Morphological and phylogenetic study of the Western Atlantic Crepidula plana complex (Caenogastropoda, Calyptraeidae), with description of three new species from Brazil Author Simone, Luiz Ricardo L. text Zootaxa 2006 2006-01-20 1112 1 1 64 https://biotaxa.org/Zootaxa/article/view/zootaxa.1112.1.1 journal article 10.11646/zootaxa.1112.1.1 1175­5334 5057713 6113143E-CCCD-48FB-BEEB-B67B2CBC0BAF Crepidula cachimilla Cledón, Simone & Penchaszadeh (2004) The anatomical description provided by Cledón, Simone & Penchaszadeh (2004) is appropriate. All descriptive and taxonomic treatment is given in that paper. FIGURES 1–15, Shells . Figs.1–2: Crepidula plana , dorsal and ventral views, MZSP 36327. Fig.3:4: C. atrasolea , dorsal and ventral views, MZSP 36328. Figs.5–6: C. depressa , dorsal and ventral views, MZSP 36326. Figs.7–9: C. pyguaia , dorsal, ventral views and detail of the protoconch, MZSP 35831 (Holotype). Figs.10–12: C. margarita , MZSP 36329, dorsal, central and right views. Fig.13–15: C. intratesta , MZSP 30791 (Holotype), left, dorsal and ventral views. Scale bars = 2 mm. FIGURES 16–25, Shells . Figs.16–18: Crepidula protea , MZSP 30780, dorsal, ventral and right views. Figs. 19–21: C. glauca , MZSP 30810, left, dorsal and ventral views. Fig. 22–25: C. carioca . Figs. 22–23: Holotype, ventral and dorsal views. Figs. 24–25, paratype 1, MNRJ 7464, dorsal and ventral views. Scale bars = 2 mm. FIGURES 26–34, Radulae in SEM: Figs.26–27: Crepidula margarita . Figs. 28–29: C. plana . Figs.30–31: C. atrasolea . Fig. 32: C. depressa . Scale bars = 30 “m, except Fig. 11 = 20 “m. Fig. 33: C. carioca . Fig.34: C. pyguaia . FIGURES 35–37, Crepidula margarita anatomy . Fig. 35: whole view of a specimen removed from shell, female, dorsal view. Fig. 36: head:foot, female, dorsal view, pallial cavity and visceral mass removed. Fig. 37: pallial cavity roof, detail of region of osphradium and anterior end of gill, ventral view. Scale bars = 1 mm. FIGURES 38–44, Crepidula margarita anatomy . Fig. 38: visceral mass and pallial cavity separated from head­foot, ventral view. Fig. 39: same, ventral portion of visceral mass (floor of pallial cavity) sectioned longitudinally at left (right in Fig.) and deflected, some portions of gill filaments partially removed, pallial roof exposed. Fig. 40: pallial cavity roof, transversal section tangent to rectum. Fig. 41: visceral mass portion encroaching in pallial roof, ventral view, ventral membrane of pericardium mostly removed, only a short portion of gill shown. Fig. 42: head and haemocoel, ventral view, foot removed. Fig. 43: foregut, ventralslightly left view, nerve ring shown as in situ. Fig. 44: dorsal portion of buccal mass, ventral view, odontophore removed, anterior esophagus partially sectioned longitudinally and part deflected. Scale bars = 1 mm. FIGURES 45–51, Crepidula margarita anatomy . Fig. 45: isolated odontophore, ventral view. Fig. 46: same, dorsal view. Fig. 47: same, ventral view, superficial membrane removed, some muscles sectioned transversally, insertion of some muscles shown by transparency. Fig. 48: same, dorsal view. Fig. 49: odontophore, ventral view, subradular membrane removed, both cartilages strongly deflected, right m4 and m5 deflected. Fig.50: pallial oviduct and adjacent structures, ventral view. Fig. 51: digestive tubes as in situ, ventral view, topology of pallial oviduct also shown. Scale bars= 0.5 mm. FIGURES 52–56, Crepidula plana anatomy . Fig. 52: whole view of a specimen removed from shell, female, dorsal view. Fig. 53: head­foot, female, dorsal view, pallial cavity and visceral mass removed. Fig. 54: visceral mass and pallial cavity separated from head­foot, ventral view. Fig. 55: same, ventral portion of visceral mass (floor of pallial cavity) sectioned longitudinally at left (right in fig.) and deflected, some portions of gill filaments partially removed, pallial roof exposed. Fig. 56: pallial cavity roof, transversal section tangent to rectum. Scale bars = 2 mm. FIGURES 57–62, Crepidula plana anatomy . Fig. 57: pallial cavity roof, detail of region of osphradium and anterior end of gill, ventral view. Fig. 58: head and haemocoel, ventral view, foot removed. Fig. 59: visceral mass portion encroaching in pallial roof, ventral view, ventral membrane of pericardium mostly removed, only a short portion of gill shown. Fig. 60: isolated odontophore, dorsal view. Fig. 61: same, ventral view. Fig. 62: digestive tubes as in situ, ventral view, topology of pallial oviduct also shown, some inner gastric structures seen by transparency. Scale bars = 1 mm. FIGURES 63–67, Crepidula plana anatomy . Fig. 63: head­foot, male, dorsal view, pallial cavity and visceral mass removed. Fig. 64: visceral organs of male genital system, ventral view, seminal vesicle partially uncoiled, remainder as in situ. Fig. 65: isolated visceral mass, male, ventral view, structures seen by transparency. Fig. 66: pallial oviduct and adjacent structures, ventral view. Fig. 67: penis and some adjacent structures, ventral view. Scale bars = 1 mm. FIGURES 68–72, Crepidula atrasolea anatomy . Fig. 68: whole view of a specimen removed from shell, female, dorsal view. Fig. 69: head­foot, female, dorsal view, pallial cavity and visceral mass removed. Fig. 70: visceral mass and pallial cavity separated from head­foot, ventral view. Fig. 71: same, ventral portion of visceral mass (floor of pallial cavity) sectioned longitudinally at left (right in fig.) and deflected, some portions of gill filaments partially removed, pallial roof exposed. Fig. 72: pallial cavity roof, transversal section tangent to rectum. Scale bars = 2 mm. FIGURES 73–78, Crepidula atrasolea anatomy . Fig. 73: pallial cavity roof, detail of region of osphradium and anterior end of gill, ventral view. Fig. 74: visceral mass portion encroaching in pallial roof, ventral view, ventral membrane of pericardium mostly removed, only a short portion of gill shown. Fig. 75: head and haemocoel, ventral view, foot removed. Fig. 76: isolated odontophore, ventral view. Fig. 77: visceral mass portion encroaching in pallial roof, ventral view, details of renal area, ventral membrane of pericardium removed, renal ventral wall sectioned longitudinally and deflected, inner structures exposed. Fig. 78: middle and distal digestive tubes, ventral view, seen as in situ, some adjacent structures also shown. Scale bars = 1 mm. FIGURES 79–82, Crepidula atrasolea anatomy . Fig. 79: head­foot, male, dorsal view, pallial cavity and visceral mass removed. Fig. 80: isolated visceral mass, male, ventral view, structures seen by transparency. Fig. 81: penis, ventral view. Fig. 82: pallial oviduct as in situ, ventral view. Scale bars = 0.5 mm. FIGURES 83–87, Crepidula depressa anatomy . Fig. 83: whole view of a specimen removed from shell, female, dorsal view. Fig. 84: head­foot, female, dorsal view, pallial cavity and visceral mass removed. Fig. 85: pallial cavity roof, transversal section tangent to rectum. Fig. 86: visceral mass and pallial cavity separated from head­foot, ventral view. Fig. 87: same, ventral portion of visceral mass (floor of pallial cavity) sectioned longitudinally at left (right in Fig.) and deflected, some portions of gill filaments partially removed, pallial roof exposed. Scale bars = 2 mm. FIGURES 88–96, Crepidula depressa anatomy . Fig. 88: pallial cavity roof, detail of region of osphradium and anterior end of gill, ventral view. Fig. 89: head and haemocoel, ventral view, foot removed. Fig. 90: dorsal region of buccal mass, ventral view, odontophore removed, anterior esophagus sectioned longitudinally, inner surface exposed. Fig. 91: head­foot, male, dorsal view, pallial cavity and visceral mass removed. Fig. 92: digestive tubes as in situ, ventral view, topology of pallial oviduct also shown. Fig. 93: isolated visceral mass, male, ventral view, structures seen by transparency. Fig. 94: central nervous system, ventral view, adjacent portion of esophagus also shown, a single statocyst shown. Fig. 95: detail of female genital papilla, posterior view. Fig. 96: pallial oviduct as in situ, ventral view. Scale bars = 1 mm. FIGURES 97–101, Crepidula pyguaia anatomy . Fig. 97: head­foot, female, dorsal view, pallial cavity and visceral mass removed. Fig. 98: pallial cavity roof and visceral mass, dorsal view, head­foot removed. Fig. 99: visceral mass and pallial cavity separated from head­foot, ventral view, ventral portion of visceral mass (floor of pallial cavity) sectioned longitudinally at left (right in Fig.) and deflected, some portions of gill filaments partially removed, pallial roof exposed. Fig. 100: pallial cavity roof, detail of region of osphradium and anterior end of gill, ventral view. Fig. 101: pallial cavity roof, transversal section tangent to rectum. Scale bars = 2 mm. FIGURES 102–106, Crepidula pyguaia anatomy . Fig. 102: visceral mass portion encroaching in pallial roof, ventral view, ventral membrane of pericardium removed, renal ventral wall sectioned longitudinally and deflected, inner structures exposed. Fig. 103: head and haemocoel, ventral view, foot removed. Fig. 104: odontophore, ventral view, both cartilages deflected, left m5 deflected, radular ribbon removed and deflected downwards. Fig. 105: digestive tubes as in situ, ventral view, topology visceral mass shown. Fig. 106: pallial oviduct as in situ, ventral view, topology of anus also shown. Scale bars = 0.5 mm. FIGURES 107–110, Crepidula carioca anatomy . Fig. 107: pallial cavity roof, detail of region of osphradium and anterior end of gill, ventral view. Fig. 108: head­foot, male, dorsal view, pallial cavity and visceral mass removed. Fig. 109: isolated visceral mass, male, ventral view, structures seen by transparency. Fig. 110: pallial oviduct as in situ, ventral view, topology of anus also shown. Scale bars = 1 mm. FIGURES 111–115, Female genital structures . Fig. 111: Crepidula protea , detail of pallial oviduct, ventral view, adjacent structures also shown, genital papilla somewhat deflected. Figs. 112–115: detail of genital papilla, ventral­slightly left view: Fig. 112: C. intratesta . Fig. 113: C. glauca . Fig. 114: C. fornicata . Fig. 115: C. argentina . Scale bars = 0.25 mm (Fig. 112, same scale than 113). Discussion of the characters