Hippurella annulata Allman 1877

Hippurella annulata Allman, 1877 Fig. A2 Hippurella annulata Allman, 1877: 36, pl. 21 figs 7, 8. Antennopsis annulata— Nutting, 1900: 75, pl. 12 figs 7–9.—Fraser, 1944: 318, pl. 66 fig. 303. Antennopsis ramosa Fewkes, 1881: 133, pl. 3 fig. 3.—Stephens & Calder, 2010: 271. Description. Colonies up to 15 cm high, arising from a dense bundle of tubular filaments; stem fascicled throughout, giving rise to monosiphonic, (sub)opposite to alternate side branches, pinnately-set proximally, irregularly arranged distally around the stem; branches divided into rather long internodes, each bearing a nematotheca proximally, and a latero-distal cladial apophysis; axil with conical mamelon and a pair of axillar nematothecae; cladia alternate on the side branches; set in one plane proximally, but surrounding the branches on all sides distally and, there, either scattered or regularly verticillate; heteromerously divided into alternating long, hydrothecate and short, ahydrothecate internodes; two intranodal septa, one proximal, the other distal; hydrothecate internodes with a hydrotheca and its complement of 3 nematothecae, one mesial and a pair of laterals; hydrothecae deep, thimble-shaped, with slightly everted margin, rim even; ahydrothecate internodes with single nematothecae; gonothecae arising singly from the axils of hydrocladia, fusiform, with a somewhat bottle-shaped neck. Remarks. Type material was destitute of a gonosome, but Nutting (1900) found a fertile specimen “among the Albatross material from the West Indies”. Distribution. Off Pacific Reef, Florida (ca. 25°22’ N, 80°08’ W, 517 m); off Charleston, South Carolina (32°7’ N, 78°37’ W, 419 m); off Beaufort, North Carolina (34°39’ N, 75°33’ W, 195 m) [summarized by Nutting (1900)]. FIGURE A2. Hippurella annulata Allman, 1877. A. Whole colony. B. Portion of stem with proximal parts of two consecutive hydrocladia. C. Cladial apophysis. D. Portion of cladium. E. Detail of a hydrotheca. F. Distal part of a branch with gonothecae. Modified after Allman (1877) (A, B), Fewkes (1881, as Antennopsis ramosa) (C), and Nutting (1900, as Antennopsis annulata) (D–F).
Published as part of Galea, Horia R., Di Camillo, Cristina G. & Maggioni, Davide, 2021, An integrative study of Callicarpa gracilis Fewkes, 1881 and Aglaophenia trifida L. Agassiz, 1862, with notes on some hydroids (Cnidaria: Hydrozoa) from French Guiana, pp. 301-341 in Zootaxa 4926 (3) on page 331, DOI: 10.11646/zootaxa.4926.3.1, http://zenodo.org/record/4529212