Thalamoporella annmargretae, Martha & Scholz, 2025
publication ID |
https://doi.org/10.11646/zootaxa.5689.2.1 |
publication LSID |
lsid:zoobank.org:pub:BAB0DE16-2C2B-4503-A528-66D20AAC12E0 |
DOI |
https://doi.org/10.5281/zenodo.17319192 |
persistent identifier |
https://treatment.plazi.org/id/753087BE-1549-FFDC-6AFB-FB032CB3F858 |
treatment provided by |
Plazi |
scientific name |
Thalamoporella annmargretae |
status |
nom. nov. |
Thalamoporella annmargretae View in CoL nom. nov.
urn:lsid:zoobank.org:act:
( Fig. 2.1–6 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 View FIGURE 6 )
Thalamoporella arabiensis Amui & Kaselowsky, 2006: 18 View in CoL , figs 23, 24.
Non Thalamoporella arabiensis Guha & Gopikrishna, 2004: 18 View in CoL , figs 13–15; Sonar et al. 2022: 258 View Cited Treatment , fig. 7A–C.
Material examined. Lectotype (here designated): SMF 1900 About SMF (St. 236 KD; Fig. 2.2 View FIGURE 2 ) . Paralectotype: SMF 1900 About SMF (St. 236 KD; Fig. 2.6 View FIGURE 2 , and three other specimens of syntype series) . Paratypes: SMF 1815 About SMF (St. 236 KD; Fig. 2.1, 2.3–5 View FIGURE 2 View FIGURE 3 View FIGURE 4 View FIGURE 5 ) , SMF 1867 About SMF (St. 236 KD) , SMF 1901 About SMF (St. 236 KD) , SMF 1902 About SMF (St. 236 KD) , SMF 1903 About SMF (St. 236 KD).
Etymology. Named in honour of Ann-Margret Amui-Vedel (born 1977), in recognition of her contributions to the study of bryozoan fauna from the Gulf of Aden.
Description. Colonies rigidly erect, multiserial, bilamellar, dichotomously branching ( Fig. 2.1–3 View FIGURE 2 View FIGURE 3 ). Autozooids arranged in alternating series, separated by thin furrows between raised margins. Pore chambers, ancestrula and early astogeny not observed.
Autozooids longitudinally rectangular with convex distal margin and concave proximal margin, 699–950 μm (ẋ = 827 ± 63 µm; CV = 8; N = 49 on 5 specimens) long by 250–429 μm (ẋ = 337 ± 45 µm; CV = 13; N = 49 on 5 specimens) wide ( Fig. 2.4 View FIGURE 2 ). Gymnocyst not visible. Cryptocyst sunken centrally, raised between opesiules and towards orifice, coarsely granular, pierced by circular pseudopores ventrally and proximally. Opesiules paired, asymmetrical, elliptical to teardrop-shaped, proximolateral to the opesia, 173–260 μm (ẋ = 212 ± 19 µm; CV = 9; N = 47 on 5 specimens) long by 160–246 μm (ẋ = 200 ± 20 µm; CV = 10; N = 47 on 5 specimens) wide ( Fig. 2.4 View FIGURE 2 ). Orifice terminal, circular, 105–207 μm (ẋ = 146 ± 21 µm; CV = 14; N = 50 on 5 specimens) long by 44–135 μm (ẋ = 81 ± 20 µm; CV = 25; N = 50 on 5 specimens) wide, having proximally directed condyles slightly proximal to the midline ( Fig. 2.5 View FIGURE 2 ). Spine bases lacking. Spicules comprising only C-shaped calipers, while compass spicules absent ( Fig. 2.6 View FIGURE 2 ). Ovicells hyperstomial, globular, cleithral, 426–489 μm (ẋ = 457 ± 23 µm; CV = 5; N = 5 on 4 specimens) long by 546–572 μm (ẋ = 561 ± 13 µm; CV = 2; N = 4 on 4 specimens) wide; ectooecia completely calcified, smooth, with median suture and triangular fenestra proximally ( Fig. 2.6 View FIGURE 2 ) .
Avicularia and kenozooids not observed.
Remarks. Amui & Kaselowsky (2006) proposed the name Thalamoporella arabiensis for a cheilostome species from the Bab-el-Mandeb Strait. However, this name was preoccupied by a fossil bryozoan described two years earlier by Guha & Gopikrishna (2004) from the Aquitanian deposits of the Khari Nadi Formation in Kachchh, Gujarat, India, rendering the name of Amui & Kaselowsky (2006) a junior homonym (see Sonar et al. 2022). Consequently, Thalamoporella annmargretae nom. nov. is established here as a replacement name, in accordance with Article 60.3 of the International Commission on Zoological Nomenclature ( ICZN 1999).
Amui & Kaselowsky (2006) cited SMF 1900 as the holotype of Thalamoporella arabiensis (now Thalamoporella annmargretae nom. nov.), although it was not illustrated in the original publication. The material consists of five unbleached colony fragments, which may have originated from more than one individual colony. Therefore, in accordance with Article 73.2 ( ICZN 1999), these fragments must be considered syntypes. We here designate the fragment illustrated in Fig. 2.2 View FIGURE 2 as the lectotype, thereby fixing the application of the name in accordance with Article 74.1 ( ICZN 1999).
Thalamoporella annmargretae View in CoL nom. nov. closely resembles Thalamoporella rozieri ( Audouin, 1826) View in CoL , a species originally described from the Red Sea, but it lacks the prominent lateral tubercles flanking the orifice. Additionally, the condyles in Thalamoporella annmargretae View in CoL are more centrally positioned. Another comparable species, Thalamoporella inornata Soule, Soule & Chaney, 1992 View in CoL from Kuda Huraa, Maldives, lacks avicularia and adoral tubercles but has thick, ribbed zooidal margins (see also Soule et al. 1999, figs 61–63). Both Thalamoporella rozieri View in CoL and Thalamoporella inornata View in CoL are characterized by the presence of compass spicules, which are absent in the Bab-el-Mandeb species ( Fig. 2.6 View FIGURE 2 ). Furthermore, Thalamoporella annmargretae View in CoL nom. nov. exhibits an erect growth habit, contrasting with the encrusting forms of its congeners from the Red Sea and the Maldives.
CV |
Municipal Museum of Chungking |
No known copyright restrictions apply. See Agosti, D., Egloff, W., 2009. Taxonomic information exchange and copyright: the Plazi approach. BMC Research Notes 2009, 2:53 for further explanation.
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Thalamoporella annmargretae
Martha, Silviu O. & Scholz, Joachim 2025 |
Thalamoporella arabiensis
Amui, A. - M. & Kaselowsky, J. 2006: 18 |
Thalamoporella arabiensis
Sonar, M. A. & Pawar, R. V. & Wayal, D. V. 2022: 258 |
Guha, A. K. & Gopikrishna, K. 2004: 18 |