Figure 1.
Known localities of Edwardsiella andrillae, n. sp.
The site labeled A is at 77° 31.6’ S 171° 20.1’ E ; this corresponds to “Site 3” for the 2010-2011 SCINI dive series. The site labeled B is at 77° 28.03’ S 171° 36.28’ E ; this corresponds to “Site 4 (CH-1)” for the for the 2010-2011 SCINI dive series (Rack et al., 2012).
Figure 2.
External anatomy and habitus of Edwardsiella andrillae n. sp.
A. Close up of specimens in situ. Image captured by SCINI. B. “Field” of Edwardsiella andrillae n. sp. in situ. Image captured by SCINI. Red dots are 10 cm apart.
Figure 3.
Internal anatomy and histology of Edwardsiella andrillae n. sp.
All scale bars =100µm unless otherwise noted. A. Cross section through actinopharynx showing mesenteries and siphonoglyph. Scale = 500µm. B. Cross section through tentacle showing relatively strong ectodermal musculature and abundant spirocysts. C. Longitudinal section through oral disc showing relatively weak ectodermal musculature. Scale bar =20 µm. D. Gametogenic region of mesentery of female specimen. E. Cross section through distal column showing microcnemes. F. Close-up view of actinopharynx, showing histological differentiation of siphonoglyph. G. Trophonema of mature oocyte. Scale bar =30 µm. H. Retractor and parietal muscle of macrocnemic mesentery. I. Retractor muscle of Macrocneme. J. Musculature of base of tentacle. K. Junction between aboral end and mesentery. Note absence of basilar muscles. Scale bar =25 µm. L. Longitudinal section through distal column showing transition between tentacle and capitulum. M. Longitudinal section through scapus. Scale bar =30 µm. N. Longitudinal section through aboral end.
Abbreviations: Apx, actinopharynx; Cap; capituluar ectoderm; DD, dorsal directive mesentery; DL, dorsolateral mesentery; G, gastrodermal side of body wall; P; junction of mesentery and retractor muscle; S, siphonoglyph; T, tentacle; VD, ventrolateral directive mesentery; VL, ventrolateral mesentery.
Figure 4.
Cnidae of Edwardsiella andrillae n. sp.
Scale at bottom, in µm, applies to all images. See Table 1 for size ranges for each capsule type in each tissue. A. Basitrich. B. Spirocyst. C. Spirocyst. Although this capsule is smaller and has a thinner tubule than the spirocyst in Figure 4A, spirocysts show continuous variation in capsule size and robustness. D. Small basitrich. E. Basitrich. F. Small microbasic mastigophore. The small size of these cnidae precludes distinguishing them as b- or p- mastigophores. G. Spirocyst. H. Basitrich. I. Microbasic p-mastigophore. J. Small basitrich. K. Basitrich. L. Microbasic p-mastigophores.