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Classification


USNM 19543

Geographic Distribution

Antarctic Convergence illustration Antarctic convergence

Bathymetric Specimen Dispersal

12 individual specimens found for Adelascopora secunda.

Adelascopora secunda   Species

Synonymy

Original Description
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Original Description
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"Adelascopora secunda sp. nov. (Fig. 5E, F)

Material

Holotype : BMNH 1987.9.20.19, "Discovery" stn. 1952, 2.1.1937, 367 - 383 m.

Description

Colony erect, bilaminate, developing flat, flabellate, dichotomously branching fronds ; without chitinous nodes. Holotype material up to 65 mm high, broadening distally to a maximum width of 7 mm ; distance between dichotomies about 10 mm. Autozooids rounded hexagonal, with distal and proximal walls straight ; convex, separated by distinct grooves. Primary orifice wider than long, D-shaped ; mid-distal portion with fine denticulation, proximal edge straight, or very slightly con­cave, with scarcely discernible lip thickened on each side to form minute condylar processes. Frontal wall thinly calcified, hyaline, with numerous small, closely spa­ced, round pseudopores ; ascopore reniform, small, scarcely two or three times the size of the frontal pores, with only a lightly thickened edge, situated almost exactly halfway along length of autozooid. Vertical walls with few, large septula, each with numerous pores. Colony margins and axes of dichotomies edged with large, blind kenozooids. Ovicells not developed in present material.

Measurements, means and standard deviations of 20 values, mm : Autozooid length 1.29 ± 0.11 Orifice length 0.18 ± <0.01 Autozooid width 0.57 ± 0.09 Orifice width 0.25 ± 0.01

Discussion

Specimens of this species were collected from "Discovery" stns. 1952 (South Shetlands) and 190 (Palmer Archipelago). It is distinguished from A. divaricata by its colony form, those of the latter being narrowly cylindrical or flattened, with distinct nodes consisting of cylindrical, chitinous tubes. The autozooids are rather larger than those of A. divaricata, but are otherwise very similar. The lateral sep­tula of A. secunda (Fig. 5F) are proportionately larger than those of A. divaricata (Fig. 5D), with three or four times as many pores. However, apart from this, and their very different colony form, and lacking any information on the ovicells of A. secunda, it is difficult to indicate any further firm distinctions between the two species." (Hayward & Thorpe, 1988b:293-5)

Geographic Distribution

South Shetlands, Palmer Archipelago

Specimens

Displaying 10 of 12 Specimens

Type Status Catalog No. Date Collected Location Coordinates Depth (m) Vessel
  19543 Images Available 2/10/1969 Antarctic Ocean 63.4° S, 62.2° W 119 – 124 Hero R/V
  20551 10/4/1962 South Atlantic Ocean 59° S, 67.3° W 45 Eltanin R/V
  20552 12/31/1962 Antarctic Ocean 61.3° S, 56.1° W 220 – 240 Eltanin R/V
  20553 3/15/1964 Antarctic Ocean 62.7° S, 54.7° W 210 – 220 Eltanin R/V
  20554 2/7/1966 Scotia Sea 53.9° S, 37.6° W 97 – 101 Eltanin R/V
  20555 10/27/1971 South Atlantic Ocean 54.9° S, 63.9° W 771 – 903 Hero R/V
  20556 10/30/1971 South Atlantic Ocean 54.92° S, 64.16° W 493 – 511 Hero R/V
  20557 3/1/1972 Antarctic Ocean 65.04° S, 63.9° W 360 – 370 Hero R/V
  20558 3/16/1982 Antarctic Ocean 65.91° S, 65.29° W 246 – 270 Hero R/V
  20559 3/19/1982 Antarctic Ocean 65.25° S, 64.22° W 270 – 320 Hero R/V

Displaying 10 of 12 Specimens

View additional taxa  View all species collected at same locations as Adelascopora secunda