Tegillarca nodifera ( Martens, 1860 )

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) : -

10. Tegillarca nodifera ( Martens, 1860) ( Fig. 5 ; e & f)

1860. Arca nodifera Martens , p. 17

1988. Anadara (Tegillarca) nodifera : Narasimham, pp. 200- 205

1998. Anadara (Tegillarca) nodifera : Evseev & Lutaenko, 23. Pl. 3, fig. B, F.

1998. Anadara nodifera : Poutiers, 148

Material examined: 2ex, Chandrabhaga (19°51.576’N and 084°06.409’E), 27-III-2007, coll. P. Yennawar, ( MARC / ZSI M258 ) ; 1ex, Gopalpur (19°15.449’N and 084°54.559’E), 2-II-2008, coll. P. Yennawar ( MARC / ZSI M3567 ) ; 1ex, Gopalpur (19°15.450’N and 084°54.557’E), 21-IX-2012, coll. P.C. Tudu ( MARC / ZSI M4155 ) ; 1ex, Bokhali (21°

33.302’N and 088° 33.301’E), 23-XII-2012, coll. P.C. Tudu ( MARC / ZSI M2835 ) ; 2ex, Pulicat Lake (13˚25’ 27” N and 80˚19’ 26” E), 12-XII-2014, coll. P.C. Tudu ( MARC / ZSI / M4149 ); 2ex, Talsari (21˚36’ 1.74” N and 87˚27’ 12.86” E) 1-III-2015, coll. P.C. Tudu ( MARC / ZSI M4147 ) .

Description: Shell of medium size (L up to 22.6mm and H up to 17.2mm), ovately elongated, thick, equivalve, moderately inflated and solid; anterior margin smoothly arcuated, ventral margin convex and broadly transformed into the posterior margin and distinctly longer than high. Umbones moderately protruding, cardinal area rather narrow. Radial ribs elevated, trapezoidal in cross-section, with well-expressed nodules which looks like crosses and with regular ridges; number of the shell ribs 19-21; interspaces between the ribs U-shaped in crass section, smooth at their bottoms, somewhat wider than the ribs. Internal margins with strong crenulations corresponding with the external radial ribs. Ligamental area narrow, subtrigonal, with 2-3 chevron grooves, its maximal width anterior of the beak, the posterior part is longer than anterior one. Beak low and prosogyre, hinge plate wide, anterior teeth series 1.5-1.8 times shorter than posterior series, boundary point between series situated posterior tom beak. Peristracum rather thin brownish and smooth.

Distribution: In India: Odisha and West Bengal (present report), Tamil Nadu ( Souji and Radhakrishnan, 2015); Elsewhere: Burma ( Evseev and Lutaenko, 1998), East and South China Seas, Malaysia, Philippines, ( Evseev and Lutaenko, 1998; Poutiers, 1998), Myanmar ( Poutiers, 1998), Taiwan, Vietnam ( Evseev and Lutaenko, 1998), Singapore ( Tan and Woo, 2010), Eastern Indian Ocean to tropical East Pacific ( Poutiers, 1998).

Remarks: A commonly available similar species Tegillarca granosa ( Linnaeus, 1758) is always confused with this species, which varies in having more elongated shell, narrower radial ribs count (15-21) as compared to T. nodifera (19-23) and nodule pattern.

Figures

Figure 5. a-b,Mosambicarca erythraneonensis (Jonas in Philippi, 1851), a-exterior of left valve, b- interior of left valve, c-d, Tegillarca granosa (Linnaeus, 1758); c- exterior of right valve, d- internal view of right valve; e-f, T. nodifera (Martens, 1860); e-exterior of left valve, f- interior of left valve; g-h, T. rhombea (Born, 1778); g-exterior of left valve, h-interior of left valve.