Schizoretepora calveti d’Hondt, 1975

Madurell, Teresa, Jones, Mary Spencer & Zabala, Mikel, 2019, Revision of the Genus Schizoretepora (Bryozoa, Cheilostomatida) from the Atlantic-Mediterranean region, European Journal of Taxonomy 536, pp. 1-33 : 8-10

publication ID

https://doi.org/ 10.5852/ejt.2019.536

publication LSID

lsid:zoobank.org:pub:EC4DDAED-11A3-45AB-B276-4ED9A301F9FE

DOI

https://doi.org/10.5281/zenodo.8280690

persistent identifier

https://treatment.plazi.org/id/038B87B1-330E-652E-F97C-FD7BF1F0FA16

treatment provided by

Plazi

scientific name

Schizoretepora calveti d’Hondt, 1975
status

 

Schizoretepora calveti d’Hondt, 1975 View in CoL

Fig. 4 View Fig , Table 1 View Table 1

Schizoretepora calveti d’Hondt, 1975: 581 View in CoL .

Schizellozoon tesselatum – Calvet 1931: 108, pl. 2, fig. 32.

Material examined

Lectotype (designated here)

AÇORES • 3 fragments; 36º54.0 N, 25º09.5 W; 665–712 m; on gravel and pebbles; R/V Jean-Charcot Biaçores 1971 exped., st. 230; MNHN-IB- 2008 -7565. GoogleMaps

Description

Colony erect and delicate, arborescent, dichotomously branched, vinculariform (never fenestrate) ( Fig. 4A View Fig ). Frontal faces bearing autozooids, abfrontal faces consisting of sheets of kenozooids. Branches thin, with two alternate series of autozooids.

Autozooids longer than wide, separated by distinct sutures. Branches biseriate, arranged in two alternating series of zooids (young apical branches), or triseriate quincuncially arranged (older basal branches). Frontal shield surface rippled, with meandering reliefs ( Fig. 4A View Fig ).

Primary orifice obscured by a tubular peristome, only its proximal side being visible through the spiramen. Proximal border provided with sharp, flat condyles drawing a U-shaped shallow sinus; distal border not observed ( Fig. 4B View Fig ).

Peristome well-developed. In young zooids it grows as two lobes, slightly widening at its free edge, embodying 6–8 spiniform processes on each side and converging at the anterior end ( Fig. 4B, E View Fig ), but remaining cut by large circular spiramen, shaped like ace of spades ( Fig. 4 View Fig A–B, E); in older zooids, distal end of lobes appear just denticulate and spiramen disappears ( Fig. 4D View Fig ).

One to three very large acute avicularia (usually paired), placed over large cystid in middle of frontal shield (when single) on both sides of aperture (when paired), mostly directed proximally, but sometimes distally ( Fig. 4E View Fig ). Rostrum acute and distally hooked, with stout bar without columella. One round pore on each side of cystid, 2 to 4 for entire frontal.

The ovicell in the type material (incompletely developed?) is hyperstomial, resting distally on adjacent zooid frontal shield, longer than wide; cut by large frontal fissure, broader at its distal end, smooth and imperforate, non-cleithral ( Fig. 4A, E View Fig ).

Abfrontal side consisting of sheets of irregular kenozooids separated by raised sutures; surface rippled, with numerous avicularia of two types: one similar to those on frontal, large and acute, 1–3 per kenozooid, becoming occluded by secondary calcification; and small elliptical avicularia rarely present (might be the anterior part of the large avicularia from which distal end has been occluded by calcification) ( Fig. 4F View Fig ).

Schizoretepora calveti is a deep-water species that has only been reported from the Azores archipelago, 599–712 m deep.

Remarks

This species was first figured by Calvet (1931) and considered as a variety of Schizellozoon tessellatum . D’Hondt (1975) noticed the differences in the material dredged by the Jean-Charcot during the Biaçores mission and that figured by Calvet (1931). After comparison with the type material sent by the British Museum he erected a new species: Schizoretepora calveti . D’Hondt (1975) did not designate a lectotype from his material; therefore, we formally designate here as type material the specimen MNHN-IB-2008-7565.

Looking at the abfrontal avicularia, this species resembles the Mediterranean species Reteporella pelecanus ( López de la Cuadra & García Gómez, 2001) . However, the latter species is a true Reteporella Busk, 1884 , possessing frontal labial avicularia and ovicells with an elongate median fissure not observed in the genus Schizoretepora . Nonetheless, the aspect of the frontal side with the circular spiramen and long peristome makes S. calveti unmistakable.

Table 1. Measurements of Schizoretepora calveti d’Hondt, 1975.

  N MEAN SD MIN MAX
AzL 18 970 84 750 1097
AzW 18 568 116 396 746
ApL 22 210 36 160 289
ApW 22 180 30 124 242
VAL 40 329 53 227 440
VAW 40 117 35 76 219
AbAL 2 121 5 118 125
AbAW 2 66 7 61 71
AbVL 21 276 22 228 309
AbVW 21 87 9 71 106
OVL 4 269 14 258 289
OVW 4 223 19 197 241
Np 12 4 1 2 4
Np_Ab 10 3 1 2 5

Kingdom

Animalia

Phylum

Bryozoa

Class

Gymnolaemata

Order

Cheilostomatida

Family

Phidoloporidae

Genus

Schizoretepora

Loc

Schizoretepora calveti d’Hondt, 1975

Madurell, Teresa, Jones, Mary Spencer & Zabala, Mikel 2019
2019
Loc

Schizoretepora calveti d’Hondt, 1975: 581

d'Hondt J. - L. 1975: 581
1975
Loc

Schizellozoon tesselatum

Calvet L. 1931: 108
1931
GBIF Dataset (for parent article) Darwin Core Archive (for parent article) View in SIBiLS Plain XML RDF