Integrative taxonomy of calcareous sponges (Porifera: Calcarea) from Réunion Island, Indian Ocean Author Klautau, Michelle Author Lopes, Matheus Vieira Author Tavares, Gabriela Author Pérez, Thierry text Zoological Journal of the Linnean Society 2022 2021-05-06 194 671 725 journal article 20247 10.1093/zoolinnean/zlab014 5cbb504f-e207-44fa-ac62-807a6de2f2db 0024-4082 6354284 3E370CBF-7DD1-4E73-BC37-81BF12EDFEED LEUCETTA CHAGOSENSIS DENDY, 1913 ( FIG. 16 ; TABLE 8 ) Synonyms: Leucetta chagosensis Dendy, 1913: 10 ; Dendy & Row, 1913: 733 ; Dendy & Frederick, 1924: 482 ; Burton, 1963: 241 ; Borojević, 1967: 2 ; Pulitzer-Finali, 1982: 89; Gosliner et al. , 1996: 16 ; Lévi, 1998: 77 ; Wörheide & Hooper, 1999: 882 ; Borojević & Klautau, 2000: 194 ; Wörheide et al. , 2002: 1753 , 2005: 379 ; Baine & Harasti, 2007: 15 ; Wörheide et al. , 2008: 1 ; Voigt et al. , 2012: 101 ; Van Soest & De Voogd, 2015: 51 , 2018: 76 ; George et al. , 2020: 285 ; Klautau et al. , 2020: 279 ; Pasnin et al. , 2020: 6 . Leucetta sp. Colin & Arneson, 1995: 60 (photo 230). Ascoleucetta sagittata Cavalcanti et al. , 2013: 308 ; Van Soest & De Voogd, 2015: 49 ; Lopes et al. , 2018: 59 ; Klautau et al. , 2020: 265 . Figure 16. Leucetta chagosensis . (UFRJPOR 8939). A, specimen in vivo . B, fixed specimen. C, cross-section. D, tangential section of the cortex. E, triactine I. F, triactines II. G, tetractines. cx = cortex, at = atrium. Table 8. Spicule measurements of Leucetta chagosensis (UFRJPOR 8939)

Specimen	Spicule	Actine	Length (µm)		Width (µm)		N
Min	Mean	SD	Max	Min	Mean	SD	Max
UFRJPOR 8939	Triactine I	315.0	410.0	57.9	500.0	25.0	38.3	7.9	55.0	20
Triactine II	130.0	164.8	14.6	195.0	10.0	14.3	2.5	20.0	20
Tetractine	Basal	77.5	124.1	22.5	155.0	10.0	13.1	2.9	17.5	20
Apical	25.0	42.1	9.0	55.0	5.0	6.2	1.3	7.5	13

Type locality: Salomon, Chagos Archipelago, Indian Ocean. M a t e r i a l e x a m i n e d: U F R J P O R 8 9 3 9 (= 171109- PAE2 - TP15 ). Photos : TP6059–6060. Passe de l’Hermitage Reef , La Réunion , Indian Ocean , coll. T . Pérez, 9 November 2017 , 18– 20 m depth . Colour: Lemon-yellow alive and white after fixation ( Fig. 16A, B ). Morphology and anatomy: Sponge formed by several globose parts, each one with a single apical osculum surrounded by membrane ( Fig. 16A, B ). Surface smooth and transparent. Canals can be seen below the surface. Although the atrium is reduced, it obviously receives a large number of exhalant canals. The aquiferous system is leuconoid ( Fig. 16C ). The skeleton is composed of two size categories of cortical triactines ( Fig. 16D ). The small triactines form the main part of the choanosomal skeleton, which has also rare small tetractines surrounding the canals. The atrial skeleton is composed of the small triactines and the rare tetractines.