather strong in the anterior and central fields of the left valve and in the anterior field of the right valve; interspaces of radial ribs equal to the width of the ribs of the right valve and covered by low ridges continuing into the rib crest; the number radial ribs are 25-27. Ligamental area subtrigonal in shape, shorter and wider in the anterior part than in the posterior part, with four chevron grooves posteriorly and two anteriorly. Hinge plate narrow, the boundary between the anterior and the posterior series unclear. Periostracum brown and film-like on the ribs tops and ciliated along the rib interspaces.

Distribution: In India: Tamil Nadu (Ramakrishna and Dey, 2010), Elsewhere: East and South China Sea, Japan, Philippines, Taiwan, Vietnam ( Evseev and Lutaenko, 1998), Indo-Pacific (Ramakrishna and Dey, 2010).

Remarks: This species shows resemblance with A. craticulata ( Nyst, 1848) in the characteristics of the radial ribs, but that species is distinct in having a more squarish shell covered by ribs with deep intervals ( Evseev and Lutaenko 1998).

Figures

Figure 3. a-b,A. ferriginea (Reeve, 1844), a- exterior of left valve, b- exterior of right valve; c-e, A. inaequivalvis (Bruguière, 1789); c-exterior of left valve, d- exterior of left valve & left valve overlapping the right valve along postero-ventral region, e- umbo; f-g, A. pilula (Reeve, 1843); f- exterior of right valve, g- interior of right valve.