Copidozoum exiguum ( Barroso, 1920 )

Souto, Javier, Berning, Björn & Ostrovsky, Andrew N., 2016, Systematics and diversity of deep-water Cheilostomata (Bryozoa) from Galicia Bank (NE Atlantic), Zootaxa 4067 (4), pp. 401-459: 407

publication ID

http://doi.org/10.11646/zootaxa.4067.4.1

publication LSID

lsid:zoobank.org:pub:1CC5D0E7-0B60-4E62-BACD-9775931ED7F9

persistent identifier

http://treatment.plazi.org/id/862A8F25-FF89-0C7F-FF65-FEBA5FC73FE1

treatment provided by

Plazi

scientific name

Copidozoum exiguum ( Barroso, 1920 )
status

 

Copidozoum exiguum ( Barroso, 1920) 

( Figs 6–8View FIGURES 6 – 8, Table 3)

Callopora exigua Barroso, 1920: 355  , figs 1–4.

Copidozoum exiguum: Hayward & Ryland 1978: 144  , fig. 2 A; Harmelin & d’Hondt 1992: 34, pl. 2, fig. A; Zabala et al. 1993: 67, fig. 1; Hayward & Ryland 1998: 178, fig. 50; Reverter-Gil & Fernández-Pulpeiro 1999 a: 36, fig. 1 A.

Material examined. MNCNAbout MNCN 25.03 /3925, 3926, locality DR09; MNCNAbout MNCN 25.03 /3927, 3928, locality V01; OLL 2015 / 892, locality V01; OLL 2015 / 893, 894, locality DR05.

Remarks. The Galicia Bank specimens correspond to published descriptions and figures of Copidozoum exiguum  (e.g. Zabala et al. 1993; Hayward & Ryland 1998; Reverter-Gil & Fernández-Pulpeiro 1999 a), which was first described from off Santander (N Spain) by Barroso (1920) as Callopora exigua  . The species is apparently widespread, occurring in the upper bathyal between 180 and 2018 m depth along the continental shelf of the NE Atlantic and western Mediterranean. Its geographic distribution ranges from the Tunisian shelf ( Harmelin 1979) to the Western Approaches to the English Channel, and it is commonly found on the coral Lophelia  ( Hayward & Ryland 1978, 1998; Harmelin & d’Hondt 1992; Zabala et al. 1993). Reverter-Gil & Fernández-Pulpeiro (1999 a) already reported this species from different localities on the continental slope close to Galicia Bank between 450 and 688 m depth.

We here illustrate the ancestrula of C. exiguum  for the first time ( Fig 7View FIGURES 6 – 8). It is similar to an autozooid but smaller and with 14 marginal spines. The ancestrula is surrounded by five autozooids, one distal, two distolateral and two proximolateral.

SD, standard deviation; N, number of measurements

The ooecium of the hyperstomial ovicell is formed by the distal kenozooid, which is invisible from frontal view. The ectooecium is smooth and almost entirely calcified except for a crescentic membranous area on its proximal edge. The borders of this area are thickened.

Copidozoum exiguum  is an abundant species, found at nine localities on Galicia Bank, ranging from 826 to 1138 m depth. The majority of the colonies encrust corals while one was found on a shell and another one on a rock.

TABLE 3. Measurements (in mm) of Copidozoum exiguum.

Minimum Maximum
23
23
23
23
Avicularium cystid length
MNCN

Museo Nacional de Ciencias Naturales

Kingdom

Animalia

Phylum

Bryozoa

Class

Gymnolaemata

Order

Cheilostomatida

Family

Calloporidae

Genus

Copidozoum

Loc

Copidozoum exiguum ( Barroso, 1920 )

Souto, Javier, Berning, Björn & Ostrovsky, Andrew N. 2016

2016
Loc

Copidozoum exiguum:

Reverter-Gil 1999: 36
Hayward 1998: 178
Zabala 1993: 67Hayward 1978: 144

1993
Loc

Callopora exigua

Barroso 1920: 355