Year;Author;"Descriptions / Statements" 1867;Selenka;"Description of Stelletta bacca. Selenka’s material was collected in Samoa Island and due to the presence of triaenes this species was associated to the family Corticatae (now Astrophorida: Ancorinidae). The description is brief but the sketches included are illustrative, including “Vierstrahler” (=calthrop-like) spicules. Sigma-like spicules are neither mentioned in the description nor drawn in the figures. Currently, type specimen could not be located." 1883;Carter;"Description of Tethya merguiensis, including sigmaspires, calthrop-like spicules, oxeas and triaenes and their respective measurements and sketches." 1884;Ridley;"In his monograph, Ridley kept Stelletta bacca in the genus Stelletta. The diagnostic characteristic for Stelletta for his decision was the absence of bacillar or acerate flesh-spicules. He also noticed that the Samoan Stelletta “is probably a Tethya, as its stellate agrees with the large stellate of that genus, and its forks are rare and probably foreign to the sponge” (see footnote in Ridley 1884, p. 472)." 1887;Vosmaer;"Statement about Stelletta bacca mentioning that it can hardly belong to Stelletta genus without further argumentation." 1888;Sollas;"Establishment of Family Tetillidae, type genus Tetilla Schmidt, 1868. Sponges in this family have sigmaspires (microscleres) and slender protriaenes (megascleres) as diagnostic characters. In this family Sollas included the species Craniella (Alcyonium) cranium Müller (1789), species under the genus Tethya by Lamarck (1815) and Gray (1867), and species within the group Tethyina Carter (1875). Carter’s material of Tethya merguiensis was redescribed and transferred to the genus Tetilla, as Tetilla merguiensis. Tethya cranium var. australiensis was redescribed as Tetilla (?) australiensis. Many other species were also described by Sollas within this family." 1896*;Kieschnick;"Description of Tetilla ternatensis based on material from Ternate Island (Indonesia); he mentioned “Vierstrahler” (=calthrops)." 1897;Lindgren;"Tethya merguiensis Carter, 1873 as junior synonym to Stelletta bacca, based on a comment by Sollas (1888, p. 205) of his monograph: “Stelletta bacca, Selenka, which Vosmaer correctly excludes from Stelletta, while Ridley includes it, is as mounted preparations show, identical with Tetilla merguiensis, Carter”. However, neither Ridley (1884) nor Vosmaer (1887) supported their inclusion or exclusion of the species with any description of the Selenka specimen, but apparently, they were based merely on the published description. It is remarkable that Sollas in the same monograph (1888) identified the Challenger specimens as Tetilla merguiensis, including for the first time this genus and species under the family Tetillidae due to the characteristic sigmaspires." 1898*;Lindgren;"Redescription of Tetilla bacca, with Tetilla merguiensis as junior synonym, including material of Torres Straits (North Australia), two localities at Java (Indonesia) and Carter’s specimens from Mergui Archipelago. Size range for each station is shown for oxeas and triaenes, arguing that larger spicules are found to the west while smaller sizes to the east. Redescription of Tetilla ternatensis based on Java material. It is remarkable that he mentioned the presence of numerous microxeas (240 × 4 µm) and sigmaspires 24 µm." 1898;Kieschnick;"Description of Tetilla amboinensis, Tetilla violacea and Tetilla rubra from Amboina Island, all of them with “Vierstrahler” (=calthrop-like) spicules. T. amboinensis and T. violacea with calthrops in a layer below the surface of the sponge; while the former is characterized by smaller number of triaenes and bundles of oxeas up to the surface of the sponge, the latter by very abundant triaenes, bundles of oxeas projected over the surface of the sponge, and a typical violet color. T. rubra separated from the other two by its brick-red color and with calthrops mainly on the basal part of the sponge." 1900;Kieschnick;"Extensive description of the same three new species." 1900*;Thiele;"Redescription of Tetilla ternatensis Kieschnick, 1896. Thiele drew attention on the misidentification of T. ternatensis by Lindgren (1898), clarifying that Lindgren specimens exhibited microxea resembling Tetilla australiensis (Carter, 1886). Moreover, Thiele proposed that T. ternatensis, as well as Kieschnick’s species T. amboinensis, T. violacea and T. rubra, should be junior synonyms of T. bacca arguing that T. bacca shows a large morphological variability." 1900*;Kirkpatrick;"Extension of the geographical range of T. bacca and T. ternatensis to Christmas Island. T. bacca specimens were described with identical spicules to Lindgren’s (1898) material from Java. T. ternatensis also similar to Lindgren’s (1898) material of T. ternatensis." 1903*;Lendenfeld;"Designation of a new species Tetilla lindgreni based on Lindgren’s specimens (1898) from Java and Kirkpatrick’s specimens (1900) from Christmas islands, both identified as T. ternatensis without calthrops and with small microxeas. Thus, Lendenfeld concluded that those specimens belong to a new species (T. lindgreni) because they did not show calthrops as in the original description of Kieschnick (1896). Junior synonyms for Tetilla bacca, including the material of Selenka, Carter, Sollas, and Kirkpatrick. T. ternatensis and T. violacea described by Kieschnick and recorded by Thiele (1900) were also included as junior synonyms of T. bacca. Tetilla amboinensis Kieschnick (1898) was transferred to genus Cinachyra and T. rubra was established as its junior synonym." 1905;Dendy;"The genus Paratetilla was erected within the family Tetillidae, based on the presence of calthrop-like spicules. Thus, Tetilla bacca is transferred to Paratetilla genus, including their junior synonyms T. merguiensis, as well as the three Kieschnick’s species T. ternatensis, T. amboinensis and T. violacea based on Thiele’s annotation (1903). Description of Paratetilla cineriformis based on material from Gulf of Manaar (Sri Lanka). Although the spicules shown by P. cineriformis resembled T. merguiensis, Dendy (1905) argues that the general aspect of the sponge was quite different as porocalices have no specific arrangement and the layer of calthrops was more irregular than in Carter’s species." 1907;Lendenfeld;"The genus Amphytethya was created based on its characteristic amphitriaenes. Many other species under the genus Cinachyra, Fangophilina and Tetilla were described." 1911;Row;"Description of Paratetilla eccentrica from the Red Sea. Cortical triaenes (= calthrop-like) with high modifications, in some cases even becoming into “walking-sticks”." 1912;Hentschel;"Description of Paratetilla aruensis from Aru- and Kei- Islands (Indonesia), with characteristic amphitriaenes. Relocation of the genus Amphitethya Lendenfeld, 1907 as a junior synonym of Paratetilla." 1922;Dendy;"All nominal species with calthrop-like spicules were synonymized to Paratetilla bacca, except for P. aruensis Hentschel, 1912. Two varieties were identified: P. bacca var. violacea based on T. violacea characteristics, and the new variety P. bacca var. corrugata from Diego Garcia in the Indian Ocean." 1925;Wilson;"Description of Paratetilla arcifera from Philippines. Wilson recognized as valid four additional species: P. bacca (Selenka, 1867), P. amboinensis (Kieschnick, 1898), P. cineriformis (Dendy, 1905) and P. eccentrica (Row, 1911). However, he also commented that P. bacca is a comprehensive variable species, as previously proposed by Thiele (1903) and later established by Dendy (1922). Establishment of Cinachyrella genus. Validation of the genus Amphitethya Lendenfeld, 1907." 1954;"de Laubenfels";"Description of Paratetilla lipotriaena from Micronesia (West-Central Pacific), characterized by variable calthrop-like spicules and the absence of triaenes, and relatively similar to P. eccentrica Row, 1911." 1959;Burton;"All nominal species described within the genus Paratetilla were included as synonyms of P. bacca, except for P. lipotriaena." 1987;Rützler;"Review of Family Tetillidae, including seven genera (all except for Fangophilina). Nomination of Paratetilla cineriformis as type species of genus Paratetilla." 1994;"Hooper and Wiedenmayer";"Review of all Paratetilla bacca synonyms based on Burton (1959) taxonomic decision." 2002;"van Soest and Rützler";"Review of the eight genera included within family Tetillidae. Although Paratetilla characters were a combination of two descriptions, a paragraph in the discussion included the size differences between both Selenka’s and Carter’s material (Stelletta bacca and Tethya merguiensis, respectively). The origin of calthrop-like spicules was also discussed as probably modified plagiotriaenes resembling some Cinachyrella species, arguing the possibility of the inclusion of the widespread species Paratetilla bacca within Cinachyrella genus." 2008;"van Soest and Beglinger";"Redescription of Paratetilla corrugata based on material from the Gulf of Oman, and giving validity to the variety P. bacca var. corrugata by Dendy (1922). The presence of trichodragmata is characteristic of this species." 2018;"van Soest et al. (WPD)";"Junior synonyms for Paratetilla bacca (Selenka, 1867): Tetilla bacca (Selenka, 1867), Stelletta bacca bacca Selenka, 1867, Tethya merguiensis Carter, 1883, Stelletta bacca Selenka, 1887, Tetilla violacea Kieschnick, 1896, Tetilla ternatensis Kieschnick, 1896, Tetilla rubra Kieschnick, 1898, Paratetilla cineriformis Dendy, 1905, Paratetilla eccentrica Row, 1911, Paratetilla arcifera Wilson, 1925. Other accepted Paratetilla species in WPD: Paratetilla amboinensis (Kieschnick, 1898), Paratetilla aruensis Hentschel, 1912, Paratetilla corrugata Dendy, 1922, Paratetilla lipotriaena de Laubenfels, 1954." 2018;"This study";"Paratetilla species from Indonesia: Paratetilla bacca (Selenka, 1867), Paratetilla arcifera Wilson, 1925, and Paratetilla corrugata Dendy, 1922 (not observed in our Indonesian material), Paratetilla aruensis Hentschel, 1912 with amphitriaenes, it is suggested to be transferred to Amphitethya."