dc:description"FIGURES 46 – 53. Dilemma spectralis. Holotype, gross anatomy, major organs and anatomical structures. 46. Posterior view. 47. Anterior view with anterior mantle wall removed. 48 – 49. Left lateral views. 48. With part of mantle wall removed. 49. Tilted 30 º to allow viewing of fused mantle margins and some septal ostia. 50. Right lateral view with part of mantle wall removed. 51. Detail of right side of supraseptal chamber showing internal tentacles anterior to excurrent siphons. 52. Detail of right side of septum around byssal opening showing three groups of septal ostia. 53. Detail of mouth area showing labial palps. Note small posterior labial palps and position of foot extremity in relation to mouth. Scale bars: Figure 46 = 3 mm; Figures 51, 52 = 2 mm; Figure 53 = 1 mm. Abbreviations: AA = anterior adductor muscle; ALP = anterior labial palps; ASO = anterior group of septal ostia; BGA = byssal gape; BY = byssus; DD = digestive diverticula; ES = excurrent siphonal opening; F = foot; FM = fused mantle margin; IS = incurrent siphonal opening; ISC = infraseptal chamber; IT = internal tentacles; K = kidney; MO = mouth; MSO = median group of septal ostia; PA = posterior adductor muscle; PBR = posterior byssal retractor muscle; PE = periostracum; PLP = posterior labial palps; PSM = posterior septal muscle; PSO = posterior group of septal ostia; OV = ovary; SE = septum; SC = incurrent siphonal cowl; SSC = supraseptal chamber; ST = stomach (engorged by content, see Figure 57); UT = unpaired tentacle; TE = testis; TN = tentacles (on siphonal area).";
dc:description"FIGURES 54 – 58. Dilemma species, reconstructed macroanatomy. 54 – 57. Dilemma spectralis. 54. Left lateral view with part of mantle wall removed. 55. Detail of mantle cavity in left lateral view showing pair of internal tentacles along posterior edge of excurrent siphon. 56. Detail of mouth region showing labial palps. 57. Posterior region showing siphonal opening, tentacles, and stomach with prey item (a cirolanid isopod.). 58. Comparison of septal ostia in D. frumarkernorum (left) and D. spectralis (right). Posterior view, only left half of septum shown, with dorsal at top and not to scale. Scale bars: Figure 54 = 3 mm, Figure 55 = 2 mm, Figure 56 = 1 mm. Abbreviations: AA = anterior adductor muscle; ALP = anterior labial palps; ASO = anterior group of septal ostia; BO = byssal opening; BY = byssus; DD = digestive diverticula; ES = excurrent siphon; IS = incurrent siphonal opening; ISC = infraseptal chamber; IST = prey item in stomach (a cirolanid isopod); IT = internal tentacles; ITN = tentacles deployed ventrally to incurrent siphon; JTN = tentacles deployed alongside intersiphonal junction; K = kidney; MG = midgut; MO = mouth; MSO = median group of septal ostia; OE = esophagus; PA = posterior adductor muscle; PBR = posterior byssal retractor muscle; PLP = posterior labial palps; PSO = posterior group of septal ostia; OV = ovary; SE = septum; SC = incurrent siphonal cowl; SSC = supraseptal chamber; ST = stomach; UT = unpaired tentacle.";
