Lyratellina juttingae Altena, 1965

Simone, Luiz Ricardo L., 2024, New species, misidentifications and problematic taxonomy of some Atlantic South American marine mollusks: a review, Papéis Avulsos de Zoologia 64, pp. 1-104 : 87

Lyratellina juttingae Altena, 1965 ( Fig. 58 )

Lyratellina juttingae Altena, 1965: 52 (fig. 1a-e); MolluscaBase, 2023; Passos et al., 2024: 62.

Tellina (Merisca) juttingae : Rios, 2009: 546 (fig. 1520).

Type locality: N of the mouth of the Surinam River, 20 miles off the coast, 15 fms.

Remarks: This report is only an expansion of geographic distribution. The previous report is from Trinidad to Amapá, Brazil, but a sample of this species was collected off Pará, ~ 500 km southwards.

Interestingly, the very characteristic shell of L. juttindae ( Fig. 58 A-B, D-E), has a wide anterior region and walls relatively fragile, translucent walls. In the anatomy ( Fig. 58C ), it has a foot (ft) with a furrow along anterior edge, and relatively small and narrow siphons (ex, in). The retractor muscles of siphons (sm) are reunited in a pair of single central, longitudinal bundles. The palps (pp) are proportionally very large, comparable to the gill (id, od) size. As every tellinid, the protractor foot muscles (pr) have their origin partially dividing the anterior adductor muscle (aa).

Material examined: BRAZIL. Pará; off Rio Amazonas mouth, 3.94464°N 50.27423°W, 62.8 m, MZSP 166334 , 2 spm (otter trawl, sta. 77, 25.v.2018, Wagner César R. Santos leg.) .

Figures

Figure 58. Lyratellina juttingae MZSP 166334, from off Pará:(A) left valve,outer view (L 35.3 mm); (B) same, inner view;(C) entire specimen,left view,left valve and left mantle lobe removed;(D) detail of hinge, left valve,inner view;(E) same,right valve.Scale:= 2 mm. Lettering:aa,anterior adductor muscle;ap,posterior adductor muscle; ar, anterior foot retractor muscle; cm, cruciform muscle; ex, excurrent siphon; ft, foot; go, gonad; hi, hinge; id, inner demibranch; in, incurrent siphon; li, ligament; mb, mantle border; od, outer demibranch; pc, pericardium; pl, posterior lateral tooth; pp, palps; pr, foot protractor muscle; rr, posterior foot retractor muscle;sc,siphonal chamber;sh,shell;sm,siphonal retractor muscle;um, umbo.