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- Allopora moseleyana forma leptostyla Fisher, 1938: 514, pl. 52, figs, 1–3.
- Allopora moseleyana Fisher, 1938: in part (pl. 50).
- Stylaster moseleyanus forma leptostylus.—Cairns 1983b: 429.
Holotype: Alb-3480, 1 dry male colony 8.5 cm in height, and SEM stub 1544, USNM 43270 (Fig. 17E). Paratypes: Alb-3480, 4 female, 2 male colonies, dry, and SEM stub 1536–38, USNM 76817. Type locality. Alb-3480: 52°06'00"N, 171°45'00"W (off Seguam Island, Amukta Pass), 518 m.
Types. Alb-3480, 2 female, 1 male colonies, dry, USNM 76555 (paratype of Allopora moseleyana).
Corallum uniplanar, branching equal and dichotomous; no anastomosis of branches. Largest colony (the holotype, Fig. 17E) 8.5 cm in height and 7.0 cm in width, with a basal branch diameter of 8.4 mm. All branches circular in cross section. Commensal spionid polychaetes absent. Coenosteum reticulate-granular in texture, the coenosteal strips 45–55 µm in width, the slits about 15 µm in width; strips; strips not linear near cyclosystems. Coenosteum white.
Cyclosystems occur on branch edges and anterior face, but rarely on posterior face, those on edges not aligned in rows. Cyclosystems circular, 1.0–1.1 mm in diameter, and raised only slightly above branch coenosteum. Gastropores about 0.35 mm in diameter, leading to a slightly curved, funnel-shaped upper tube that narrows to a cylindrical lower part that houses the gastrostyle (Fig. 19G–H); ring palisade absent. Gastrostyles elongate-lanceolate, up to 0.6 mm in length, occupying lower half of gastropore tube, its pointed tip easily seen in an intact cyclosystem; H:D about 3.5.
Dactylotomes 0.10-0.13 mm wide; dactylostyles moderate in size, elements up to 50 µm in length. Range of dactylopores per cyclosystem 7–12 (n = 50, average = 9.76 (σ = 1.92), mode = 9). Supernumerary dactylopores absent. Pseudosepta slender and fairly uniform in width (0.10–0.11 mm), an adcauline diastema of twice that width sometimes present.
Female ampullae (Fig. 19D) large, smooth, superficial hemispheres 0.9-1.1 mm in diameter, occasionally having a lateral efferent pore about 0.20 mm in diameter. Male ampullae (Fig. 19A) superficial swellings 0.45-0.55 mm in diameter, often clustered on anterior and posterior branch faces; apical efferent pores about 25 µm in diameter.
Fisher (1938) originally differentiated forma leptostyla from typical Allopora moseleyana (=Stylaster campylecus) based on its more slender gastrostyle and smaller male ampullae. We cannot find a difference in ampulla size between forma leptostyla and typical Stylaster campylecus, but the gastrostyle of leptostyla is longer and more slender than that of Stylaster campylecus, occupying more of the gastropore tube (and thus having a higher H:D ratio) and being more visible from external view. In addition to this difference, forma leptostyla differs from Stylaster campylecus in having equal, non-anastomosing branching; branches circular in cross section; less exsert cyclosystems; non-linearly arranged cyclosystems; fewer dactylopores per cyclosystem; and consistently reticulate coenosteal strips (see Table 2). For these reasons this form is elevated to species rank but is considered to be closely related to Stylaster campylecus.
Known only from type locality.
- Cairns, S; Lindner, A; 2011: A Revision of the Stylasteridae (Cnidaria, Hydrozoa, Filifera) from Alaska and Adjacent Waters ZooKeys, 158: 1-88. doi
- Cairns S (1983b) A generic revision of the Stylasterina (Coelenterata: Hydrozoa). Part 1. Description of the genera. Bulletin of Marine Science 33 (2): 427-508.
- Fisher W (1938) Hydrocorals of the North Pacific Ocean. Proceedings of the United States National Museum 84 (3024): 493-554. doi: 10.5479/si.00963801.84-3024.493