Tetilla

Fernandez, Julio C. C., Peixinho, Solange, Pinheiro, Ulisses S. & Menegola, Carla, 2011, Three new species of Tetilla Schmidt, 1868 (Tetillidae, Spirophorida, Demospongiae) from Bahia, northeastern Brazil, Zootaxa 2978, pp. 51-67 : 66

Key to the Tetilla species occurring in the Atlantic Ocean

1a. Oxeas present....................................................................................... 2

1b. Oxeas absent; one size of protriaenes and anatriaenes; microscleres absent................................ T. truncata

2a. One category of oxeas.................................................................................. 3

2b. Two or more categories of oxeas.......................................................................... 9

3a. Protriaenes present................................................................................... 4

3b. Protriaenes absent; a single category of oxeas, anatriaenes and sigmaspires............................. T. sigmophora

4a. One category of protriaenes............................................................................. 5

4b. Two categories of protriaenes; sigmaspires centrotylote.............................................. T. geniculata

5a. Regular sigmaspires present............................................................................ 6

5b. Regular Sigmaspires absent............................................................................. 7

6a. Anatriaenes present.................................................................................... 8

6b. Anatrienes absent; oxeas of 2326 / 24 µm; protriaenes with 197 / 5 µm (larger clade) and 51/ 4 µm (smaller clade); sigmaspires 24–28 µm................................................................................... T. sandalina

7a. Oxeas (medium length/ medium thickness): 1.100 µm / 7.6 µm; triaenes (rhabdome / cladome): protriaenes> 3.500 / 49–194 µm; anatriaenes> 5.600 µm/ 29–50................................................................ T. radiata

7b. Oxeas (medium length/ medium thickness): 2.000 µm/ 20 µm; protriaenes not measured; anatriaenes absent.. T. euplocamos

8a. Oxeas less than 1.500 µm; triaenes (rhabdome, cladome length/thickness): protriaenes 1800–2000/ 4 µm, 35–70/ 3 µm; anatri- aenes 2500–3.000/ 5 µm, 30–40 µm; sigmaspires 10 µm............................................ T. pedonculata

8b. Oxeas greater than 3.000 µm; protriaenes 2.000–3.000 µm; sigmaspires 12 µm............................. T. africana

9a. Two categories of oxeas............................................................................... 10

9b. Three categories of oxeas.............................................................................. 13

10a. Three categories of triaenes; sigmaspires present............................................................ 11

10b. Four categories of triaenes (two of protriaenes and two of anatriaenes); sigmaspires absent and oxeas form a halichondroid sec- ondary skeleton......................................................................... T. muricyi sp. nov.

11a. Two categories of protriaenes and one single of anatriaenes................................................... 12

11b. A single category of protriaenes (rhabd. 5.300 µm, larger clade> 140 µm, smaller clades 80–95 µm) and two of anatriaenes (I: rhabd 6.000, larger cladi 225–240/20 µm; II: 1.150 µm, 55–110 µm); sigmaspires 34–40 / 4 µm................. T. nimia

12a. Oxeas I with a maximum length of 5.000 µm; protriaenes I with length up to 2.000 µm and protriaenes II with up to 300 µm; anatriaenes of 5.000–8.000 µm in length by 10–15 µm thick......................................... T. bonaventura

12b. Oxeas I greather than 5.500 µm;; protriaenes I with length greater than 5.000 µm (up to 10.000 µm) and protriaenes II with up to 1.000 µm; anatriaenes of 12.000 µm in length by 35–40 µm thick..................................... T. capillosa

13a. Five categories of triaenes (2 types of protriaenes and three of anatriaenes); one single category of sigmaspires............................................................................................. T. pentatriaena sp. nov.

13b. Three categories of triaenes (2 of protriaenes and one of anatriaenes); sigmaspires absent............ T. rodriguesi sp. nov.