Exechonella erinacea ( Canu & Bassler, 1929 )

Cáceres-Chamizo, Julia P., Sanner, Joann, Tilbrook, Kevin J. & Ostrovsky, Andrew N., 2017, Revision of the Recent species of Exechonella Canu & Bassler in Duvergier, 1924 and Actisecos Canu & Bassler, 1927 (Bryozoa, Cheilostomata): systematics, biogeography and evolutionary trends in skeletal morphology, Zootaxa 4305 (1), pp. 1-79 : 10-11

publication ID

https://doi.org/ 10.11646/zootaxa.4305.1.1

publication LSID

lsid:zoobank.org:pub:1192C3A0-5CCB-4A86-903C-A2B82906A5F9

DOI

https://doi.org/10.5281/zenodo.6017306

persistent identifier

https://treatment.plazi.org/id/CF0AB852-FFF7-E923-FF03-FC0296C2E4C9

treatment provided by

Plazi

scientific name

Exechonella erinacea ( Canu & Bassler, 1929 )
status

 

Exechonella erinacea ( Canu & Bassler, 1929)

( Fig. 2 View FIGURE 2 , Table 2)

Coleopora erinacea: Canu & Bassler 1929 , p. 268–269, pl. 19, figs 5–8.

Material examined. Lectotype: USNM 7967 About USNM , encrusting on shell. Philippines, Jolo Island , Jolo Light, 6o 4´25´´N, 120o 58´30´´E, Albatross Station D. 5137, depth 20 fathoms, 14 Febuary 1908. GoogleMaps

Description. Colonies encrusting, unilaminar, multiserial. Autozooids convex, oval, separated by grooves. Very narrow gymnocystal rim is seen between some zooids. Primary orifice oval, wider than long, anter wall underlain by an inner lamina (only visible in oblique view) ending in distolateral triangular condyles with their tips directed to the orifice midline. Long and tubular peristome is pustulose externally. Frontal shield pustulose, with 32–46 rounded or oval foramina. Lumen of each foramen has vertical, wide gymnocystal walls, whereas an area around is a slightly elevated, wide ring with an inner wall surface. In old zooids foramina distally or distolaterally bear a large thick spike-like process. Marginal pores small and rounded, predominantly visible in the distal part of zooid. No avicularia. Adventitious kenozooids of various shapes are seen between autozooids; with 2‒6 pores, each having centrally perforated cuticular plate. Vertical zooidal walls narrow, represented by multiporous mural septula with communication pores arranged in two rows. Ancestrula is unknown.

Remarks. Although E. erinacea was described by Canu and Bassler (1929) as Coleopora , it was suggested later that this species belongs to Exechonella ( Cook & Bock 2004) . It is characterized by the presence of its large thick spike-like process associated with foramina, and its closest relative is E. tuberculata ( MacGillivray, 1883) whose holotype and additional specimens were examined and figured by Cook and Bock (2004) (see above). Although both species show similar foramina structures and large zooids (approximately 1 mm in length), there are a number of differences between them as follows: (1) E. erinacea has a bigger range of the foramina number, 32– 46, whereas it is 16–27 in E. tuberculata ; (2) frontal shield is less prominent and swollen in E. erinacea which makes marginal pores visible, the condition that is absent in E. tuberculata ; (3) there is very narrow gymnocystal rim between zooids in E. erinacea , and it is absent in E. tuberculata ; (4) foraminal processes are pointed in the former species and blunt in the latter; (5) finally, a presence of kenozooids with 2–6 pores is recorded in E. erinacea and not in E. tuberculata .

Philippines

m±sd r n AzL 938.4±60.8 861–1055 7 AzW 754.1±100.3 639–917 7 OrL 190±7.8 181–195 3 OrW 245.3±16.7 236–264 3 FoN 41±4.8 32–46 8 FoD 48.6±7.28 42–61 21 OD 94.19±7.4 79–109 21 Specimen USNM 7967 was mentioned among two cotypes of E. erinacea (as Coleopora ) by Canu and Bassler (1929). We selected it as lectotype. Our check of the second specimen (USNM 7968) showed it does not belong to Exechonella .

Harmer (1957, pl. 54, figs 13, 14) figured two specimens from the New Guinea as E. tuberculata (see also above). One of them is more similar to E. erinacea because the foramina number exceeds 30 and the frontal processes are pointed. Its restudy is required before more definite conclusion can be made. Distribution. The present species is found near the Philippines.

USNM

Smithsonian Institution, National Museum of Natural History

Kingdom

Animalia

Phylum

Bryozoa

Class

Gymnolaemata

Order

Cheilostomatida

Family

Exechonellidae

Genus

Exechonella

Loc

Exechonella erinacea ( Canu & Bassler, 1929 )

Cáceres-Chamizo, Julia P., Sanner, Joann, Tilbrook, Kevin J. & Ostrovsky, Andrew N. 2017
2017
Loc

Coleopora erinacea

: Canu & Bassler 1929
1929
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